v1.13.1

ADDED:
* ispriv, which returns some information useful for determining if
  running with extra permissions, in sudo, etc.

.gitignore

@@ -29,6 +29,9 @@
 # Test binary, built with `go test -c`
 *.test
 
+# Test file
+fsutils/testfile
+
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
 

TODO

@@ -1,8 +1,9 @@
+- refactor the elevation detection stuff. I'm not terribly happy with it.
+
 - password generator utility/library
+-- incorporate with r00t2.io/pwgen
 -- incorporate with https://github.com/tredoe/osutil ?
--- cli flag to dump flat hashes too
---- https://github.com/hlandau/passlib
--- incoprporated separately; https://git.r00t2.io/r00t2/PWGen (import r00t2.io/pwgen)
+-- cli flag to dump flat hashes too (https://github.com/hlandau/passlib and others soon in pwgen)
 
 - auger needs to be build-constrained to linux.
 

auger/TODO

@@ -0,0 +1 @@
+This module is still under work.

auger/consts.go

@@ -7,3 +7,35 @@ const (
 	augInclTfm      string = "incl"               // The transformer keyword for Augeas includes.
 	augAppendSuffix string = "[last()+1]"
 )
+
+var (
+	dstPtrTrue  bool = true
+	dstPtrFalse bool = false
+)
+
+var (
+	// PtrTrue and PtrFalse are convenience references for constructing an AugFlags if needed. It is recommended you do not change these values if you do not like being confused.
+	PtrTrue  *bool = &dstPtrTrue
+	PtrFalse *bool = &dstPtrFalse
+)
+
+/*
+	IncludeOptNone is the default include recursion option for Aug.RecursiveInclude.
+	* No special behavior is defined
+	* All include directives are assumed to refer:
+		* Explicitly/exclusively to file paths
+		* That must exist
+*/
+const IncludeOptNone includeOpt = 0
+const (
+	// IncludeOptNoExist specifies that inclusions are allowed to not exist, otherwise an error will be raised while attempting to parse them.
+	IncludeOptNoExist includeOpt = 1 << iota
+	// IncludeOptGlobbing indicates that the inclusion system supports globbing (as supported by (github.com/gobwas/glob).Match).
+	IncludeOptGlobbing
+	// IncludeOptRegex indicates that the inclusion system supports matching by regex (as supported by regexp).
+	IncludeOptRegex
+	// IncludeOptDirs indicates that the inclusion system supports matching by directory.
+	IncludeOptDirs
+	// IncludeOptDirsRecursive indicates that the inclusion system also recurses into subdirectories of matched directories. Only used if IncludeOptDirs is also set.
+	IncludeOptDirsRecursive
+)

auger/funcs.go

@@ -6,6 +6,7 @@ import (
 	`strings`
 
 	`honnef.co/go/augeas`
+	`r00t2.io/goutils/bitmask`
 )
 
 /*
@@ -41,12 +42,17 @@ func NewAugerFromAugeas(orig augeas.Augeas) (aug *Aug) {
 }
 
 /*
-	AugpathToFspath returns the filesystem path from an Augeas path.
+	AugpathToFspath returns the filesystem path (i.e. an existing file) from an Augeas path.
 
 	It is *required* and expected that the Augeas standard /files prefix be removed first;
 	if not, it is assumed to be part of the filesystem path.
 
 	If a valid path cannot be determined, fsPath will be empty.
+
+	To be clear, a file must exist for fsPath to not be empty;
+	the way AugpathToFsPath works is it recurses bottom-up a
+	given path and checks for the existence of a file,
+	continuing upwards if not found.
 */
 func AugpathToFspath(augPath string) (fsPath string, err error) {
 
@@ -95,3 +101,11 @@ func dedupePaths(new, existing []string) (missing []string) {
 
 	return
 }
+
+// getInclPaths applies path options to inclusions.
+func getInclPaths(pathSpec string, inclFlags *bitmask.MaskBit) (fpaths []string, err error) {
+
+	// TODO
+
+	return
+}

auger/funcs_aug.go

@@ -12,6 +12,7 @@ import (
 	`github.com/davecgh/go-spew/spew`
 	`github.com/google/shlex`
 	`honnef.co/go/augeas`
+	`r00t2.io/goutils/bitmask`
 	`r00t2.io/sysutils/paths`
 )
 
@@ -146,10 +147,21 @@ breakCmd:
 	An error will be returned if augLens is a nonexistent or not-loaded Augeas lens module.
 
 	Depending on how many files there are and whether globs vs. explicit filepaths are included, this may take a while.
-*/
-func (a *Aug) RecursiveInclude(augLens, includeDirective, fsRoot string) (err error) {
 
-	if err = a.addIncl(includeDirective, augLens, fsRoot, nil); err != nil {
+	optFlags may be nil, multiple includeOpt (see the IncludeOpt* constants) as variadic parameters/expanded slice,
+	bitwise-OR'd together, or multiple non-OR'd and OR'd together (all will be combined to a single value).
+*/
+func (a *Aug) RecursiveInclude(augLens, includeDirective, fsRoot string, optFlags ...includeOpt) (err error) {
+
+	var flags *bitmask.MaskBit = bitmask.NewMaskBit()
+
+	if optFlags != nil && len(optFlags) > 0 {
+		for _, f := range optFlags {
+			flags.AddFlag(f.toMb())
+		}
+	}
+
+	if err = a.addIncl(includeDirective, augLens, fsRoot, nil, flags); err != nil {
 		return
 	}
 
@@ -164,14 +176,16 @@ func (a *Aug) RecursiveInclude(augLens, includeDirective, fsRoot string) (err er
 	newInclPaths are new filesystem paths/Augeas-compatible glob patterns to load into the filetree and recurse into.
 	They may be nil, especially if the first run.
 */
-func (a *Aug) addIncl(includeDirective, augLens string, fsRoot string, newInclPaths []string) (err error) {
+func (a *Aug) addIncl(includeDirective, augLens string, fsRoot string, newInclPaths []string, inclFlags *bitmask.MaskBit) (err error) {
 
 	var matches []string                                   // Passed around set of Augeas matches.
+	var exists bool                                        // Used to indicate if the include path exists.
 	var includes []string                                  // Filepath(s)/glob(s) from fetching includeDirective in lensInclPath. These are internal to the application but are recursed.
 	var lensInclPath string                                // The path of the included paths in the tree. These are internal to Augeas, not the application.
 	var appendPath string                                  // The path for new Augeas includes.
 	var match []string                                     // A placeholder for iterating when populating includes.
 	var fpath string                                       // A placeholder for finding the path of a conf file that contains an includeDirective.
+	var normalizedIncludes []string                        // A temporary slice to hold normalization operations and other dynamic building.
 	var lensPath string = fmt.Sprintf(augLensTpl, augLens) // The path of the lens (augLens) itself.
 	var augErr *augeas.Error = new(augeas.Error)           // We use this to skip "nonexistent" lens.
 
@@ -193,7 +207,7 @@ func (a *Aug) addIncl(includeDirective, augLens string, fsRoot string, newInclPa
 
 	// First canonize paths.
 	if newInclPaths != nil && len(newInclPaths) > 0 {
-		// Existing includes. We don't return on an empty lensInclPath because
+		// Existing includes. We don't return on an empty lensInclPath.
 		if matches, err = a.aug.Match(lensInclPath); err != nil {
 			if errors.As(err, augErr) && augErr.Code == augeas.NoMatch {
 				err = nil
@@ -221,6 +235,17 @@ func (a *Aug) addIncl(includeDirective, augLens string, fsRoot string, newInclPa
 		// We don't want to bother adding multiple incl's for the same path(s); it can negatively affect Augeas loads.
 		newInclPaths = dedupePaths(newInclPaths, matches)
 
+		// And then apply things like recursion, globbing, etc.
+		normalizedIncludes = make([]string, 0, len(newInclPaths))
+		if inclFlags.HasFlag(IncludeOptGlobbing.toMb()) {
+			// TODO
+			/*
+				if strings.Contains(newInclPaths[idx], "*") {
+
+				}
+			*/
+		}
+
 		// Add the new path(s) as Augeas include entries.
 		if newInclPaths != nil {
 			for _, fsPath := range newInclPaths {
@@ -285,10 +310,13 @@ func (a *Aug) addIncl(includeDirective, augLens string, fsRoot string, newInclPa
 	}
 
 	if matches != nil && len(matches) != 0 {
-		if err = a.addIncl(includeDirective, augLens, fsRoot, matches); err != nil {
+		if err = a.addIncl(includeDirective, augLens, fsRoot, matches, inclFlags); err != nil {
 			return
 		}
 	}
 
+	// TODO
+	_, _ = exists, normalizedIncludes
+
 	return
 }

auger/funcs_includeopt.go

@@ -0,0 +1,13 @@
+package auger
+
+import (
+	`r00t2.io/goutils/bitmask`
+)
+
+// toMb returns a bitmask.MaskBit of this includeOpt.
+func (i includeOpt) toMb() (mb bitmask.MaskBit) {
+
+	mb = bitmask.MaskBit(i)
+
+	return
+}

auger/funcs_test.go

@@ -22,3 +22,18 @@ func TestNewAuger(t *testing.T) {
 
 	_ = aug
 }
+
+func TestRecursiveInclude(t *testing.T) {
+
+	var aug *Aug
+	var err error
+
+	if aug, err = NewAuger("/", "", &AugFlags{DryRun: PtrTrue}); err != nil {
+		t.Fatal(err)
+	}
+
+	// This requires Nginx to be installed and with a particularly complex nested include system.
+	if err = aug.RecursiveInclude("Nginx", "include", "/etc/nginx"); err != nil {
+		t.Fatal(err)
+	}
+}

auger/types.go

@@ -2,8 +2,11 @@ package auger
 
 import (
 	`honnef.co/go/augeas`
+	`r00t2.io/goutils/bitmask`
 )
 
+type includeOpt bitmask.MaskBit
+
 // Aug is a wrapper around (honnef.co/go/)augeas.Augeas. Remember to call Aug.Close().
 type Aug struct {
 	aug augeas.Augeas

cryptparse/doc.go

@@ -3,3 +3,4 @@
 
 	It is now its own module: r00t2.io/cryptparse
 */
+package cryptparse

envs/funcs.go

@@ -159,7 +159,7 @@ func GetPidEnvMap(pid uint32) (envMap map[string]string, err error) {
 	var procPath string
 	var exists bool
 
-	envMap = make(map[string]string, 0)
+	envMap = make(map[string]string)
 
 	procPath = fmt.Sprintf("/proc/%v/environ", pid)
 

envs/utils.go

@@ -13,7 +13,7 @@ func envListToMap(envs []string) (envMap map[string]string) {
 	var kv []string
 	var k, v string
 
-	envMap = make(map[string]string, 0)
+	envMap = make(map[string]string)
 
 	for _, ev := range envs {
 		kv = strings.SplitN(ev, "=", 2)

fsutils/TODO

@@ -0,0 +1,3 @@
+- XATTRS
+(see FS_XFLAG_* in fs.h, FS_IOC_FSGETXATTR/FS_IOC_FSSETXATTR)
+- fs label, UUID? (fs.h)

fsutils/consts.go

@@ -1,101 +1,36 @@
 package fsutils
 
-import (
-	`github.com/g0rbe/go-chattr`
-)
-
-// https://github.com/torvalds/linux/blob/master/include/uapi/linux/fs.h
-const (
-	SecureDelete       uint32 = chattr.FS_SECRM_FL        // Secure deletion
-	UnDelete                  = chattr.FS_UNRM_FL         // Undelete
-	CompressFile              = chattr.FS_COMPR_FL        // Compress file
-	SyncUpdatechattr          = chattr.FS_SYNC_FL         // Synchronous updates
-	Immutable                 = chattr.FS_IMMUTABLE_FL    // Immutable file
-	AppendOnly                = chattr.FS_APPEND_FL       // Writes to file may only append
-	NoDumpFile                = chattr.FS_NODUMP_FL       // Do not dump file
-	NoUpdateAtime             = chattr.FS_NOATIME_FL      // Do not update atime
-	IsDirty                   = chattr.FS_DIRTY_FL        // Nobody knows what this does, lol.
-	CompressedClusters        = chattr.FS_COMPRBLK_FL     // One or more compressed clusters
-	NoCompress                = chattr.FS_NOCOMP_FL       // Don't compress
-	EncFile                   = chattr.FS_ENCRYPT_FL      // Encrypted file
-	BtreeFmt                  = chattr.FS_BTREE_FL        // Btree format dir
-	HashIdxDir                = chattr.FS_INDEX_FL        // Hash-indexed directory
-	AfsDir                    = chattr.FS_IMAGIC_FL       // AFS directory
-	ReservedExt3              = chattr.FS_JOURNAL_DATA_FL // Reserved for ext3
-	NoMergeTail               = chattr.FS_NOTAIL_FL       // File tail should not be merged
-	DirSync                   = chattr.FS_DIRSYNC_FL      // dirsync behaviour (directories only)
-	DirTop                    = chattr.FS_TOPDIR_FL       // Top of directory hierarchies
-	ReservedExt4a             = chattr.FS_HUGE_FILE_FL    // Reserved for ext4
-	Extents                   = chattr.FS_EXTENT_FL       // Extents
-	LargeEaInode              = chattr.FS_EA_INODE_FL     // Inode used for large EA
-	ReservedExt4b             = chattr.FS_EOFBLOCKS_FL    // Reserved for ext4
-	NoCOWFile                 = chattr.FS_NOCOW_FL        // Do not cow file
-	ReservedExt4c             = chattr.FS_INLINE_DATA_FL  // Reserved for ext4
-	UseParentProjId           = chattr.FS_PROJINHERIT_FL  // Create with parents projid
-	ReservedExt2              = chattr.FS_RESERVED_FL     // Reserved for ext2 lib
-)
-
 var (
-	// AttrNameValueMap contains a mapping of attribute names (as designated by this package) to their flag values.
-	AttrNameValueMap map[string]uint32 = map[string]uint32{
-		"SecureDelete":       SecureDelete,
-		"UnDelete":           UnDelete,
-		"CompressFile":       CompressFile,
-		"SyncUpdatechattr":   SyncUpdatechattr,
-		"Immutable":          Immutable,
-		"AppendOnly":         AppendOnly,
-		"NoDumpFile":         NoDumpFile,
-		"NoUpdateAtime":      NoUpdateAtime,
-		"IsDirty":            IsDirty,
-		"CompressedClusters": CompressedClusters,
-		"NoCompress":         NoCompress,
-		"EncFile":            EncFile,
-		"BtreeFmt":           BtreeFmt,
-		"HashIdxDir":         HashIdxDir,
-		"AfsDir":             AfsDir,
-		"ReservedExt3":       ReservedExt3,
-		"NoMergeTail":        NoMergeTail,
-		"DirSync":            DirSync,
-		"DirTop":             DirTop,
-		"ReservedExt4a":      ReservedExt4a,
-		"Extents":            Extents,
-		"LargeEaInode":       LargeEaInode,
-		"ReservedExt4b":      ReservedExt4b,
-		"NoCOWFile":          NoCOWFile,
-		"ReservedExt4c":      ReservedExt4c,
-		"UseParentProjId":    UseParentProjId,
-		"ReservedExt2":       ReservedExt2,
-	}
 	/*
-		AttrValueNameMap contains a mapping of attribute flags to their names (as designated by this package).
-		Note the oddball here, BtreeFmt and HashIdxDir are actually the same value, so be forewarned.
+		linuxFsAttrsListOrder defines the order the attributes are printed in per e2fsprogs.
+
+		See flags_name at https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git/tree/lib/e2p/pf.c for order.
+		Up to date as of e2fsprogs v1.47.1, Linux 6.12-rc7.
+
+		The below are the struct field names for easier reflection.
 	*/
-	AttrValueNameMap map[uint32]string = map[uint32]string{
-		SecureDelete:       "SecureDelete",
-		UnDelete:           "UnDelete",
-		CompressFile:       "CompressFile",
-		SyncUpdatechattr:   "SyncUpdatechattr",
-		Immutable:          "Immutable",
-		AppendOnly:         "AppendOnly",
-		NoDumpFile:         "NoDumpFile",
-		NoUpdateAtime:      "NoUpdateAtime",
-		IsDirty:            "IsDirty",
-		CompressedClusters: "CompressedClusters",
-		NoCompress:         "NoCompress",
-		EncFile:            "EncFile",
-		BtreeFmt:           "BtreeFmt|HashIdxDir", // Well THIS is silly and seems like an oversight. Both FS_BTREE_FL and FS_INDEX_FL have the same flag. Confirmed in kernel source.
-		AfsDir:             "AfsDir",
-		ReservedExt3:       "ReservedExt3",
-		NoMergeTail:        "NoMergeTail",
-		DirSync:            "DirSync",
-		DirTop:             "DirTop",
-		ReservedExt4a:      "ReservedExt4a",
-		Extents:            "Extents",
-		LargeEaInode:       "LargeEaInode",
-		ReservedExt4b:      "ReservedExt4b",
-		NoCOWFile:          "NoCOWFile",
-		ReservedExt4c:      "ReservedExt4c",
-		UseParentProjId:    "UseParentProjId",
-		ReservedExt2:       "ReservedExt2",
+	linuxFsAttrsListOrder []string = []string{
+		"SecureDelete",
+		"UnDelete",
+		"SyncUpdate",
+		"DirSync",
+		"Immutable",
+		"AppendOnly",
+		"NoDumpFile",
+		"NoUpdateAtime",
+		"CompressFile",
+		"EncFile",
+		"ReservedExt3",
+		"HashIdxDir",
+		"NoMergeTail",
+		"DirTop",
+		"Extents",
+		"NoCOWFile",
+		"DAX",
+		"CaseInsensitive",
+		"ReservedExt4c",
+		"UseParentProjId",
+		"VerityProtected",
+		"NoCompress",
 	}
 )

fsutils/consts_lin.go

@@ -0,0 +1,127 @@
+package fsutils
+
+/*
+	https://github.com/torvalds/linux/blob/master/include/uapi/linux/fs.h "Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)"
+	Up to date as of Linux 6.12-rc7.
+*/
+const (
+	SecureDelete       fsAttr = 1 << iota // Secure deletion
+	UnDelete                              // Undelete
+	CompressFile                          // Compress file
+	SyncUpdate                            // Synchronous updates
+	Immutable                             // Immutable file
+	AppendOnly                            // Writes to file may only append
+	NoDumpFile                            // Do not dump file
+	NoUpdateAtime                         // Do not update atime
+	IsDirty                               // Nobody knows what this does, lol.
+	CompressedClusters                    // One or more compressed clusters
+	NoCompress                            // Don't compress
+	EncFile                               // Encrypted file
+	BtreeFmt                              // Btree format dir
+	AfsDir                                // AFS directory
+	ReservedExt3                          // Reserved for ext3
+	NoMergeTail                           // File tail should not be merged
+	DirSync                               // dirsync behaviour (directories only)
+	DirTop                                // Top of directory hierarchies
+	ReservedExt4a                         // Reserved for ext4
+	Extents                               // Extents
+	VerityProtected                       // Verity-protected inode
+	LargeEaInode                          // Inode used for large EA
+	ReservedExt4b                         // Reserved for ext4
+	NoCOWFile                             // Do not cow file
+	_                                     // (Unused)
+	DAX                                   // Inode is DAX
+	_                                     // (Unused)
+	_                                     // (Unused)
+	ReservedExt4c                         // Reserved for ext4
+	UseParentProjId                       // Create with parents projid
+	CaseInsensitive                       // Folder is case-insensitive
+	ReservedExt2                          // Reserved for ext2 lib
+)
+
+// These are the same value. For some reason.
+const (
+	HashIdxDir fsAttr = BtreeFmt // Hash-indexed directory
+)
+
+var (
+	// AttrNameValueMap contains a mapping of attribute names (as designated by this package) to their flag values.
+	AttrNameValueMap map[string]fsAttr = map[string]fsAttr{
+		"SecureDelete":       SecureDelete,
+		"UnDelete":           UnDelete,
+		"CompressFile":       CompressFile,
+		"SyncUpdate":         SyncUpdate,
+		"Immutable":          Immutable,
+		"AppendOnly":         AppendOnly,
+		"NoDumpFile":         NoDumpFile,
+		"NoUpdateAtime":      NoUpdateAtime,
+		"IsDirty":            IsDirty,
+		"CompressedClusters": CompressedClusters,
+		"NoCompress":         NoCompress,
+		"EncFile":            EncFile,
+		"BtreeFmt":           BtreeFmt,
+		"HashIdxDir":         HashIdxDir,
+		"AfsDir":             AfsDir,
+		"ReservedExt3":       ReservedExt3,
+		"NoMergeTail":        NoMergeTail,
+		"DirSync":            DirSync,
+		"DirTop":             DirTop,
+		"ReservedExt4a":      ReservedExt4a,
+		"Extents":            Extents,
+		"VerityProtected":    VerityProtected,
+		"LargeEaInode":       LargeEaInode,
+		"ReservedExt4b":      ReservedExt4b,
+		"NoCOWFile":          NoCOWFile,
+		"DAX":                DAX,
+		"ReservedExt4c":      ReservedExt4c,
+		"UseParentProjId":    UseParentProjId,
+		"CaseInsensitive":    CaseInsensitive,
+		"ReservedExt2":       ReservedExt2,
+	}
+
+	/*
+		AttrValueNameMap contains a mapping of attribute flags to their names (as designated by this package).
+		Note the oddball here, BtreeFmt and HashIdxDir are actually the same value, so their string value is unpredictable.
+	*/
+	AttrValueNameMap map[fsAttr]string = invertMap(AttrNameValueMap)
+
+	// KernelNameValueMap allows lookups using the symbol name as used in the Linux kernel source.
+	KernelNameValueMap map[string]fsAttr = map[string]fsAttr{
+		"FS_SECRM_FL":        SecureDelete,
+		"FS_UNRM_FL":         UnDelete,
+		"FS_COMPR_FL":        CompressFile,
+		"FS_SYNC_FL":         SyncUpdate,
+		"FS_IMMUTABLE_FL":    Immutable,
+		"FS_APPEND_FL":       AppendOnly,
+		"FS_NODUMP_FL":       NoDumpFile,
+		"FS_NOATIME_FL":      NoUpdateAtime,
+		"FS_DIRTY_FL":        IsDirty,
+		"FS_COMPRBLK_FL":     CompressedClusters,
+		"FS_NOCOMP_FL":       NoCompress,
+		"FS_ENCRYPT_FL":      EncFile,
+		"FS_BTREE_FL":        BtreeFmt,
+		"FS_INDEX_FL":        HashIdxDir,
+		"FS_IMAGIC_FL":       AfsDir,
+		"FS_JOURNAL_DATA_FL": ReservedExt3,
+		"FS_NOTAIL_FL":       NoMergeTail,
+		"FS_DIRSYNC_FL":      DirSync,
+		"FS_TOPDIR_FL":       DirTop,
+		"FS_HUGE_FILE_FL":    ReservedExt4a,
+		"FS_EXTENT_FL":       Extents,
+		"FS_VERITY_FL":       VerityProtected,
+		"FS_EA_INODE_FL":     LargeEaInode,
+		"FS_EOFBLOCKS_FL":    ReservedExt4b,
+		"FS_NOCOW_FL":        NoCOWFile,
+		"FS_DAX_FL":          DAX,
+		"FS_INLINE_DATA_FL":  ReservedExt4c,
+		"FS_PROJINHERIT_FL":  UseParentProjId,
+		"FS_CASEFOLD_FL":     CaseInsensitive,
+		"FS_RESERVED_FL":     ReservedExt2,
+	}
+
+	/*
+		KernelValueNameMap contains a mapping of attribute flags to their kernel source symbol name.
+		Note the oddball here, BtreeFmt and HashIdxDir are actually the same value, so their string value is unpredictable.
+	*/
+	KernelValueNameMap map[fsAttr]string = invertMap(KernelNameValueMap)
+)

fsutils/doc.go

@@ -0,0 +1,7 @@
+/*
+	fsutils is a collection of filesystem-related functions, types, etc.
+
+	Currently it's only a (fixed/actually working) reimplementation of github.com/g0rbe/go-chattr.
+	(Note to library maintainers, if someone reports an integer overflow and even tells you how to fix it, you should probably fix it.)
+*/
+package fsutils

fsutils/errs.go

@@ -0,0 +1,11 @@
+package fsutils
+
+import (
+	`syscall`
+)
+
+var (
+	// Yes, I know. "Why ENOTTY?" I don't know, ask Linus.
+	// If you see "inappropriate ioctl for device", it's this'un.
+	ErrFsAttrsUnsupported error = syscall.ENOTTY
+)

fsutils/funcs.go

@@ -1,44 +1,16 @@
 package fsutils
 
-import (
-	`os`
-	`reflect`
+// invertMap returns some handy consts remapping for easier lookups.
+func invertMap(origMap map[string]fsAttr) (newMap map[fsAttr]string) {
 
-	`github.com/g0rbe/go-chattr`
-	`r00t2.io/sysutils/paths`
-)
-
-func GetAttrs(path string) (attrs *FsAttrs, err error) {
-
-	var f *os.File
-	var evalAttrs FsAttrs
-	var attrVal uint32
-	var reflectVal reflect.Value
-	var field reflect.Value
-	var myPath string = path
-
-	if err = paths.RealPath(&myPath); err != nil {
+	if origMap == nil {
 		return
 	}
+	newMap = make(map[fsAttr]string)
 
-	if f, err = os.Open(myPath); err != nil {
-		return
+	for k, v := range origMap {
+		newMap[v] = k
 	}
-	defer f.Close()
-
-	reflectVal = reflect.ValueOf(&evalAttrs).Elem()
-
-	if attrVal, err = chattr.GetAttrs(f); err != nil {
-		return
-	}
-
-	for attrNm, attrInt := range AttrNameValueMap {
-		field = reflectVal.FieldByName(attrNm)
-		field.SetBool((attrVal & attrInt) != 0)
-	}
-
-	attrs = new(FsAttrs)
-	*attrs = evalAttrs
 
 	return
 }

fsutils/funcs_fsattrs.go

@@ -1,43 +1,96 @@
 package fsutils
 
 import (
-	`os`
 	`reflect`
-
-	`github.com/g0rbe/go-chattr`
-	`r00t2.io/sysutils/paths`
+	`strings`
 )
 
-func (f *FsAttrs) Apply(path string) (err error) {
+/*
+	String returns a string representation (comparable to lsattr(1)) of an FsAttrs.
 
-	var file *os.File
-	var reflectVal reflect.Value
+	Not all flags are represented, as this aims for compatibility with e2fsprogs/lsattr output.
+*/
+func (f *FsAttrs) String() (s string) {
+
+	// Flags have their short name printed if set, otherwise a '-' placeholder is used.
+	// https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git/tree/lib/e2p/pf.c
+
+	var refType reflect.Type
+	var refVal reflect.Value
+	var refField reflect.StructField
 	var fieldVal reflect.Value
+	var tagVal string
+	var sb strings.Builder
 
-	var myPath string = path
-
-	if err = paths.RealPath(&myPath); err != nil {
+	if f == nil {
+		s = strings.Repeat("-", len(linuxFsAttrsListOrder))
 		return
 	}
-	if file, err = os.Open(myPath); err != nil {
-		return
-	}
-	defer file.Close()
 
-	reflectVal = reflect.ValueOf(*f)
-
-	for attrNm, attrVal := range AttrNameValueMap {
-		fieldVal = reflectVal.FieldByName(attrNm)
+	refVal = reflect.ValueOf(*f)
+	refType = refVal.Type()
+	for _, fn := range linuxFsAttrsListOrder {
+		refField, _ = refType.FieldByName(fn)
+		tagVal = refField.Tag.Get("fsAttrShort")
+		if tagVal == "" || tagVal == "-" {
+			continue
+		}
+		fieldVal = refVal.FieldByName(fn)
 		if fieldVal.Bool() {
-			if err = chattr.SetAttr(file, attrVal); err != nil {
-				return
-			}
+			sb.WriteString(tagVal)
 		} else {
-			if err = chattr.UnsetAttr(file, attrVal); err != nil {
-				return
-			}
+			sb.WriteString("-")
 		}
 	}
 
+	s = sb.String()
+
+	return
+}
+
+/*
+	StringLong returns a more extensive/"human-friendly" representation (comparable to lsattr(1) wiih -l) of an Fsattrs.
+
+	Not all flags are represented, as this aims for compatibility with e2fsprogs/lsattr output.
+*/
+func (f *FsAttrs) StringLong() (s string) {
+
+	// The long names are separated via a commma then a space.
+	// If no attrs are set, the string "---" is used.
+	// https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git/tree/lib/e2p/pf.c
+
+	var refType reflect.Type
+	var refVal reflect.Value
+	var refField reflect.StructField
+	var fieldVal reflect.Value
+	var tagVal string
+	var out []string
+
+	if f == nil {
+		s = strings.Repeat("-", 3)
+		return
+	}
+
+	refVal = reflect.ValueOf(*f)
+	refType = refVal.Type()
+	for _, fn := range linuxFsAttrsListOrder {
+		refField, _ = refType.FieldByName(fn)
+		tagVal = refField.Tag.Get("fsAttrLong")
+		if tagVal == "" || tagVal == "-" {
+			continue
+		}
+		fieldVal = refVal.FieldByName(fn)
+		if fieldVal.Bool() {
+			out = append(out, tagVal)
+		}
+	}
+
+	if out == nil || len(out) == 0 {
+		s = strings.Repeat("-", 3)
+		return
+	}
+
+	s = strings.Join(out, ", ")
+
 	return
 }

fsutils/funcs_fsattrs_linux.go

@@ -0,0 +1,46 @@
+//go:build linux
+
+package fsutils
+
+import (
+	`os`
+	`reflect`
+
+	`r00t2.io/sysutils/paths`
+)
+
+func (f *FsAttrs) Apply(path string) (err error) {
+
+	var file *os.File
+	var reflectVal reflect.Value
+	var fieldVal reflect.Value
+
+	if f == nil {
+		return
+	}
+
+	if err = paths.RealPath(&path); err != nil {
+		return
+	}
+	if file, err = os.Open(path); err != nil {
+		return
+	}
+	defer file.Close()
+
+	reflectVal = reflect.ValueOf(*f)
+
+	for attrNm, attrVal := range AttrNameValueMap {
+		fieldVal = reflectVal.FieldByName(attrNm)
+		if fieldVal.Bool() {
+			if err = setAttrs(file, attrVal); err != nil {
+				return
+			}
+		} else {
+			if err = unsetAttrs(file, attrVal); err != nil {
+				return
+			}
+		}
+	}
+
+	return
+}

fsutils/funcs_linux.go

@@ -0,0 +1,134 @@
+//go:build linux
+
+package fsutils
+
+import (
+	`os`
+	`reflect`
+	`unsafe`
+
+	`golang.org/x/sys/unix`
+	`r00t2.io/goutils/bitmask`
+	`r00t2.io/sysutils/paths`
+)
+
+func GetAttrs(path string) (attrs *FsAttrs, err error) {
+
+	var f *os.File
+	var evalAttrs FsAttrs
+	var attrVal fsAttr
+	var attrValBit bitmask.MaskBit
+	var reflectVal reflect.Value
+	var field reflect.Value
+	var myPath string = path
+
+	if err = paths.RealPath(&myPath); err != nil {
+		return
+	}
+
+	if f, err = os.Open(myPath); err != nil {
+		return
+	}
+	defer f.Close()
+
+	reflectVal = reflect.ValueOf(&evalAttrs).Elem()
+
+	if attrVal, err = getAttrs(f); err != nil {
+		return
+	}
+	attrValBit = bitmask.MaskBit(attrVal)
+
+	for attrNm, attrInt := range AttrNameValueMap {
+		field = reflectVal.FieldByName(attrNm)
+		field.SetBool(attrValBit.HasFlag(bitmask.MaskBit(attrInt)))
+	}
+
+	attrs = new(FsAttrs)
+	*attrs = evalAttrs
+
+	return
+}
+
+// getAttrs is the unexported low-level syscall to get attributes.
+func getAttrs(f *os.File) (attrVal fsAttr, err error) {
+
+	var u uint
+	var curFlags int
+	// var errNo syscall.Errno
+
+	/*
+		if _, _, errNo = unix.Syscall(unix.SYS_IOCTL, f.Fd(), unix.FS_IOC_GETFLAGS, uintptr(unsafe.Pointer(&curFlags))); errNo != 0 {
+			err = os.NewSyscallError("ioctl: FS_IOC_GETFLAGS", errNo)
+			return
+		}
+	*/
+	if curFlags, err = unix.IoctlGetInt(int(f.Fd()), unix.FS_IOC_GETFLAGS); err != nil {
+		return
+	}
+
+	u = uint(curFlags)
+
+	attrVal = fsAttr(u)
+
+	return
+}
+
+// setAttrs is the unexported low-level syscall to set attributes. attrs may be OR'd.
+func setAttrs(f *os.File, attrs fsAttr) (err error) {
+
+	var curAttrs fsAttr
+	var ab bitmask.MaskBit
+	var errNo unix.Errno
+	var val uint
+
+	if curAttrs, err = getAttrs(f); err != nil {
+		return
+	}
+	ab = bitmask.MaskBit(curAttrs)
+
+	if ab.HasFlag(bitmask.MaskBit(attrs)) {
+		return
+	}
+
+	ab.AddFlag(bitmask.MaskBit(attrs))
+
+	val = ab.Value()
+
+	/*
+		if err = unix.IoctlSetInt(int(f.Fd()), unix.FS_IOC_SETFLAGS, int(ab.Value())); err != nil {
+			return
+		}
+	*/
+	if _, _, errNo = unix.Syscall(unix.SYS_IOCTL, f.Fd(), unix.FS_IOC_SETFLAGS, uintptr(unsafe.Pointer(&val))); errNo != 0 {
+		err = os.NewSyscallError("ioctl: SYS_IOCTL", errNo)
+		return
+	}
+
+	return
+}
+
+// unsetAttrs is the unexported low-level syscall to remove attributes. attrs may be OR'd.
+func unsetAttrs(f *os.File, attrs fsAttr) (err error) {
+
+	var curAttrs fsAttr
+	var ab bitmask.MaskBit
+
+	if curAttrs, err = getAttrs(f); err != nil {
+		return
+	}
+	ab = bitmask.MaskBit(curAttrs)
+
+	if !ab.HasFlag(bitmask.MaskBit(attrs)) {
+		return
+	}
+
+	ab.ClearFlag(bitmask.MaskBit(attrs))
+
+	/*
+		if err = unix.IoctlSetInt(int(f.Fd()), unix.FS_IOC_SETFLAGS, int(ab.Value())); err != nil {
+			return
+		}
+	*/
+
+	return
+}

fsutils/funcs_linux_test.go

@@ -1,3 +1,5 @@
+//go:build linux
+
 package fsutils
 
 import (
@@ -7,12 +9,13 @@ import (
 	`os/user`
 	`testing`
 
+	`github.com/davecgh/go-spew/spew`
 	`r00t2.io/sysutils/paths`
 )
 
 var (
 	testFilename   string = "testfile"
-	testErrBadUser error  = errors.New("test must be run as root, on Linux")
+	testErrBadUser error  = errors.New("test must be run as root")
 )
 
 func testChkUser() (err error) {
@@ -36,12 +39,18 @@ func TestSetAttrs(t *testing.T) {
 	if attrs, err = GetAttrs(testFilename); err != nil {
 		t.Fatalf("Failed to get attrs for %v: %v", testFilename, err)
 	}
-	t.Logf("Attrs for %v:\n%#v", testFilename, attrs)
+	t.Logf("Attrs for %v (before):\n%s", testFilename, spew.Sdump(attrs))
 	attrs.CompressFile = true
+	attrs.SyncUpdate = true
+	attrs.SecureDelete = true
 	if err = attrs.Apply(testFilename); err != nil {
 		t.Fatalf("Failed to apply attrs to %v: %v", testFilename, err)
 	}
 	t.Logf("Applied new attrs to %v:\n%#v", testFilename, attrs)
+	if attrs, err = GetAttrs(testFilename); err != nil {
+		t.Fatalf("Failed to get attrs for %v: %v", testFilename, err)
+	}
+	t.Logf("Attrs for %v (after):\n%s", testFilename, spew.Sdump(attrs))
 }
 
 func TestMain(t *testing.M) {

fsutils/types.go

@@ -1,32 +1,44 @@
 package fsutils
 
-// FsAttrs is a convenience struct around github.com/g0rbe/go-chattr.
+import (
+	`r00t2.io/goutils/bitmask`
+)
+
+type fsAttr bitmask.MaskBit
+
+/*
+	FsAttrs is a struct representation of filesystem attributes on Linux.
+	Up to date as of Linux 6.12-rc7.
+*/
 type FsAttrs struct {
-	SecureDelete       bool
-	UnDelete           bool
-	CompressFile       bool
-	SyncUpdatechattr   bool
-	Immutable          bool
-	AppendOnly         bool
-	NoDumpFile         bool
-	NoUpdateAtime      bool
-	IsDirty            bool
-	CompressedClusters bool
-	NoCompress         bool
-	EncFile            bool
-	BtreeFmt           bool
-	HashIdxDir         bool
-	AfsDir             bool
-	ReservedExt3       bool
-	NoMergeTail        bool
-	DirSync            bool
-	DirTop             bool
-	ReservedExt4a      bool
-	Extents            bool
-	LargeEaInode       bool
-	ReservedExt4b      bool
-	NoCOWFile          bool
-	ReservedExt4c      bool
-	UseParentProjId    bool
-	ReservedExt2       bool
+	SecureDelete       bool `fsAttrShort:"s" fsAttrLong:"Secure_Deletion" fsAttrKern:"FS_SECRM_FL" json:"secure_delete" toml:"SecureDelete" yaml:"Secure Delete" xml:"secureDelete,attr"`
+	UnDelete           bool `fsAttrShort:"u" fsAttrLong:"Undelete" fsAttrKern:"FS_UNRM_FL" json:"undelete" toml:"Undelete" yaml:"Undelete" xml:"undelete,attr"`
+	CompressFile       bool `fsAttrShort:"c" fsAttrLong:"Compression_Requested" fsAttrKern:"FS_COMPR_FL" json:"compress" toml:"Compress" yaml:"Compress" xml:"compress,attr"`
+	SyncUpdate         bool `fsAttrShort:"S" fsAttrLong:"Synchronous_Updates" fsAttrKern:"FS_SYNC_FL" json:"sync" toml:"SyncUpdate" yaml:"Synchronized Update" xml:"syncUpdate,attr"`
+	Immutable          bool `fsAttrShort:"i" fsAttrLong:"Immutable" fsAttrKern:"FS_IMMUTABLE_FL" json:"immutable" toml:"Immutable" yaml:"Immutable" xml:"immutable,attr"`
+	AppendOnly         bool `fsAttrShort:"a" fsAttrLong:"Append_Only" fsAttrKern:"FS_APPEND_FL" json:"append_only" toml:"AppendOnly" yaml:"Append Only" xml:"appendOnly,attr"`
+	NoDumpFile         bool `fsAttrShort:"d" fsAttrLong:"No_Dump" fsAttrKern:"FS_NODUMP_FL" json:"no_dump" toml:"NoDump" yaml:"Disable Dumping" xml:"noDump,attr"`
+	NoUpdateAtime      bool `fsAttrShort:"A" fsAttrLong:"No_Atime" fsAttrKern:"FS_NOATIME_FL" json:"no_atime" toml:"DisableAtime" yaml:"Disable Atime Updating" xml:"noAtime,attr"`
+	IsDirty            bool `fsAttrShort:"-" fsAttrLong:"-" fsAttrKern:"FS_DIRTY_FL" json:"dirty" toml:"Dirty" yaml:"Dirty" xml:"dirty,attr"`
+	CompressedClusters bool `fsAttrShort:"-" fsAttrLong:"-" fsAttrKern:"FS_COMPRBLK_FL" json:"compress_clst" toml:"CompressedClusters" yaml:"Compressed Clusters" xml:"compressClst,attr"`
+	NoCompress         bool `fsAttrShort:"m" fsAttrLong:"Dont_Compress" fsAttrKern:"FS_NOCOMP_FL" json:"no_compress" toml:"DisableCompression" yaml:"Disable Compression" xml:"noCompress,attr"`
+	EncFile            bool `fsAttrShort:"E" fsAttrLong:"Encrypted" fsAttrKern:"FS_ENCRYPT_FL" json:"enc" toml:"Encrypted" yaml:"Encrypted" xml:"enc,attr"`
+	BtreeFmt           bool `fsAttrShort:"-" fsAttrLong:"-" fsAttrKern:"FS_BTREE_FL" json:"btree" toml:"Btree" yaml:"Btree" xml:"btree,attr"`
+	HashIdxDir         bool `fsAttrShort:"I" fsAttrLong:"Indexed_directory" fsAttrKern:"FS_INDEX_FL" json:"idx_dir" toml:"IdxDir" yaml:"Indexed Directory" xml:"idxDir,attr"`
+	AfsDir             bool `fsAttrShort:"-" fsAttrLong:"-" fsAttrKern:"FS_IMAGIC_FL" json:"afs" toml:"AFS" yaml:"AFS" xml:"afs,attr"`
+	ReservedExt3       bool `fsAttrShort:"j" fsAttrLong:"Journaled_Data" fsAttrKern:"FS_JOURNAL_DATA_FL" json:"res_ext3" toml:"ReservedExt3" yaml:"Reserved Ext3" xml:"resExt3,attr"`
+	NoMergeTail        bool `fsAttrShort:"t" fsAttrLong:"No_Tailmerging" fsAttrKern:"FS_NOTAIL_FL" json:"no_merge_tail" toml:"DisableTailmerging" yaml:"Disable Tailmerging" xml:"noMergeTail,attr"`
+	DirSync            bool `fsAttrShort:"D" fsAttrLong:"Synchronous_Directory_Updates" fsAttrKern:"FS_DIRSYNC_FL" json:"dir_sync" toml:"DirSync" yaml:"Synchronized Directory Updates" xml:"dirSync,attr"`
+	DirTop             bool `fsAttrShort:"T" fsAttrLong:"Top_of_Directory_Hierarchies" fsAttrKern:"FS_TOPDIR_FL" json:"dir_top" toml:"DirTop" yaml:"Top of Directory Hierarchies" xml:"dirTop,attr"`
+	ReservedExt4a      bool `fsAttrShort:"-" fsAttrLong:"-" fsAttrKern:"FS_HUGE_FILE_FL" json:"res_ext4a" toml:"ReservedExt4A" yaml:"Reserved Ext4 A" xml:"resExt4a,attr"`
+	Extents            bool `fsAttrShort:"e" fsAttrLong:"Extents" fsAttrKern:"FS_EXTENT_FL" json:"extents" toml:"Extents" yaml:"Extents" xml:"extents,attr"`
+	VerityProtected    bool `fsAttrShort:"V" fsAttrLong:"Verity" fsAttrKern:"FS_VERITY_FL" json:"verity" toml:"Verity" yaml:"Verity Protected" xml:"verity,attr"`
+	LargeEaInode       bool `fsAttrShort:"-" fsAttrLong:"-" fsAttrKern:"FS_EA_INODE_FL" json:"ea" toml:"EAInode" yaml:"EA Inode" xml:"ea,attr"`
+	ReservedExt4b      bool `fsAttrShort:"-" fsAttrLong:"-" fsAttrKern:"FS_EOFBLOCKS_FL" json:"res_ext4b" toml:"ReservedExt4B" yaml:"Reserved Ext4 B" xml:"resExt4b,attr"`
+	NoCOWFile          bool `fsAttrShort:"C" fsAttrLong:"No_COW" fsAttrKern:"FS_NOCOW_FL" json:"no_cow" toml:"NoCOW" yaml:"Disable COW" xml:"noCOW,attr"`
+	DAX                bool `fsAttrShort:"x" fsAttrLong:"DAX" fsAttrKern:"FS_DAX_FL" json:"dax" toml:"DAX" yaml:"DAX" xml:"DAX,attr"`
+	ReservedExt4c      bool `fsAttrShort:"N" fsAttrLong:"Inline_Data" fsAttrKern:"FS_INLINE_DATA_FL" json:"res_ext4c" toml:"ReservedExt4C" yaml:"Reserved Ext4 C" xml:"resExt4c,attr"`
+	UseParentProjId    bool `fsAttrShort:"P" fsAttrLong:"Project_Hierarchy" fsAttrKern:"FS_PROJINHERIT_FL" json:"parent_proj_id" toml:"ParentProjId" yaml:"Use Parent Project ID" xml:"parentProjId,attr"`
+	CaseInsensitive    bool `fsAttrShort:"F" fsAttrLong:"Casefold" fsAttrKern:"FS_CASEFOLD_FL" json:"case_ins" toml:"CaseInsensitive" yaml:"Case Insensitive" xml:"caseIns,attr"`
+	ReservedExt2       bool `fsAttrShort:"-" fsAttrLong:"-" fsAttrKern:"FS_RESERVED_FL" json:"res_ext2" toml:"ReservedExt2" yaml:"Reserved Ext2" xml:"resExt2,attr"`
 }

funcs_idstate.go

@@ -0,0 +1,163 @@
+package sysutils
+
+// Checked consolidates all the provided checked functions.
+func (i *IDState) Checked() (checked bool) {
+
+	if i == nil {
+		return
+	}
+
+	checked = i.uidsChecked &&
+		i.gidsChecked &&
+		i.sudoChecked &&
+		i.ppidUidChecked &&
+		i.ppidGidChecked
+
+	return
+}
+
+/*
+IsReal consolidates all the elevation/dropped-privs checks into a single method.
+
+It will only return true if no sudo was detected and *all* UIDs/GIDs match.
+*/
+func (i *IDState) IsReal(real bool) {
+
+	if i == nil {
+		return
+	}
+
+	real = true
+
+	for _, b := range []bool{
+		i.IsSuid(),
+		i.IsSgid(),
+		i.IsSudoUser(),
+		i.IsSudoGroup(),
+	} {
+		if b {
+			real = false
+			return
+		}
+	}
+
+	return
+}
+
+/*
+IsSudoGroup is true if any of the group sudo env vars are set,
+or the parent process has a different group (and is not PID 1).
+
+It will always return false if SudoChecked returns false oor PPIDGIDsChecked returns false.
+*/
+func (i *IDState) IsSudoGroup() (sudo bool) {
+
+	if i == nil || !i.sudoChecked || !i.ppidGidChecked {
+		return
+	}
+
+	sudo = i.SudoEnvGroup || !i.PPIDGidMatch
+
+	return
+}
+
+/*
+IsSudoUser is true if any of the user sudo env vars are set,
+or the parent process has a different owner (and is not PID 1).
+
+It will always return false if SudoChecked returns false or PPIDUIDsChecked returns false.
+*/
+func (i *IDState) IsSudoUser() (sudo bool) {
+
+	if i == nil || !i.sudoChecked || !i.ppidUidChecked {
+		return
+	}
+
+	sudo = i.SudoEnvUser || !i.PPIDUidMatch
+
+	return
+}
+
+// IsSuid is true if the RUID does not match EUID or SUID. It will always return false if UIDsChecked returns false.
+func (i *IDState) IsSuid() (suid bool) {
+
+	if i == nil || !i.uidsChecked {
+		return
+	}
+
+	suid = i.RUID != i.EUID || i.RUID != i.SUID
+
+	return
+}
+
+// IsSgid is true if the RGID does not match EGID or SGID. It will always return false if GIDsChecked returns false.
+func (i *IDState) IsSgid() (sgid bool) {
+
+	if i == nil || !i.gidsChecked {
+		return
+	}
+
+	sgid = i.RGID != i.EGID || i.RGID != i.SGID
+
+	return
+}
+
+// GIDsChecked is true if the GIDs presented can be trusted.
+func (i *IDState) GIDsChecked() (checked bool) {
+
+	if i == nil {
+		return
+	}
+
+	checked = i.gidsChecked
+
+	return
+}
+
+// PPIDGIDsChecked is true if PPIDGidMatch can be trusted.
+func (i *IDState) PPIDGIDsChecked() (checked bool) {
+
+	if i == nil {
+		return
+	}
+
+	checked = i.ppidGidChecked
+
+	return
+}
+
+// PPIDUIDsChecked is true if PPIDUidMatch can be trusted.
+func (i *IDState) PPIDUIDsChecked() (checked bool) {
+
+	if i == nil {
+		return
+	}
+
+	checked = i.ppidUidChecked
+
+	return
+}
+
+// SudoChecked is true if SudoEnvVars can be trusted
+func (i *IDState) SudoChecked() (checked bool) {
+
+	if i == nil {
+		return
+	}
+
+	checked = i.sudoChecked
+
+	return
+}
+
+// UIDsChecked is true if the UIDs presented can be trusted.
+func (i *IDState) UIDsChecked() (checked bool) {
+
+	if i == nil {
+		return
+	}
+
+	checked = i.uidsChecked
+
+	return
+}

funcs_linux.go

@@ -0,0 +1,50 @@
+package sysutils
+
+import (
+	`fmt`
+	`os`
+
+	`golang.org/x/sys/unix`
+	`r00t2.io/sysutils/envs`
+)
+
+// GetIDState returns current ID/elevation information. An IDState should *not* be explicitly created/defined.
+func GetIDState() (ids IDState) {
+
+	var err error
+
+	ids.RUID, ids.EUID, ids.SUID = unix.Getresuid()
+	ids.uidsChecked = true
+	ids.RGID, ids.EGID, ids.SGID = unix.Getresgid()
+	ids.gidsChecked = true
+
+	ids.SudoEnvCmd = envs.HasEnv("SUDO_COMMAND")
+	ids.SudoEnvHome = envs.HasEnv("SUDO_HOME")
+	ids.SudoEnvGroup = envs.HasEnv("SUDO_GID")
+	ids.SudoEnvUser = envs.HasEnv("SUDO_UID") || envs.HasEnv("SUDO_USER")
+	if ids.SudoEnvCmd || ids.SudoEnvHome || ids.SudoEnvGroup || ids.SudoEnvUser {
+		ids.SudoEnvVars = true
+	}
+	ids.sudoChecked = true
+
+	// PID 1 will *always* be root, so that can return a false positive for sudo.
+	if os.Getppid() != 1 {
+		ids.stat = new(unix.Stat_t)
+		if err = unix.Stat(
+			fmt.Sprintf("/proc/%d/stat", os.Getppid()),
+			ids.stat,
+		); err != nil {
+			err = nil
+		} else {
+			ids.PPIDUidMatch = ids.RUID == int(ids.stat.Uid)
+			ids.ppidUidChecked = true
+			ids.PPIDGidMatch = ids.RGID == int(ids.stat.Gid)
+			ids.ppidGidChecked = true
+		}
+	} else {
+		ids.ppidUidChecked = true
+		ids.ppidGidChecked = true
+	}
+
+	return
+}

go.mod

@@ -4,13 +4,21 @@ go 1.23.2
 
 require (
 	github.com/davecgh/go-spew v1.1.1
-	github.com/g0rbe/go-chattr v1.0.1
+	github.com/djherbis/times v1.6.0
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
-	golang.org/x/sys v0.26.0
+	github.com/shirou/gopsutil/v4 v4.25.5
+	golang.org/x/sync v0.15.0
+	golang.org/x/sys v0.33.0
 	honnef.co/go/augeas v0.0.0-20161110001225-ca62e35ed6b8
-	r00t2.io/goutils v1.7.0
-	r00t2.io/sysutils v1.8.1
+	r00t2.io/goutils v1.8.1
 )
 
-// Pending https://github.com/g0rbe/go-chattr/pull/3
-replace github.com/g0rbe/go-chattr => github.com/johnnybubonic/go-chattr v0.0.0-20240126141003-459f46177b13
+require (
+	github.com/ebitengine/purego v0.8.4 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/lufia/plan9stats v0.0.0-20250317134145-8bc96cf8fc35 // indirect
+	github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect
+	github.com/tklauser/go-sysconf v0.3.15 // indirect
+	github.com/tklauser/numcpus v0.10.0 // indirect
+	github.com/yusufpapurcu/wmi v1.2.4 // indirect
+)

go.sum

@@ -1,18 +1,47 @@
 github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/djherbis/times v1.6.0 h1:w2ctJ92J8fBvWPxugmXIv7Nz7Q3iDMKNx9v5ocVH20c=
+github.com/djherbis/times v1.6.0/go.mod h1:gOHeRAz2h+VJNZ5Gmc/o7iD9k4wW7NMVqieYCY99oc0=
+github.com/ebitengine/purego v0.8.4 h1:CF7LEKg5FFOsASUj0+QwaXf8Ht6TlFxg09+S9wz0omw=
+github.com/ebitengine/purego v0.8.4/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
+github.com/go-ole/go-ole v1.2.6/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
+github.com/go-ole/go-ole v1.3.0 h1:Dt6ye7+vXGIKZ7Xtk4s6/xVdGDQynvom7xCFEdWr6uE=
+github.com/go-ole/go-ole v1.3.0/go.mod h1:5LS6F96DhAwUc7C+1HLexzMXY1xGRSryjyPPKW6zv78=
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
+github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 h1:El6M4kTTCOh6aBiKaUGG7oYTSPP8MxqL4YI3kZKwcP4=
 github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510/go.mod h1:pupxD2MaaD3pAXIBCelhxNneeOaAeabZDe5s4K6zSpQ=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/johnnybubonic/go-chattr v0.0.0-20240126141003-459f46177b13 h1:tgEbuE4bNVjaCWWIB1u9lDzGqH/ZdBTg33+4vNW2rjg=
-github.com/johnnybubonic/go-chattr v0.0.0-20240126141003-459f46177b13/go.mod h1:yQc6VPJfpDDC1g+W2t47+yYmzBNioax/GLiyJ25/IOs=
+github.com/lufia/plan9stats v0.0.0-20250317134145-8bc96cf8fc35 h1:PpXWgLPs+Fqr325bN2FD2ISlRRztXibcX6e8f5FR5Dc=
+github.com/lufia/plan9stats v0.0.0-20250317134145-8bc96cf8fc35/go.mod h1:autxFIvghDt3jPTLoqZ9OZ7s9qTGNAWmYCjVFWPX/zg=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 h1:o4JXh1EVt9k/+g42oCprj/FisM4qX9L3sZB3upGN2ZU=
+github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55/go.mod h1:OmDBASR4679mdNQnz2pUhc2G8CO2JrUAVFDRBDP/hJE=
+github.com/shirou/gopsutil/v4 v4.25.5 h1:rtd9piuSMGeU8g1RMXjZs9y9luK5BwtnG7dZaQUJAsc=
+github.com/shirou/gopsutil/v4 v4.25.5/go.mod h1:PfybzyydfZcN+JMMjkF6Zb8Mq1A/VcogFFg7hj50W9c=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/tklauser/go-sysconf v0.3.15 h1:VE89k0criAymJ/Os65CSn1IXaol+1wrsFHEB8Ol49K4=
+github.com/tklauser/go-sysconf v0.3.15/go.mod h1:Dmjwr6tYFIseJw7a3dRLJfsHAMXZ3nEnL/aZY+0IuI4=
+github.com/tklauser/numcpus v0.10.0 h1:18njr6LDBk1zuna922MgdjQuJFjrdppsZG60sHGfjso=
+github.com/tklauser/numcpus v0.10.0/go.mod h1:BiTKazU708GQTYF4mB+cmlpT2Is1gLk7XVuEeem8LsQ=
+github.com/yusufpapurcu/wmi v1.2.4 h1:zFUKzehAFReQwLys1b/iSMl+JQGSCSjtVqQn9bBrPo0=
+github.com/yusufpapurcu/wmi v1.2.4/go.mod h1:SBZ9tNy3G9/m5Oi98Zks0QjeHVDvuK0qfxQmPyzfmi0=
+golang.org/x/sync v0.15.0 h1:KWH3jNZsfyT6xfAfKiz6MRNmd46ByHDYaZ7KSkCtdW8=
+golang.org/x/sync v0.15.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
+golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201204225414-ed752295db88/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
-golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.0.0-20220615213510-4f61da869c0c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=
+golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/augeas v0.0.0-20161110001225-ca62e35ed6b8 h1:FW42yWB1sGClqswyHIB68wo0+oPrav1IuQ+Tdy8Qp8E=
 honnef.co/go/augeas v0.0.0-20161110001225-ca62e35ed6b8/go.mod h1:44w9OfBSQ9l3o59rc2w3AnABtE44bmtNnRMNC7z+oKE=
-r00t2.io/goutils v1.7.0 h1:iQluWlkOyBwOKaK94D5QSnSMYpGKtMb/5WjefmdfHgI=
-r00t2.io/goutils v1.7.0/go.mod h1:9ObJI9S71wDLTOahwoOPs19DhZVYrOh4LEHmQ8SW4Lk=
+r00t2.io/goutils v1.8.1 h1:TQcUycPKsYn0QI4uCqb56utmvu/vVSxlblBg98iXStg=
+r00t2.io/goutils v1.8.1/go.mod h1:9ObJI9S71wDLTOahwoOPs19DhZVYrOh4LEHmQ8SW4Lk=
 r00t2.io/sysutils v1.1.1/go.mod h1:Wlfi1rrJpoKBOjWiYM9rw2FaiZqraD6VpXyiHgoDo/o=
-r00t2.io/sysutils v1.7.0 h1:zk5IbcbZvq11FoXI/fLvcgyq36lBhPDY6fvC9CunfWE=
-r00t2.io/sysutils v1.7.0/go.mod h1:Sk/7riJp9fteeW9STkdQ/k22huL1J6r05n6wLh5byHY=

ispriv/consts_nix.go

@@ -0,0 +1,14 @@
+//go:build unix
+
+package ispriv
+
+const (
+	sudoEnvPfx   string = "SUDO_"
+	sudoUidEnv   string = sudoEnvPfx + "UID"
+	sudoGidEnv   string = sudoEnvPfx + "GID"
+	sudoUnameEnv string = sudoEnvPfx + "USER"
+)
+
+const (
+	curLoginUidFile string = "/proc/self/loginuid"
+)

ispriv/doc_nix.go

@@ -0,0 +1,7 @@
+//go:build unix
+
+/*
+ispriv provides functions and a method to determine if a process is being run SUID/SGID, under sudo, etc.
+*/
+
+package ispriv

ispriv/doc_windows.go

@@ -0,0 +1,7 @@
+//go:build windows
+
+/*
+ispriv provides functions on Windows to determine the currentl privilege status.
+*/
+
+package ispriv

ispriv/funcs_nix.go

@@ -0,0 +1,68 @@
+//go:build unix
+
+package ispriv
+
+import (
+	`os`
+
+	`github.com/shirou/gopsutil/v4/process`
+)
+
+/*
+	GetProcIDs returns a ProcIDs from a given PID. An error will be raised if the process ID doesn't exist.
+	A negative value indicates "self" (see also GetProcIDsSelf).
+
+	Note that if you are not EUID == 0 (root) or you/the sudo target user does not own the process,
+	the returning ProcIDs is HIGHLY LIKELY to be very inaccurate.
+*/
+func GetProcIDs(pid int32) (p *ProcIDs, err error) {
+
+	var proc ProcIDs
+	var ids []uint32
+
+	if pid < 0 {
+		pid = int32(os.Getpid())
+	}
+
+	if proc.proc, err = process.NewProcess(pid); err != nil {
+		return
+	}
+	if ids, err = proc.proc.Gids(); err != nil {
+		return
+	}
+	p.gids = &IdInfo{
+		real:       uint(ids[0]),
+		effective:  uint(ids[1]),
+		savedSet:   uint(ids[2]),
+		filesystem: nil,
+	}
+	if len(ids) == 4 {
+		p.gids.filesystem = new(uint)
+		*p.gids.filesystem = uint(ids[3])
+	}
+	if ids, err = proc.proc.Uids(); err != nil {
+		return
+	}
+	p.uids = &IdInfo{
+		real:       uint(ids[0]),
+		effective:  uint(ids[1]),
+		savedSet:   uint(ids[2]),
+		filesystem: nil,
+	}
+	if len(ids) == 4 {
+		p.uids.filesystem = new(uint)
+		*p.uids.filesystem = uint(ids[3])
+	}
+
+	p = &proc
+
+	return
+}
+
+// GetProcIDsSelf returns a ProcIDs from the current process' PID.
+func GetProcIDsSelf() (p *ProcIDs, err error) {
+
+	p, err = GetProcIDs(int32(os.Getpid()))
+
+	return
+}

ispriv/funcs_procids_nix.go

@@ -0,0 +1,426 @@
+//go:build unix
+
+package ispriv
+
+import (
+	`errors`
+	`os`
+	`os/user`
+	`strconv`
+	`strings`
+
+	`github.com/shirou/gopsutil/v4/process`
+	`golang.org/x/sys/unix`
+	`r00t2.io/sysutils/envs`
+	`r00t2.io/sysutils/paths`
+)
+
+// GetEffective returns the EUID/EGID.
+func (p *ProcIDs) GetEffective() (euid, egid uint) {
+
+	euid = p.uids.effective
+	egid = p.gids.effective
+
+	return
+}
+
+// GetFS returns the FSUID/FSGID. Not all platforms have this, in which case they'll be nil.
+func (p *ProcIDs) GetFS() (fsuid, fsgid *uint) {
+
+	if p.uids.filesystem != nil {
+		fsuid = new(uint)
+		*fsuid = *p.uids.filesystem
+	}
+	if p.gids.filesystem != nil {
+		fsgid = new(uint)
+		*fsgid = *p.gids.filesystem
+	}
+
+	return
+}
+
+/*
+	GetGids returms a set of a ProcIDs GIDs.
+	fs will be nil if unsupported on the platform.
+	If invoked with SGID, "savedSet" will be the SGID GID.
+*/
+func (p *ProcIDs) GetGids() (real, effective, savedSet uint, fs *uint) {
+
+	real = p.gids.real
+	effective = p.gids.effective
+	savedSet = p.gids.savedSet
+	if p.gids.filesystem != nil {
+		fs = new(uint)
+		*fs = *p.gids.filesystem
+	}
+
+	return
+}
+
+// GetReal returns the (R)UID/(R)GID.
+func (p *ProcIDs) GetReal() (ruid, rgid uint) {
+
+	ruid = p.uids.real
+	rgid = p.gids.real
+
+	return
+}
+
+// GetSaved returns the SUID/SGID.
+func (p *ProcIDs) GetSaved() (suid, sgid uint) {
+
+	suid = p.uids.savedSet
+	sgid = p.gids.savedSet
+
+	return
+}
+
+/*
+	GetUids returms a set of a ProcIDs UIDs.
+	fs will be nil if unsupported on the platform.
+	If invoked with SUID, "savedSet" will be the SUID UID.
+*/
+func (p *ProcIDs) GetUids() (real, effective, savedSet uint, fs *uint) {
+
+	real = p.uids.real
+	effective = p.uids.effective
+	savedSet = p.uids.savedSet
+	if p.uids.filesystem != nil {
+		fs = new(uint)
+		*fs = *p.uids.filesystem
+	}
+
+	return
+}
+
+/*
+	IsSGID returns true if the process is Set GID/SGID.
+
+	Note that it will return false if invoked by a group with the same GID as an SGID that's set.
+*/
+func (p *ProcIDs) IsSGID() (isSgid bool) {
+
+	isSgid = p.gids.real != p.gids.savedSet
+
+	return
+}
+
+/*
+	IsSUID returns true if the process is Set UID/SUID.
+
+	Note that it will return false if invoked by a user with the same UID as an SUID that's set.
+*/
+func (p *ProcIDs) IsSUID() (isSuid bool) {
+
+	isSuid = p.uids.real != p.uids.savedSet
+
+	return
+}
+
+/*
+	IsSudo does a very fast (and potentially inaccurate) evaluation of whether the process is running under sudo.
+
+	DO NOT use this function for security-sensitive uses, fully accurate results, or critical implementations!
+	Use IsSudoWithConfidence instead for those cases.
+	IsSudo only does the most basic of checking, which can be easily and completely overridden by a non-privileged user.
+*/
+func (p *ProcIDs) IsSudo() (isSudo bool) {
+
+	// This is how every other Joe Blow does this. It's an extremely dumb way to do it. The caller has been warned.
+	for k, _ := range envs.GetEnvMap() {
+		if strings.HasPrefix(k, sudoEnvPfx) {
+			isSudo = true
+			return
+		}
+	}
+
+	return
+}
+
+/*
+	IsSudoDetailed returns true for a very fast evaluation of whether the process is running under sudo,
+	and information about that context.
+	(If isSudo is false, originalUid/originalGid will both be -1 and originalUser will be nil.)
+
+	DO NOT use this function for security-sensitive uses, fully accurate results, or critical implementations!
+	Use IsSudoWithConfidenceDetailed instead for those cases.
+	IsSudoDetailed only does the most basic of checking, which can be easily and completely overridden by a non-privileged user.
+*/
+func (p *ProcIDs) IsSudoDetailed() (isSudo bool, originalUid, originalGid int, originalUser *user.User, err error) {
+
+	if originalUid, originalGid, originalUser, err = p.getSudoInfoEnv(); err != nil {
+		return
+	}
+
+	if originalUid >= 0 || originalGid >= 0 || originalUser != nil {
+		isSudo = true
+	}
+
+	return
+}
+
+/*
+	IsSudoWithConfidence is like IsSudo, but is *much* more throrough.
+
+	It not only returns isSudo, which is true if *any* indicators pass,
+	but also:
+
+	* a confidence value (which indicates *how many* indicators *passed*)
+	* a maxConfidence value (which indicates how many indicators were *tested*)
+	* a score value (which is a float indicating overall confidence on a fixed and weighted scale; higher is more confident, 1.0 indicates 100% confidence)
+*/
+func (p *ProcIDs) IsSudoWithConfidence() (isSudo bool, confidence, maxConfidence uint, score float64, err error) {
+
+	// confidence/maxConfidence are not used directly; they're unweighted counters.
+	var scoreConf uint
+	var scoreMaxConf uint
+
+	score = float64(scoreConf) / float64(scoreMaxConf)
+
+	return
+}
+
+/*
+	IsSudoWithConfidenceDetailed is like IsSudoDetailed, but is *much* more throrough.
+
+	It not only returns the same results as IsSudoDetailed, but includes the same scoring values/system as IsSudoWithConfidence.
+*/
+func (p *ProcIDs) IsSudoWithConfidenceDetailed() (isSudo bool, confidence, maxConfidence uint, score float64, originalUid, originalGid int, originalUser *user.User, err error) {
+
+	var b []byte
+	var ok bool
+	var permErr bool
+	var envUid int
+	var envGid int
+	var scoreConf uint
+	var scoreMaxConf uint
+	var curUser *user.User
+	var envUser *user.User
+	var curUid uint64
+	var fstat unix.Stat_t
+	var fsUid int
+	var procFiles []process.OpenFilesStat
+	var loginUidFile string = curLoginUidFile
+
+	if curUser, err = user.Current(); err != nil {
+		return
+	}
+	if curUid, err = strconv.ParseUint(curUser.Uid, 10, 32); err != nil {
+		return
+	}
+
+	if procFiles, err = p.proc.OpenFiles(); err != nil {
+		return
+	}
+
+	// Env vars; only score 1x/each.
+	maxConfidence += 3
+	scoreMaxConf += 3
+	if envUid, envGid, envUser, err = p.getSudoInfoEnv(); err != nil {
+		return
+	}
+	originalUid, originalGid, originalUser = envUid, envGid, envUser
+	if envUid >= 0 {
+		confidence++
+		scoreConf++
+	}
+	if envGid >= 0 {
+		confidence++
+		scoreConf++
+	}
+	if envUser != nil {
+		confidence++
+		scoreConf++
+	}
+
+	/*
+		TTY/PTY ownership. We (can) only check this if we're running in an interactive session.
+
+		Typically this is done via (golang.org/x/term).IsTerminal(),
+		That pulls in a bunch of stuff I don't need, though, so I'll just replicate (...).IsTerminal() here;
+		it's just a wrapped single function call.
+	*/
+	// procFiles[0] is always STDIN. Whether it's a pipe, or TTY/PTY, or file, etc.
+	// (likewise, procFiles[1] is always STDOUT, procFiles[2] is always STDERR); however...
+	if _, err = unix.IoctlGetTermios(int(procFiles[0].Fd), unix.TCGETS); err == nil {
+		// Interactive
+		maxConfidence++
+		// This is only worth 2. It's pretty hard to fake unless origin user is root,
+		// but it's ALSO usually set to the target user.
+		scoreMaxConf += 2
+		fstat = unix.Stat_t{}
+		if err = unix.Fstat(int(procFiles[0].Fd), &fstat); err != nil {
+			return
+		}
+		if uint64(fstat.Uid) != curUid {
+			// This is a... *potential* indicator, if a lateral sudo was done (user1 => user2),
+			// or root used sudo to *drop* privs to a regular user.
+			// We mark it as a pass for confidence since it IS a terminal, and it's permission-related.
+			confidence++
+			scoreConf += 2
+			originalUid = int(fstat.Uid)
+		}
+	} else {
+		// err is OK; just means non-interactive. No counter or score/max score increase; basically a NO-OP.
+		err = nil
+	}
+
+	// /proc/self/loginuid
+	// This is a REALLY good indicator. Probably the strongest next to reverse-walking the proc tree. It depends on PAM and auditd support, I think,
+	// BUT if it's present it's *really* really strong.
+	if ok, err = paths.RealPathExists(&loginUidFile); err != nil {
+		return
+	}
+	if ok {
+		maxConfidence++
+		scoreMaxConf += 5
+		if b, err = os.ReadFile(loginUidFile); err != nil {
+			return
+		}
+		if fsUid, err = strconv.Atoi(strings.TrimSpace(string(b))); err != nil {
+			return
+		}
+		if uint64(fsUid) != curUid {
+			confidence++
+			scoreConf += 5
+			originalUid = fsUid
+		}
+	}
+
+	// proc tree reverse walking.
+	// This is, by far, the most reliable method.
+	// There are some valid conditions in which this would fail due to permissions
+	// (e.g. lateral sudo: user1 => user2), but if it's a permission error it's *probably*
+	// a lateral move anyways.
+	if isSudo, permErr, originalUid, originalGid, originalUser, err = p.revProcWalk(); err != nil {
+		return
+	}
+	maxConfidence++
+	scoreMaxConf += 10
+	if permErr {
+		confidence++
+		scoreConf += 5
+	} else if isSudo {
+		confidence++
+		scoreConf += 10
+	}
+
+	score = float64(scoreConf) / float64(scoreMaxConf)
+
+	return
+}
+
+/*
+	getSudoInfoEnv returns env var driven sudo information.
+
+	These are in no way guaranteed to be accurate as the user can remove or override them.
+*/
+func (p *ProcIDs) getSudoInfoEnv() (uid, gid int, u *user.User, err error) {
+
+	var ok bool
+	var val string
+	var envMap map[string]string = envs.GetEnvMap()
+
+	uid = -1
+	gid = -1
+
+	if val, ok = envMap[sudoUnameEnv]; ok {
+		if u, err = user.Lookup(val); err != nil {
+			return
+		}
+	}
+	if val, ok = envMap[sudoUidEnv]; ok {
+		if uid, err = strconv.Atoi(val); err != nil {
+			return
+		}
+	}
+	if val, ok = envMap[sudoGidEnv]; ok {
+		if gid, err = strconv.Atoi(val); err != nil {
+			return
+		}
+	}
+
+	return
+}
+
+/*
+	revProcWalk walks up the process tree ("proctree") until it either:
+
+		* finds a process invoked with sudo (true)
+		* hits PID == 1 (false)
+		* hits a permission error (true-ish)
+*/
+func (p *ProcIDs) revProcWalk() (sudoFound, isPermErr bool, origUid, origGid int, origUser *user.User, err error) {
+
+	var cmd []string
+	var parent *ProcIDs
+	var parentPid int32
+	var parentUname string
+	var parentUids []uint32
+	var parentGids []uint32
+
+	origUid = -1
+	origGid = -1
+
+	parent = p
+	for {
+		if parent == nil || parent.proc.Pid == 1 {
+			break
+		}
+		if cmd, err = parent.proc.CmdlineSlice(); err != nil {
+			if errors.Is(err, os.ErrPermission) {
+				isPermErr = true
+				err = nil
+			}
+			return
+		}
+		if cmd[0] == "sudo" {
+			sudoFound = true
+			if parentUname, err = parent.proc.Username(); err != nil {
+				if errors.Is(err, os.ErrPermission) {
+					isPermErr = true
+					err = nil
+				}
+				return
+			}
+			if parentUids, err = parent.proc.Uids(); err != nil {
+				if errors.Is(err, os.ErrPermission) {
+					isPermErr = true
+					err = nil
+				}
+				return
+			}
+			if parentGids, err = parent.proc.Gids(); err != nil {
+				if errors.Is(err, os.ErrPermission) {
+					isPermErr = true
+					err = nil
+				}
+				return
+			}
+			if origUser, err = user.Lookup(parentUname); err != nil {
+				return
+			}
+			origUid = int(parentUids[0])
+			origGid = int(parentGids[0])
+		}
+		if sudoFound {
+			break
+		}
+		if parentPid, err = parent.proc.Ppid(); err != nil {
+			if errors.Is(err, os.ErrPermission) {
+				isPermErr = true
+				err = nil
+			}
+			return
+		}
+		if parent, err = GetProcIDs(parentPid); err != nil {
+			if errors.Is(err, os.ErrPermission) {
+				isPermErr = true
+				err = nil
+			}
+			return
+		}
+	}
+
+	return
+}

ispriv/funcs_windows.go

@@ -0,0 +1,60 @@
+//go:build windows
+
+package ispriv
+
+import (
+	`golang.org/x/sys/windows`
+)
+
+// IsAdmin returns true if currently running with Administrator privileges.
+func IsAdmin() (admin bool, err error) {
+
+	var sid *windows.SID
+	var tok windows.Token
+
+	if err = windows.AllocateAndInitializeSid(
+		&windows.SECURITY_NT_AUTHORITY,      // identAuth
+		2,                                   // subAuth
+		windows.SECURITY_BUILTIN_DOMAIN_RID, // subAuth0
+		windows.DOMAIN_ALIAS_RID_ADMINS,     // subAuth1
+		0, 0, 0, 0, 0, 0,                    // subAuth2-10
+		&sid, // sid
+	); err != nil {
+		return
+	}
+	defer windows.FreeSid(sid)
+
+	tok = windows.Token(0)
+	if admin, err = tok.IsMember(sid); err != nil {
+		return
+	}
+
+	return
+}
+
+// IsElevated returns true if running in an elevated ("Run as Administrator") context.
+func IsElevated() (elevated bool) {
+
+	var tok windows.Token = windows.Token(0)
+
+	elevated = tok.IsElevated()
+
+	return
+}
+
+/*
+	IsPrivileged indicates that the current security context is running both
+	with Administrator priviliges AND is elevated.
+*/
+func IsPrivileged() (privileged bool, err error) {
+
+	if privileged, err = IsAdmin(); err != nil {
+		return
+	}
+
+	if privileged {
+		privileged = IsElevated()
+	}
+
+	return
+}

ispriv/types_nix.go

@@ -0,0 +1,19 @@
+//go:build unix
+
+package ispriv
+
+import (
+	`github.com/shirou/gopsutil/v4/process`
+)
+
+type ProcIDs struct {
+	proc *process.Process
+	uids *IdInfo
+	gids *IdInfo
+}
+type IdInfo struct {
+	real       uint
+	effective  uint
+	savedSet   uint
+	filesystem *uint
+}

paths/TODO

@@ -0,0 +1 @@
+- search criteria should *also* support a timestamp range (e.g. so a search can be restricted to both older than AND newer than; e.g. older than 00:00, newer than 01:00)

paths/consts.go

@@ -0,0 +1,42 @@
+package paths
+
+import (
+	"io/fs"
+)
+
+// Mostly just for reference.
+const (
+	// ModeDir | ModeSymlink | ModeNamedPipe | ModeSocket | ModeDevice | ModeCharDevice | ModeIrregular
+	modeDir              pathMode = pathMode(fs.ModeDir)
+	modeSymlink          pathMode = pathMode(fs.ModeSymlink)
+	modePipe             pathMode = pathMode(fs.ModeNamedPipe)
+	modeSocket           pathMode = pathMode(fs.ModeSocket)
+	modeDev              pathMode = pathMode(fs.ModeDevice)
+	modeCharDev          pathMode = pathMode(fs.ModeCharDevice)
+	modeIrregular        pathMode = pathMode(fs.ModeIrregular)
+	modeAnyExceptRegular pathMode = modeDir | modeSymlink | modePipe | modeSocket | modeDev | modeCharDev | modeIrregular
+)
+
+// Miss reasons
+const (
+	MissNoMiss  missReason = ""
+	MissNoMeta  missReason = "Could not determine metadata"
+	MissBadBase missReason = "Base name does not match BasePtrn"
+	MissBadPath missReason = "Path does not match PathPtrn"
+	MissBadTime missReason = "Time(s) does not/do not match Age"
+	MissFile    missReason = "Object is a file and NoFiles is set"
+	MissType    missReason = "Object does not match TargetType"
+)
+
+// Times
+const TimeAny pathTimeType = 0
+const (
+	// TimeAccessed == atime
+	TimeAccessed pathTimeType = 1 << iota
+	// TimeCreated == "birth" time (*NOT* ctime! See TimeChanged)
+	TimeCreated
+	// TimeChanged == ctime
+	TimeChanged
+	// TimeModified == mtime
+	TimeModified
+)

paths/errs.go

@@ -0,0 +1,12 @@
+package paths
+
+import (
+	`errors`
+)
+
+var (
+	ErrNilErrChan      error = errors.New("an initialized error channel is required")
+	ErrNilMatchChan    error = errors.New("an initialized matches channel is required")
+	ErrNilMismatchChan error = errors.New("an initialized mismatches channel is required")
+	ErrNilWg           error = errors.New("a non-nil sync.WaitGroup is required")
+)

paths/funcs.go

@@ -19,14 +19,22 @@
 package paths
 
 import (
+	`context`
 	"errors"
 	"fmt"
 	"io/fs"
 	"os"
 	"os/user"
 	"path/filepath"
+	`sort`
 	"strings"
+	`sync`
+	`time`
+
 	// "syscall"
+
+	`github.com/djherbis/times`
+	`r00t2.io/goutils/bitmask`
 )
 
 /*
@@ -266,3 +274,236 @@ func RealPathExistsStat(path *string) (exists bool, stat os.FileInfo, err error)
 
 	return
 }
+
+// SearchFsPaths gets a file/directory/etc. path list based on the provided criteria.
+func SearchFsPaths(matcher FsSearchCriteria) (found, miss []*FsSearchResult, err error) {
+
+	var matched *FsSearchResult
+	var missed *FsSearchResult
+
+	if err = RealPath(&matcher.Root); err != nil {
+		return
+	}
+
+	if err = filepath.WalkDir(
+		matcher.Root,
+		func(path string, d fs.DirEntry, inErr error) (outErr error) {
+
+			if inErr != nil {
+				outErr = inErr
+				return
+			}
+
+			if matched, missed, outErr = matcher.Match(path, d, nil); outErr != nil {
+				return
+			}
+			if matched != nil && !matcher.NoMatch {
+				found = append(found, matched)
+			}
+			if missed != nil && !matcher.NoMismatch {
+				miss = append(miss, missed)
+			}
+
+			return
+		},
+	); err != nil {
+		return
+	}
+
+	if found == nil || len(found) == 0 {
+		return
+	}
+
+	// And sort them.
+	sort.Slice(
+		found,
+		func(i, j int) (isLess bool) {
+			isLess = found[i].Path < found[j].Path
+			return
+		},
+	)
+
+	return
+}
+
+/*
+	SearchFsPathsAsync is exactly like SearchFsPaths, but dispatches off concurrent
+	workers for the filtering logic instead of performing iteratively/recursively.
+	It may, in some cases, be *slightly more* performant and *slightly less* in others.
+	Note that unlike SearchFsPaths, the results written to the
+	FsSearchCriteriaAsync.ResChan are not guaranteed to be in any predictable order.
+
+	All channels are expected to have already been initialized by the caller.
+	They will not be closed by this function.
+*/
+func SearchFsPathsAsync(matcher FsSearchCriteriaAsync) {
+
+	var err error
+	var wgLocal sync.WaitGroup
+	var doneChan chan bool = make(chan bool, 1)
+
+	if matcher.ErrChan == nil {
+		panic(ErrNilErrChan)
+		return
+	}
+
+	if matcher.WG == nil {
+		matcher.ErrChan <- ErrNilWg
+		return
+	}
+
+	defer matcher.WG.Done()
+
+	if matcher.ResChan == nil && !matcher.NoMatch {
+		matcher.ErrChan <- ErrNilMatchChan
+		return
+	}
+	if matcher.MismatchChan == nil && !matcher.NoMismatch {
+		matcher.ErrChan <- ErrNilMismatchChan
+		return
+	}
+
+	if err = RealPath(&matcher.Root); err != nil {
+		matcher.ErrChan <- err
+		return
+	}
+
+	if matcher.Semaphore != nil && matcher.SemaphoreCtx == nil {
+		matcher.SemaphoreCtx = context.Background()
+	}
+
+	if err = filepath.WalkDir(
+		matcher.Root,
+		func(path string, de fs.DirEntry, inErr error) (outErr error) {
+
+			if inErr != nil {
+				inErr = filterNoFileDir(inErr)
+				if inErr != nil {
+					outErr = inErr
+					return
+				}
+			}
+
+			wgLocal.Add(1)
+			if matcher.Semaphore != nil {
+				if err = matcher.Semaphore.Acquire(matcher.SemaphoreCtx, 1); err != nil {
+					return
+				}
+			}
+
+			go func(p string, d fs.DirEntry) {
+				var pErr error
+				var pResMatch *FsSearchResult
+				var pResMiss *FsSearchResult
+
+				defer wgLocal.Done()
+
+				if matcher.Semaphore != nil {
+					defer matcher.Semaphore.Release(1)
+				}
+
+				if pResMatch, pResMiss, pErr = matcher.Match(p, d, nil); pErr != nil {
+					matcher.ErrChan <- pErr
+					return
+				}
+
+				if pResMatch != nil && !matcher.NoMatch {
+					matcher.ResChan <- pResMatch
+				}
+				if pResMiss != nil && !matcher.NoMismatch {
+					matcher.MismatchChan <- pResMiss
+				}
+			}(path, de)
+
+			return
+		},
+	); err != nil {
+		err = filterNoFileDir(err)
+		if err != nil {
+			matcher.ErrChan <- err
+			return
+		}
+	}
+
+	go func() {
+		wgLocal.Wait()
+		doneChan <- true
+	}()
+
+	<-doneChan
+
+	return
+}
+
+/*
+	filterTimes checks a times.Timespec of a file using:
+		* an age specified by the caller
+		* an ageType bitmask for types of times to compare
+		* an olderThan bool (if false, the file must be younger than)
+		* an optional "now" timestamp for the age derivation.
+*/
+func filterTimes(tspec times.Timespec, age *time.Duration, ageType *pathTimeType, olderThan bool, now *time.Time) (include bool) {
+
+	var curAge time.Duration
+	var mask *bitmask.MaskBit
+	var tfunc func(t *time.Duration) (match bool) = func(t *time.Duration) (match bool) {
+		if olderThan {
+			match = *t > *age
+		} else {
+			match = *t < *age
+		}
+		return
+	}
+
+	if tspec == nil || age == nil || ageType == nil {
+		return
+	}
+
+	mask = ageType.Mask()
+
+	if now == nil {
+		now = new(time.Time)
+		*now = time.Now()
+	}
+
+	// BTIME (if supported)
+	if tspec.HasBirthTime() && (mask.HasFlag(bitmask.MaskBit(TimeAny)) || mask.HasFlag(bitmask.MaskBit(TimeCreated))) {
+		curAge = now.Sub(tspec.BirthTime())
+		if include = tfunc(&curAge); include {
+			return
+		}
+	}
+	// MTIME
+	if mask.HasFlag(bitmask.MaskBit(TimeAny)) || mask.HasFlag(bitmask.MaskBit(TimeModified)) {
+		curAge = now.Sub(tspec.ModTime())
+		if include = tfunc(&curAge); include {
+			return
+		}
+	}
+	// CTIME (if supported)
+	if tspec.HasChangeTime() && (mask.HasFlag(bitmask.MaskBit(TimeAny)) || mask.HasFlag(bitmask.MaskBit(TimeChanged))) {
+		curAge = now.Sub(tspec.ChangeTime())
+		if include = tfunc(&curAge); include {
+			return
+		}
+	}
+	// ATIME
+	if mask.HasFlag(bitmask.MaskBit(TimeAny)) || mask.HasFlag(bitmask.MaskBit(TimeAccessed)) {
+		curAge = now.Sub(tspec.AccessTime())
+		if include = tfunc(&curAge); include {
+			return
+		}
+	}
+
+	return
+}
+
+func filterNoFileDir(err error) (filtered error) {
+
+	filtered = err
+	if errors.Is(err, fs.ErrNotExist) {
+		filtered = nil
+	}
+
+	return
+}

paths/funcs_fssearchcriteria.go

@@ -0,0 +1,125 @@
+package paths
+
+import (
+	`io/fs`
+	`os`
+	`path/filepath`
+	`time`
+
+	`github.com/djherbis/times`
+	`r00t2.io/goutils/bitmask`
+)
+
+/*
+	Match returns match (a  ptr to a FsSearchResult if the specified path matches, otherwise nil),
+	miss (ptr the specified path does not match, otherwise nil), and an fs.DirEntry and fs.FileInfo
+	for path. d and/or fi may be nil.
+
+	If err is not nil, it represents an unexpected error and as such, both match and miss should be nil.
+
+	Match, miss, and err will all be nil if the filesystem object/path does not exist.
+*/
+func (f *FsSearchCriteria) Match(path string, d fs.DirEntry, fi fs.FileInfo) (match, miss *FsSearchResult, err error) {
+
+	var typeMode fs.FileMode
+	var m FsSearchResult
+	var typeFilter *bitmask.MaskBit = bitmask.NewMaskBitExplicit(uint(f.TargetType))
+
+	m = FsSearchResult{
+		Path:     path,
+		DirEntry: d,
+		FileInfo: fi,
+		Criteria: f,
+	}
+
+	if f == nil {
+		return
+	}
+
+	// A DirEntry can be created from a FileInfo but not vice versa.
+	if m.FileInfo == nil {
+		if m.DirEntry != nil {
+			if m.FileInfo, err = m.DirEntry.Info(); err != nil {
+				err = filterNoFileDir(err)
+				if err != nil {
+					return
+				}
+			}
+		} else {
+			if f.FollowSymlinks {
+				if m.FileInfo, err = os.Stat(path); err != nil {
+					err = filterNoFileDir(err)
+					if err != nil {
+						return
+					}
+				}
+			} else {
+				if m.FileInfo, err = os.Lstat(path); err != nil {
+					err = filterNoFileDir(err)
+					if err != nil {
+						return
+					}
+				}
+			}
+			m.DirEntry = fs.FileInfoToDirEntry(m.FileInfo)
+		}
+	}
+	if m.DirEntry == nil {
+		m.DirEntry = fs.FileInfoToDirEntry(m.FileInfo)
+	}
+	if m.DirEntry == nil || m.FileInfo == nil {
+		m.MissReason = MissNoMeta
+		miss = &m
+		return
+	}
+
+	if m.Times, err = times.Stat(path); err != nil {
+		err = filterNoFileDir(err)
+		if err != nil {
+			return
+		}
+	}
+
+	if f.PathPtrn != nil && !f.PathPtrn.MatchString(path) {
+		m.MissReason = MissBadPath
+		miss = &m
+		return
+	}
+	if f.BasePtrn != nil && !f.BasePtrn.MatchString(filepath.Base(path)) {
+		m.MissReason = MissBadBase
+		miss = &m
+		return
+	}
+
+	// age
+	if f.Age != nil {
+		if f.Now == nil {
+			f.Now = new(time.Time)
+			*f.Now = time.Now()
+		}
+		if !filterTimes(m.Times, f.Age, &f.AgeType, f.OlderThan, f.Now) {
+			m.MissReason = MissBadTime
+			miss = &m
+			return
+		}
+	}
+
+	// fs object type (file, dir, etc.)
+	typeMode = m.FileInfo.Mode().Type()
+	if typeMode == 0 && f.NoFiles {
+		m.MissReason = MissFile
+		miss = &m
+		return
+	} else if typeMode != 0 {
+		if !typeFilter.HasFlag(bitmask.MaskBit(typeMode)) {
+			m.MissReason = MissType
+			miss = &m
+			return
+		}
+	}
+
+	// If it gets to here, it matches.
+	match = &m
+
+	return
+}

paths/funcs_pathtimetype.go

@@ -0,0 +1,13 @@
+package paths
+
+import (
+	`r00t2.io/goutils/bitmask`
+)
+
+// Mask returns a bitmask.MaskBit from a pathTimeType.
+func (p *pathTimeType) Mask() (mask *bitmask.MaskBit) {
+
+	mask = bitmask.NewMaskBitExplicit(uint(*p))
+
+	return
+}

paths/types.go

@@ -0,0 +1,136 @@
+package paths
+
+import (
+	`context`
+	`io/fs`
+	`regexp`
+	`sync`
+	`time`
+
+	`github.com/djherbis/times`
+	`golang.org/x/sync/semaphore`
+	`r00t2.io/goutils/bitmask`
+)
+
+// FsSearchCriteria contains filter criteria for SearchFsPaths* functions.
+type FsSearchCriteria struct {
+	// Root indicates the root to search.
+	Root string `json:"root" toml:"RootPath" yaml:"Root Path" xml:"root,attr" validate:"dir"`
+	// NoMatch, if true, will not return matches. If NoMatch and NoMismatch are both true, no results will be returned.
+	NoMatch bool `json:"no_match" toml:"NoMatch" yaml:"No Matches" xml:"noMatch,attr"`
+	// NoMismatch, if true, will not return mismatches. If NoMatch and NoMismatch are both true, no results will be returned.
+	NoMismatch bool `json:"no_miss" toml:"NoMismatch" yaml:"No Mismatches" xml:"noMiss,attr"`
+	/*
+		TargetType defines what types of filesystem objects should be matched.
+		It can consist of one or more (io/)fs.FileMode types OR'd together
+		(ensure they are part of (io/)fs.ModeType).
+		(You can use 0 to match regular files explicitly, and/or NoFiles = true to exclude them.)
+	*/
+	TargetType fs.FileMode `json:"type_tgt" toml:"TargetType" yaml:"Target Type" xml:"typeTgt,attr"`
+	// NoFiles excludes files from TargetType-matching (as there isn't a way to explicitly exclude files otherwise if a non-zero mode is given).
+	NoFiles bool `json:"no_file" toml:"ExcludeFiles" yaml:"Exclude Files" xml:"noFile,attr"`
+	// FollowSymlinks, if true and a path being tested is a symlink, will use metadata (age, etc.) of the symlink itself rather than the link target.
+	FollowSymlinks bool `json:"follow_sym" toml:"FollowSymlinks" yaml:"Follow Symlinks" xml:"followSym,attr"`
+	// BasePtrn, if specified, will apply to the *base name (that is, quux.txt rather than /foo/bar/baz/quux.txt). See also PathPtrn.
+	BasePtrn *regexp.Regexp `json:"ptrn_base,omitempty" toml:"BaseNamePattern,omitempty" yaml:"Base Name Pattern,omitempty" xml:"ptrnBase,attr,omitempty"`
+	// PathPtrn, if specified, will apply to the *full path* (e.g. /foo/bar/baz/quux.txt, not just quux.txt). See also BasePtrn.
+	PathPtrn *regexp.Regexp `json:"ptrn_path,omitempty" toml:"PathPattern,omitempty" yaml:"Path Pattern,omitempty" xml:"ptrnPath,attr,omitempty"`
+	/*
+		Age, if specified, indicates the comparison of Now againt the AgeType of filesystem objects.
+		Use OlderThan to indicate if it should be older or newer.
+	*/
+	Age *time.Duration `json:"age,omitempty" toml:"Age,omitempty" yaml:"Age,omitempty" xml:"age,attr,omitempty"`
+	/*
+		AgeType can be one (or more, OR'd together) of the Time* constants in this package (TimeAny, TimeAccessed, TimeCreated,
+		TimeChanged, TimeModified) to indicate what timestamp(s) to use for comparing Age.
+
+		The zero-value is TimeAny.
+
+		The first matching timestamp will pass all time comparisons.
+		Be mindful of timestamp type support/limitations per OS/filesystem of Root.
+
+		Completely unused if Age is nil.
+	*/
+	AgeType pathTimeType `json:"type_age" toml:"AgeType" yaml:"Age Type" xml:"typeAge,attr"`
+	/*
+		OlderThan, if true (and Age is not nil), indicates that matching filesystem objects should have their
+		AgeType older than Now. If false, their AgeType should be *newer* than Now.
+
+		Completely unused if Age is nil.
+	*/
+	OlderThan bool `json:"older" toml:"OlderThan" yaml:"Older Than" xml:"older,attr"`
+	/*
+		Now expresses a time to compare to Age via AgeType and OlderThan.
+		Note that it may be any valid time, not necessarily "now".
+		If Age is specified but Now is nil, it will be populated with time.Now() when the search is invoked.
+
+		Completely unused if Age is nil.
+	*/
+	Now *time.Time `json:"now,omitempty" toml:"Now,omitempty" yaml:"Now,omitempty" xml:"now,attr,omitempty"`
+}
+
+// FsSearchCriteriaAsync extends FsSearchCriteria for use in an asynchronous (goroutine) manner.
+type FsSearchCriteriaAsync struct {
+	FsSearchCriteria
+	/*
+		WG should be a non-nil pointer to a sync.WaitGroup.
+		This is used to manage searching completion to the caller.
+
+		.Done() will be called once within the search function, but no .Add() will be called;
+		.Add() should be done by the caller beforehand.
+	*/
+	WG *sync.WaitGroup
+	// ResChan must be a non-nil channel for (positive) match results to be sent to.
+	ResChan chan *FsSearchResult
+	// MismatchChan, if not nil, will have negative matches/"misses" sent to it.
+	MismatchChan chan *FsSearchResult
+	/*
+		ErrChan should be a non-nil error channel for any unexpected errors encountered.
+
+		If nil, a panic will be raised.
+	*/
+	ErrChan chan error
+	/*
+		Semaphore is completely optional, but if non-nil
+		it will be used to limit concurrent filesystem
+		object processing.
+
+		It is generally a Very Good Idea(TM) to use this,
+		as the default is to dispatch all processing concurrently.
+		This can lead to some heavy I/O and CPU wait.
+
+		(See https://pkg.go.dev/golang.org/x/sync/semaphore for details.)
+	*/
+	Semaphore *semaphore.Weighted
+	/*
+		SemaphoreCtx is the context.Context to use for Semaphore.
+		If nil (but Sempaphore is not), one will be created locally/internally.
+	*/
+	SemaphoreCtx context.Context
+}
+
+// FsSearchResult contains a match/miss result for FsSearchCriteria and FsSearchCriteriaAsync.
+type FsSearchResult struct {
+	/*
+		Path is the path to the object on the filesystem.
+		It may or may not exist at the time of return,
+		but will not be an empty string.
+	*/
+	Path string `json:"path" toml:"Path" yaml:"Path" xml:"path,attr"`
+	// DirEntry is the fs.DirEntry for the Path; note that .Name() is the base name only. TODO: serialization?
+	DirEntry fs.DirEntry `json:"-" toml:"-" yaml:"-" xml:"-"`
+	// FileInfo is the fs.FileInfo for the Path; note that .Name() is the base name only. TODO: serialization?
+	FileInfo fs.FileInfo `json:"-" toml:"-" yaml:"-" xml:"-"`
+	// Criteria is the evaluated criteria specified that this FsSearchResult matched.
+	Criteria *FsSearchCriteria `json:"criteria" toml:"Criteria" yaml:"Criteria" xml:"criteria"`
+	// Times holds the mtime, ctime, etc. of the filesystem object (where supported). TODO: serialization?
+	Times times.Timespec `json:"-" toml:"-" yaml:"-" xml:"-"`
+	// MissReason contains the reason the result is a miss (MissNoMiss if a match); see the Miss* constants.
+	MissReason missReason `json:"miss_reason" toml:"MissReason" yaml:"Miss Reason" xml:"miss,attr"`
+}
+
+type missReason string
+
+type pathMode bitmask.MaskBit
+
+type pathTimeType bitmask.MaskBit

types_linux.go

@@ -0,0 +1,53 @@
+package sysutils
+
+import (
+	`golang.org/x/sys/unix`
+)
+
+/*
+IDState collects information about the current running process.
+It should only be used as returned from GetIDState().
+Its methods WILL return false information if any of these values are altered.
+
+FSUID/FSGID are not supported.
+*/
+type IDState struct {
+	// RUID: Real UID
+	RUID int
+	// EUID: Effective UID
+	EUID int
+	// SUID: Saved Set UID
+	SUID int
+	// RGID: Real GID
+	RGID int
+	// EGID: Effective GID
+	EGID int
+	// SGID: Saved Set GID
+	SGID int
+	// SudoEnvUser is true if SUDO_USER or SUDO_UID is set.
+	SudoEnvUser bool
+	// SudoEnvGroup is true if SUDO_GID is set.
+	SudoEnvGroup bool
+	// SudoEnvCmd is true if SUDO_COMMAND is set.
+	SudoEnvCmd bool
+	// SudoEnvHome is true if SUDO_HOME is set.
+	SudoEnvHome bool
+	// SudoEnvVars is true if any of the "well-known" sudo environment variables are set.
+	SudoEnvVars bool
+	// PPIDUidMatch is true if the parent PID UID matches the current process UID (mismatch usually indicates sudo invocation).
+	PPIDUidMatch bool
+	// PPIDGidMatch is true if the parent PID GID matches the current process GID (mismatch usually indicates sudo invocation).
+	PPIDGidMatch bool
+	// uidsChecked is true if the RUID, EUID, and SUID have been populated. (They will be 0 if unset OR if root.)
+	uidsChecked bool
+	// gidsChecked is true if the RGID, EGID, and SGID have been populated. (They will be 0 if unset OR if root.)
+	gidsChecked bool
+	// sudoChecked is true if the SudoEnvVars is set.
+	sudoChecked bool
+	// ppidUidChecked is true if the PPIDUidMatch is set.
+	ppidUidChecked bool
+	// ppidGidChecked is true if the PPIDGidMatch is set.
+	ppidGidChecked bool
+	// stat holds the stat information for the parent PID.
+	stat *unix.Stat_t
+}