add filesystem attr (on linux) support
This commit is contained in:
brent saner
parent
8254fd21a3
commit
187ad868db
GPG Key ID:
8C004C2F93481F6B
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@ -0,0 +1,101 @@
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package fsutils
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import (
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`github.com/g0rbe/go-chattr`
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)
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// https://github.com/torvalds/linux/blob/master/include/uapi/linux/fs.h
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const (
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SecureDelete uint32 = chattr.FS_SECRM_FL // Secure deletion
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UnDelete = chattr.FS_UNRM_FL // Undelete
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CompressFile = chattr.FS_COMPR_FL // Compress file
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SyncUpdatechattr = chattr.FS_SYNC_FL // Synchronous updates
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Immutable = chattr.FS_IMMUTABLE_FL // Immutable file
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AppendOnly = chattr.FS_APPEND_FL // Writes to file may only append
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NoDumpFile = chattr.FS_NODUMP_FL // Do not dump file
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NoUpdateAtime = chattr.FS_NOATIME_FL // Do not update atime
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IsDirty = chattr.FS_DIRTY_FL // Nobody knows what this does, lol.
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CompressedClusters = chattr.FS_COMPRBLK_FL // One or more compressed clusters
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NoCompress = chattr.FS_NOCOMP_FL // Don't compress
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EncFile = chattr.FS_ENCRYPT_FL // Encrypted file
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BtreeFmt = chattr.FS_BTREE_FL // Btree format dir
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HashIdxDir = chattr.FS_INDEX_FL // Hash-indexed directory
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AfsDir = chattr.FS_IMAGIC_FL // AFS directory
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ReservedExt3 = chattr.FS_JOURNAL_DATA_FL // Reserved for ext3
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NoMergeTail = chattr.FS_NOTAIL_FL // File tail should not be merged
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DirSync = chattr.FS_DIRSYNC_FL // dirsync behaviour (directories only)
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DirTop = chattr.FS_TOPDIR_FL // Top of directory hierarchies
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ReservedExt4a = chattr.FS_HUGE_FILE_FL // Reserved for ext4
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Extents = chattr.FS_EXTENT_FL // Extents
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LargeEaInode = chattr.FS_EA_INODE_FL // Inode used for large EA
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ReservedExt4b = chattr.FS_EOFBLOCKS_FL // Reserved for ext4
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NoCOWFile = chattr.FS_NOCOW_FL // Do not cow file
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ReservedExt4c = chattr.FS_INLINE_DATA_FL // Reserved for ext4
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UseParentProjId = chattr.FS_PROJINHERIT_FL // Create with parents projid
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ReservedExt2 = chattr.FS_RESERVED_FL // Reserved for ext2 lib
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)
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var (
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// AttrNameValueMap contains a mapping of attribute names (as designated by this package) to their flag values.
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AttrNameValueMap map[string]uint32 = map[string]uint32{
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"SecureDelete": SecureDelete,
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"UnDelete": UnDelete,
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"CompressFile": CompressFile,
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"SyncUpdatechattr": SyncUpdatechattr,
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"Immutable": Immutable,
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"AppendOnly": AppendOnly,
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"NoDumpFile": NoDumpFile,
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"NoUpdateAtime": NoUpdateAtime,
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"IsDirty": IsDirty,
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"CompressedClusters": CompressedClusters,
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"NoCompress": NoCompress,
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"EncFile": EncFile,
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"BtreeFmt": BtreeFmt,
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"HashIdxDir": HashIdxDir,
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"AfsDir": AfsDir,
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"ReservedExt3": ReservedExt3,
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"NoMergeTail": NoMergeTail,
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"DirSync": DirSync,
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"DirTop": DirTop,
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"ReservedExt4a": ReservedExt4a,
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"Extents": Extents,
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"LargeEaInode": LargeEaInode,
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"ReservedExt4b": ReservedExt4b,
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"NoCOWFile": NoCOWFile,
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"ReservedExt4c": ReservedExt4c,
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"UseParentProjId": UseParentProjId,
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"ReservedExt2": ReservedExt2,
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}
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/*
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AttrValueNameMap contains a mapping of attribute flags to their names (as designated by this package).
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Note the oddball here, BtreeFmt and HashIdxDir are actually the same value, so be forewarned.
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*/
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AttrValueNameMap map[uint32]string = map[uint32]string{
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SecureDelete: "SecureDelete",
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UnDelete: "UnDelete",
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CompressFile: "CompressFile",
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SyncUpdatechattr: "SyncUpdatechattr",
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Immutable: "Immutable",
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AppendOnly: "AppendOnly",
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NoDumpFile: "NoDumpFile",
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NoUpdateAtime: "NoUpdateAtime",
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IsDirty: "IsDirty",
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CompressedClusters: "CompressedClusters",
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NoCompress: "NoCompress",
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EncFile: "EncFile",
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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.
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AfsDir: "AfsDir",
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ReservedExt3: "ReservedExt3",
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NoMergeTail: "NoMergeTail",
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DirSync: "DirSync",
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DirTop: "DirTop",
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ReservedExt4a: "ReservedExt4a",
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Extents: "Extents",
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LargeEaInode: "LargeEaInode",
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ReservedExt4b: "ReservedExt4b",
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NoCOWFile: "NoCOWFile",
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ReservedExt4c: "ReservedExt4c",
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UseParentProjId: "UseParentProjId",
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ReservedExt2: "ReservedExt2",
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}
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)
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@ -0,0 +1,44 @@
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package fsutils
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import (
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`os`
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`reflect`
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`github.com/g0rbe/go-chattr`
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`r00t2.io/sysutils/paths`
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)
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func GetAttrs(path string) (attrs *FsAttrs, err error) {
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var f *os.File
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var evalAttrs FsAttrs
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var attrVal uint32
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var reflectVal reflect.Value
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var field reflect.Value
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var myPath string = path
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if err = paths.RealPath(&myPath); err != nil {
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return
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}
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if f, err = os.Open(myPath); err != nil {
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return
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}
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defer f.Close()
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reflectVal = reflect.ValueOf(&evalAttrs).Elem()
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if attrVal, err = chattr.GetAttrs(f); err != nil {
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return
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}
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for attrNm, attrInt := range AttrNameValueMap {
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field = reflectVal.FieldByName(attrNm)
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field.SetBool((attrVal & attrInt) != 0)
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}
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attrs = new(FsAttrs)
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*attrs = evalAttrs
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return
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}
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@ -0,0 +1,43 @@
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package fsutils
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import (
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`os`
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`reflect`
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`github.com/g0rbe/go-chattr`
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`r00t2.io/sysutils/paths`
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)
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func (f *FsAttrs) Apply(path string) (err error) {
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var file *os.File
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var reflectVal reflect.Value
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var fieldVal reflect.Value
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var myPath string = path
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if err = paths.RealPath(&myPath); err != nil {
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return
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}
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if file, err = os.Open(myPath); err != nil {
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return
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}
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defer file.Close()
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reflectVal = reflect.ValueOf(*f)
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for attrNm, attrVal := range AttrNameValueMap {
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fieldVal = reflectVal.FieldByName(attrNm)
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if fieldVal.Bool() {
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if err = chattr.SetAttr(file, attrVal); err != nil {
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return
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}
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} else {
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if err = chattr.UnsetAttr(file, attrVal); err != nil {
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return
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}
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}
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}
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return
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}
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@ -0,0 +1,71 @@
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package fsutils
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import (
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`errors`
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`fmt`
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`os`
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`os/user`
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`testing`
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`r00t2.io/sysutils/paths`
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)
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var (
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testFilename string = "testfile"
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testErrBadUser error = errors.New("test must be run as root, on Linux")
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)
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func testChkUser() (err error) {
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var u *user.User
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if u, err = user.Current(); err != nil {
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return
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}
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if u.Uid != "0" {
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err = testErrBadUser
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return
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}
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return
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}
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func TestSetAttrs(t *testing.T) {
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var err error
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var attrs *FsAttrs
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if attrs, err = GetAttrs(testFilename); err != nil {
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t.Fatalf("Failed to get attrs for %v: %v", testFilename, err)
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}
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t.Logf("Attrs for %v:\n%#v", testFilename, attrs)
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attrs.CompressFile = true
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if err = attrs.Apply(testFilename); err != nil {
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t.Fatalf("Failed to apply attrs to %v: %v", testFilename, err)
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}
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t.Logf("Applied new attrs to %v:\n%#v", testFilename, attrs)
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}
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func TestMain(t *testing.M) {
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var err error
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var rslt int
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if err = testChkUser(); err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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if err = paths.RealPath(&testFilename); err != nil {
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fmt.Println(err)
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os.Exit(2)
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}
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if err = os.WriteFile(testFilename, []byte("This is a test file."), 0o0644); err != nil {
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fmt.Println(err)
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os.Exit(3)
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}
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rslt = t.Run()
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if err = os.Remove(testFilename); err != nil {
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fmt.Printf("Failed to remove test file %v: %v", testFilename, err)
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}
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os.Exit(rslt)
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}
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@ -0,0 +1,32 @@
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package fsutils
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// FsAttrs is a convenience struct around github.com/g0rbe/go-chattr.
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type FsAttrs struct {
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SecureDelete bool
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UnDelete bool
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CompressFile bool
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SyncUpdatechattr bool
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Immutable bool
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AppendOnly bool
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NoDumpFile bool
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NoUpdateAtime bool
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IsDirty bool
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CompressedClusters bool
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NoCompress bool
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EncFile bool
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BtreeFmt bool
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HashIdxDir bool
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AfsDir bool
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ReservedExt3 bool
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NoMergeTail bool
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DirSync bool
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DirTop bool
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ReservedExt4a bool
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Extents bool
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LargeEaInode bool
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ReservedExt4b bool
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NoCOWFile bool
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ReservedExt4c bool
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UseParentProjId bool
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ReservedExt2 bool
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}
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7
go.mod
7
go.mod
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@ -1,3 +1,8 @@
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module r00t2.io/sysutils
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go 1.16
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go 1.21
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require github.com/g0rbe/go-chattr v1.0.1
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// Pending https://github.com/g0rbe/go-chattr/pull/3
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replace github.com/g0rbe/go-chattr => github.com/johnnybubonic/go-chattr v0.0.0-20240126141003-459f46177b13
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