Monorepo for Tangled tangled.org

types: add backwards compat layer to filemode handling

older knots return a full modestring for each file. use some primitive
parsing to extract a filemode in these scenarios.

Signed-off-by: oppiliappan <me@oppi.li>

Changed files
+61 -1
types
+61 -1
types/tree.go
··· 1 1 package types 2 2 3 3 import ( 4 + "fmt" 5 + "os" 4 6 "time" 5 7 6 8 "github.com/go-git/go-git/v5/plumbing" ··· 18 20 } 19 21 20 22 func (t *NiceTree) FileMode() (filemode.FileMode, error) { 21 - return filemode.New(t.Mode) 23 + if numericMode, err := filemode.New(t.Mode); err == nil { 24 + return numericMode, nil 25 + } 26 + 27 + // TODO: this is here for backwards compat, can be removed in future versions 28 + osMode, err := parseModeString(t.Mode) 29 + if err != nil { 30 + return filemode.Empty, nil 31 + } 32 + 33 + conv, err := filemode.NewFromOSFileMode(osMode) 34 + if err != nil { 35 + return filemode.Empty, nil 36 + } 37 + 38 + return conv, nil 39 + } 40 + 41 + // ParseFileModeString parses a file mode string like "-rw-r--r--" 42 + // and returns an os.FileMode 43 + func parseModeString(modeStr string) (os.FileMode, error) { 44 + if len(modeStr) != 10 { 45 + return 0, fmt.Errorf("invalid mode string length: expected 10, got %d", len(modeStr)) 46 + } 47 + 48 + var mode os.FileMode 49 + 50 + // Parse file type (first character) 51 + switch modeStr[0] { 52 + case 'd': 53 + mode |= os.ModeDir 54 + case 'l': 55 + mode |= os.ModeSymlink 56 + case '-': 57 + // regular file 58 + default: 59 + return 0, fmt.Errorf("unknown file type: %c", modeStr[0]) 60 + } 61 + 62 + // parse permissions for owner, group, and other 63 + perms := modeStr[1:] 64 + shifts := []int{6, 3, 0} // bit shifts for owner, group, other 65 + 66 + for i := range 3 { 67 + offset := i * 3 68 + shift := shifts[i] 69 + 70 + if perms[offset] == 'r' { 71 + mode |= os.FileMode(4 << shift) 72 + } 73 + if perms[offset+1] == 'w' { 74 + mode |= os.FileMode(2 << shift) 75 + } 76 + if perms[offset+2] == 'x' { 77 + mode |= os.FileMode(1 << shift) 78 + } 79 + } 80 + 81 + return mode, nil 22 82 } 23 83 24 84 func (t *NiceTree) IsFile() bool {