109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
// Package tools contains other helper functions too small to justify their own package
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// NOTE: Subject to change, do not rely on this package from outside git-lfs source
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package tools
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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)
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// FileOrDirExists determines if a file/dir exists, returns IsDir() results too.
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func FileOrDirExists(path string) (exists bool, isDir bool) {
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fi, err := os.Stat(path)
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if err != nil {
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return false, false
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} else {
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return true, fi.IsDir()
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}
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}
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// FileExists determines if a file (NOT dir) exists.
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func FileExists(path string) bool {
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ret, isDir := FileOrDirExists(path)
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return ret && !isDir
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}
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// DirExists determines if a dir (NOT file) exists.
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func DirExists(path string) bool {
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ret, isDir := FileOrDirExists(path)
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return ret && isDir
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}
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// FileExistsOfSize determines if a file exists and is of a specific size.
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func FileExistsOfSize(path string, sz int64) bool {
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fi, err := os.Stat(path)
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if err != nil {
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return false
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}
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return !fi.IsDir() && fi.Size() == sz
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}
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// ResolveSymlinks ensures that if the path supplied is a symlink, it is
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// resolved to the actual concrete path
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func ResolveSymlinks(path string) string {
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if len(path) == 0 {
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return path
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}
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if resolved, err := filepath.EvalSymlinks(path); err == nil {
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return resolved
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}
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return path
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}
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// RenameFileCopyPermissions moves srcfile to destfile, replacing destfile if
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// necessary and also copying the permissions of destfile if it already exists
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func RenameFileCopyPermissions(srcfile, destfile string) error {
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info, err := os.Stat(destfile)
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if os.IsNotExist(err) {
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// no original file
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} else if err != nil {
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return err
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} else {
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if err := os.Chmod(srcfile, info.Mode()); err != nil {
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return fmt.Errorf("can't set filemode on file %q: %v", srcfile, err)
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}
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}
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if err := os.Rename(srcfile, destfile); err != nil {
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return fmt.Errorf("cannot replace %q with %q: %v", destfile, srcfile, err)
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}
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return nil
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}
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// CleanPaths splits the given `paths` argument by the delimiter argument, and
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// then "cleans" that path according to the filepath.Clean function (see
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// https://golang.org/pkg/file/filepath#Clean).
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func CleanPaths(paths, delim string) (cleaned []string) {
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// If paths is an empty string, splitting it will yield [""], which will
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// become the filepath ".". To avoid this, bail out if trimmed paths
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// argument is empty.
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if paths = strings.TrimSpace(paths); len(paths) == 0 {
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return
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}
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for _, part := range strings.Split(paths, delim) {
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part = strings.TrimSpace(part)
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cleaned = append(cleaned, filepath.Clean(part))
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}
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return cleaned
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}
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// CleanPathsDefault cleans the paths contained in the given `paths` argument
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// delimited by the `delim`, argument. If an empty set is returned from that
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// split, then the fallback argument is returned instead.
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func CleanPathsDefault(paths, delim string, fallback []string) []string {
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cleaned := CleanPaths(paths, delim)
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if len(cleaned) == 0 {
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return fallback
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}
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return cleaned
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}
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