pkg/archive: make CanonicalTarNameForPath and alias for filepath.ToSlash

filepath.ToSlash is already a no-op on non-Windows platforms, so there's no
need to provide multiple implementations.

We could consider deprecating this function, but it's used in the CLI, and
perhaps it's still useful to have a canonical location to perform this normalization.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

pkg/archive/archive.go

@@ -555,10 +555,17 @@ func newTarAppender(idMapping idtools.IdentityMapping, writer io.Writer, chownOp
 	}
 }
 
-// canonicalTarName provides a platform-independent and consistent posix-style
+// CanonicalTarNameForPath canonicalizes relativePath to a POSIX-style path using
+// forward slashes. It is an alias for filepath.ToSlash, which is a no-op on
+// Linux and Unix.
+func CanonicalTarNameForPath(relativePath string) string {
+	return filepath.ToSlash(relativePath)
+}
+
+// canonicalTarName provides a platform-independent and consistent POSIX-style
 // path for files and directories to be archived regardless of the platform.
 func canonicalTarName(name string, isDir bool) string {
-	name = CanonicalTarNameForPath(name)
+	name = filepath.ToSlash(name)
 
 	// suffix with '/' for directories
 	if isDir && !strings.HasSuffix(name, "/") {

pkg/archive/archive_unix.go

@@ -35,16 +35,8 @@ func getWalkRoot(srcPath string, include string) string {
 	return strings.TrimSuffix(srcPath, string(filepath.Separator)) + string(filepath.Separator) + include
 }
 
-// CanonicalTarNameForPath returns platform-specific filepath
-// to canonical posix-style path for tar archival. p is relative
-// path.
-func CanonicalTarNameForPath(p string) string {
-	return p // already unix-style
-}
-
 // chmodTarEntry is used to adjust the file permissions used in tar header based
 // on the platform the archival is done.
-
 func chmodTarEntry(perm os.FileMode) os.FileMode {
 	return perm // noop for unix as golang APIs provide perm bits correctly
 }

pkg/archive/archive_windows.go

@@ -21,13 +21,6 @@ func getWalkRoot(srcPath string, include string) string {
 	return filepath.Join(srcPath, include)
 }
 
-// CanonicalTarNameForPath returns platform-specific filepath
-// to canonical posix-style path for tar archival. p is relative
-// path.
-func CanonicalTarNameForPath(p string) string {
-	return filepath.ToSlash(p)
-}
-
 // chmodTarEntry is used to adjust the file permissions used in tar header based
 // on the platform the archival is done.
 func chmodTarEntry(perm os.FileMode) os.FileMode {