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Handle extended length paths

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aneesh-n 2024-08-05 16:03:43 -06:00
parent 85639f5159
commit 71632a8197
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GPG key ID: 6F5A52831C046F44
1 changed files with 16 additions and 7 deletions
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23
internal/restic/node_windows.go
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@ -38,6 +38,12 @@ var (
eaSupportedVolumesMap = sync.Map{}
)
const (
extendedPathPrefix = `\\?\`
uncPathPrefix = `\\?\UNC\`
globalRootPrefix = `\\?\GLOBALROOT\`
)
// mknod is not supported on Windows.
func mknod(_ string, _ uint32, _ uint64) (err error) {
return errors.New("device nodes cannot be created on windows")
@ -371,7 +377,7 @@ func (node *Node) fillGenericAttributes(path string, fi os.FileInfo, stat *statT
// Security descriptors are not supported for root volume paths.
// Though file attributes and created time are supported for root volume paths,
// we ignore them and we do not want to replace them during every restore.
allowExtended, err = checkAndStoreEASupport(filepath.VolumeName(path))
allowExtended, err = checkAndStoreEASupport(path)
if err != nil {
return false, err
}
@ -381,7 +387,7 @@ func (node *Node) fillGenericAttributes(path string, fi os.FileInfo, stat *statT
var sd *[]byte
if node.Type == "file" || node.Type == "dir" {
// Check EA support and get security descriptor for file/dir only
allowExtended, err = checkAndStoreEASupport(filepath.VolumeName(path))
allowExtended, err = checkAndStoreEASupport(path)
if err != nil {
return false, err
}
@ -401,11 +407,14 @@ func (node *Node) fillGenericAttributes(path string, fi os.FileInfo, stat *statT
// checkAndStoreEASupport checks if the volume of the path supports extended attributes and stores the result in a map
// If the result is already in the map, it returns the result from the map.
func checkAndStoreEASupport(path string) (isEASupportedVolume bool, err error) {
// Check if it's a UNC path and format it correctly
if strings.HasPrefix(path, `\\?\UNC\`) {
// Convert \\?\UNC\ path to standard path to get the volume name correctly
path = `\\` + strings.TrimPrefix(path, `\\?\UNC\`)
} else if strings.HasPrefix(path, `\\?\GLOBALROOT`) {
// Check if it's an extended length path
if strings.HasPrefix(path, uncPathPrefix) {
// Convert \\?\UNC\ extended path to standard path to get the volume name correctly
path = `\\` + path[len(uncPathPrefix):]
} else if strings.HasPrefix(path, extendedPathPrefix) {
//Extended length path prefix needs to be trimmed to get the volume name correctly
path = path[len(extendedPathPrefix):]
} else if strings.HasPrefix(path, globalRootPrefix) {
// EAs are not supported for \\?\GLOBALROOT i.e. VSS snapshots
return false, nil
} else {