108 lines
3 KiB
Go
108 lines
3 KiB
Go
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// +build linux darwin
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package continuity
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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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"sort"
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"github.com/stevvooe/continuity/sysx"
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)
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// Lchmod changes the mode of an file not following symlinks.
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func (d *driver) Lchmod(path string, mode os.FileMode) (err error) {
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if !filepath.IsAbs(path) {
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path, err = filepath.Abs(path)
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if err != nil {
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return
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}
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}
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return sysx.Fchmodat(0, path, uint32(mode), sysx.AtSymlinkNofollow)
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}
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// Getxattr returns all of the extended attributes for the file at path p.
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func (d *driver) Getxattr(p string) (map[string][]byte, error) {
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xattrs, err := sysx.Listxattr(p)
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if err != nil {
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return nil, fmt.Errorf("listing %s xattrs: %v", p, err)
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}
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sort.Strings(xattrs)
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m := make(map[string][]byte, len(xattrs))
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for _, attr := range xattrs {
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value, err := sysx.Getxattr(p, attr)
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if err != nil {
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return nil, fmt.Errorf("getting %q xattr on %s: %v", attr, p, err)
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}
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// NOTE(stevvooe): This append/copy tricky relies on unique
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// xattrs. Break this out into an alloc/copy if xattrs are no
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// longer unique.
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m[attr] = append(m[attr], value...)
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}
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return m, nil
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}
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// Setxattr sets all of the extended attributes on file at path, following
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// any symbolic links, if necessary. All attributes on the target are
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// replaced by the values from attr. If the operation fails to set any
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// attribute, those already applied will not be rolled back.
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func (d *driver) Setxattr(path string, attrMap map[string][]byte) error {
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for attr, value := range attrMap {
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if err := sysx.Setxattr(path, attr, value, 0); err != nil {
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return fmt.Errorf("error setting xattr %q on %s: %v", attr, path, err)
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}
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}
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return nil
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}
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// LGetxattr returns all of the extended attributes for the file at path p
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// not following symbolic links.
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func (d *driver) LGetxattr(p string) (map[string][]byte, error) {
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xattrs, err := sysx.LListxattr(p)
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if err != nil {
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return nil, fmt.Errorf("listing %s xattrs: %v", p, err)
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}
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sort.Strings(xattrs)
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m := make(map[string][]byte, len(xattrs))
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for _, attr := range xattrs {
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value, err := sysx.LGetxattr(p, attr)
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if err != nil {
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return nil, fmt.Errorf("getting %q xattr on %s: %v", attr, p, err)
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}
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// NOTE(stevvooe): This append/copy tricky relies on unique
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// xattrs. Break this out into an alloc/copy if xattrs are no
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// longer unique.
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m[attr] = append(m[attr], value...)
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}
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return m, nil
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}
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// LSetxattr sets all of the extended attributes on file at path, not
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// following any symbolic links. All attributes on the target are
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// replaced by the values from attr. If the operation fails to set any
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// attribute, those already applied will not be rolled back.
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func (d *driver) LSetxattr(path string, attrMap map[string][]byte) error {
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for attr, value := range attrMap {
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if err := sysx.LSetxattr(path, attr, value, 0); err != nil {
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return fmt.Errorf("error setting xattr %q on %s: %v", attr, path, err)
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}
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}
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return nil
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}
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func (d *driver) DeviceInfo(fi os.FileInfo) (maj uint64, min uint64, err error) {
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return deviceInfo(fi)
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}
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