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d8b5c1c810
Use the symlink xattr syscall wrappers Lgetxattr, Llistxattr and Lsetxattr from x/sys/unix (introduced in golang/sys@b90f89a1e7) instead of providing own wrappers. Leave the functionality of system.Lgetxattr intact with respect to the retry with a larger buffer, but switch it to use unix.Lgetxattr. Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
36 lines
890 B
Go
36 lines
890 B
Go
package system
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import "golang.org/x/sys/unix"
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// Returns a []byte slice if the xattr is set and nil otherwise
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// Requires path and its attribute as arguments
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func Lgetxattr(path string, attr string) ([]byte, error) {
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var sz int
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// Start with a 128 length byte array
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dest := make([]byte, 128)
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sz, errno := unix.Lgetxattr(path, attr, dest)
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switch {
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case errno == unix.ENODATA:
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return nil, errno
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case errno == unix.ENOTSUP:
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return nil, errno
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case errno == unix.ERANGE:
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// 128 byte array might just not be good enough,
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// A dummy buffer is used to get the real size
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// of the xattrs on disk
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sz, errno = unix.Lgetxattr(path, attr, []byte{})
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if errno != nil {
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return nil, errno
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}
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dest = make([]byte, sz)
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sz, errno = unix.Lgetxattr(path, attr, dest)
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if errno != nil {
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return nil, errno
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}
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case errno != nil:
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return nil, errno
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}
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return dest[:sz], nil
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}
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