decentral1se
56a68dfa91
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53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
//go:build linux || darwin || freebsd || netbsd
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package archive
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import (
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"errors"
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"fmt"
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"io/fs"
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"golang.org/x/sys/unix"
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)
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// lgetxattr retrieves the value of the extended attribute identified by attr
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// and associated with the given path in the file system.
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// It returns a nil slice and nil error if the xattr is not set.
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func lgetxattr(path string, attr string) ([]byte, error) {
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// Start with a 128 length byte array
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dest := make([]byte, 128)
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sz, err := unix.Lgetxattr(path, attr, dest)
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for errors.Is(err, unix.ERANGE) {
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// Buffer too small, use zero-sized buffer to get the actual size
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sz, err = unix.Lgetxattr(path, attr, []byte{})
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if err != nil {
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return nil, wrapPathError("lgetxattr", path, attr, err)
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}
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dest = make([]byte, sz)
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sz, err = unix.Lgetxattr(path, attr, dest)
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}
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if err != nil {
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if errors.Is(err, noattr) {
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return nil, nil
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}
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return nil, wrapPathError("lgetxattr", path, attr, err)
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}
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return dest[:sz], nil
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}
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// lsetxattr sets the value of the extended attribute identified by attr
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// and associated with the given path in the file system.
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func lsetxattr(path string, attr string, data []byte, flags int) error {
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return wrapPathError("lsetxattr", path, attr, unix.Lsetxattr(path, attr, data, flags))
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}
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func wrapPathError(op, path, attr string, err error) error {
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if err == nil {
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return nil
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}
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return &fs.PathError{Op: op, Path: path, Err: fmt.Errorf("xattr %q: %w", attr, err)}
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}
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