Sebastiaan van Stijn
1ff261d38e
- pkg/system: return even richer xattr errors full diff: https://github.com/moby/moby/compare/v25.0.0-rc.1...v25.0.1 Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
package system // import "github.com/docker/docker/pkg/system"
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import (
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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 will 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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sysErr := func(err error) ([]byte, error) {
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return nil, &XattrError{Op: "lgetxattr", Attr: attr, Path: path, Err: err}
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}
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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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for errno == unix.ERANGE {
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// Buffer too small, use zero-sized buffer to get the actual size
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sz, errno = unix.Lgetxattr(path, attr, []byte{})
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if errno != nil {
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return sysErr(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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}
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switch {
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case errno == unix.ENODATA:
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return nil, nil
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case errno != nil:
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return sysErr(errno)
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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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err := unix.Lsetxattr(path, attr, data, flags)
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if err != nil {
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return &XattrError{Op: "lsetxattr", Attr: attr, Path: path, Err: err}
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}
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return nil
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}
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