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//go:build linux && cgo
package idmap
import (
"errors"
"fmt"
"os"
"github.com/pkg/xattr"
"golang.org/x/sys/unix"
)
// The functions below are verbatim copies of the functions found in the internal package.
// They have been copied here due to there not being a good place for
// them in the shared package and because we have a policy not to import
// anything from internal in one of our shared packages.
// getAllXattr retrieves all extended attributes associated with a file, directory or symbolic link.
func getAllXattr(path string) (map[string]string, error) {
xattrNames, err := xattr.LList(path)
if err != nil {
// Some filesystems don't support llistxattr() for various reasons.
// Interpret this as a set of no xattrs, instead of an error.
if errors.Is(err, unix.EOPNOTSUPP) {
return nil, nil
}
return nil, fmt.Errorf("Failed getting extended attributes from %q: %w", path, err)
}
xattrs := make(map[string]string, len(xattrNames))
for _, xattrName := range xattrNames {
value, err := xattr.LGet(path, xattrName)
if err != nil {
return nil, fmt.Errorf("Failed getting %q extended attribute from %q: %w", xattrName, path, err)
}
xattrs[xattrName] = string(value)
}
return xattrs, nil
}
// getErrno checks if the Go error is a kernel errno.
func getErrno(err error) (errno error, iserrno bool) {
sysErr, ok := err.(*os.SyscallError)
if ok {
return sysErr.Err, true
}
pathErr, ok := err.(*os.PathError)
if ok {
return pathErr.Err, true
}
tmpErrno, ok := err.(unix.Errno)
if ok {
return tmpErrno, true
}
return nil, false
}
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