forked from mystiq/dex
74 lines
2 KiB
Go
74 lines
2 KiB
Go
// +build !windows
|
|
|
|
/*
|
|
Copyright The containerd Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package fs
|
|
|
|
import (
|
|
"bytes"
|
|
"os"
|
|
"syscall"
|
|
|
|
"github.com/containerd/continuity/sysx"
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
// detectDirDiff returns diff dir options if a directory could
|
|
// be found in the mount info for upper which is the direct
|
|
// diff with the provided lower directory
|
|
func detectDirDiff(upper, lower string) *diffDirOptions {
|
|
// TODO: get mount options for upper
|
|
// TODO: detect AUFS
|
|
// TODO: detect overlay
|
|
return nil
|
|
}
|
|
|
|
// compareSysStat returns whether the stats are equivalent,
|
|
// whether the files are considered the same file, and
|
|
// an error
|
|
func compareSysStat(s1, s2 interface{}) (bool, error) {
|
|
ls1, ok := s1.(*syscall.Stat_t)
|
|
if !ok {
|
|
return false, nil
|
|
}
|
|
ls2, ok := s2.(*syscall.Stat_t)
|
|
if !ok {
|
|
return false, nil
|
|
}
|
|
|
|
return ls1.Mode == ls2.Mode && ls1.Uid == ls2.Uid && ls1.Gid == ls2.Gid && ls1.Rdev == ls2.Rdev, nil
|
|
}
|
|
|
|
func compareCapabilities(p1, p2 string) (bool, error) {
|
|
c1, err := sysx.LGetxattr(p1, "security.capability")
|
|
if err != nil && err != sysx.ENODATA {
|
|
return false, errors.Wrapf(err, "failed to get xattr for %s", p1)
|
|
}
|
|
c2, err := sysx.LGetxattr(p2, "security.capability")
|
|
if err != nil && err != sysx.ENODATA {
|
|
return false, errors.Wrapf(err, "failed to get xattr for %s", p2)
|
|
}
|
|
return bytes.Equal(c1, c2), nil
|
|
}
|
|
|
|
func isLinked(f os.FileInfo) bool {
|
|
s, ok := f.Sys().(*syscall.Stat_t)
|
|
if !ok {
|
|
return false
|
|
}
|
|
return !f.IsDir() && s.Nlink > 1
|
|
}
|