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