diff options
Diffstat (limited to 'vendor/github.com/containerd/continuity/fs/diff_unix.go')
-rw-r--r-- | vendor/github.com/containerd/continuity/fs/diff_unix.go | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/vendor/github.com/containerd/continuity/fs/diff_unix.go b/vendor/github.com/containerd/continuity/fs/diff_unix.go new file mode 100644 index 000000000..7913af27d --- /dev/null +++ b/vendor/github.com/containerd/continuity/fs/diff_unix.go @@ -0,0 +1,74 @@ +// +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 +} |