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74 lines
2.0 KiB
74 lines
2.0 KiB
// +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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