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Update overlay2 to use naive diff for changes

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The archive changes function is not implemented correctly
to handle opaque directories.

Signed-off-by: Derek McGowan <derek@mcgstyle.net>
This commit is contained in:
Derek McGowan 2018-06-19 15:56:41 -07:00
parent de0abf4315
commit ac5d363e67
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GPG key ID: F58C5D0A4405ACDB
3 changed files with 2 additions and 40 deletions
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13
daemon/graphdriver/overlay2/overlay.go
View file

@ -754,16 +754,5 @@ func (d *Driver) Diff(id, parent string) (io.ReadCloser, error) {
// Changes produces a list of changes between the specified layer and its // Changes produces a list of changes between the specified layer and its
// parent layer. If parent is "", then all changes will be ADD changes. // parent layer. If parent is "", then all changes will be ADD changes.
func (d *Driver) Changes(id, parent string) ([]archive.Change, error) { func (d *Driver) Changes(id, parent string) ([]archive.Change, error) {
if useNaiveDiff(d.home) || !d.isParent(id, parent) { return d.naiveDiff.Changes(id, parent)
return d.naiveDiff.Changes(id, parent)
}
// Overlay doesn't have snapshots, so we need to get changes from all parent
// layers.
diffPath := d.getDiffPath(id)
layers, err := d.getLowerDirs(id)
if err != nil {
return nil, err
}
return archive.OverlayChanges(layers, diffPath)
} }

2
daemon/graphdriver/overlay2/overlay_test.go
View file

@ -62,7 +62,7 @@ func TestOverlayDiffApply10Files(t *testing.T) {
} }
func TestOverlayChanges(t *testing.T) { func TestOverlayChanges(t *testing.T) {
skipIfNaive(t) t.Skipf("Cannot run test with naive change algorithm")
graphtest.DriverTestChanges(t, driverName) graphtest.DriverTestChanges(t, driverName)
} }

27
pkg/archive/changes_linux.go
View file

@ -284,30 +284,3 @@ func clen(n []byte) int {
} }
return len(n) return len(n)
} }
// OverlayChanges walks the path rw and determines changes for the files in the path,
// with respect to the parent layers
func OverlayChanges(layers []string, rw string) ([]Change, error) {
return changes(layers, rw, overlayDeletedFile, nil)
}
func overlayDeletedFile(root, path string, fi os.FileInfo) (string, error) {
if fi.Mode()&os.ModeCharDevice != 0 {
s := fi.Sys().(*syscall.Stat_t)
if unix.Major(uint64(s.Rdev)) == 0 && unix.Minor(uint64(s.Rdev)) == 0 { // nolint: unconvert
return path, nil
}
}
if fi.Mode()&os.ModeDir != 0 {
opaque, err := system.Lgetxattr(filepath.Join(root, path), "trusted.overlay.opaque")
if err != nil {
return "", err
}
if len(opaque) == 1 && opaque[0] == 'y' {
return path, nil
}
}
return "", nil
}