mirror of
https://github.com/containers/podman.git
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225c7ae6c9
When doing a checkpoint with --export the root file-system diff was not working as expected. Instead of getting the changes from the running container to the highest storage layer it got the changes from the highest layer to that parent's layer. For a one layer container this could mean that the complete root file-system is part of the checkpoint. With this commit this changes to use the same functionality as 'podman diff'. This actually enables to correctly diff the root file-system including tracking deleted files. This also removes the non-working helper functions from libpod/diff.go. Signed-off-by: Adrian Reber <areber@redhat.com>
80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
package libpod
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import (
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"io"
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"github.com/containers/libpod/libpod/layers"
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"github.com/containers/storage/pkg/archive"
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"github.com/pkg/errors"
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)
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var containerMounts = map[string]bool{
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"/dev": true,
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"/etc/hostname": true,
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"/etc/hosts": true,
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"/etc/resolv.conf": true,
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"/proc": true,
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"/run": true,
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"/run/.containerenv": true,
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"/run/secrets": true,
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"/sys": true,
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}
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// GetDiff returns the differences between the two images, layers, or containers
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func (r *Runtime) GetDiff(from, to string) ([]archive.Change, error) {
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toLayer, err := r.getLayerID(to)
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if err != nil {
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return nil, err
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}
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fromLayer := ""
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if from != "" {
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fromLayer, err = r.getLayerID(from)
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if err != nil {
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return nil, err
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}
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}
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var rchanges []archive.Change
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changes, err := r.store.Changes(fromLayer, toLayer)
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if err == nil {
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for _, c := range changes {
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if containerMounts[c.Path] {
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continue
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}
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rchanges = append(rchanges, c)
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}
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}
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return rchanges, err
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}
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// ApplyDiffTarStream applies the changes stored in 'diff' to the layer 'to'
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func (r *Runtime) ApplyDiffTarStream(to string, diff io.Reader) error {
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toLayer, err := r.getLayerID(to)
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if err != nil {
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return err
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}
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_, err = r.store.ApplyDiff(toLayer, diff)
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return err
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}
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// GetLayerID gets a full layer id given a full or partial id
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// If the id matches a container or image, the id of the top layer is returned
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// If the id matches a layer, the top layer id is returned
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func (r *Runtime) getLayerID(id string) (string, error) {
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var toLayer string
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toImage, err := r.imageRuntime.NewFromLocal(id)
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if err != nil {
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toCtr, err := r.store.Container(id)
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if err != nil {
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toLayer, err = layers.FullID(r.store, id)
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if err != nil {
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return "", errors.Errorf("layer, image, or container %s does not exist", id)
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}
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} else {
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toLayer = toCtr.LayerID
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}
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} else {
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toLayer = toImage.TopLayer()
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}
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return toLayer, nil
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}
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