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https://github.com/containers/podman.git
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22c8270135
Current these commands only check if a container exists in libpod. With this fix, the commands will also check if they are in containers/storage. This allows users to look at differences within a buildah or CRI-O container. Currently buildah diff does not exists, so this helps out in that situation as well as in CRI-O since the cri does not implement a diff command. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
package libpod
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import (
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"io"
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"github.com/containers/podman/v2/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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return toImage.TopLayer(), nil
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}
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targetID, err := r.store.Lookup(id)
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if err != nil {
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targetID = id
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}
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toCtr, err := r.store.Container(targetID)
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if err != nil {
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toLayer, err = layers.FullID(r.store, targetID)
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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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return toLayer, nil
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}
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