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package libpod
import (
"fmt"
"github.com/containers/podman/v4/libpod/define"
"github.com/containers/podman/v4/libpod/layers"
"github.com/containers/storage/pkg/archive"
)
var initInodes = map[string]bool{
"/dev": true,
"/etc/hostname": true,
"/etc/hosts": true,
"/etc/resolv.conf": true,
"/proc": true,
"/run": true,
"/run/notify": true,
"/run/.containerenv": true,
"/run/secrets": true,
define.ContainerInitPath: true,
"/sys": true,
"/etc/mtab": true,
}
// GetDiff returns the differences between the two images, layers, or containers
func (r *Runtime) GetDiff(from, to string, diffType define.DiffType) ([]archive.Change, error) {
toLayer, err := r.getLayerID(to, diffType)
if err != nil {
return nil, err
}
fromLayer := ""
if from != "" {
fromLayer, err = r.getLayerID(from, diffType)
if err != nil {
return nil, err
}
}
var rchanges []archive.Change
changes, err := r.store.Changes(fromLayer, toLayer)
if err == nil {
for _, c := range changes {
if initInodes[c.Path] {
continue
}
rchanges = append(rchanges, c)
}
}
return rchanges, err
}
// GetLayerID gets a full layer id given a full or partial id
// If the id matches a container or image, the id of the top layer is returned
// If the id matches a layer, the top layer id is returned
func (r *Runtime) getLayerID(id string, diffType define.DiffType) (string, error) {
var lastErr error
if diffType&define.DiffImage == define.DiffImage {
toImage, _, err := r.libimageRuntime.LookupImage(id, nil)
if err == nil {
return toImage.TopLayer(), nil
}
lastErr = err
}
if diffType&define.DiffContainer == define.DiffContainer {
toCtr, err := r.store.Container(id)
if err == nil {
return toCtr.LayerID, nil
}
lastErr = err
}
if diffType == define.DiffAll {
toLayer, err := layers.FullID(r.store, id)
if err == nil {
return toLayer, nil
}
lastErr = err
}
return "", fmt.Errorf("%s not found: %w", id, lastErr)
}
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