forked from mgoltzsche/ctnr
/
commit.go
107 lines (99 loc) · 2.59 KB
/
commit.go
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// Copyright © 2017 Max Goltzsche
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"fmt"
"path/filepath"
"github.com/mgoltzsche/cntnr/image"
"github.com/opencontainers/go-digest"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
var (
commitCmd = &cobra.Command{
Use: "commit [flags] CONTAINER [IMAGENAME]",
Short: "Creates a new image from the current container",
Long: `Creates a new image from the current container.`,
Run: wrapRun(runCommit),
}
flagAuthor string
flagComment string
)
func init() {
commitCmd.Flags().StringVarP(&flagAuthor, "author", "a", "", "Sets the new layer's author")
commitCmd.Flags().StringVarP(&flagComment, "comment", "c", "", "Sets the new layer's comment")
}
func runCommit(cmd *cobra.Command, args []string) (err error) {
if len(args) < 1 || len(args) > 2 {
return usageError("Invalid argument")
}
bundleId := args[0]
b, err := store.Bundle(bundleId)
if err != nil {
return
}
lockedBundle, err := b.Lock()
if err != nil {
return
}
defer lockedBundle.Close()
lockedStore, err := openImageStore()
if err != nil {
return
}
spec, err := lockedBundle.Spec()
if err != nil {
return
}
if spec.Root == nil {
return errors.Errorf("bundle %q has no root path", bundleId)
}
rootfs := filepath.Join(b.Dir(), spec.Root.Path)
src, err := lockedStore.NewLayerSource(rootfs)
if err != nil {
return
}
defer src.Close()
// Try to create new image
var (
imgId digest.Digest
img image.Image
)
if flagComment == "" {
flagComment = "commit"
}
if img, err = lockedStore.AddImageLayer(src, lockedBundle.Image(), flagAuthor, flagComment); err == nil {
imgId = img.ID()
err = lockedBundle.SetParentImageId(&imgId)
} else if image.IsEmptyLayerDiff(err) {
bImgId := lockedBundle.Image()
if bImgId == nil {
panic("bundle has no parent but provides no layer contents")
}
imgId = *bImgId
err = nil
}
// Tag image
if err == nil {
if len(args) > 1 {
for _, tag := range args[1:] {
if _, err = lockedStore.TagImage(imgId, tag); err != nil {
return
}
}
}
fmt.Println(imgId)
}
return
}