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image_render.go
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/
image_render.go
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// Copyright 2015 The rkt Authors
//
// 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 main
import (
"encoding/json"
"io/ioutil"
"os"
"path/filepath"
"github.com/coreos/rkt/pkg/fileutil"
"github.com/coreos/rkt/pkg/uid"
"github.com/coreos/rkt/store"
"github.com/spf13/cobra"
)
var (
cmdImageRender = &cobra.Command{
Use: "render IMAGE OUTPUT_DIR",
Short: "Render a stored image to a directory with all its dependencies",
Long: `IMAGE should be a string referencing an image: either a hash or an image name.
This differs from extract in that the rendered image is in the state the app
would see when running in rkt, dependencies and all.
Note that in order to make cleaning up easy (just rm -rf), this does not use
overlayfs or any other mechanism.`,
Run: runWrapper(runImageRender),
}
flagRenderRootfsOnly bool
flagRenderOverwrite bool
)
func init() {
cmdImage.AddCommand(cmdImageRender)
cmdImageRender.Flags().BoolVar(&flagRenderRootfsOnly, "rootfs-only", false, "render rootfs only")
cmdImageRender.Flags().BoolVar(&flagRenderOverwrite, "overwrite", false, "overwrite output directory")
}
func runImageRender(cmd *cobra.Command, args []string) (exit int) {
if len(args) != 2 {
cmd.Usage()
return 1
}
outputDir := args[1]
s, err := store.NewStore(getDataDir())
if err != nil {
stderr.PrintE("cannot open store", err)
return 1
}
key, err := getStoreKeyFromAppOrHash(s, args[0])
if err != nil {
stderr.Error(err)
return 1
}
id, _, err := s.RenderTreeStore(key, false)
if err != nil {
stderr.PrintE("error rendering ACI", err)
return 1
}
if _, err := s.CheckTreeStore(id); err != nil {
stderr.Print("warning: tree cache is in a bad state. Rebuilding...")
var err error
if id, _, err = s.RenderTreeStore(key, true); err != nil {
stderr.PrintE("error rendering ACI", err)
return 1
}
}
if _, err := os.Stat(outputDir); err == nil {
if !flagRenderOverwrite {
stderr.Print("output directory exists (try --overwrite)")
return 1
}
// don't allow the user to delete the root filesystem by mistake
if outputDir == "/" {
stderr.Print("this would delete your root filesystem. Refusing.")
return 1
}
if err := os.RemoveAll(outputDir); err != nil {
stderr.PrintE("error removing existing output dir", err)
return 1
}
}
rootfsOutDir := outputDir
if !flagRenderRootfsOnly {
if err := os.MkdirAll(outputDir, 0755); err != nil {
stderr.PrintE("error creating output directory", err)
return 1
}
rootfsOutDir = filepath.Join(rootfsOutDir, "rootfs")
manifest, err := s.GetImageManifest(key)
if err != nil {
stderr.PrintE("error getting manifest", err)
return 1
}
mb, err := json.Marshal(manifest)
if err != nil {
stderr.PrintE("error marshalling image manifest", err)
return 1
}
if err := ioutil.WriteFile(filepath.Join(outputDir, "manifest"), mb, 0700); err != nil {
stderr.PrintE("error writing image manifest", err)
return 1
}
}
cachedTreePath := s.GetTreeStoreRootFS(id)
if err := fileutil.CopyTree(cachedTreePath, rootfsOutDir, uid.NewBlankUidRange()); err != nil {
stderr.PrintE("error copying ACI rootfs", err)
return 1
}
return 0
}