mirror of
https://github.com/clearlinux/rkt.git
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78 lines
2.6 KiB
Go
78 lines
2.6 KiB
Go
// Copyright 2015 The rkt Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package aci
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import (
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"fmt"
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ptar "github.com/coreos/rkt/pkg/tar"
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"github.com/coreos/rkt/Godeps/_workspace/src/github.com/appc/spec/pkg/acirenderer"
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"github.com/coreos/rkt/Godeps/_workspace/src/github.com/appc/spec/schema/types"
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)
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// Given an imageID, start with the matching image available in the store,
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// build its dependency list and render it inside dir
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func RenderACIWithImageID(imageID types.Hash, dir string, ap acirenderer.ACIRegistry) error {
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renderedACI, err := acirenderer.GetRenderedACIWithImageID(imageID, ap)
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if err != nil {
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return err
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}
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return renderImage(renderedACI, dir, ap)
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}
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// Given an image app name and optional labels, get the best matching image
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// available in the store, build its dependency list and render it inside dir
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func RenderACI(name types.ACName, labels types.Labels, dir string, ap acirenderer.ACIRegistry) error {
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renderedACI, err := acirenderer.GetRenderedACI(name, labels, ap)
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if err != nil {
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return err
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}
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return renderImage(renderedACI, dir, ap)
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}
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// Given an already populated dependency list, it will extract, under the provided
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// directory, the rendered ACI
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func RenderACIFromList(imgs acirenderer.Images, dir string, ap acirenderer.ACIProvider) error {
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renderedACI, err := acirenderer.GetRenderedACIFromList(imgs, ap)
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if err != nil {
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return err
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}
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return renderImage(renderedACI, dir, ap)
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}
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// Given a RenderedACI, it will extract, under the provided directory, the
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// needed files from the right source ACI.
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// The manifest will be extracted from the upper ACI.
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// No file overwriting is done as it should usually be called
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// providing an empty directory.
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func renderImage(renderedACI acirenderer.RenderedACI, dir string, ap acirenderer.ACIProvider) error {
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for _, ra := range renderedACI {
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rs, err := ap.ReadStream(ra.Key)
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if err != nil {
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return err
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}
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// Overwrite is not needed. If a file needs to be overwritten then the renderedACI builder has a bug
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if err := ptar.ExtractTar(rs, dir, false, ra.FileMap); err != nil {
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rs.Close()
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return fmt.Errorf("error extracting ACI: %v", err)
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}
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rs.Close()
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}
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return nil
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}
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