github.com/stackdocker/rkt@v0.10.1-0.20151109095037-1aa827478248/pkg/aci/render.go (about) 1 // Copyright 2015 The rkt Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package aci 16 17 import ( 18 "fmt" 19 20 "github.com/coreos/rkt/pkg/uid" 21 22 ptar "github.com/coreos/rkt/pkg/tar" 23 24 "github.com/coreos/rkt/Godeps/_workspace/src/github.com/appc/spec/pkg/acirenderer" 25 "github.com/coreos/rkt/Godeps/_workspace/src/github.com/appc/spec/schema/types" 26 ) 27 28 // Given an imageID, start with the matching image available in the store, 29 // build its dependency list and render it inside dir 30 func RenderACIWithImageID(imageID types.Hash, dir string, ap acirenderer.ACIRegistry, uidRange *uid.UidRange) error { 31 renderedACI, err := acirenderer.GetRenderedACIWithImageID(imageID, ap) 32 if err != nil { 33 return err 34 } 35 return renderImage(renderedACI, dir, ap, uidRange) 36 } 37 38 // Given an image app name and optional labels, get the best matching image 39 // available in the store, build its dependency list and render it inside dir 40 func RenderACI(name types.ACIdentifier, labels types.Labels, dir string, ap acirenderer.ACIRegistry, uidRange *uid.UidRange) error { 41 renderedACI, err := acirenderer.GetRenderedACI(name, labels, ap) 42 if err != nil { 43 return err 44 } 45 return renderImage(renderedACI, dir, ap, uidRange) 46 } 47 48 // Given an already populated dependency list, it will extract, under the provided 49 // directory, the rendered ACI 50 func RenderACIFromList(imgs acirenderer.Images, dir string, ap acirenderer.ACIProvider, uidRange *uid.UidRange) error { 51 renderedACI, err := acirenderer.GetRenderedACIFromList(imgs, ap) 52 if err != nil { 53 return err 54 } 55 return renderImage(renderedACI, dir, ap, uidRange) 56 } 57 58 // Given a RenderedACI, it will extract, under the provided directory, the 59 // needed files from the right source ACI. 60 // The manifest will be extracted from the upper ACI. 61 // No file overwriting is done as it should usually be called 62 // providing an empty directory. 63 func renderImage(renderedACI acirenderer.RenderedACI, dir string, ap acirenderer.ACIProvider, uidRange *uid.UidRange) error { 64 for _, ra := range renderedACI { 65 rs, err := ap.ReadStream(ra.Key) 66 if err != nil { 67 return err 68 } 69 70 // Overwrite is not needed. If a file needs to be overwritten then the renderedACI builder has a bug 71 if err := ptar.ExtractTar(rs, dir, false, uidRange, ra.FileMap); err != nil { 72 rs.Close() 73 return fmt.Errorf("error extracting ACI: %v", err) 74 } 75 rs.Close() 76 } 77 78 return nil 79 }