1 // Copyright 2015 Google Inc. All rights reserved. 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 glob 16 17 import ( 18 "io/ioutil" 19 "os" 20 "path/filepath" 21 "strings" 22 23 "github.com/google/blueprint/deptools" 24 "github.com/google/blueprint/pathtools" 25 ) 26 27 func IsGlob(glob string) bool { 28 return strings.IndexAny(glob, "*?[") >= 0 29 } 30 31 // GlobWithDepFile finds all files that match glob. It compares the list of files 32 // against the contents of fileListFile, and rewrites fileListFile if it has changed. It also 33 // writes all of the the directories it traversed as a depenencies on fileListFile to depFile. 34 // 35 // The format of glob is either path/*.ext for a single directory glob, or path/**/*.ext 36 // for a recursive glob. 37 // 38 // Returns a list of file paths, and an error. 39 func GlobWithDepFile(glob, fileListFile, depFile string, excludes []string) (files []string, err error) { 40 files, dirs, err := pathtools.GlobWithExcludes(glob, excludes) 41 if err != nil { 42 return nil, err 43 } 44 45 fileList := strings.Join(files, "\n") + "\n" 46 47 writeFileIfChanged(fileListFile, []byte(fileList), 0666) 48 deptools.WriteDepFile(depFile, fileListFile, dirs) 49 50 return 51 } 52 53 func writeFileIfChanged(filename string, data []byte, perm os.FileMode) error { 54 var isChanged bool 55 56 dir := filepath.Dir(filename) 57 err := os.MkdirAll(dir, 0777) 58 if err != nil { 59 return err 60 } 61 62 info, err := os.Stat(filename) 63 if err != nil { 64 if os.IsNotExist(err) { 65 // The file does not exist yet. 66 isChanged = true 67 } else { 68 return err 69 } 70 } else { 71 if info.Size() != int64(len(data)) { 72 isChanged = true 73 } else { 74 oldData, err := ioutil.ReadFile(filename) 75 if err != nil { 76 return err 77 } 78 79 if len(oldData) != len(data) { 80 isChanged = true 81 } else { 82 for i := range data { 83 if oldData[i] != data[i] { 84 isChanged = true 85 break 86 } 87 } 88 } 89 } 90 } 91 92 if isChanged { 93 err = ioutil.WriteFile(filename, data, perm) 94 if err != nil { 95 return err 96 } 97 } 98 99 return nil 100 } 101
