// Copyright 2017 Google Inc. All rights reserved.
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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 build
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import (
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"os"
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"path/filepath"
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"strings"
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)
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func absPath(ctx Context, p string) string {
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ret, err := filepath.Abs(p)
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if err != nil {
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ctx.Fatalf("Failed to get absolute path: %v", err)
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}
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return ret
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}
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// indexList finds the index of a string in a []string
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func indexList(s string, list []string) int {
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for i, l := range list {
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if l == s {
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return i
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}
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}
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return -1
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}
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// inList determines whether a string is in a []string
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func inList(s string, list []string) bool {
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return indexList(s, list) != -1
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}
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// ensureDirectoriesExist is a shortcut to os.MkdirAll, sending errors to the ctx logger.
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func ensureDirectoriesExist(ctx Context, dirs ...string) {
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for _, dir := range dirs {
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err := os.MkdirAll(dir, 0777)
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if err != nil {
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ctx.Fatalf("Error creating %s: %q\n", dir, err)
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}
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}
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}
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// ensureEmptyDirectoriesExist ensures that the given directories exist and are empty
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func ensureEmptyDirectoriesExist(ctx Context, dirs ...string) {
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// remove all the directories
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for _, dir := range dirs {
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seenErr := map[string]bool{}
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for {
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err := os.RemoveAll(dir)
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if err == nil {
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break
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}
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if pathErr, ok := err.(*os.PathError); !ok ||
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dir == pathErr.Path || seenErr[pathErr.Path] {
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ctx.Fatalf("Error removing %s: %q\n", dir, err)
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} else {
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seenErr[pathErr.Path] = true
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err = os.Chmod(filepath.Dir(pathErr.Path), 0700)
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if err != nil {
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ctx.Fatal(err)
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}
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}
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}
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}
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// recreate all the directories
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ensureDirectoriesExist(ctx, dirs...)
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}
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// ensureEmptyFileExists ensures that the containing directory exists, and the
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// specified file exists. If it doesn't exist, it will write an empty file.
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func ensureEmptyFileExists(ctx Context, file string) {
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ensureDirectoriesExist(ctx, filepath.Dir(file))
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if _, err := os.Stat(file); os.IsNotExist(err) {
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f, err := os.Create(file)
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if err != nil {
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ctx.Fatalf("Error creating %s: %q\n", file, err)
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}
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f.Close()
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} else if err != nil {
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ctx.Fatalf("Error checking %s: %q\n", file, err)
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}
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}
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// singleUnquote is similar to strconv.Unquote, but can handle multi-character strings inside single quotes.
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func singleUnquote(str string) (string, bool) {
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if len(str) < 2 || str[0] != '\'' || str[len(str)-1] != '\'' {
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return "", false
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}
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return str[1 : len(str)-1], true
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}
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// decodeKeyValue decodes a key=value string
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func decodeKeyValue(str string) (string, string, bool) {
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idx := strings.IndexRune(str, '=')
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if idx == -1 {
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return "", "", false
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}
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return str[:idx], str[idx+1:], true
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}
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