67c99255cc
Replace the individual matches and deps return values with a GlobResult struct. Use the GlobResult to create the file list file in GlobWithDepFile (used by bpglob) and in the glob singleton, as the generated files must match exactly so that soong_build is not rerun. Bug: 159845846 Test: glob_test.go Change-Id: I2159cc9d85f388073198eac7456e5bf43e813096
130 lines
3.4 KiB
Go
130 lines
3.4 KiB
Go
// Copyright 2015 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 blueprint
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import (
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"crypto/md5"
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"fmt"
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"sort"
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"strings"
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"github.com/google/blueprint/pathtools"
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)
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type GlobPath struct {
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pathtools.GlobResult
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Name string
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}
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func verifyGlob(fileName, pattern string, excludes []string, g GlobPath) {
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if pattern != g.Pattern {
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panic(fmt.Errorf("Mismatched patterns %q and %q for glob file %q", pattern, g.Pattern, fileName))
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}
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if len(excludes) != len(g.Excludes) {
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panic(fmt.Errorf("Mismatched excludes %v and %v for glob file %q", excludes, g.Excludes, fileName))
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}
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for i := range excludes {
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if g.Excludes[i] != excludes[i] {
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panic(fmt.Errorf("Mismatched excludes %v and %v for glob file %q", excludes, g.Excludes, fileName))
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}
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}
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}
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func (c *Context) glob(pattern string, excludes []string) ([]string, error) {
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fileName := globToFileName(pattern, excludes)
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// Try to get existing glob from the stored results
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c.globLock.Lock()
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g, exists := c.globs[fileName]
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c.globLock.Unlock()
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if exists {
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// Glob has already been done, double check it is identical
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verifyGlob(fileName, pattern, excludes, g)
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// Return a copy so that modifications don't affect the cached value.
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return append([]string(nil), g.Matches...), nil
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}
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// Get a globbed file list
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result, err := c.fs.Glob(pattern, excludes, pathtools.FollowSymlinks)
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if err != nil {
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return nil, err
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}
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// Store the results
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c.globLock.Lock()
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if g, exists = c.globs[fileName]; !exists {
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c.globs[fileName] = GlobPath{result, fileName}
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}
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c.globLock.Unlock()
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if exists {
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// Getting the list raced with another goroutine, throw away the results and use theirs
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verifyGlob(fileName, pattern, excludes, g)
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// Return a copy so that modifications don't affect the cached value.
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return append([]string(nil), g.Matches...), nil
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}
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// Return a copy so that modifications don't affect the cached value.
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return append([]string(nil), result.Matches...), nil
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}
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func (c *Context) Globs() []GlobPath {
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fileNames := make([]string, 0, len(c.globs))
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for k := range c.globs {
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fileNames = append(fileNames, k)
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}
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sort.Strings(fileNames)
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globs := make([]GlobPath, len(fileNames))
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for i, fileName := range fileNames {
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globs[i] = c.globs[fileName]
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}
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return globs
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}
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func globToString(pattern string) string {
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ret := ""
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for _, c := range pattern {
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switch {
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case c >= 'a' && c <= 'z',
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c >= 'A' && c <= 'Z',
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c >= '0' && c <= '9',
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c == '_', c == '-', c == '/':
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ret += string(c)
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default:
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ret += "_"
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}
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}
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return ret
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}
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func globToFileName(pattern string, excludes []string) string {
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name := globToString(pattern)
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excludeName := ""
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for _, e := range excludes {
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excludeName += "__" + globToString(e)
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}
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// Prevent file names from reaching ninja's path component limit
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if strings.Count(name, "/")+strings.Count(excludeName, "/") > 30 {
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excludeName = fmt.Sprintf("___%x", md5.Sum([]byte(excludeName)))
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}
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return name + excludeName + ".glob"
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}
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