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 // soong_glob is the command line tool that checks if the list of files matching a glob has 16 // changed, and only updates the output file list if it has changed. It is used to optimize 17 // out build.ninja regenerations when non-matching files are added. See 18 // android/soong/common/glob.go for a longer description. 19 package main 20 21 import ( 22 "flag" 23 "fmt" 24 "os" 25 26 "android/soong/env" 27 ) 28 29 func usage() { 30 fmt.Fprintf(os.Stderr, "usage: soong_env env_file\n") 31 fmt.Fprintf(os.Stderr, "exits with success if the environment varibles in env_file match\n") 32 fmt.Fprintf(os.Stderr, "the current environment\n") 33 flag.PrintDefaults() 34 os.Exit(2) 35 } 36 37 func main() { 38 flag.Parse() 39 40 if flag.NArg() != 1 { 41 usage() 42 } 43 44 stale, err := env.StaleEnvFile(flag.Arg(0)) 45 if err != nil { 46 fmt.Fprintf(os.Stderr, "error: %s\n", err.Error()) 47 os.Exit(1) 48 } 49 50 if stale { 51 os.Exit(1) 52 } 53 54 os.Exit(0) 55 } 56
