github.com/westcoastroms/westcoastroms-build@v0.0.0-20190928114312-2350e5a73030/build/soong/cmd/soong_env/soong_env.go (about)

     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  }