github.com/swiftstack/ProxyFS@v0.0.0-20210203235616-4017c267d62f/version/static-data/make_static_data.go (about)

     1  // Copyright (c) 2015-2021, NVIDIA CORPORATION.
     2  // SPDX-License-Identifier: Apache-2.0
     3  
     4  package main
     5  
     6  import (
     7  	"fmt"
     8  	"os"
     9  	"os/exec"
    10  )
    11  
    12  const bytesPerLine = 16
    13  
    14  func usage() {
    15  	fmt.Println("go run make_static_data.go -?")
    16  	fmt.Println("   Prints this help text")
    17  	fmt.Println("go run make_static_data.go <packageName> <dstFile.go>")
    18  	fmt.Println("   <packageName>   is the name of the ultimate package for <dstFile.go>")
    19  	fmt.Println("   <dstFile.go>    is the name of the generated .go source file")
    20  }
    21  
    22  var bs = []byte{}
    23  
    24  func main() {
    25  	var (
    26  		gitDescribeCmd       *exec.Cmd
    27  		gitDescribeOutput    []byte
    28  		dstFile              *os.File
    29  		dstFileName          string
    30  		err                  error
    31  		packageName          string
    32  		proxyfsVersionString string
    33  	)
    34  
    35  	if (2 == len(os.Args)) && ("-?" == os.Args[1]) {
    36  		usage()
    37  		os.Exit(0)
    38  	}
    39  
    40  	if 3 != len(os.Args) {
    41  		usage()
    42  		os.Exit(1)
    43  	}
    44  
    45  	packageName = os.Args[1]
    46  	dstFileName = os.Args[2]
    47  
    48  	dstFile, err = os.Create(dstFileName)
    49  	if nil != err {
    50  		panic(err.Error())
    51  	}
    52  
    53  	_, err = dstFile.Write([]byte(fmt.Sprintf("// Code generated by \"go run make_static_data.go %v %v\" - DO NOT EDIT\n\n", packageName, dstFileName)))
    54  	if nil != err {
    55  		panic(err.Error())
    56  	}
    57  	_, err = dstFile.Write([]byte(fmt.Sprintf("package %v\n\n", packageName)))
    58  	if nil != err {
    59  		panic(err.Error())
    60  	}
    61  
    62  	proxyfsVersionString = os.Getenv("PROXYFS_VERSION")
    63  
    64  	if "" == proxyfsVersionString {
    65  		gitDescribeCmd = exec.Command("git", "describe", "--tags")
    66  
    67  		gitDescribeOutput, err = gitDescribeCmd.Output()
    68  		if nil != err {
    69  			panic(err.Error())
    70  		}
    71  
    72  		proxyfsVersionString = string(gitDescribeOutput[:len(gitDescribeOutput)-1])
    73  	}
    74  
    75  	_, err = dstFile.Write([]byte(fmt.Sprintf("const ProxyFSVersion = `%v`\n", proxyfsVersionString)))
    76  	if nil != err {
    77  		panic(err.Error())
    78  	}
    79  
    80  	err = dstFile.Close()
    81  	if nil != err {
    82  		panic(err.Error())
    83  	}
    84  
    85  	os.Exit(0)
    86  }