Created
December 1, 2016 15:32
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package main | |
import ( | |
"bytes" | |
"fmt" | |
"io/ioutil" | |
"log" | |
"os" | |
"os/exec" | |
"strings" | |
"time" | |
) | |
func mustRunGetResult(cmd string, arg ...string) string { | |
var buf bytes.Buffer | |
c := exec.Command(cmd) | |
c.Args = append(c.Args, arg...) | |
c.Stdout = &buf | |
c.Stderr = os.Stderr | |
err := c.Run() | |
if err != nil { | |
log.Fatal(err) | |
return "" | |
} | |
return strings.Trim(buf.String(), "\n\r ") | |
} | |
func commandToConst(name, command string, args []string) string { | |
data := mustRunGetResult(command, args...) | |
ret := "\n// " + name + " is the output of \"" + command + " " + strings.Join(args, " ") + "\"\n" | |
ret += "const " + name + ` = "` + data + `"` + "\n" | |
return ret | |
} | |
const destinationFile = "version/version.go" | |
func main() { | |
summary := commandToConst("GitSummary", "git", strings.Split("describe --tags --dirty --always", " ")) | |
branch := commandToConst("GitBranch", "git", strings.Split("symbolic-ref -q --short HEAD", " ")) | |
timestamp := time.Now().Format(time.UnixDate) | |
b := bytes.NewBuffer(nil) | |
fmt.Fprint(b, `// This package is auto-generated using version/cmd/generate.go | |
package version | |
// AUTO-GENERATED. DO NOT EDIT | |
// `+timestamp+"\n"+summary+branch+"\n") | |
log.Printf("Writing %s...\n", destinationFile) | |
if err := ioutil.WriteFile(destinationFile, b.Bytes(), 0644); err != nil { | |
log.Fatal(err) | |
} | |
} |
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