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utils.go
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utils.go
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package main
/*
Copyright (C) 2014,2015 Kouhei Maeda <mkouhei@palmtb.net>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
)
func bldDir() string {
// mkdir build directory
f, err := ioutil.TempDir("", prefix)
if err != nil {
log.Fatal(err)
}
return f
}
func cleanDir(targetDir string) error {
// cleanup build directory
if err := os.RemoveAll(targetDir); err != nil {
return err
}
return nil
}
func cleanDirs() {
// cleanup all build directories
lists, _ := filepath.Glob(fmt.Sprintf("/tmp/%s*", prefix))
for _, l := range lists {
cleanDir(l)
}
}
func suppressError(m string, omitFlag bool) {
// suppress error message
switch {
case strings.HasPrefix(m, "go install: no install location"):
case omitFlag && strings.Contains(m, "declared and not used"):
default:
fmt.Printf("[error] %s", m)
}
}
func runCmd(printFlag, omitFlag bool, command string, args ...string) (string, error) {
// execute command
cmd := exec.Command(command, args...)
var stdout bytes.Buffer
var stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
err := cmd.Run()
if err != nil {
suppressError(stderr.String(), omitFlag)
return stderr.String(), err
}
if printFlag {
fmt.Print(stdout.String())
}
return stdout.String(), nil
}
func compare(A, B []string) []string {
// compare two []string slices
m := make(map[string]int)
for _, b := range B {
m[b]++
}
var ret []string
for _, a := range A {
if m[a] > 0 {
m[a]--
continue
}
ret = append(ret, a)
}
return ret
}
func (e *env) logger(facility, msg string, err error) {
if e.debug {
if err == nil {
log.Printf("[info] %s: %s\n", facility, msg)
} else {
log.Printf("[error] %s: %s %v\n", facility, msg, err)
}
}
}
func goVersion(goVer string) string {
// get `go version'
if goVer != "" {
return goVer
}
cmd := "go"
args := []string{"version"}
msg, _ := runCmd(false, false, cmd, args...)
return msg
}