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git.go
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git.go
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package git
import (
"bytes"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
)
func pull(dir string) error {
cmd := exec.Command("git", "pull")
cmd.Dir = dir
return cmd.Run()
}
func HeadHash(dir string) (string, error) {
cmd := exec.Command(
"git",
"rev-parse",
"HEAD")
cmd.Dir = dir
r, err := cmd.StdoutPipe()
if err != nil {
return "", err
}
defer r.Close()
if err := cmd.Start(); err != nil {
return "", err
}
var buf bytes.Buffer
if _, err := io.Copy(&buf, r); err != nil {
return "", err
}
return strings.TrimSpace(buf.String()), cmd.Wait()
}
func Pull(dir string) (string, error) {
if err := pull(dir); err != nil {
return "", err
}
return HeadHash(dir)
}
func Clone(dir, url string) (string, error) {
par, rep := filepath.Split(dir)
cmd := exec.Command(
"git",
"clone",
url,
rep)
cmd.Dir = par
cmd.Stdout = ioutil.Discard
if err := cmd.Run(); err != nil {
return "", err
}
return HeadHash(dir)
}
func exists(path string) bool {
if _, err := os.Stat(path); err != nil {
return false
}
return true
}
func PullOrClone(dir, url string) (string, error) {
if exists(dir) {
return Pull(dir)
}
return Clone(dir, url)
}