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// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
// Package git provides helper functions for working with git repositories.
package git
import (
"bytes"
"fmt"
"os"
"os/exec"
"time"
)
// Poll checkouts the specified repository/branch in dir.
// This involves fetching/resetting/cloning as necessary to recover from all possible problems.
// Returns hash of the HEAD commit in the specified branch.
func Poll(dir, repo, branch string) (string, error) {
runCmd(dir, "git", "reset", "--hard")
if _, err := runCmd(dir, "git", "fetch", "--no-tags", "--depth=", "1"); err != nil {
if err := os.RemoveAll(dir); err != nil {
return "", fmt.Errorf("failed to remove repo dir: %v", err)
}
if err := os.MkdirAll(dir, 0700); err != nil {
return "", fmt.Errorf("failed to create repo dir: %v", err)
}
args := []string{
"clone",
repo,
"--no-tags",
"--depth", "1",
"--single-branch",
"--branch", branch,
dir,
}
if _, err := runCmd("", "git", args...); err != nil {
return "", err
}
}
if _, err := runCmd(dir, "git", "checkout", branch); err != nil {
return "", err
}
return HeadCommit(dir)
}
// HeadCommit returns hash of the HEAD commit of the current branch of git repository in dir.
func HeadCommit(dir string) (string, error) {
output, err := runCmd(dir, "git", "log", "--pretty=format:'%H'", "-n", "1")
if err != nil {
return "", err
}
if len(output) != 0 && output[len(output)-1] == '\n' {
output = output[:len(output)-1]
}
if len(output) != 0 && output[0] == '\'' && output[len(output)-1] == '\'' {
output = output[1 : len(output)-1]
}
if len(output) != 40 {
return "", fmt.Errorf("unexpected git log output, want commit hash: %q", output)
}
return string(output), nil
}
func runCmd(dir, bin string, args ...string) ([]byte, error) {
output := new(bytes.Buffer)
cmd := exec.Command(bin, args...)
cmd.Dir = dir
cmd.Stdout = output
cmd.Stderr = output
if err := cmd.Start(); err != nil {
return nil, fmt.Errorf("failed to start %v %+v: %v", bin, args, err)
}
done := make(chan bool)
go func() {
select {
case <-time.After(time.Hour):
cmd.Process.Kill()
case <-done:
}
}()
defer close(done)
if err := cmd.Wait(); err != nil {
return nil, fmt.Errorf("failed to run %v %+v: %v\n%v", bin, args, err, output.String())
}
return output.Bytes(), nil
}
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