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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 (
"fmt"
"os"
"strings"
"time"
"github.com/google/syzkaller/pkg/osutil"
)
const timeout = time.Hour // timeout for all git invocations
// 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) {
osutil.RunCmd(timeout, dir, "git", "reset", "--hard")
origin, err := osutil.RunCmd(timeout, dir, "git", "remote", "get-url", "origin")
if err != nil || strings.TrimSpace(string(origin)) != repo {
// The repo is here, but it has wrong origin (e.g. repo in config has changed), re-clone.
if err := clone(dir, repo, branch); err != nil {
return "", err
}
}
// Use origin/branch for the case the branch was force-pushed,
// in such case branch is not the same is origin/branch and we will
// stuck with the local version forever (git checkout won't fail).
if _, err := osutil.RunCmd(timeout, dir, "git", "checkout", "origin/"+branch); err != nil {
// No such branch (e.g. branch in config has changed), re-clone.
if err := clone(dir, repo, branch); err != nil {
return "", err
}
}
if _, err := osutil.RunCmd(timeout, dir, "git", "fetch", "--no-tags"); err != nil {
// Something else is wrong, re-clone.
if err := clone(dir, repo, branch); err != nil {
return "", err
}
}
if _, err := osutil.RunCmd(timeout, dir, "git", "checkout", "origin/"+branch); err != nil {
return "", err
}
return HeadCommit(dir)
}
func clone(dir, repo, branch string) error {
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,
"--single-branch",
"--branch", branch,
dir,
}
_, err := osutil.RunCmd(timeout, "", "git", args...)
return err
}
// HeadCommit returns hash of the HEAD commit of the current branch of git repository in dir.
func HeadCommit(dir string) (string, error) {
output, err := osutil.RunCmd(timeout, 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
}
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