1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
// 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"
"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")
if _, err := osutil.RunCmd(timeout, 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,
"--depth", "1",
"--single-branch",
"--branch", branch,
dir,
}
if _, err := osutil.RunCmd(timeout, "", "git", args...); err != nil {
return "", err
}
}
if _, err := osutil.RunCmd(timeout, 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 := 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
}
|
