123 lines
3.2 KiB
Go
123 lines
3.2 KiB
Go
package gitutils
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"github.com/docker/docker/pkg/symlink"
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"github.com/docker/docker/pkg/urlutil"
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"github.com/pkg/errors"
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)
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// Clone clones a repository into a newly created directory which
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// will be under "docker-build-git"
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func Clone(remoteURL string) (string, error) {
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if !urlutil.IsGitTransport(remoteURL) {
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remoteURL = "https://" + remoteURL
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}
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root, err := ioutil.TempDir("", "docker-build-git")
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if err != nil {
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return "", err
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}
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u, err := url.Parse(remoteURL)
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if err != nil {
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return "", err
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}
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if out, err := gitWithinDir(root, "init"); err != nil {
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return "", errors.Wrapf(err, "failed to init repo at %s: %s", root, out)
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}
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ref, subdir := getRefAndSubdir(u.Fragment)
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fetch := fetchArgs(u, ref)
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u.Fragment = ""
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// Add origin remote for compatibility with previous implementation that
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// used "git clone" and also to make sure local refs are created for branches
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if out, err := gitWithinDir(root, "remote", "add", "origin", u.String()); err != nil {
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return "", errors.Wrapf(err, "failed add origin repo at %s: %s", u.String(), out)
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}
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if output, err := gitWithinDir(root, fetch...); err != nil {
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return "", errors.Wrapf(err, "error fetching: %s", output)
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}
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return checkoutGit(root, ref, subdir)
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}
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func getRefAndSubdir(fragment string) (ref string, subdir string) {
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refAndDir := strings.SplitN(fragment, ":", 2)
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ref = "master"
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if len(refAndDir[0]) != 0 {
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ref = refAndDir[0]
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}
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if len(refAndDir) > 1 && len(refAndDir[1]) != 0 {
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subdir = refAndDir[1]
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}
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return
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}
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func fetchArgs(remoteURL *url.URL, ref string) []string {
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args := []string{"fetch", "--recurse-submodules=yes"}
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shallow := true
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if strings.HasPrefix(remoteURL.Scheme, "http") {
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res, err := http.Head(fmt.Sprintf("%s/info/refs?service=git-upload-pack", remoteURL))
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if err != nil || res.Header.Get("Content-Type") != "application/x-git-upload-pack-advertisement" {
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shallow = false
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}
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}
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if shallow {
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args = append(args, "--depth", "1")
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}
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return append(args, "origin", ref)
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}
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func checkoutGit(root, ref, subdir string) (string, error) {
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// Try checking out by ref name first. This will work on branches and sets
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// .git/HEAD to the current branch name
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if output, err := gitWithinDir(root, "checkout", ref); err != nil {
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// If checking out by branch name fails check out the last fetched ref
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if _, err2 := gitWithinDir(root, "checkout", "FETCH_HEAD"); err2 != nil {
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return "", errors.Wrapf(err, "error checking out %s: %s", ref, output)
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}
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}
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if subdir != "" {
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newCtx, err := symlink.FollowSymlinkInScope(filepath.Join(root, subdir), root)
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if err != nil {
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return "", errors.Wrapf(err, "error setting git context, %q not within git root", subdir)
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}
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fi, err := os.Stat(newCtx)
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if err != nil {
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return "", err
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}
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if !fi.IsDir() {
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return "", errors.Errorf("error setting git context, not a directory: %s", newCtx)
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}
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root = newCtx
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}
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return root, nil
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}
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func gitWithinDir(dir string, args ...string) ([]byte, error) {
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a := []string{"--work-tree", dir, "--git-dir", filepath.Join(dir, ".git")}
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return git(append(a, args...)...)
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}
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func git(args ...string) ([]byte, error) {
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return exec.Command("git", args...).CombinedOutput()
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}
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