utils: move git functions to pkg/gitutils

Signed-off-by: Tibor Vass <tibor@docker.com>
This commit is contained in:
Tibor Vass 2015-12-14 11:17:51 +01:00
parent 244162287a
commit c999f3afa3
2 changed files with 286 additions and 0 deletions

100
gitutils/gitutils.go Normal file
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package gitutils
import (
"fmt"
"io/ioutil"
"net/http"
"net/url"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/docker/docker/pkg/symlink"
"github.com/docker/docker/pkg/urlutil"
)
// Clone clones a repository into a newly created directory which
// will be under "docker-build-git"
func Clone(remoteURL string) (string, error) {
if !urlutil.IsGitTransport(remoteURL) {
remoteURL = "https://" + remoteURL
}
root, err := ioutil.TempDir("", "docker-build-git")
if err != nil {
return "", err
}
u, err := url.Parse(remoteURL)
if err != nil {
return "", err
}
fragment := u.Fragment
clone := cloneArgs(u, root)
if output, err := git(clone...); err != nil {
return "", fmt.Errorf("Error trying to use git: %s (%s)", err, output)
}
return checkoutGit(fragment, root)
}
func cloneArgs(remoteURL *url.URL, root string) []string {
args := []string{"clone", "--recursive"}
shallow := len(remoteURL.Fragment) == 0
if shallow && strings.HasPrefix(remoteURL.Scheme, "http") {
res, err := http.Head(fmt.Sprintf("%s/info/refs?service=git-upload-pack", remoteURL))
if err != nil || res.Header.Get("Content-Type") != "application/x-git-upload-pack-advertisement" {
shallow = false
}
}
if shallow {
args = append(args, "--depth", "1")
}
if remoteURL.Fragment != "" {
remoteURL.Fragment = ""
}
return append(args, remoteURL.String(), root)
}
func checkoutGit(fragment, root string) (string, error) {
refAndDir := strings.SplitN(fragment, ":", 2)
if len(refAndDir[0]) != 0 {
if output, err := gitWithinDir(root, "checkout", refAndDir[0]); err != nil {
return "", fmt.Errorf("Error trying to use git: %s (%s)", err, output)
}
}
if len(refAndDir) > 1 && len(refAndDir[1]) != 0 {
newCtx, err := symlink.FollowSymlinkInScope(filepath.Join(root, refAndDir[1]), root)
if err != nil {
return "", fmt.Errorf("Error setting git context, %q not within git root: %s", refAndDir[1], err)
}
fi, err := os.Stat(newCtx)
if err != nil {
return "", err
}
if !fi.IsDir() {
return "", fmt.Errorf("Error setting git context, not a directory: %s", newCtx)
}
root = newCtx
}
return root, nil
}
func gitWithinDir(dir string, args ...string) ([]byte, error) {
a := []string{"--work-tree", dir, "--git-dir", filepath.Join(dir, ".git")}
return git(append(a, args...)...)
}
func git(args ...string) ([]byte, error) {
return exec.Command("git", args...).CombinedOutput()
}

186
gitutils/gitutils_test.go Normal file
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package gitutils
import (
"fmt"
"io/ioutil"
"net/http"
"net/http/httptest"
"net/url"
"os"
"path/filepath"
"reflect"
"testing"
)
func TestCloneArgsSmartHttp(t *testing.T) {
mux := http.NewServeMux()
server := httptest.NewServer(mux)
serverURL, _ := url.Parse(server.URL)
serverURL.Path = "/repo.git"
gitURL := serverURL.String()
mux.HandleFunc("/repo.git/info/refs", func(w http.ResponseWriter, r *http.Request) {
q := r.URL.Query().Get("service")
w.Header().Set("Content-Type", fmt.Sprintf("application/x-%s-advertisement", q))
})
args := cloneArgs(serverURL, "/tmp")
exp := []string{"clone", "--recursive", "--depth", "1", gitURL, "/tmp"}
if !reflect.DeepEqual(args, exp) {
t.Fatalf("Expected %v, got %v", exp, args)
}
}
func TestCloneArgsDumbHttp(t *testing.T) {
mux := http.NewServeMux()
server := httptest.NewServer(mux)
serverURL, _ := url.Parse(server.URL)
serverURL.Path = "/repo.git"
gitURL := serverURL.String()
mux.HandleFunc("/repo.git/info/refs", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain")
})
args := cloneArgs(serverURL, "/tmp")
exp := []string{"clone", "--recursive", gitURL, "/tmp"}
if !reflect.DeepEqual(args, exp) {
t.Fatalf("Expected %v, got %v", exp, args)
}
}
func TestCloneArgsGit(t *testing.T) {
u, _ := url.Parse("git://github.com/docker/docker")
args := cloneArgs(u, "/tmp")
exp := []string{"clone", "--recursive", "--depth", "1", "git://github.com/docker/docker", "/tmp"}
if !reflect.DeepEqual(args, exp) {
t.Fatalf("Expected %v, got %v", exp, args)
}
}
func TestCloneArgsStripFragment(t *testing.T) {
u, _ := url.Parse("git://github.com/docker/docker#test")
args := cloneArgs(u, "/tmp")
exp := []string{"clone", "--recursive", "git://github.com/docker/docker", "/tmp"}
if !reflect.DeepEqual(args, exp) {
t.Fatalf("Expected %v, got %v", exp, args)
}
}
func TestCheckoutGit(t *testing.T) {
root, err := ioutil.TempDir("", "docker-build-git-checkout")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(root)
gitDir := filepath.Join(root, "repo")
_, err = git("init", gitDir)
if err != nil {
t.Fatal(err)
}
if _, err = gitWithinDir(gitDir, "config", "user.email", "test@docker.com"); err != nil {
t.Fatal(err)
}
if _, err = gitWithinDir(gitDir, "config", "user.name", "Docker test"); err != nil {
t.Fatal(err)
}
if err = ioutil.WriteFile(filepath.Join(gitDir, "Dockerfile"), []byte("FROM scratch"), 0644); err != nil {
t.Fatal(err)
}
subDir := filepath.Join(gitDir, "subdir")
if err = os.Mkdir(subDir, 0755); err != nil {
t.Fatal(err)
}
if err = ioutil.WriteFile(filepath.Join(subDir, "Dockerfile"), []byte("FROM scratch\nEXPOSE 5000"), 0644); err != nil {
t.Fatal(err)
}
if err = os.Symlink("../subdir", filepath.Join(gitDir, "parentlink")); err != nil {
t.Fatal(err)
}
if err = os.Symlink("/subdir", filepath.Join(gitDir, "absolutelink")); err != nil {
t.Fatal(err)
}
if _, err = gitWithinDir(gitDir, "add", "-A"); err != nil {
t.Fatal(err)
}
if _, err = gitWithinDir(gitDir, "commit", "-am", "First commit"); err != nil {
t.Fatal(err)
}
if _, err = gitWithinDir(gitDir, "checkout", "-b", "test"); err != nil {
t.Fatal(err)
}
if err = ioutil.WriteFile(filepath.Join(gitDir, "Dockerfile"), []byte("FROM scratch\nEXPOSE 3000"), 0644); err != nil {
t.Fatal(err)
}
if err = ioutil.WriteFile(filepath.Join(subDir, "Dockerfile"), []byte("FROM busybox\nEXPOSE 5000"), 0644); err != nil {
t.Fatal(err)
}
if _, err = gitWithinDir(gitDir, "add", "-A"); err != nil {
t.Fatal(err)
}
if _, err = gitWithinDir(gitDir, "commit", "-am", "Branch commit"); err != nil {
t.Fatal(err)
}
if _, err = gitWithinDir(gitDir, "checkout", "master"); err != nil {
t.Fatal(err)
}
cases := []struct {
frag string
exp string
fail bool
}{
{"", "FROM scratch", false},
{"master", "FROM scratch", false},
{":subdir", "FROM scratch\nEXPOSE 5000", false},
{":nosubdir", "", true}, // missing directory error
{":Dockerfile", "", true}, // not a directory error
{"master:nosubdir", "", true},
{"master:subdir", "FROM scratch\nEXPOSE 5000", false},
{"master:parentlink", "FROM scratch\nEXPOSE 5000", false},
{"master:absolutelink", "FROM scratch\nEXPOSE 5000", false},
{"master:../subdir", "", true},
{"test", "FROM scratch\nEXPOSE 3000", false},
{"test:", "FROM scratch\nEXPOSE 3000", false},
{"test:subdir", "FROM busybox\nEXPOSE 5000", false},
}
for _, c := range cases {
r, err := checkoutGit(c.frag, gitDir)
fail := err != nil
if fail != c.fail {
t.Fatalf("Expected %v failure, error was %v\n", c.fail, err)
}
if c.fail {
continue
}
b, err := ioutil.ReadFile(filepath.Join(r, "Dockerfile"))
if err != nil {
t.Fatal(err)
}
if string(b) != c.exp {
t.Fatalf("Expected %v, was %v\n", c.exp, string(b))
}
}
}