feat: use go sdk

main.go

@@ -0,0 +1,184 @@
+package main
+
+import (
+	"context"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"net/url"
+	"os"
+	"os/exec"
+	"os/signal"
+	"strings"
+
+	"git.geekeey.de/actions/sdk"
+)
+
+func main() {
+	action := &CheckoutAction{Action: sdk.New()}
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer cancel()
+	if err := action.Run(ctx); err != nil {
+		action.Errorf("%s", err)
+		os.Exit(1)
+	}
+}
+
+type CheckoutAction struct {
+	*sdk.Action
+	repository string
+	path       string
+	reference  string
+}
+
+func (action *CheckoutAction) setup() error {
+	var err error
+
+	action.repository = action.GetInput("repository")
+	if len(action.repository) == 0 {
+		return fmt.Errorf("input 'repository': is empty") // something like '<server>/<owner>/<repo>.git'
+	}
+
+	action.path = action.GetInput("path")
+	if len(action.path) == 0 {
+		return fmt.Errorf("input 'path': is empty") // something like '.'
+	}
+
+	action.reference = action.GetInput("ref")
+	if len(action.reference) == 0 {
+		return fmt.Errorf("input 'ref': is empty") // something like 'HEAD'
+	}
+	return err
+}
+
+func (action *CheckoutAction) Run(ctx context.Context) error {
+	if err := action.setup(); err != nil {
+		return err
+	}
+
+	env := action.Context()
+	server, err := url.Parse(env.ServerURL)
+	if err != nil {
+		return fmt.Errorf("invalid serevr url: %s", err)
+	}
+
+	shell := Shell{action: action.Action, args: [][]string{}}
+
+	shell.Add("git", "config", "--global", "--add", "protocol.version", "2")
+	shell.Add("git", "init", "-q", action.path)
+	shell.Add("git", "-C", action.path, "config", "--local", "gc.auto", "0")
+	if err := shell.Run(ctx, nil, nil); err != nil {
+		return err
+	}
+
+	action.Noticef("Configuring git repository credentials")
+
+	shell.Add("git", "-C", action.path, "config", "--local", "--add",
+		fmt.Sprintf("url.%s.insteadof", server.String()), fmt.Sprintf("git@%s", server.Host))
+	shell.Add("git", "-C", action.path, "config", "--local", "--add",
+		fmt.Sprintf("url.%s.insteadof", server.String()), fmt.Sprintf("ssh://git@%s", server.Host))
+	shell.Add("git", "-C", action.path, "config", "--local", "--add",
+		fmt.Sprintf("url.%s.insteadof", server.String()), fmt.Sprintf("git://%s", server.Host))
+	if err := shell.Run(ctx, nil, nil); err != nil {
+		return err
+	}
+
+	enc := base64.StdEncoding
+	header := fmt.Sprintf("Authorization: Basic %s", enc.EncodeToString(fmt.Appendf(nil, "x-access-token:%s", env.Token)))
+
+	shell.Add("git", "-C", action.path, "config", "--local", "--add", fmt.Sprintf("http.%s.extraheader", env.ServerURL), header)
+	if err := shell.Run(ctx, nil, nil); err != nil {
+		return err
+	}
+
+	origin := "origin"
+
+	shell.Add("git", "-C", action.path, "remote", "add", origin, action.repository)
+	if err := shell.Run(ctx, nil, nil); err != nil {
+		return err
+	}
+
+	shell.Add("git", "-C", action.path, "ls-remote", origin, action.reference)
+	var stdout strings.Builder = strings.Builder{}
+	if err := shell.Run(ctx, &stdout, nil); err != nil {
+		return err
+	}
+	lines := strings.Split(stdout.String(), "\t")
+	if len(lines) < 2 {
+		return fmt.Errorf("git ls-remore resolved nothing")
+	}
+	sha := strings.TrimSpace(lines[0])
+	ref := strings.TrimSpace(lines[1])
+
+	var name string
+	var ok bool
+	if name, ok = strings.CutPrefix(ref, "refs/heads/"); ok {
+		remote := fmt.Sprintf("refs/remotes/%s/%s", origin, name)
+		branch := name
+
+		action.Debugf("Checking out branch %s@%s", name, sha)
+
+		shell.Add("git", "-C", action.path, "fetch", "--no-tags", "--prune", "--no-recurse-submodules", "--depth=1",
+			origin, fmt.Sprintf("+%s:%s", sha, remote))
+		shell.Add("git", "-C", action.path, "checkout", "--force", "-B", branch, remote)
+	} else if name, ok = strings.CutPrefix(ref, "refs/pull/"); ok {
+		remote := fmt.Sprintf("refs/remotes/pull/%s", name)
+
+		action.Debugf("Checking out pull-request %s@%s", name, sha)
+
+		var branch string
+		if len(env.BaseRef) != 0 {
+			branch = env.BaseRef
+		} else if len(env.HeadRef) != 0 {
+			branch = env.HeadRef
+		} else {
+			return fmt.Errorf("pull request can not find base ref for branch")
+		}
+
+		shell.Add("git", "-C", action.path, "fetch", "--no-tags", "--prune", "--no-recurse-submodules", "--depth=1",
+			origin, fmt.Sprintf("+%s:%s", sha, remote))
+		shell.Add("git", "-C", action.path, "checkout", "--force", "-B", branch, remote)
+	} else if name, ok = strings.CutPrefix(ref, "refs/tags/"); ok {
+		remote := fmt.Sprintf("refs/tags/%s", name)
+
+		action.Debugf("Checking out tag %s@%s", name, sha)
+
+		shell.Add("git", "-C", action.path, "fetch", "--no-tags", "--prune", "--no-recurse-submodules", "--depth=1",
+			origin, fmt.Sprintf("+%s:%s", sha, remote))
+		shell.Add("git", "-C", action.path, "checkout", "--force", remote)
+	} else {
+		action.Debugf("Checking out detached head %s", ref)
+
+		shell.Add("git", "-C", action.path, "fetch", "--no-tags", "--prune", "--no-recurse-submodules", "--depth=1",
+			origin, ref)
+		shell.Add("git", "-C", action.path, "checkout", "--force", ref)
+	}
+
+	if err := shell.Run(ctx, nil, nil); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+type Shell struct {
+	action *sdk.Action
+	args   [][]string
+}
+
+func (sh *Shell) Add(args ...string) { sh.args = append(sh.args, args) }
+func (sh *Shell) Run(ctx context.Context, stdout io.Writer, stderr io.Writer) error {
+	for _, args := range sh.args {
+		if sh.action != nil {
+			sh.action.Debugf("exec: %s", strings.Join(args, " "))
+		}
+		cmd := exec.CommandContext(ctx, args[0], args[1:]...)
+		cmd.Stdout = stdout
+		cmd.Stderr = stderr
+		if err := cmd.Run(); err != nil {
+			return err
+		}
+	}
+	sh.args = [][]string{}
+	return nil
+}