Support sha256 git repos (#173)

flags.go

@@ -17,6 +17,11 @@ var globalFlags = []cli.Flag{
 		Usage:   "git clone ssh url",
 		EnvVars: []string{"PLUGIN_REMOTE_SSH", "CI_REPO_CLONE_SSH_URL"},
 	},
+	&cli.StringFlag{
+		Name:    "object-format",
+		Usage:   "specify the object format (hash) to be used on init. if not set it is autodetect by the commit sha.",
+		EnvVars: []string{"PLUGIN_OBJECT_FORMAT"},
+	},
 	&cli.StringFlag{
 		Name:    "path",
 		Usage:   "git clone path",

main.go

@@ -30,8 +30,9 @@ func run(c *cli.Context) error {
 
 	plugin := Plugin{
 		Repo: Repo{
-			Clone:    c.String("remote"),
-			CloneSSH: c.String("remote-ssh"),
+			Clone:        c.String("remote"),
+			CloneSSH:     c.String("remote-ssh"),
+			ObjectFormat: c.String("object-format"),
 		},
 		Pipeline: Pipeline{
 			Commit: c.String("sha"),

plugin.go

@@ -60,8 +60,16 @@ func (p Plugin) Exec() error {
 		}
 	}
 
+	// autodetect object-format if not set
+	if p.Repo.ObjectFormat == "" {
+		p.Repo.ObjectFormat = "sha1"
+		if len(p.Pipeline.Commit) == 64 {
+			p.Repo.ObjectFormat = "sha256"
+		}
+	}
+
 	if isDirEmpty(filepath.Join(p.Pipeline.Path, ".git")) {
-		cmds = append(cmds, initGit(p.Config.Branch))
+		cmds = append(cmds, initGit(p.Config.Branch, p.Repo.ObjectFormat))
 		cmds = append(cmds, safeDirectory(p.Config.SafeDirectory))
 		if p.Config.UseSSH {
 			// If env var PLUGIN_USE_SSH is set to true, use SSH instead of HTTPS
@@ -217,11 +225,11 @@ func appendEnv(cmd *exec.Cmd, env ...string) *exec.Cmd {
 }
 
 // Creates an empty git repository.
-func initGit(branch string) *exec.Cmd {
+func initGit(branch, objectFormat string) *exec.Cmd {
 	if branch == "" {
-		return appendEnv(exec.Command("git", "init"), defaultEnvVars...)
+		return appendEnv(exec.Command("git", "init", "--object-format", objectFormat), defaultEnvVars...)
 	}
-	return appendEnv(exec.Command("git", "init", "-b", branch), defaultEnvVars...)
+	return appendEnv(exec.Command("git", "init", "--object-format", objectFormat, "-b", branch), defaultEnvVars...)
 }
 
 func safeDirectory(safeDirectory string) *exec.Cmd {

types.go

@@ -7,8 +7,9 @@ import (
 
 type (
 	Repo struct {
-		Clone    string
-		CloneSSH string
+		Clone        string
+		CloneSSH     string
+		ObjectFormat string
 	}
 
 	Pipeline struct {