Clone the source code of the branches during the build

This commit removes the shared git repository in the root directory:
instead, a 1-depth clone of the branch is done at the start of each
build, so the source code is guaranteed to be fresh.

This doesn't affect build times so much, because only the latest commit
is cloned, not the whole history.

managetests/__main__.py

@@ -75,7 +75,7 @@ def init_command(ctx, git_url):
         error("root directory not empty")
 
     root.mkdir(parents=True)
-    for dir in ("git", "branches"):
+    for dir in ("branches",):
         (root / dir).mkdir()
 
     with (root / "version").open("w") as f:
@@ -83,6 +83,7 @@ def init_command(ctx, git_url):
 
     with (root / "config.json").open("w") as f:
         content = {
+            "git-url": git_url,
             "gitlab-url": "http://code.ubuntu-it.org",
             "gitlab-project": "ubuntu-it-web/www",
             "gitlab-token": "abcdefghi",
@@ -101,8 +102,6 @@ def init_command(ctx, git_url):
         json.dump(content, f, indent=4)
         f.write("\n")
 
-    subprocess.call(["git", "clone", git_url, str(root / "git"), "--bare"])
-
 
 @cli.command("run")
 @click.option("-p", "--port", help="The port for the frontend application",

managetests/branches.py

@@ -206,7 +206,7 @@ class Branch:
             shutil.rmtree(str(branch))
         branch.mkdir()
 
-        git_dir = str(self.manager.root / "git")
+        git_url = self.manager.config["git-url"]
         build_dir = branch / "build"
         log_file = branch / "build.log"
 
@@ -227,19 +227,16 @@ class Branch:
 
         # Update the bare git repository and checkout the branch
         subprocess.call([
-            "git", "--git-dir", git_dir, "fetch", "origin"
-        ], stdout=log_file.open("a"), stderr=subprocess.STDOUT)
-        subprocess.call([
-            "git", "--git-dir", git_dir, "--work-tree", str(build_dir),
-            "checkout", "-f", self.name,
+            "git", "clone", "--depth", "1", "--branch", self.name, git_url,
+            str(build_dir),
         ], stdout=log_file.open("a"), stderr=subprocess.STDOUT)
 
         # Get the commit of the branch
         commit_file = branch / "commit"
-        subprocess.call(
-            ["git", "--git-dir", git_dir, "rev-parse", self.name],
-            stdout=commit_file.open("w"), stderr=log_file.open("a"),
-        )
+        subprocess.call([
+            "git", "--git-dir", str(build_dir / ".git"), "rev-parse",
+            self.name
+        ], stdout=commit_file.open("w"), stderr=log_file.open("a"))
 
         # Copy and load the configuration file
         if not (build_dir / "managetests.json").exists():

managetests/utils.py

@@ -17,7 +17,7 @@
 import pathlib
 
 
-ROOT_DIR_VERSION = "1"
+ROOT_DIR_VERSION = "2"
 
 
 def is_root_valid(path):
@@ -27,7 +27,7 @@ def is_root_valid(path):
     if not (path.exists() and path.is_dir()):
         return False
 
-    required_dirs = ["git", "branches"]
+    required_dirs = ["branches"]
     required_files = ["config.json", "details.json", "version"]
 
     for dir in required_dirs: