Fix crash of post-receive when checkout directory does not exist

.travis.yml

@@ -5,6 +5,9 @@ python:
  - "3.5"
  - "3.6"
  - "nightly"
+matrix:
+  allow_failures:
+    - python: "nightly"
 install:
  - pip install -e .
  - pip install pytest

dzonegit.py

@@ -434,6 +434,7 @@ def post_receive(stdin=sys.stdin):
         raise SystemExit("Checkout path not defined. Nothing to do.")
 
     print("Checking out repository into {}…".format(checkoutpath))
+    Path(checkoutpath).mkdir(parents=True, exist_ok=True)
     subprocess.run(
         ["git", "checkout", "-f", "master"],
         check=True,

setup.py

@@ -5,7 +5,7 @@ readme = Path(__file__).with_name("README.rst").read_text()
 
 setup(
     name="dzonegit",
-    version="0.4",
+    version="0.5",
     description="Git hooks to manage a repository of DNS zones",
     long_description=readme,
     long_description_content_type="text/x-rst",

test_dzonegit.py

@@ -280,13 +280,14 @@ def test_post_receive(git_dir):
         head,
     )
     stdin = StringIO(revisions)
-    codir = git_dir.mkdir("co")
+    codir = git_dir.join("co")
     subprocess.call(["git", "config", "dzonegit.checkoutpath", str(codir)])
     subprocess.call([
         "git", "config", "dzonegit.reconfigcmd",
         "echo TEST >{}/test".format(codir),
     ])
     dzonegit.post_receive(stdin)
+    dzonegit.post_receive(stdin)  # Check coping with existing codir
     assert codir.join("dummy.zone").check()
     assert codir.join("test").read() == "TEST\n"