Add opendev.org https and git fetcher

Related to juju#552

https://bugs.launchpad.net/charm-barbican/+bug/1846263

Author: Ryan Beisner

charmtools/fetchers.py

@@ -195,6 +195,21 @@ def fetch(self, dir_):
         return rename(dir_)
 
 
+class OpendevFetcher(Fetcher):
+    MATCH = re.compile(r"""
+    ^(https:\/\/(www\.)?opendev\.com\/|git@opendev.com:)
+    (?P<repo>[^@]*)(@(?P<revision>.*))?$
+    """, re.VERBOSE)
+
+    def fetch(self, dir_):
+        dir_ = tempfile.mkdtemp(dir=dir_)
+        url = 'https://opendev.org/' + self.repo
+        git('clone {} {}'.format(url, dir_))
+        if self.revision:
+            git('checkout {}'.format(self.revision), cwd=dir_)
+        return rename(dir_)
+
+
 class GitFetcher(Fetcher):
     """Generic git fetcher.
 
@@ -358,6 +373,7 @@ def check_output(cmd, **kw):
     BzrFetcher,
     BzrMergeProposalFetcher,
     GithubFetcher,
+    OpendevFetcher,
     BitbucketFetcher,
     LocalFetcher,
     CharmstoreDownloader,

tests/test_fetchers.py

@@ -7,6 +7,7 @@
     BzrFetcher,
     BzrMergeProposalFetcher,
     GithubFetcher,
+    OpendevFetcher,
     GitFetcher,
     BitbucketFetcher,
     LocalFetcher,
@@ -132,6 +133,41 @@ def test_can_fetch(self):
             self.assertEqual(test, {})
 
 
+class OpendevFetcherTest(unittest.TestCase):
+    def test_can_fetch(self):
+        f = OpendevFetcher.can_fetch
+
+        good_tests = [
+            f('https://opendev.com/charms/foo'),
+            f('https://www.opendev.com/charms/foo'),
+            f('git@opendev.com:charms/foo'),
+        ]
+
+        bad_tests = [
+            f('http://www.opendev.com/charms/foo'),
+            f('http://opendev.com/charms/foo'),
+            f('gh:charms/foo'),
+            f('github:charms/foo'),
+            f('http://github.com/charms/foo'),
+            f('https://github.com/charms/foo'),
+            f('http://www.github.com/charms/foo'),
+            f('https://www.github.com/charms/foo'),
+            f('git@github.com:charms/foo'),
+            f('lp:~openstack-charmers/charms/bionic/foo'),
+            f('lp:~openstack-charmers/charms/bionic/foo/+merge/12345'),
+            f('bb:charms/foo'),
+            f('local:~/src/charms/bionic/foo'),
+            f('cs:bionic/foo'),
+            f('bundle:openstack-base/single'),
+        ]
+
+        for test in good_tests:
+            self.assertEqual(test['repo'], 'charms/foo')
+
+        for test in bad_tests:
+            self.assertEqual(test, {})
+
+
 class GitFetcherTest(unittest.TestCase):
     def test_can_fetch(self):
         f = GitFetcher.can_fetch