Add MercurialRepoProvider

binderhub/app.py

@@ -35,7 +35,7 @@
 from .repoproviders import (GitHubRepoProvider, GitRepoProvider,
                             GitLabRepoProvider, GistRepoProvider,
                             ZenodoProvider, FigshareProvider, HydroshareProvider,
-                            DataverseProvider)
+                            DataverseProvider, MercurialRepoProvider)
 from .metrics import MetricsHandler
 
 from .utils import ByteSpecification, url_path_join
@@ -420,6 +420,7 @@ def _add_slash(self, proposal):
             'figshare': FigshareProvider,
             'hydroshare': HydroshareProvider,
             'dataverse': DataverseProvider,
+            'hg': MercurialRepoProvider,
         },
         config=True,
         help="""

binderhub/event-schemas/launch.json

@@ -14,7 +14,8 @@
                 "Zenodo",
                 "Figshare",
                 "Hydroshare",
-                "Dataverse"
+                "Dataverse",
+                "Mercurial"
             ],
             "description": "Provider for the repository being launched"
         },

binderhub/main.py

@@ -19,6 +19,7 @@
     "figshare": "Figshare",
     "hydroshare": "Hydroshare",
     "dataverse": "Dataverse",
+    "hg": "Mercurial",
 }
 
 

binderhub/repoproviders.py

@@ -899,3 +899,46 @@ async def get_resolved_spec(self):
 
     def get_build_slug(self):
         return self.gist_id
+
+
+class MercurialRepoProvider(GitRepoProvider):
+    """Bare bones Mercurial repo provider.
+
+    Users must provide a spec of the following form.
+
+    <url-escaped-namespace>/<unresolved_ref>
+    <url-escaped-namespace>/<resolved_ref>
+
+    eg:
+    https://foss.heptapod.net/pypy/pypy/release-pypy3.7-v7.3.2rc3
+    https://foss.heptapod.net/graphics/plot-covid19-fr/8e29b5b0064d
+
+    """
+
+    name = Unicode("Mercurial")
+
+    @gen.coroutine
+    def get_resolved_ref(self):
+        if hasattr(self, 'resolved_ref'):
+            return self.resolved_ref
+
+        try:
+            # Check if the reference is a valid SHA hash
+            self.sha1_validate(self.unresolved_ref)
+        except ValueError:
+            # The ref is a head/tag and we resolve it using `hg identify`
+            command = ["hg", "identify", self.repo, "-r", self.unresolved_ref, "-T", "{id}"]
+            result = subprocess.run(command, universal_newlines=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+            if result.returncode:
+                raise RuntimeError("Unable to run hg identify to get the `resolved_ref`: {}".format(result.stderr))
+            if not result.stdout:
+                raise ValueError("The specified branch, tag or commit SHA ('{}') was not found on the remote repository."
+                                .format(self.unresolved_ref))
+            resolved_ref = result.stdout.strip()
+            self.sha1_validate(resolved_ref)
+            self.resolved_ref = resolved_ref
+        else:
+            # The ref already was a valid SHA hash
+            self.resolved_ref = self.unresolved_ref
+
+        return self.resolved_ref

binderhub/static/js/index.js

@@ -99,6 +99,10 @@ function updateRepoText() {
     $("#ref").prop("disabled", true);
     $("label[for=ref]").prop("disabled", true);
   }
+  else if (provider === "hg") {
+    text = "Arbitrary Mercurial repository URL (http://hg.example.com/repo)";
+    tag_text = "Mercurial branch, tag, topic or commit SHA";
+  }
   $("#repository").attr('placeholder', text);
   $("label[for=repository]").text(text);
   $("#ref").attr('placeholder', tag_text);

binderhub/templates/index.html

@@ -56,6 +56,7 @@ <h4 id="form-header" class='row'>Build and launch a repository</h4>
                 <li class="dropdown-item" value="gist"><a href="#">Gist</a></li>
                 <li class="dropdown-item" value="gl"><a href="#">GitLab.com</a></li>
                 <li class="dropdown-item" value="git"><a href="#">Git repository</a></li>
+                <li class="dropdown-item" value="hg"><a href="#">Mercurial repository</a></li>
                 <li class="dropdown-item" value="zenodo"><a href="#">Zenodo DOI</a></li>
                 <li class="dropdown-item" value="figshare"><a href="#">Figshare DOI</a></li>
                 <li class="dropdown-item" value="hydroshare"><a href="#">Hydroshare resource</a></li>

binderhub/tests/test_repoproviders.py

@@ -7,7 +7,7 @@
 from binderhub.repoproviders import (
     tokenize_spec, strip_suffix, GitHubRepoProvider, GitRepoProvider,
     GitLabRepoProvider, GistRepoProvider, ZenodoProvider, FigshareProvider,
-    HydroshareProvider, DataverseProvider
+    HydroshareProvider, DataverseProvider, MercurialRepoProvider
 )
 
 
@@ -404,3 +404,29 @@ def test_gist_secret():
 
     provider = GistRepoProvider(spec=spec, allow_secret_gist=True)
     assert IOLoop().run_sync(provider.get_resolved_ref) is not None
+
+
+@pytest.mark.parametrize('url,unresolved_ref,resolved_ref', [
+    ['https://foss.heptapod.net/graphics/plot-covid19-fr',
+     '3f1209cb613a',
+     '3f1209cb613a1286e555d8cabe722c1be2a6f123'],
+    ['https://foss.heptapod.net/pypy/pypy',
+     'release-pypy3.7-v7.3.2rc3',
+     '87875bf2dfd8fe682a49e010f6636a871b1308e6']
+])
+def test_mercurial_ref(url, unresolved_ref, resolved_ref):
+    spec = '{}/{}'.format(
+        quote(url, safe=''),
+        quote(unresolved_ref)
+    )
+    provider = MercurialRepoProvider(spec=spec)
+    slug = provider.get_build_slug()
+    assert slug == url
+    full_url = provider.get_repo_url()
+    assert full_url == url
+    ref = IOLoop().run_sync(provider.get_resolved_ref)
+    assert ref == resolved_ref
+    ref_url = IOLoop().run_sync(provider.get_resolved_ref_url)
+    assert ref_url == full_url
+    resolved_spec = IOLoop().run_sync(provider.get_resolved_spec)
+    assert resolved_spec == quote(url, safe='') + f'/{resolved_ref}'