1 files changed, 45 insertions, 0 deletions
diff --git a/src/lib/Bcfg2/Server/Plugins/Hg.py b/src/lib/Bcfg2/Server/Plugins/Hg.py
new file mode 100644
index 000000000..0c3537613
--- /dev/null
+++ b/src/lib/Bcfg2/Server/Plugins/Hg.py
@@ -0,0 +1,45 @@
+import os
+from mercurial import ui, hg
+import Bcfg2.Server.Plugin
+
+# for debugging output only
+import logging
+logger = logging.getLogger('Bcfg2.Plugins.Mercurial')
+
+class Hg(Bcfg2.Server.Plugin.Plugin,
+             Bcfg2.Server.Plugin.Version):
+    """Mercurial is a version plugin for dealing with Bcfg2 repository."""
+    name = 'Mercurial'
+    __author__ = 'bcfg-dev@mcs.anl.gov'
+    experimental = True
+
+    def __init__(self, core, datastore):
+        Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
+        Bcfg2.Server.Plugin.Version.__init__(self)
+        self.core = core
+        self.datastore = datastore
+
+        # path to hg directory for Bcfg2 repo
+        hg_dir = "%s/.hg" % datastore
+
+        # Read changeset from bcfg2 repo
+        if os.path.isdir(hg_dir):
+            self.get_revision()
+        else:
+            logger.error("%s is not present." % hg_dir)
+            raise Bcfg2.Server.Plugin.PluginInitError
+
+        logger.debug("Initialized hg plugin with hg directory = %s" % hg_dir)
+
+    def get_revision(self):
+        """Read hg revision information for the Bcfg2 repository."""
+        try:
+            repo_path = "%s/" % self.datastore
+            repo = hg.repository(ui.ui(), repo_path)
+            tip = repo.changelog.tip()
+            revision = repo.changelog.rev(tip)
+        except:
+            logger.error("Failed to read hg repository; disabling mercurial support")
+            raise Bcfg2.Server.Plugin.PluginInitError
+        return revision
+