1 files changed, 48 insertions, 0 deletions
diff --git a/src/lib/Bcfg2/Server/Plugins/Darcs.py b/src/lib/Bcfg2/Server/Plugins/Darcs.py
new file mode 100644
index 000000000..9fb9ff4f1
--- /dev/null
+++ b/src/lib/Bcfg2/Server/Plugins/Darcs.py
@@ -0,0 +1,48 @@
+import os
+from subprocess import Popen, PIPE
+import Bcfg2.Server.Plugin
+
+# for debugging output only
+import logging
+logger = logging.getLogger('Bcfg2.Plugins.Darcs')
+
+class Darcs(Bcfg2.Server.Plugin.Plugin,
+             Bcfg2.Server.Plugin.Version):
+    """Darcs is a version plugin for dealing with Bcfg2 repos."""
+    name = 'Darcs'
+    __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 darcs directory for bcfg2 repo
+        darcs_dir = "%s/_darcs" % datastore
+
+        # Read changeset from bcfg2 repo
+        if os.path.isdir(darcs_dir):
+            self.get_revision()
+        else:
+            logger.error("%s is not present." % darcs_dir)
+            raise Bcfg2.Server.Plugin.PluginInitError
+
+        logger.debug("Initialized Darcs plugin with darcs directory = %s" % darcs_dir)
+
+    def get_revision(self):
+        """Read Darcs changeset information for the Bcfg2 repository."""
+        try:
+            data = Popen("env LC_ALL=C darcs changes",
+                        shell=True,
+                        cwd=self.datastore,
+                        stdout=PIPE).stdout.readlines()
+            revision = data[0].strip('\n')
+        except:
+            logger.error("Failed to read darcs repository; disabling Darcs support")
+            logger.error('''Ran command "darcs changes" from directory "%s"''' % (self.datastore))
+            logger.error("Got output: %s" % data)
+            raise Bcfg2.Server.Plugin.PluginInitError
+        return revision
+