Add zypper plugin for openSUSE

This uses zypp_plugin, a Python helper for implementing the protocol
between zypper and plugins.

1 files changed, 38 insertions, 0 deletions

diff --git a/zypper-etckeeper.py b/zypper-etckeeper.py
new file mode 100755
index 0000000..b21f23d
--- /dev/null
+++ b/zypper-etckeeper.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+
+import errno
+import subprocess
+import zypp_plugin
+
+
+def _call_etckeeper(install_arg):
+    # zypper interprets the plugin's stdout as described in
+    # http://doc.opensuse.org/projects/libzypp/HEAD/zypp-plugins.html so it's
+    # important that we don't write anything to it. We therefore redirect
+    # etckeeper's stdout to the plugin's stderr. Since zypper writes the
+    # stderr of plugins to its log file, etckeeper's stdout will go there as
+    # well.
+
+    subprocess.call(['etckeeper', install_arg], stdout=2)
+
+
+class EtckeeperPlugin(zypp_plugin.Plugin):
+    def PLUGINBEGIN(self, headers, body):
+        _call_etckeeper('pre-install')
+        self.ack()
+
+    def PLUGINEND(self, headers, body):
+        try:
+            _call_etckeeper('post-install')
+        except OSError as e:
+            # if etckeeper was just removed, executing it will fail with
+            # ENOENT
+            if e.errno != errno.ENOENT:
+                # reraise so that we don't hide other errors than etckeeper
+                # not existing
+                raise
+        self.ack()
+
+
+plugin = EtckeeperPlugin()
+plugin.main()