Add zypper plugin for openSUSE

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

3 files changed, 42 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 677d59f..cb1ca18 100644
--- a/Makefile
+++ b/Makefile
@@ -36,6 +36,9 @@ ifeq ($(HIGHLEVEL_PACKAGE_MANAGER),yum)
 	$(INSTALL_DATA) yum-etckeeper.py $(DESTDIR)$(prefix)/lib/yum-plugins/etckeeper.py
 	$(INSTALL_DATA) yum-etckeeper.conf $(DESTDIR)$(etcdir)/yum/pluginconf.d/etckeeper.conf
 endif
+ifeq ($(HIGHLEVEL_PACKAGE_MANAGER),zypper)
+	$(INSTALL_DATA) zypper-etckeeper.py $(DESTDIR)$(prefix)/lib/zypp/plugins/commit/zypper-etckeeper.py
+endif
 	-./etckeeper-bzr/__init__.py install --root=$(DESTDIR) ${PYTHON_INSTALL_OPTS} || echo "** bzr support not installed"
 	echo "** installation successful"
 
diff --git a/etckeeper.conf b/etckeeper.conf
index c95f377..4d6dd8a 100644
--- a/etckeeper.conf
+++ b/etckeeper.conf
@@ -30,7 +30,7 @@ DARCS_COMMIT_OPTIONS="-a"
 #AVOID_COMMIT_BEFORE_INSTALL=1
 
 # The high-level package manager that's being used.
-# (apt, pacman-g2, yum etc)
+# (apt, pacman-g2, yum, zypper etc)
 HIGHLEVEL_PACKAGE_MANAGER=apt
 
 # The low-level package manager that's being used.
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()