Add support for delta generation against the package shipped within

BaseDeltaRelease configuration option e.g. 2011, 2011.1, etc.

buildfarm/pisiinterface.py

@@ -17,6 +17,7 @@
 import pisi.config
 
 from buildfarm import cli, logger, utils
+from buildfarm.releasecache import ReleaseCache
 from buildfarm.config import configuration as conf
 
 
@@ -79,6 +80,13 @@ def build(self, pspec):
             self.builder.search_old_packages_for_delta(max_count=3,
                                                        search_paths=(utils.get_stable_packages_directory(),))
 
+            # and 1 for the previous distribution release (e.g. 2011.1)
+            package_name = utils.get_package_name_from_path(pspec)
+            last_disto_release = ReleaseCache().get_last_release(package_name)
+            if last_distro_release:
+                self.builder.search_old_packages_for_delta(release=last_distro_release,
+                                                           search_paths=(utils.get_stable_packages_directory(),))
+
         self.builder.build()
 
         logger.info("Created package(s): %s" % self.builder.new_packages)

buildfarm/releasecache.py

@@ -0,0 +1,65 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2011 TUBITAK/UEKAE
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# Please read the COPYING file.
+
+import os
+import pisi
+import piksemel
+
+from buildfarm import utils
+from buildfarm import logger
+from buildfarm.config import configuration as conf
+
+class ReleaseCache(object):
+    """Holds a mapping of source package names to release numbers.
+    This is used to fetch the release numbers of packages back in
+    release time like 2011, 2011.1, etc."""
+
+    __metaclass__ = pisi.util.Singleton
+
+    def __init__(self):
+        self.d = {}
+
+        # Final local index that should exist
+        local_index = os.path.join(conf.buildfarmdir, "index-%s.xml" % conf.basedeltarelease)
+
+        if not os.path.exists(local_index):
+            remote_index = utils.get_remote_tags_repository_index_url()
+            try:
+                index_file = pisi.file.File(remote_index,
+                                            mode=pisi.file.File.read,
+                                            transfer_dir=conf.buildfarmdir,
+                                            compress=pisi.file.File.COMPRESSION_TYPE_AUTO)
+                # Index available, rename it
+                os.rename(os.path.join(conf.buildfarmdir, "pisi-index.xml"), local_index)
+                os.unlink(os.path.join(conf.buildfarmdir, "pisi-index.xml.bz2"))
+            except:
+                logger.error("Could not fetch %s will not build delta packages against %s release!" % (remote_index,
+                                                                                                       conf.basedeltarelease))
+                return
+
+        # Parse it
+        doc = piksemel.parse(local_index)
+
+        for specfile in doc.tags("SpecFile"):
+            source = specfile.getTag("Source")
+            name = source.getTagData("Name")
+
+            history = specfile.getTag("History")
+            update = history.getTag("Update")
+            release = update.getAttribute("release")
+
+            self.d[name] = release
+
+    def get_last_release(self, package_name):
+        """Returns the release number of package_name in the last
+        release."""
+        return self.d.get(package_name)

buildfarm/utils.py

@@ -84,6 +84,12 @@ def get_remote_repository_url():
                         conf.release,
                         conf.subrepository)
 
+def get_remote_tags_repository_index_url():
+    return os.path.join(conf.scmrepositorybaseurl,
+                        "tags",
+                        conf.basedeltarelease,
+                        "pisi-index.xml.bz2")
+
 def get_package_log_directory():
     return os.path.join(conf.logdir,
                         conf.release,

data/buildfarm.conf

@@ -7,6 +7,7 @@ Name=Pardus
 Release=
 SubRepository=devel
 Architecture=
+BaseDeltaRelease=
 
 [SCM]
 SCM=svn