* apt/utils.py:

  - add some misc utils like get_release_filename_for_pkg()

1 files changed, 75 insertions, 0 deletions

diff --git a/apt/utils.py b/apt/utils.py
new file mode 100644
index 00000000..c4c4cb73
--- /dev/null
+++ b/apt/utils.py
@@ -0,0 +1,75 @@
+# Copyright (C) 2009 Canonical
+#
+# Authors:
+#  Michael Vogt
+#
+# 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; version 3.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+# details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+import apt_pkg
+import os.path
+
+def get_maintenance_end_date(release_date, m_months):
+    """
+    get the (year, month) tuple when the maintenance for the distribution
+    ends. Needs the data of the release and the number of months that
+    its is supported as input
+    """
+    years = m_months / 12
+    months = m_months % 12
+    support_end_year = release_date.year + years + (release_date.month + months)/12
+    support_end_month = (release_date.month + months) % 12
+    return (support_end_year, support_end_month)
+
+def get_release_date_from_release_file(path):
+    """
+    return the release date as time_t for the given release file
+    """
+    if not path or not os.path.exists(path):
+        return None
+    tag = apt_pkg.ParseTagFile(open(path))
+    tag.Step()
+    if not tag.Section.has_key("Date"):
+        return None
+    date = tag.Section["Date"]
+    return apt_pkg.StrToTime(date)
+
+def get_release_filename_for_pkg(cache, pkgname, label, release):
+    " get the release file that provides this pkg "
+    if not cache.has_key(pkgname):
+        return None
+    pkg = cache[pkgname]
+    ver = None
+    # look for the version that comes from the repos with
+    # the given label and origin
+    for aver in pkg._pkg.VersionList:
+        if aver == None or aver.FileList == None:
+            continue
+        for verFile, index in aver.FileList:
+            #print verFile
+            if (verFile.Origin == label and
+                verFile.Label == label and
+                verFile.Archive == release):
+                ver = aver
+    if not ver:
+        return None
+    indexfile = cache._list.FindIndex(ver.FileList[0][0])
+    for metaindex in cache._list.List:
+        for m in metaindex.IndexFiles:
+            if (indexfile and
+                indexfile.Describe == m.Describe and
+                indexfile.IsTrusted):
+                dir = apt_pkg.Config.FindDir("Dir::State::lists")
+                name = apt_pkg.URItoFileName(metaindex.URI)+"dists_%s_Release" % metaindex.Dist
+                return dir+name
+    return None