* DistUpgrade/DistUpgradeCache.py, DistUpgrade.cfg, README:

  - added "RemoveEssentialOk" to control if certain essential package
    are removed 

3 files changed, 6 insertions, 1 deletions

diff --git a/DistUpgrade/DistUpgrade.cfg b/DistUpgrade/DistUpgrade.cfg
index f063840d..02a77564 100644
--- a/DistUpgrade/DistUpgrade.cfg
+++ b/DistUpgrade/DistUpgrade.cfg
@@ -9,6 +9,7 @@ MetaPkgs=ubuntu-desktop, kubuntu-desktop, edubuntu-desktop, xubuntu-desktop
 BaseMetaPkgs=ubuntu-minimal
 PostUpgradePurge=xorg-common, libgl1-mesa
 Demotions=demoted.cfg
+RemoveEssentialOk=sysvinit
 
 # information about the individual meta-pkgs
 [ubuntu-desktop]
diff --git a/DistUpgrade/DistUpgradeCache.py b/DistUpgrade/DistUpgradeCache.py
index 37dd96db..1f53b6be 100644
--- a/DistUpgrade/DistUpgradeCache.py
+++ b/DistUpgrade/DistUpgradeCache.py
@@ -197,11 +197,13 @@ class MyCache(apt.Cache):
         """ this function tests if the current changes don't violate
             our constrains (blacklisted removals etc)
         """
+        removeEssentialOk = self.config.getlist("Distro","RemoveEssentialOk")
         for pkg in self.getChanges():
             if pkg.markedDelete and self._inRemovalBlacklist(pkg.name):
                 logging.debug("The package '%s' is marked for removal but it's in the removal blacklist", pkg.name)
                 return False
-            if pkg.markedDelete and pkg._pkg.Essential == True:
+            if pkg.markedDelete and (pkg._pkg.Essential == True and
+                                     not pkg.name in removeEssentialOk):
                 logging.debug("The package '%s' is marked for removal but it's a ESSENTIAL package", pkg.name)
                 return False
         return True
diff --git a/DistUpgrade/README b/DistUpgrade/README
index 9d408f43..60c761d6 100644
--- a/DistUpgrade/README
+++ b/DistUpgrade/README
@@ -30,6 +30,8 @@ PostUpgrade{Install,Remove,Purge}:
 ForcedObsoletes: 
   Obsolete packages that the user is asked about after the upgrade (marking 
   happens *after* the cache.commit())
+RemoveEssentialOk:
+  Those packages are ok to remove even though they are essential
 
 [$meta-pkg]
 KeyDependencies: