From 1db0459ae3a8a2240ffb9585bb1c378d7b17acbb Mon Sep 17 00:00:00 2001
From: Sebastian Heinlein <sebi@glatzor.de>
Date: Thu, 21 Aug 2008 15:03:30 +0200
Subject: Add apt.Cache.clear() method (taken from GDebi), which re initializes
 the dependecy cache.

---
 apt/cache.py | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'apt/cache.py')

diff --git a/apt/cache.py b/apt/cache.py
index bbf2165b..3df2b4a6 100644
--- a/apt/cache.py
+++ b/apt/cache.py
@@ -232,6 +232,10 @@ class Cache(object):
             fetcher.Shutdown()
         return (res == pm.ResultCompleted)
 
+    def clear(self):
+         """ Unmark all changes """
+         self._depcache.Init()
+
     # cache changes
     def cachePostChange(self):
         " called internally if the cache has changed, emit a signal then "
-- 
cgit v1.2.3


From 312c6465f3ac7da68c610a01b4856cb45ae62b34 Mon Sep 17 00:00:00 2001
From: Sebastian Heinlein <sebi@glatzor.de>
Date: Thu, 21 Aug 2008 18:34:41 +0200
Subject: Add apt.cache.Cache.isVirtualPackage() and
 apt.cache.Cache.getProvidingPackages() - taken from GDebi.

---
 apt/cache.py | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'apt/cache.py')

diff --git a/apt/cache.py b/apt/cache.py
index 3df2b4a6..e59e30c3 100644
--- a/apt/cache.py
+++ b/apt/cache.py
@@ -182,6 +182,51 @@ class Cache(object):
         finally:
             os.close(lock)
 
+    def isVirtualPackage(self, name):
+        """ 
+        Return True if the package of the given name is a virtual package
+        """
+        try:
+            virtual_pkg = self._cache[name]
+        except KeyError:
+            return False
+        if len(virtual_pkg.VersionList) == 0:
+            return True
+        return False
+
+    def getProvidingPackages(self, virtual):
+        """
+        Return a list of packages which provide the virtual package of the
+        specified name
+        """
+        providers = []
+        try:
+            vp = self._cache[virtual]
+            if len(vp.VersionList) != 0:
+                return providers
+        except IndexError:
+            return providers
+        for pkg in self:
+            v = self._depcache.GetCandidateVer(pkg._pkg)
+            if v == None:
+                continue
+            for p in v.ProvidesList:
+                #print virtual
+                #print p[0]
+                if virtual == p[0]:
+                    # we found a pkg that provides this virtual
+                    # pkg, check if the proivdes is any good
+                    providers.append(pkg)
+                    #cand = self._cache[pkg.name]
+                    #candver = self._cache._depcache.GetCandidateVer(cand._pkg)
+                    #instver = cand._pkg.CurrentVer
+                    #res = apt_pkg.CheckDep(candver.VerStr,oper,ver)
+                    #if res == True:
+                    #    self._dbg(1,"we can use %s" % pkg.name)
+                    #    or_found = True
+                    #    break
+        return providers
+
     def update(self, fetchProgress=None):
         " run the equivalent of apt-get update "
         lockfile = apt_pkg.Config.FindDir("Dir::State::Lists") + "lock"
-- 
cgit v1.2.3


From fcb99cb79276d87ec47dedd7be3b0eefd278a0df Mon Sep 17 00:00:00 2001
From: Sebastian Heinlein <sebi@glatzor.de>
Date: Thu, 21 Aug 2008 18:36:31 +0200
Subject: Small fix: catch dict exceptions in getProvidingPackages

---
 apt/cache.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'apt/cache.py')

diff --git a/apt/cache.py b/apt/cache.py
index e59e30c3..3fd1e996 100644
--- a/apt/cache.py
+++ b/apt/cache.py
@@ -204,7 +204,7 @@ class Cache(object):
             vp = self._cache[virtual]
             if len(vp.VersionList) != 0:
                 return providers
-        except IndexError:
+        except KeyError:
             return providers
         for pkg in self:
             v = self._depcache.GetCandidateVer(pkg._pkg)
-- 
cgit v1.2.3