* implement an API to find all available packages in repos

* fix: do not remove package from component if we are not removing a package from repository! this is a workaround. the design of packagedb somehow does not look very good :/

pisi/api.py

@@ -104,6 +104,15 @@ def finalize():
         ctx.ui.close()
         ctx.initialized = False
 
+def list_available():
+    '''returns a set of available package names'''
+
+    available = set()
+    for repo in pisi.context.repodb.list():
+        pkg_db = pisi.packagedb.get_db(repo)
+        available.update(pkg_db.list_packages())
+    return available
+
 def list_upgradable():
     ignore_build = ctx.config.options and ctx.config.options.ignore_build_no
 

pisi/packagedb.py

@@ -37,6 +37,7 @@ class PackageDB(object):
     """PackageDB class provides an interface to the package database 
     using shelf objects"""
     def __init__(self, id):
+        self.id = id
         self.d = shelve.LockedDBShelf('package-%s' % id )
         self.dr = shelve.LockedDBShelf('revdep-%s' % id )
 
@@ -102,6 +103,8 @@ class PackageDB(object):
             package_info = self.d.get(name, txn)
             self.d.delete(name, txn)
             #FIXME: what's happening to dr?
+            #WORKAROUND: do not remove component if it is not in repo
+            if self.id.startswith('repo'):
                 ctx.componentdb.remove_package(package_info.partOf, package_info.name, txn)
         self.d.txn_proc(proc, txn)