elbepack: cdroms: use source name of pkgs with on_src_cd attribute

Resolve the corresponding source name of the binary packages
where the XML attribute on_src_cd="False" is set.
Until now the binary name was used, which doesn't work when
the source name differs to the binary name of the package.
The forbiddenPackages list, containing the binary package names
will be resolved and the corresponding source package names
are stored in the forbiddenSrcPackages list which is then used
for the comparison inside the add_source_pkg function.

elbepack/cdroms.py

@@ -22,6 +22,7 @@
 
 def add_source_pkg(repo, component, cache, pkg, version, forbid):
     if pkg in forbid:
+        logging.info("Ignoring source package %s", pkg)
         return
     pkg_id = f'{pkg}-{version}'
     try:
@@ -56,6 +57,12 @@ def mk_source_cdrom(components, codename,
     for component in components.keys():
         rfs, cache, pkg_lst = components[component]
         logging.info('Adding %s component', component)
+
+        forbiddenSrcPackages = []
+        for name, _ in cache.get_corresponding_source_packages(forbiddenPackages):
+            if name not in forbiddenSrcPackages:
+                forbiddenSrcPackages.append(name)
+
         rfs.mkdir_p('/var/cache/elbe/sources')
         repo = CdromSrcRepo(codename, init_codename,
                             os.path.join(target, f'srcrepo-{component}'),
@@ -64,14 +71,14 @@ def mk_source_cdrom(components, codename,
         for pkg, version in pkg_lst:
             add_source_pkg(repo, component,
                            cache, pkg, version,
-                           forbiddenPackages)
+                           forbiddenSrcPackages)
 
         if component == 'main' and xml is not None:
             for p in xml.node('debootstrappkgs'):
                 pkg = XMLPackage(p)
                 srcpkgs = cache.get_corresponding_source_packages([pkg])
                 for srcpkg, srcpkg_ver in srcpkgs:
-                    add_source_pkg(repo, component, cache, srcpkg, srcpkg_ver, forbiddenPackages)
+                    add_source_pkg(repo, component, cache, srcpkg, srcpkg_ver, forbiddenSrcPackages)
 
     # elbe fetch_initvm_pkgs has downloaded all sources to
     # /var/cache/elbe/sources