kojid: permit forcing releasever within mock per tag

builder/kojid

@@ -301,6 +301,8 @@ class BuildRoot(object):
             }
         if 'mock.module_setup_commands' in self.config['extra']:
             opts['module_setup_commands'] = self.config['extra']['mock.module_setup_commands']
+        if 'mock.releasever' in self.config['extra']:
+            opts['releasever'] = self.config['extra']['mock.releasever']
         if self.internal_dev_setup is not None:
             opts['internal_dev_setup'] = bool(self.internal_dev_setup)
         opts['tag_macros'] = {}

cli/koji_cli/commands.py

@@ -1149,6 +1149,8 @@ def anon_handle_mock_config(goptions, session, args):
         opts['use_bootstrap'] = buildcfg['extra']['mock.use_bootstrap']
     if 'mock.module_setup_commands' in buildcfg['extra']:
         opts['module_setup_commands'] = buildcfg['extra']['mock.module_setup_commands']
+    if 'mock.releasever' in buildcfg['extra']:
+        opts['releasever'] = buildcfg['extra']['mock.releasever']
     opts['tag_macros'] = {}
     for key in buildcfg['extra']:
         if key.startswith('rpm.macro.'):

docs/source/using_the_koji_build_system.rst

@@ -393,6 +393,8 @@ environment follows:
 * ``mock.new_chroot`` - 0/1 value. If it is set, ``--new-chroot`` or
   `--old-chroot` option is appended to any mock call. If it is not set,
   mock's default behavior is used.
+* ``mock.releasever`` - When doing cross-compiles it may be necessary
+  to explicitly set the ``releasever`` to be used.
 * ``mock.use_bootstrap`` - 0/1 value. If it is set, ``--bootstrap-chroot``
   is appended to the mock init call.  This tells mock to build in two stages,
   using chroot rpm for creating the build chroot. If it is not set, mock's

koji/__init__.py

@@ -1638,6 +1638,8 @@ def genMockConfig(name, arch, managed=False, repoid=None, tag_name=None, **opts)
         config_opts['use_bootstrap'] = bool(opts['use_bootstrap'])
     if 'module_setup_commands' in opts:
         config_opts['module_setup_commands'] = opts['module_setup_commands']
+    if 'releasever' in opts:
+        config_opts['releasever'] = opts['releasever']
 
     # bind_opts are used to mount parts (or all of) /dev if needed.
     # See kojid::LiveCDTask for a look at this option in action.