make mock depsolver policy configurable

Fixes: https://pagure.io/koji/issue/826

builder/kojid

@@ -290,6 +290,8 @@ class BuildRoot(object):
             opts['package_manager'] = self.config['extra']['mock.package_manager']
         if 'mock.yum.module_hotfixes' in self.config['extra']:
             opts['module_hotfixes'] = self.config['extra']['mock.yum.module_hotfixes']
+        if 'mock.yum.best' in self.config['extra']:
+            opts['yum_best'] = int(self.config['extra']['mock.yum.best'])
         # Append opts['plugin_conf'] to enable Mock package signing
         if 'mock.plugin_conf.sign_enable' in self.config['extra']:
             # check rest of configuration

cli/koji_cli/commands.py

@@ -1024,6 +1024,8 @@ def anon_handle_mock_config(goptions, session, args):
         opts['package_manager'] = buildcfg['extra']['mock.package_manager']
     if 'mock.yum.module_hotfixes' in buildcfg['extra']:
         opts['module_hotfixes'] = buildcfg['extra']['mock.yum.module_hotfixes']
+    if 'mock.yum.best' in buildcfg['extra']:
+        opts['yum_best'] = int(buildcfg['extra']['mock.yum.best'])
     if 'mock.bootstrap_image' in buildcfg['extra']:
         opts['use_bootstrap_image'] = True
         opts['bootstrap_image'] = buildcfg['extra']['mock.bootstrap_image']

koji/__init__.py

@@ -1641,6 +1641,8 @@ name=build
         yc_parts.append("        %s\n" % url)
     if opts.get('module_hotfixes'):
         yc_parts.append("module_hotfixes=1\n")
+    if opts.get('yum_best'):
+        yc_parts.append("best=%s\n" % int(opts['yum_best']))
     config_opts['yum.conf'] = ''.join(yc_parts)
 
     plugin_conf = {