fix setup when the branch is not the default one

fix a bug introduced in 832f725
this fix the deploy setup when the branch is different from the default one

deploy

@@ -201,12 +201,14 @@ hook_pre_setup() {
 setup() {
   local path=`config_get path`
   local repo=`config_get repo`
+  local ref=`config_get ref`
+  local branch=${ref##*/}
   hook_pre_setup || abort pre-setup hook failed
   run "mkdir -p $path/{shared/{logs,pids},source}"
   test $? -eq 0 || abort setup paths failed
   log running setup
   log cloning $repo
-  run "git clone --depth=5 $repo $path/source"
+  run "git clone --depth=5 --branch $branch $repo $path/source"
   test $? -eq 0 || abort failed to clone
   run "ln -sfn $path/source $path/current"
   test $? -eq 0 || abort symlink failed