cros_workon: only touch local_manifest for minilayout users

cros_workon

Index: cros_workon
diff --git a/cros_workon b/cros_workon
index d71879f9304f46590695a8acfa78ea5205420dca..6892e7a669e36ef947b4558009ac78f9da324fb1 100755
--- a/cros_workon
+++ b/cros_workon
@@ -136,23 +136,14 @@ show_live_ebuilds () {
   sed -n 's/^[~=]\(.*\)-9999$/\1/p' "${WORKON_FILE}"
 }
 
-find_repo_dir () {
-  curdir=`pwd`
-  while [ $curdir != / ]; do
-    if [ -d "$curdir/.repo" ]; then
-       #echo "Found .repo directory at ${curdir}"
-       REPODIR=${curdir}/.repo
-       return 0
-    fi
-    curdir=`dirname "$curdir"`
-  done
-  echo "Unable to find .repo directory. Did you checkout with repo?"
-  exit 1
-}
-
-
 # This is called only for "cros-workon start". We dont handle the "stop" case since the local changes are ignored anyway since the 9999.ebuild is masked and we dont want to deal with what to do with the user's local changes.
 regen_manifest_and_sync() {
+  # Nothing to do unless you are working on the minilayout
+  local manifest=${CHROOT_TRUNK_DIR}/.repo/manifest.xml
+  if [ $(basename $(readlink -f ${manifest})) != "minilayout.xml" ]; then
+      return
+  fi
+
   for pkgname in $(show_live_ebuilds); do
     eval $(${EBUILDCMD} $(${EQUERYCMD} which ${pkgname}) info)
     local srcdir=$(readlink -m ${CROS_WORKON_SRCDIR})