[mod] utils/searx.sh install: create branch if not already exists

This patch keeps an eye on:

1. When installing searx, the branch to install needs to be a local branch.
2. The branch to install can be different from the current branch.

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

.config.sh

@@ -28,7 +28,10 @@ fi
 # SEARX_INTERNAL_URL="127.0.0.1:8888"
 # SEARX_SETTINGS_TEMPLATE="${REPO_ROOT}/utils/templates/etc/searx/use_default_settings.yml"
 
-# Only change, if you maintain a searx brand in your searx fork.
+# Only change, if you maintain a searx brand in your searx fork (GIT_URL) which
+# is not hold by branch 'master'.  The branch has to be a local branch, in the
+# repository from which you install (which is most often the case).  If you want
+# to install branch 'foo', don't forget to run 'git branch foo origin/foo' once.
 # GIT_BRANCH="${GIT_BRANCH:-master}"
 
 # filtron.sh

utils/searx.sh

@@ -388,6 +388,14 @@ clone_searx() {
         err_msg "to clone searx sources, user $SERVICE_USER hast to be created first"
         return 42
     fi
+    if [[ ! $(git show-ref "refs/heads/${GIT_BRANCH}") ]]; then
+        warn_msg "missing local branch ${GIT_BRANCH}"
+        info_msg "create local branch ${GIT_BRANCH} from start point: origin/${GIT_BRANCH}"
+        git branch "${GIT_BRANCH}" "origin/${GIT_BRANCH}"
+    fi
+    if [[ ! $(git branch --show-current) == "${GIT_BRANCH}" ]]; then
+        warn_msg "take into account, installing branch $GIT_BRANCH while current branch is $(git branch --show-current)"
+    fi
     export SERVICE_HOME
     git_clone "$REPO_ROOT" "$SEARX_SRC" \
               "$GIT_BRANCH" "$SERVICE_USER"