diff --git a/src/app/Dockerfile b/src/app/Dockerfile
index b602de2..553e20b 100644
--- a/src/app/Dockerfile
+++ b/src/app/Dockerfile
@@ -26,6 +26,12 @@ ADD backup.sh /etc/periodic/weekly/backup
 ADD config.docker.php ${SCRIPT_ROOT}
 ADD build-prepare.sh ${SCRIPT_ROOT}
 
+ARG ORIGIN_REPO_MAIN=https://git.tt-rss.org/fox/tt-rss.git
+ARG ORIGIN_REPO_XACCEL=https://git.tt-rss.org/fox/ttrss-nginx-xaccel.git
+
+ENV ORIGIN_REPO_MAIN=${ORIGIN_REPO_MAIN}
+ENV ORIGIN_REPO_XACCEL=${ORIGIN_REPO_XACCEL}
+
 RUN sh -c ${SCRIPT_ROOT}/build-prepare.sh
 
 ENV OWNER_UID=1000
diff --git a/src/app/build-prepare.sh b/src/app/build-prepare.sh
index 5e5a5c2..2af037c 100755
--- a/src/app/build-prepare.sh
+++ b/src/app/build-prepare.sh
@@ -1,10 +1,15 @@
-#!/bin/sh
+#!/bin/sh -e
 
 DST_DIR=/src/tt-rss
 
 mkdir -p $DST_DIR
 
-git clone --branch master --depth 1 https://git.tt-rss.org/fox/tt-rss.git $DST_DIR
-git clone --branch master --depth 1 https://git.tt-rss.org/fox/ttrss-nginx-xaccel.git $DST_DIR/plugins.local/nginx_xaccel
+echo cloning $ORIGIN_REPO_MAIN to $DST_DIR...
+git clone --branch master --depth 1 $ORIGIN_REPO_MAIN $DST_DIR
+echo built for: $(git --git-dir=$DST_DIR/.git --no-pager log --pretty='%H' -n1 HEAD)
+
+echo cloning $ORIGIN_REPO_XACCEL to $DST_DIR/plugins.local/nginx_xaccel...
+git clone --branch master --depth 1 $ORIGIN_REPO_XACCEL $DST_DIR/plugins.local/nginx_xaccel
+echo built for: $(git --git-dir=$DST_DIR/plugins.local/nginx_xaccel/.git --no-pager log --pretty='%H' -n1 HEAD)
 
 mkdir -p /var/www