Specify shell while run me as git user

Some users disabled "git" user's shell after finished installation, this
will lead to "This account is currently not available" and could not
run /etc/init.d/gitlab, this dirty trick fix it.
Signed-off-by: Drunkard Zhang <gongfan193@gmail.com>

lib/support/init.d/gitlab

@@ -35,13 +35,14 @@ pid_path="$app_root/tmp/pids"
 socket_path="$app_root/tmp/sockets"
 web_server_pid_path="$pid_path/unicorn.pid"
 sidekiq_pid_path="$pid_path/sidekiq.pid"
+shell_path="/bin/bash"
 
 # Read configuration variable file if it is present
 test -f /etc/default/gitlab && . /etc/default/gitlab
 
 # Switch to the app_user if it is not he/she who is running the script.
 if [ "$USER" != "$app_user" ]; then
-  eval su - "$app_user" -c $(echo \")$0 "$@"$(echo \"); exit;
+  eval su - "$app_user" -s $shell_path -c $(echo \")$0 "$@"$(echo \"); exit;
 fi
 
 # Switch to the gitlab path, exit on failure.

lib/support/init.d/gitlab.default.example

@@ -29,3 +29,9 @@ web_server_pid_path="$pid_path/unicorn.pid"
 # sidekiq_pid_path defines the path in which to create the pid file for sidekiq
 # The default is "$pid_path/sidekiq.pid"
 sidekiq_pid_path="$pid_path/sidekiq.pid"
+
+# shell_path defines the path of shell for "$app_user" in case you disabled
+# shell of "$app_user" by commands like `usermod -s /sbin/nologin $app_user"
+# for security decision.
+# The default is "/bin/bash"
+shell_path="/bin/bash"