fix hostname condition

debian/postinst

@@ -48,7 +48,7 @@ case "$1" in
 	su ${gitlab_user} -s /bin/sh -c 'git config --global core.autocrlf "input"'
 	cd ${gitlab_home}
 	db_get gitlab/fqdn
-            if [ "${RET}" = "true" ]; then
+            if [ "${RET}" != "" ]; then
                 db_go
                 if ! grep GITLAB_HOST /etc/gitlab/gitlab-debian.conf
                 then
@@ -57,6 +57,9 @@ case "$1" in
                     echo export GITLAB_EMAIL_DISPLAY_NAME="Gitlab" >> /etc/gitlab/gitlab-debian.conf
                     echo export GITLAB_EMAIL_REPLY_TO="no-reply@${RET}" >> /etc/gitlab/gitlab-debian.conf
                 fi
+	    else
+	    	echo "Failed to retrieve fully qualified domain name"
+		exit 1
             fi
 	db_stop