repo: Make install.sh script reusable

Thanks to using install.rc it is possible to easily select any playbook
to be used during the installation.

repo/centos-7.4/erp5-standalone-offline/README.md

@@ -27,6 +27,9 @@ Building
 
 Compile ERP5 with erp5-standalone script.
 
+Note: You can modify `install.rc` and use different playbook, than keep in mind
+to use proper script or just a playbook in above step.
+
 Go to ``~/rpmbuild/SPECS``.
 
 Build all RPMs with:
@@ -40,7 +43,12 @@ Usage - instruction to user installing with RPMs
 
 Required machine is CentOS 7.4 with at least Netinstall.
 
-Provide all RPMs with `install.sh` in one directory (eg. tarball).
+Create tarball with:
+
+ * `install.sh`
+ * `install.rc`
+ * RPMs generated
+ * slapos.node RPM
 
 Ask user to run `install.sh` as `root`.
 

repo/centos-7.4/erp5-standalone-offline/install.rc

+PLAYBOOK=erp5-standalone.yml
\ No newline at end of file

repo/centos-7.4/erp5-standalone-offline/install.sh

-#!/bin/sh
+#!/bin/bash
+
+source install.rc
+
 LOG_FILE=install.log
 
 echo -n "Started at " >> $LOG_FILE 2>&1
@@ -31,7 +34,7 @@ echo "done."
 
 echo -n "Instantiating ERP5 instance..."
 for i in `seq 10` ; do
-  ansible-playbook /opt/slapos.playbook/erp5-standalone.yml >> $LOG_FILE 2>&1
+  ansible-playbook /opt/slapos.playbook/$PLAYBOOK >> $LOG_FILE 2>&1
   ANSIBLE_RESULT=$?
   if [ "$ANSIBLE_RESULT" == "0" ] ; then
     break