Don't overwrite environment variables

config.sh

@@ -1,11 +1,20 @@
 # The name of the frontend, like indicated in /etc/hosts
-FRONTEND_HOSTNAME="phobos"
+if [ -z "$FRONTEND_HOSTNAME" ]
+then
+    export FRONTEND_HOSTNAME="phobos"
+fi
 
 # Username of the unpriviledge user that runs scripts
 SYNCHRO_USER="synchro"
 
 # Directory where backup should be made
-TO_BCKP="/mnt/backup"
+if [ -z "$TO_BCKP" ]
+then
+    TO_BCKP="/mnt/backup"
+fi
 
 # Password of the MySQL user backup (with RO rights)
-BCKP_PASS="Riuy6of sae^W0Sh"
+if [ -z "$BCKP_PASS" ]
+then
+    BCKP_PASS="Riuy6of sae^W0Sh"
+fi