[fix] do not use $final_path before it is defined

scripts/install

@@ -33,9 +33,6 @@ then
 	sudo swapon $tmp_swap_file
 fi
 
-# Create ffsync user
-sudo useradd ffsync -d $final_path
-
 # Copy files to the right place
 final_path=/opt/yunohost/ffsync
 sudo mkdir -p $final_path
@@ -43,10 +40,11 @@ sudo cp -a ../sources/* $final_path
 sudo cp ../conf/ffsync /etc/init.d/
 sudo cp ../conf/ffsync.logrotate /etc/logrotate.d/ffsync
 sudo touch /var/log/ffsync.log
-sudo chown ffsync /var/log/ffsync.log
 
 # Set permissions to ffsync directory
+sudo useradd ffsync -d $final_path
 sudo chown ffsync:ffsync -R $final_path
+sudo chown ffsync /var/log/ffsync.log
 
 # Modify Nginx configuration file and copy it to Nginx conf directory
 secret=$(head -c 20 /dev/urandom | sha1sum | cut -d " " -f1)