root password now set via ROOTPW env var

1 files changed, 10 insertions, 9 deletions

diff --git a/README.md b/README.md
index 5d2bacf..aefd6d9 100644
--- a/README.md
+++ b/README.md
@@ -7,13 +7,19 @@ Packer-based generation of reference systems using distro's ISOs.
 Packer => 0.12.2
 Download: https://www.packer.io/downloads.html
 
-## Usage: Creating base images
+## Usage
 
-The file 'base.json' contains default variables (VM, SSH) common to all templates.
-Thus it should always be included using packer's '-var-file' option.
+The file 'base.json' contains default variables (VM, SSH) common to all templates,
+and must always be included using packer's '-var-file' option.
+The root password is expected to be in the ROOTPW environment variable.
+The installation procedure will fail without it!
 
 Basic usage:
-	packer build -var-file=base.json <template>
+	ROOTPW=<password> packer build -var-file=base.json <template>
+
+For the rest of the examples, the root password is expected to be exported.
+
+## Usage: Creating base images
 
 Example: build Ubuntu 16.04.2 LTS template using qemu builder
 	packer build -var-file=base.json -only=qemu ubuntu-16.04-amd64.json
@@ -68,11 +74,6 @@ Variables set in base.json can be overriden using packer's '-var' options, e.g.:
 	packer build -var-file=base.json -var='headless=true' <template>
 (Make sure you first include base.json before overriding a variable!)
 
-Packer connects to the VM per SSH to provision them after the initial ISO installation.
-A default password is defined in base.json and the corresponding SHA-512 hashes are set
-in the kickstart/preseed files. If you change the 'ssh_password' make sure to change the
-hashes in the ks/ps files (generate with 'mkpasswd -m sha-512')!
-
 The partitioning of the virtual disk is done via kickstart/preseed files. Currently,
 a simple partition scheme is used: separate boot partition, rest a the main system
 partition labeled as SLX_SYS, using ext4 as filesystem. Other filesystems are also