additional bash programming to support a json configuration file.

still working on kernel options for proper networking.

config/apply_initial_host_configuration.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+set -e
+set -x
+echo 'initial configuration'
+# Parse the JSON file
+while IFS="=" read -r key value; do
+  declare "$key=$value"
+done < <(jq -r 'to_entries|map("\(.key)=\(.value|tostring)")|.[]' config.json)
+
+echo "$hostname" > /etc/hostname
+echo "127.0.0.1 $hostname"> /etc/hosts
+
+echo "$timezone" > /etc/timezone
+ln -sf /usr/share/zoneinfo/America/Los_Angeles /etc/localtime
+
+# Set the root password
+echo "root:$root_password" | chpasswd
+
+#set additional profile options.
+jq --compact-output -r '.profile[]' config.json | while read -r line; do
+  echo "$line" >> /etc/profile
+done
+
+echo "export PATH=$PATH:/usr/local/go/bin" >> /etc/profile
+
+#set default shell to bash.
+sed -i 's|^SHELL=.*|SHELL=/bin/bash|' /etc/default/useradd
+
+user_mod() {
+  echo "$1"
+  username=$(echo "$1" | jq -r '.username')
+  password=$(echo "$1" | jq -r '.password')
+
+  # Create user
+  if getent passwd "$username" >/dev/null 2>&1; then
+    echo "User already exists"
+  else
+    useradd -m "$username"
+  fi   
+
+  # Set password
+  echo "$username:$password" | chpasswd
+
+  # Add to sudo group
+  usermod -aG sudo "$username"
+}
+jq --compact-output -r '.users[]' config.json | while read -r line; do
+  user_mod "$line"
+done
+echo "Configuration applied."