Update 'debian-setup.sh'

debian-setup.sh

@@ -3,19 +3,31 @@
 ### configuration ###
 admin_user="newnius"
 
-
 #####################
 
-# check environment
+# check permission
 if [ "$EUID" -ne 0 ]; then
-  echo "[ERROR] Please run as root"
+  echo "[ERROR] Please run with user root"
   exit 1
 fi
 
-if ! hash apt 2>/dev/null; then
-  echo "[ERROR] Only debian is supported"
+# check OS
+file=/etc/apt/sources.list
+if ! test -f "${file}"; then
+  echo "[ERROR] Only Debian is supported"
   exit 1
 fi
+if ! grep -q debian "${file}"; then
+  echo "[ERROR] Only Debian is supported"
+  exit 1
+fi
+
+# check do once
+file=/etc/passwd
+if grep -q ${admin_user} "${file}"; then
+  echo "[ERROR] OS is already setup"
+  exit 0
+fi
 
 
 # install security updates
@@ -24,9 +36,10 @@ apt update
 #uncomment as it may prompt update grub window
 #apt upgrade -y
 
+
 # install necessary tools
 echo "[INFO] Installing necessary tools"
-apt install -y curl vim git sudo ca-certificates apt-transport-https haveged
+apt install -y curl vim git sudo ca-certificates apt-transport-https haveged tree
 
 # install ssh service
 if ! hash sshd 2>/dev/null; then
@@ -37,16 +50,13 @@ fi
 # Add admin user
 echo "[INFO] Creating admin user"
 ssh_pass=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 32)
-
 useradd $admin_user -m -s /bin/bash
 echo $admin_user:$ssh_pass | chpasswd
 
-
 # Add to sudoers
 sed -i "/$admin_user/d" /etc/sudoers
 sed -i "/User privilege specification/a $admin_user\tALL=(ALL:ALL) ALL" /etc/sudoers
 
-
 # update root password to random and forget it
 echo "[INFO] Updating root password to random"
 pass=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 32)