turnkey: add hostname & Fix TUN access (#6512)

* Update turnkey.sh

Allow choosing container ID & add tun device access to the container. Also notify user that the credentials are stored in a file on the host machine.

* Update turnkey.sh

fixed how tun access is added by instead modifying the conf file of the container. Also added filtering to only add tun access if required. A few other minor verbiage changes/corrections.

* Update turnkey.sh

Corrected variable expansion.

turnkey/turnkey.sh

@@ -98,11 +98,14 @@ turnkey=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "TurnKey LXCs
 
 # Setup script environment
 PASS="$(openssl rand -base64 8)"
-CTID=$(pvesh get /cluster/nextid)
+# Prompt user to confirm container ID
+  CTID=$(whiptail --backtitle "Container ID" --title "Choose the Container ID" --inputbox "Enter the conatiner ID..." 8 40 $(pvesh get /cluster/nextid) 3>&1 1>&2 2>&3)
+# Prompt user to confirm Hostname
+  HOST_NAME=$(whiptail --backtitle "Hostname" --title "Choose the Hostname" --inputbox "Enter the containers Hostname..." 8 40 "turnkey-${turnkey}" 3>&1 1>&2 2>&3)
 PCT_OPTIONS="
     -features keyctl=1,nesting=1
-    -hostname turnkey-${turnkey}
-    -tags proxmox-helper-scripts
+    -hostname $HOST_NAME
+    -tags community-script
     -onboot 1
     -cores 2
     -memory 2048
@@ -199,6 +202,15 @@ pct create $CTID ${TEMPLATE_STORAGE}:vztmpl/${TEMPLATE} ${PCT_OPTIONS[@]} >/dev/
 # Save password
 echo "TurnKey ${turnkey} password: ${PASS}" >>~/turnkey-${turnkey}.creds # file is located in the Proxmox root directory
 
+# If turnkey is "OpenVPN", add access to the tun device
+TUN_DEVICE_REQUIRED=("openvpn") # Setup this way in case future turnkeys also need tun access
+if printf '%s\n' "${TUN_DEVICE_REQUIRED[@]}" | grep -qw "${turnkey}"; then
+  info "${turnkey} requires access to /dev/net/tun on the host. Modifying the container configuration to allow this."
+  echo "lxc.cgroup2.devices.allow: c 10:200 rwm" >> /etc/pve/lxc/${CTID}.conf
+  echo "lxc.mount.entry: /dev/net/tun dev/net/tun none bind,create=file 0 0" >> /etc/pve/lxc/${CTID}.conf
+  sleep 5
+fi
+
 # Start container
 msg "Starting LXC Container..."
 pct start "$CTID"
@@ -239,4 +251,5 @@ info "Proceed to the LXC console to complete the setup."
 echo
 info "login: root"
 info "password: $PASS"
+info "(credentials also stored in the root user's root directory in the 'turnkey-${turnkey}.creds' file.)"
 echo