get bootstrap hostname from uefi variable

perryflynn · Apr 17, 2024 · f5c6d6c · f5c6d6c
1 parent ebfee37
commit f5c6d6c
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diff --git a/README.md b/README.md
@@ -22,6 +22,24 @@ a Dockerfile and some scripts to build a custom Arch Linux installer iso with ad
 - `./archiso/build.sh` builds the container image
 - `./archiso/pack.sh` runs the container image to build the Arch Linux ISO image
 
+## Automatic hostname detection
+
+The `perrys-bootstrapper.sh` script is using UEFI variables to fetch the hostname from the system and use the
+correct ansible inventory variables.
+
+Set hostname in UEFI variable:
+
+```sh
+echo -n wuseldusel > efi-hostname
+efivar --name ed38a5bf-1135-4b0f-aa72-49d30b05dfd4-PerryHostname -w -f efi-hostname
+```
+
+Get the hostname from UEFI variable:
+
+```sh
+cat /sys/firmware/efi/efivars/PerryHostname-ed38a5bf-1135-4b0f-aa72-49d30b05dfd4
+```
+
 ## How to install a OS
 
 - Build the Arch Linux ISO image

diff --git a/bootstrap.sh b/bootstrap.sh
@@ -5,10 +5,13 @@ set -e
 
 export PYTHONUNBUFFERED=1
 
+UEFI_HOSTNAME="/sys/firmware/efi/efivars/PerryHostname-ed38a5bf-1135-4b0f-aa72-49d30b05dfd4"
+
 # Arguments
 ARG_HELP=0
 UNKNOWN_OPTION=0
 ARG_FLAVOR=archlinux
+ARG_HOSTNAME=""
 
 # Arguments from cli
 if [ $# -ge 1 ]
@@ -21,6 +24,10 @@ then
                 shift
                 ARG_FLAVOR=$1
                 ;;
+            --hostname)
+                shift
+                ARG_HOSTNAME=$1
+                ;;
             -h|--help)
                 ARG_HELP=1
                 ;;
@@ -51,18 +58,35 @@ then
     echo
     echo "Usage: $0 --flavor [debian|archlinux]"
     echo
-    echo "-h, --help         Print this help"
-    echo "--flavor os        OS to bootstrap"
-    echo "                   one of 'debian' or 'archlinux'"
+    echo "-h, --help          Print this help"
+    echo "--hostname myhost   Override hostname of bootstrapped OS"
+    echo "--flavor os         OS to bootstrap"
+    echo "                    one of 'debian' or 'archlinux'"
     echo
     exit
 fi
 
-loadkeys de
+# Set hostname
 hostnamectl hostname "${ARG_FLAVOR}iso"
 
+# Expand disk size
 mount -o remount,size=2G /run/archiso/cowspace
+
+# Install tools
 pacman --noconfirm --needed -Sy archlinux-keyring
 pacman --noconfirm --needed -S ansible git
 
-ansible-pull -U https://github.com/perryflynn/iac.git -C dev -l "bootstrap-$ARG_FLAVOR"
+# Build arguments
+extraargs=()
+
+if [ -n "$ARG_HOSTNAME" ]; then
+    extraargs+=( "{ \"hostname\": \"$ARG_HOSTNAME\" }" )
+elif [ -f "$UEFI_HOSTNAME" ]
+    extraargs+=( "{ \"hostname\": \"$(cat "$UEFI_HOSTNAME")\" }" )
+fi
+
+# Run ansible
+ansible-pull \
+    -U https://github.com/perryflynn/iac.git -C dev \
+    -l "bootstrap-$ARG_FLAVOR" \
+    "${extraargs[@]}"
diff --git a/inventory/defaults.yml b/inventory/defaults.yml
@@ -93,5 +93,9 @@ all:
     configuration:
       hosts:
 
-        # retired Thinkpad X230 Laptop
+        # Default hostnames
         mydemoarch:
+        mydemodebian:
+
+        # retired Thinkpad X230 Laptop
+        retired:
diff --git a/local.yml b/local.yml
@@ -10,6 +10,10 @@
           - bootmode == 'uefi' or bootmode == 'bios'
           - flavor == 'debian' or flavor == 'archlinux'
 
+    - name: Show hostname to use
+      debug:
+        var: hostname
+
     - name: Set timezone
       timezone:
         name: "{{timezone}}"