add packer to build arch image on hetzner

packer/.gitignore

@@ -0,0 +1,6 @@
+*-manifest.json
+*.pem
+*.sig
+*.asc
+secret*
+

packer/archlinux.pkr.hcl

@@ -1,6 +1,6 @@
 variable "extra-packages" {
   type    = list(string)
-  default = []
+  default = ["python","sudo","inetutils","zsh"]
 }
 
 variable "hcloud-servertype" {

packer/files/archlinux/install.sh

@@ -34,7 +34,7 @@ set -euo pipefail
 echo 'Server = ${ARCH_MIRROR}/\$repo/os/\$arch' > /etc/pacman.d/mirrorlist
 pacman-key --init
 pacman-key --populate archlinux
-pacstrap  /mnt base linux grub nano btrfs-progs openssh curl jq python-yaml $EXTRA_PACKAGES
+pacstrap  /mnt base linux grub nano btrfs-progs openssh curl jq python-yaml systemd-resolvconf  $EXTRA_PACKAGES
 
 # fstab
 genfstab -U /mnt > /mnt/etc/fstab
@@ -53,7 +53,9 @@ hwclock --systohc
 # locale
 echo 'KEYMAP=${KEYMAP}' > /etc/vconsole.conf
 echo '${LOCALE} UTF-8' > /etc/locale.gen
-echo 'LANG=${LOCALE}' > /etc/locale.conf
+if [ "$LOCALE" != "en_US.UTF-8" ]; then
+  echo 'en_US.UTF-8 UTF8' >> /etc/locale.gen
+fi
 locale-gen
 
 # network
@@ -79,10 +81,15 @@ done
 # misc
 systemctl set-default multi-user.target
 usermod -L root
+useradd -m -s /bin/bash ansible
+mkdir /home/ansible/.ssh
+echo 'ansible ALL = (ALL) NOPASSWD:ALL' > /etc/sudoers.d/ansible
+
 echo 'archlinux' > /etc/hostname
 
 EOF
 
+ln -sf ../run/systemd/resolve/stub-resolv.conf /mnt/etc/resolv.conf
 # clean up
 rm /mnt/root/.bash_history
 rm -r /mnt/var/cache/*

packer/files/archlinux/root/etc/systemd/system/hcloud-ssh-keys.service

@@ -8,7 +8,7 @@ ConditionPathExists=!/root/.ssh/authorized_keys
 Type=oneshot
 DynamicUser=yes
 ExecStart=/usr/bin/jq -r '.ssh_keys|join("\n")' /etc/hcloud-metadata.json
-StandardOutput=truncate:/root/.ssh/authorized_keys
+StandardOutput=truncate:/home/ansible/.ssh/authorized_keys
 
 [Install]
 WantedBy=multi-user.target