macos13: add build-image.sh (#3)

Author: delan

README.md

@@ -197,6 +197,7 @@ To build the base vm, first build a clean image:
 - When the script finishes, press **Cmd**+**Q**
 - Shut down the guest: `virsh shutdown servo-macos13.clean`
 - Take another snapshot: `zfs snapshot tank/base/servo-macos13.clean@automated`
+- Enable per-snapshot block devices for the zvol: `zfs set snapdev=visible tank/base/servo-macos13.clean`
 - Clone the clean zvol/guest to create the base zvol/guest:
     - `zfs clone tank/base/servo-macos13{.clean@automated,}`
     - `virt-clone --preserve-data --check path_in_use=off -o servo-macos13.clean -n servo-macos13 --nvram /var/lib/libvirt/images/OSX-KVM/OVMF_VARS.servo-macos13.fd --skip-copy sda -f /dev/zvol/tank/base/servo-macos13 --skip-copy sdc`

macos13/build-image.sh

@@ -0,0 +1,67 @@
+#!/usr/bin/env zsh
+# usage: macos13/build-image.sh <snapshot_name>
+image_dir=${0:a:h}
+script_dir=${0:a:h}/..
+. "$script_dir/common.sh"
+trap print_undo_commands EXIT
+cache_dir=$script_dir/cache
+. "$script_dir/download.sh"
+. "$script_dir/inject.sh"
+undo_commands=$(mktemp)
+image_name=servo-macos13
+snapshot_name=$1; shift
+
+>&2 echo '[*] Caching downloads'
+download "$cache_dir" https://cloud-images.ubuntu.com/jammy/20241217/jammy-server-cloudimg-amd64.img 0d8345a343c2547e55ac815342e6cb4a593aa5556872651eb47e6856a2bb0cdd
+
+>&2 echo '[*] Creating zvol (if needed)'
+# TODO: find a more efficient way to do an idempotent zfs-clone(8) that retains the clone’s old snapshots?
+zfs list -Ho name "$SERVO_CI_ZFS_CLONE_PREFIX/$image_name" || zfs create -V 90G "$SERVO_CI_ZFS_CLONE_PREFIX/$image_name"
+
+>&2 echo '[*] Creating libvirt guest (or recreating it with new config)'
+if virsh domstate -- "$image_name"; then
+    virsh destroy -- "$image_name" || :  # FIXME make this idempotent in a less noisy way?
+    virsh undefine --nvram -- "$image_name"
+fi
+virt-clone --preserve-data --check path_in_use=off -o "$image_name.clean" -n "$image_name" --nvram /var/lib/libvirt/images/OSX-KVM/OVMF_VARS.$image_name.fd --skip-copy sda -f /dev/zvol/$SERVO_CI_ZFS_CLONE_PREFIX/$image_name --skip-copy sdc
+cp /var/lib/libvirt/images/OSX-KVM/OVMF_VARS.{$image_name.clean,$image_name}.fd
+
+>&2 echo '[*] Writing disk image'
+# TODO: find a more efficient way to do an idempotent zfs-clone(8) that retains the clone’s old snapshots?
+dd status=progress bs=1M if="/dev/zvol/$SERVO_CI_ZFS_CLONE_PREFIX/$image_name.clean@automated" of="/dev/zvol/$SERVO_CI_ZFS_CLONE_PREFIX/$image_name"
+
+>&2 echo '[*] Forcing update of partition block device geometry'
+# Dec 20 17:12:59 jupiter kernel: EXT4-fs (zd16p1): bad geometry: block count 23564539 exceeds size of device (548091 blocks)
+blockdev --rereadpt "/dev/zvol/$SERVO_CI_ZFS_CLONE_PREFIX/$image_name"
+sleep 1
+
+>&2 echo '[*] Waiting for partition block device to appear'
+partition_block_device=/dev/zvol/$SERVO_CI_ZFS_CLONE_PREFIX/$image_name-part1
+t=0; while ! test -e $partition_block_device; do
+    if [ $t -ge $SERVO_CI_ZVOL_BLOCK_DEVICE_TIMEOUT ]; then
+        >&2 printf '[!] Timed out waiting for block device: %s' $partition_block_device
+        exit 1
+    fi
+    sleep 1
+    t=$((t+1))
+done
+
+>&2 echo '[*] Configuring base image'
+./mount-runner.sh "$image_name" "$image_dir/configure-base.sh"
+
+>&2 echo '[*] Starting guest, to apply changes'
+virsh start "$image_name"
+
+>&2 echo '[*] Waiting for guest to shut down (max 2000 seconds)'  # normally ~850 seconds
+if ! time virsh event --timeout 2000 -- "$image_name" lifecycle; then
+    >&2 echo 'virsh event timed out!'
+    exit 1
+fi
+
+>&2 echo '[*] Checking that Servo was built correctly'
+./mount-runner.sh "$image_name" sh -c 'ls init/built_servo_once_successfully'
+
+>&2 echo "[*] Taking zvol snapshot: $SERVO_CI_ZFS_CLONE_PREFIX/$image_name@$snapshot_name"
+zfs snapshot "$SERVO_CI_ZFS_CLONE_PREFIX/$image_name@$snapshot_name"
+
+>&2 echo '[*] Done!'