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emulator: replace docker save/nuke/reload with in-place prune

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After flattening, reclaim intermediate layers with `docker rmi` +
`docker image prune -af` rather than round-tripping the final image
through a tar and wiping /var/lib/docker. The round-trip cost ~15 min
under same-arch TCG on the arm64 runner because every byte of the
image is read, written to tar, then read and written back. Relies on
the drive's `discard=on,detect-zeroes=unmap` + fstrim to return freed
clusters to the qcow2, which also lets the zero-fill `dd` go.
This commit is contained in:
Bilal Godil 2026-04-13 10:19:40 -07:00
parent 5c3c436489
commit 7c44097140
1 changed files with 6 additions and 18 deletions
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24
docker/local-emulator/qemu/cloud-init/emulator/user-data
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@ -399,28 +399,16 @@ write_files:
- stack-local-emulator:final
log "Flatten done."
log "Saving final image to /var/tmp..."
log "Pruning intermediate images in place..."
docker rm flatten
docker save stack-local-emulator:final -o /var/tmp/final-image.tar
mv /var/lib/docker/volumes /var/tmp/volumes-backup
log "Nuking Docker storage and reloading..."
systemctl stop docker containerd
rm -rf /var/lib/docker /var/lib/containerd
systemctl start docker containerd
until docker info >/dev/null 2>&1; do sleep 1; done
docker load -i /var/tmp/final-image.tar
docker rmi stack-local-emulator stack-local-emulator-slim || true
docker tag stack-local-emulator:final stack-local-emulator
docker rmi stack-local-emulator:final || true
rm -f /var/tmp/final-image.tar
systemctl stop docker
rm -rf /var/lib/docker/volumes
mv /var/tmp/volumes-backup /var/lib/docker/volumes
systemctl start docker
log "Docker storage rebuilt."
docker builder prune -af || true
docker image prune -af || true
log "Intermediate images pruned."
log "Zeroing free space for qcow2 compression..."
dd if=/dev/zero of=/zero.fill bs=1M 2>/dev/null || true
rm -f /zero.fill
log "Releasing free space for qcow2 compression (fstrim)..."
sync
fstrim -av 2>/dev/null || true
log "slim-docker-image done."