# syntax=docker/dockerfile:1.4
# Dockhand Updater - BASELINE build (Alpine/musl, amd64 only)
#
# The normal updater (updater/Dockerfile) is Wolfi-based; Wolfi compiles its busybox
# and docker-cli for x86-64-v2 (SSE4.2/POPCNT). On older x86_64 CPUs without those
# instructions (TrueNAS, old Intel Atom/Celeron - the same hardware that needs the
# baseline Dockhand image) the Wolfi updater can't exec at all: the entrypoint's shell
# dies with "CPU does not support x86-64-v2", which Docker reports as exit 127 at the
# "Launching updater" step, so self-update is completely broken for baseline users.
#
# Alpine's musl busybox + docker-cli run on x86-64-v1, so the baseline updater is a
# plain Alpine image running the same /update.sh. amd64 only - baseline is a workaround
# for old x86_64 hardware, not an ARM concern.
#
# Rebuild trigger: the pipeline is change-gated on updater/, so touching this file
# forces a rebuild of the -baseline tag. (rebuild nonce: 2)
FROM alpine:3.21

# docker-cli (the stop/rm/rename/network/start the sidecar does) + busybox is the base
# Alpine shell, tar and date. That covers everything /update.sh needs.
RUN apk add --no-cache docker-cli

COPY update.sh /update.sh
RUN chmod +x /update.sh

ENTRYPOINT ["/update.sh"]