Deploy: push before building, and tag images with the commit

deploy.sh no longer needs a manual push before it, and no made-up tag:

- It pushes the current branch, refuses a dirty tracked tree, and requires
  HEAD == origin/main before anything is built, so the image can only be
  built for a commit the remote actually has. --force and --no-push skip the
  guards.
- The image is tagged :<commit> as well as :latest, and ansible takes
  -e image_tag=<commit>, so a deploy pins the exact revision; rollback is the
  same play with an older commit.
- Makefile builds `git archive HEAD` instead of cloning the remote (the push
  guard makes the local commit the remote state) and defaults PLATFORM to
  linux/arm64, because emily is aarch64 — the same default mozimo uses. Drop
  build-check-local; build-check already builds the committed tree.

deploy.sh

@@ -1,15 +1,63 @@
 #!/usr/bin/env bash
+#
+# The Great Bear deploy — push the current commit, build it with podman, and
+# install the Quadlet unit on emily with ansible.
+#
+# The image is built from the committed tree (`git archive HEAD`) and tagged
+# with its commit id, so what runs on the host is exactly what git knows about.
+#
+#   ./deploy.sh              deploy HEAD (tracked tree must be clean and pushed)
+#   ./deploy.sh --force      skip the guards (know what you are doing)
+#   ./deploy.sh --no-push    skip the push, if you already pushed
+#
+# Log in to the registry once beforehand: podman login registry.tanshu.com
 set -euo pipefail
+cd "$(dirname "${BASH_SOURCE[0]}")"
 
-parent_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" || exit ; pwd -P )
-cd "$parent_path" || exit
+BRANCH="${BRANCH:-main}"
+
+FORCE=false
+NO_PUSH=false
+for arg in "$@"; do
+	case "$arg" in
+	--force) FORCE=true ;;
+	--no-push) NO_PUSH=true ;;
+	*)
+		echo "Usage: $0 [--force] [--no-push]" >&2
+		exit 1
+		;;
+	esac
+done
+
+# The build takes HEAD, so push first: otherwise the registry collects an image
+# for a commit that exists only on this machine.
+if [ "$NO_PUSH" != true ]; then
+	echo "==> pushing"
+	git push
+fi
+
+# Guards. Only tracked-file state matters — untracked and ignored files never
+# enter a `git archive HEAD` build. HEAD must match origin/$BRANCH so the commit
+# the image is tagged with is one the remote actually has.
+if [ "$FORCE" != true ]; then
+	if [ -n "$(git status --porcelain --untracked-files=no)" ]; then
+		echo "x tracked files modified - commit or stash first (or --force)" >&2
+		exit 1
+	fi
+	git fetch origin --quiet
+	if [ "$(git rev-parse HEAD)" != "$(git rev-parse "origin/$BRANCH")" ]; then
+		echo "x HEAD != origin/$BRANCH - push or pull first (or --force)" >&2
+		exit 1
+	fi
+fi
+
+TAG=$(git rev-parse --short HEAD)
+echo "==> deploying commit $TAG"
 
 echo "========================================================"
 echo " Building & Uploading Container Image (Podman)"
 echo "========================================================"
-current_version="${1:-latest}"
-make build-production TAG="$current_version"
-
+make build-production COMMIT="$TAG"
 
 echo ""
 echo "========================================================"
@@ -19,5 +67,6 @@ echo "========================================================"
 # connecting user, so it must connect as that user and must NOT become root.
 # `-u` is the account that owns ~/.config/containers/systemd on the target.
 deploy_user="${ANSIBLE_USER:-tanshu}"
-cd "$parent_path/ansible" || exit
-ansible-playbook -u "$deploy_user" playbook.yml -e "tag=$current_version"
+cd ansible || exit
+# image_tag pins the exact commit; rollback is -e image_tag=<older-commit>.
+ansible-playbook -u "$deploy_user" playbook.yml -e "image_tag=$TAG"