Deploy workflow: commit-id image tags, guarded deploy.sh, opt-in prune

- Makefile builds from 'git archive HEAD' (stale-remote-HEAD impossible):
  tags registry.tanshu.com/mozimo:<short-commit> + :main; build-check target
  verifies both architectures without pushing
- deploy.sh: refuses dirty tracked tree / HEAD != origin/main (--force to
  bypass), ff-only pull, passes the commit as image_tag to ansible,
  --prune flag for opt-in image cleanup
- ansible: docker_image uses image_tag extra-var (falls back to tag),
  prune task keeps the 3 newest mozimo images, mozimo-repo only

Makefile

@@ -1,8 +1,19 @@
+COMMIT ?= $(shell git rev-parse --short HEAD)
+
 .PHONY: build-production
-build-production: ## Build the production docker image.
-	@docker buildx build \
+build-production: ## Multi-arch build from HEAD; tags registry.tanshu.com/mozimo:<commit> + :main
+	@git archive --format=tar HEAD | docker buildx build \
 		--platform linux/amd64,linux/arm64 \
-		--tag registry.tanshu.com/mozimo:staging \
-		$(if $(TAG),--tag registry.tanshu.com/mozimo:$(TAG)) \
+		--tag registry.tanshu.com/mozimo:$(COMMIT) \
+		--tag registry.tanshu.com/mozimo:main \
 		--push \
-		git@git.tanshu.com:tanshu/mozimo.in.git
+		-
+
+.PHONY: build-check
+build-check: ## Multi-arch compile check from HEAD, nothing pushed
+	@git archive --format=tar HEAD | docker buildx build \
+		--platform linux/amd64,linux/arm64 \
+		--tag mozimo:check \
+		--pull \
+		--progress=plain \
+		-

ansible/roles/mozimo/tasks/main.yaml

@@ -31,3 +31,10 @@
       - "{{ host_directory }}/pb_data:/app/pb_data"
     networks:
       - name: "{{ docker_network }}"
+
+- name: Prune old mozimo images, keep newest 3 (opt-in via ./deploy.sh --prune)
+  ansible.builtin.shell: >
+    docker images "registry.tanshu.com/mozimo" --format "{{.ID}}" | tail -n +4 | xargs -r docker rmi
+  when: mozimo_image_prune | default(false) | bool
+  failed_when: false
+  changed_when: true

ansible/vars/default.yml

@@ -12,7 +12,9 @@ host: "staging.mozimo.in"
 
 docker_network: "{{ title }}_net"
 
-docker_image: "{{ registry }}/{{ title }}:{{ tag }}"
+# image tag: deploy.sh passes -e image_tag=<commit>; "tag" is the fallback
+# when running the playbook by hand — rollback = -e image_tag=<older-commit>
+docker_image: "{{ registry }}/{{ title }}:{{ image_tag | default(tag) }}"
 docker_container: "{{ title }}-staging"
 docker_port: 3000
 

deploy.sh

@@ -1,14 +1,51 @@
 #!/usr/bin/env bash
+# Mozimo deploy — build the exact commit at origin/main, tag it with its
+# commit id, and hand that tag to ansible. Guards make it impossible to
+# deploy anything other than what git knows about.
+#
+#   ./deploy.sh           deploy HEAD (must be pushed, tree must be clean)
+#   ./deploy.sh --prune   also drop old mozimo images on the server (keep 3)
+#   ./deploy.sh --force   skip the guards (know what you are doing)
 set -euo pipefail
-parent_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" || exit ; pwd -P )
-cd "$parent_path" || exit
-git pull
-if [ 1 -eq "$#" ]
-then
-  make build-production TAG="$1"
-else
-  make build-production
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+FORCE=false
+PRUNE=false
+for arg in "$@"; do
+	case "$arg" in
+	--force) FORCE=true ;;
+	--prune) PRUNE=true ;;
+	*)
+		echo "Usage: $0 [--force] [--prune]"
+		exit 1
+		;;
+	esac
+done
+
+# guards: only tracked-file state matters (untracked files never enter a
+# `git archive HEAD` build); HEAD must equal origin/main
+if [ "$FORCE" != true ]; then
+	if [ -n "$(git status --porcelain --untracked-files=no)" ]; then
+		echo "✗ tracked files modified — commit or stash first (or --force)" >&2
+		exit 1
+	fi
+	git fetch origin --quiet
+	if [ "$(git rev-parse HEAD)" != "$(git rev-parse origin/main)" ]; then
+		echo "✗ HEAD != origin/main — push or pull first (or --force)" >&2
+		exit 1
+	fi
 fi
 
-cd "$parent_path/ansible" || exit
-ansible-playbook playbook.yml
+git pull --ff-only
+TAG=$(git rev-parse --short HEAD)
+echo "▶ deploying commit $TAG"
+make build-production TAG="$TAG"
+
+PRUNE_FLAG=""
+if [ "$PRUNE" = true ]; then
+	PRUNE_FLAG="-e mozimo_image_prune=true"
+fi
+
+cd ansible
+# shellcheck disable=SC2086
+ansible-playbook playbook.yml -e "image_tag=$TAG" $PRUNE_FLAG