Generic host/repo/branch-aware CD on adnanh/webhook
Replaces the per-project deploy scripts and self-contained webhook receivers with one manifest-driven implementation that lives outside the application repositories and can be updated independently of them. First targets: domaindingo test and prod on s5.
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fisher
Executable
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#!/usr/bin/env bash
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#
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# Generic, host/repo/branch-aware deployment.
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#
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# One script for every project and every environment in the fleet. It is driven
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# entirely by targets.json, so onboarding a new environment never means writing
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# another copy of this logic inside a project repository.
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#
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# Invoked by the webhook daemon as:
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# cd-deploy --repo OWNER/NAME --ref refs/heads/BRANCH --sha FULLSHA [--event push]
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#
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# Deliberate properties, each one a lesson from the scripts this replaces:
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#
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# * It never touches git. The compose stacks live in uas-ng and are refreshed
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# by that repo's own updater timer. A deploy script that runs `git reset
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# --hard` owns two jobs badly instead of one job well.
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# * It deploys the immutable <branch>-sha-<short> tag, then re-pins to the
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# resolved digest. Mutable tags like :latest and :test have already drifted
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# once in this fleet and served a broken build.
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# * It verifies the image's org.opencontainers.image.revision label equals the
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# commit that triggered the deploy, before changing anything.
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# * It never runs `docker compose down`, and most emphatically never
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# `down -v` -- `up -d` recreates exactly the services whose image changed.
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# * A target belonging to another host is a clean no-op, logged as such, and
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# never reported as a success.
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set -Eeuo pipefail
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SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
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readonly SCRIPT_DIR
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readonly CD_TARGET="${SCRIPT_DIR}/cd-target"
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readonly STATE_DIR="${XDG_STATE_HOME:-${HOME}/.local/state}/cd-webhook"
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readonly NO_MATCH=3
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REPO=""
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REF=""
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SHA=""
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EVENT="push"
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DRY_RUN=0
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# ---------------------------------------------------------------- logging ---
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log() { printf '%s %s\n' "$(date -u '+%Y-%m-%dT%H:%M:%SZ')" "$*"; }
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warn() { log "WARN $*" >&2; }
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die() { log "ERROR $*" >&2; exit 1; }
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usage() {
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sed -n '3,30p' "${BASH_SOURCE[0]}" | sed 's/^# \{0,1\}//'
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exit "${1:-0}"
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}
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# ------------------------------------------------------------ arg parsing ---
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--repo) REPO="${2:?--repo needs a value}"; shift 2 ;;
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--ref) REF="${2:?--ref needs a value}"; shift 2 ;;
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--sha) SHA="${2:?--sha needs a value}"; shift 2 ;;
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--event) EVENT="${2:?--event needs a value}"; shift 2 ;;
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--dry-run) DRY_RUN=1; shift ;;
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-h|--help) usage 0 ;;
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*) die "unknown argument: $1 (try --help)" ;;
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esac
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done
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[[ -n "$REPO" ]] || die "--repo is required"
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[[ -n "$REF" ]] || die "--ref is required"
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[[ -n "$SHA" ]] || die "--sha is required"
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if [[ "$EVENT" != "push" ]]; then
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log "ignoring event '${EVENT}' for ${REPO} (only 'push' deploys)"
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exit 0
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fi
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if [[ "$REF" != refs/heads/* ]]; then
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log "ignoring non-branch ref '${REF}' for ${REPO} (tags and deletes never deploy)"
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exit 0
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fi
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BRANCH="${REF#refs/heads/}"
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if [[ ! "$SHA" =~ ^[0-9a-f]{40}$ ]]; then
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die "--sha must be a full 40-character hex commit, got: ${SHA}"
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fi
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# The all-zero SHA is how git spells "this ref was deleted".
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if [[ "$SHA" == "0000000000000000000000000000000000000000" ]]; then
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log "ignoring branch deletion of ${REPO}@${BRANCH}"
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exit 0
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fi
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# ------------------------------------------------------ target resolution ---
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set +e
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resolved="$("$CD_TARGET" resolve --repo "$REPO" --branch "$BRANCH")"
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resolve_rc=$?
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set -e
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if [[ $resolve_rc -eq $NO_MATCH ]]; then
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log "no target on $(hostname) for ${REPO}@${BRANCH} -- nothing to do here"
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exit 0
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elif [[ $resolve_rc -ne 0 ]]; then
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die "target lookup failed for ${REPO}@${BRANCH} (exit ${resolve_rc})"
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fi
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eval "$resolved"
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mkdir -p "$STATE_DIR"
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readonly LOG_FILE="${STATE_DIR}/${CD_NAME}.log"
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exec > >(stdbuf -oL tee -a "$LOG_FILE") 2>&1
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log "=============================================================="
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log "target ${CD_NAME} (${CD_ENV} on ${CD_RESOLVED_HOST})"
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log "repo ${REPO}@${BRANCH}"
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log "commit ${SHA}"
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log "stack ${CD_STACK_DIR}/${CD_COMPOSE_FILE} [project ${CD_COMPOSE_PROJECT}]"
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[[ $DRY_RUN -eq 1 ]] && log "mode DRY RUN -- nothing will be changed"
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[[ -d "$CD_STACK_DIR" ]] || die "stack directory missing: ${CD_STACK_DIR}"
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[[ -f "${CD_STACK_DIR}/${CD_COMPOSE_FILE}" ]] \
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|| die "compose file missing: ${CD_STACK_DIR}/${CD_COMPOSE_FILE}"
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# ----------------------------------------------------------------- notify ---
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notify() {
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local status="$1" message="$2" icon topic
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case "$status" in
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ok) icon="✅" ;;
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fail) icon="❌" ;;
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*) icon="ℹ️" ;;
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esac
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topic="${REPO//\//-}"
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curl -fsS --max-time 10 \
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-H "Title: ${CD_NAME} deploy" \
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-d "${icon} ${CD_NAME} (${CD_ENV}): ${message}" \
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"${CD_NTFY_BASE_URL}/${topic}" >/dev/null 2>&1 \
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|| warn "ntfy notification failed (deploy outcome itself is unaffected)"
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}
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# ------------------------------------------------------------------- lock ---
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# Serialise per target, not per host: a test deploy must not block a prod one.
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readonly LOCK_FILE="${STATE_DIR}/${CD_NAME}.lock"
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exec 9>"$LOCK_FILE"
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log "waiting for deploy lock (${CD_LOCK_WAIT_SECONDS}s max)"
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if ! flock -w "$CD_LOCK_WAIT_SECONDS" 9; then
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notify fail "timed out waiting for the deploy lock after ${CD_LOCK_WAIT_SECONDS}s"
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die "timed out waiting for deploy lock after ${CD_LOCK_WAIT_SECONDS}s"
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fi
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log "lock acquired"
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# -------------------------------------------------------------- image tag ---
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tag="$CD_IMAGE_TAG_TEMPLATE"
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tag="${tag//\{branch\}/$BRANCH}"
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tag="${tag//\{env\}/$CD_ENV}"
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tag="${tag//\{sha\}/$SHA}"
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tag="${tag//\{short7\}/${SHA:0:7}}"
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tag="${tag//\{short12\}/${SHA:0:12}}"
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readonly CANDIDATE="${CD_IMAGE_REPO}:${tag}"
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log "candidate ${CANDIDATE}"
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# ------------------------------------------------------- wait for the image --
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# The push webhook fires the moment the commit lands, which is well before CI
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# has finished building. Poll rather than fail: the running container keeps
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# serving throughout.
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wait_for_image() {
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local elapsed=0
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while true; do
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if docker pull "$CANDIDATE" >/dev/null 2>&1; then
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log "image available after ${elapsed}s"
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return 0
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fi
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if (( elapsed >= CD_IMAGE_WAIT_SECONDS )); then
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return 1
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fi
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log "image not published yet, retrying in ${CD_IMAGE_POLL_INTERVAL}s (${elapsed}s elapsed)"
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sleep "$CD_IMAGE_POLL_INTERVAL"
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elapsed=$(( elapsed + CD_IMAGE_POLL_INTERVAL ))
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done
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}
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log "waiting for CI to publish the image (up to ${CD_IMAGE_WAIT_SECONDS}s)"
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if [[ $DRY_RUN -eq 1 ]]; then
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log "dry run: skipping image wait"
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elif ! wait_for_image; then
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notify fail "image ${CANDIDATE} never appeared (waited ${CD_IMAGE_WAIT_SECONDS}s) -- did CI fail?"
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die "image ${CANDIDATE} did not appear within ${CD_IMAGE_WAIT_SECONDS}s"
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fi
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# --------------------------------------------------- verify and pin digest ---
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image_digest_ref() {
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docker image inspect --format '{{range .RepoDigests}}{{println .}}{{end}}' "$1" 2>/dev/null \
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| grep "^${CD_IMAGE_REPO}@" | head -n1
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}
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if [[ $DRY_RUN -eq 1 ]]; then
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DEPLOY_IMAGE="$CANDIDATE"
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log "dry run: would deploy ${DEPLOY_IMAGE}"
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else
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revision="$(docker image inspect \
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--format '{{index .Config.Labels "org.opencontainers.image.revision"}}' \
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"$CANDIDATE" 2>/dev/null || true)"
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if [[ -z "$revision" || "$revision" == "<no value>" ]]; then
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warn "image carries no org.opencontainers.image.revision label; cannot prove provenance"
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elif [[ "$revision" != "$SHA" ]]; then
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notify fail "image ${CANDIDATE} is built from ${revision:0:12}, not ${SHA:0:12} -- refusing to deploy"
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die "provenance mismatch: ${CANDIDATE} declares revision ${revision}, expected ${SHA}"
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else
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log "provenance revision label matches ${SHA:0:12}"
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fi
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DEPLOY_IMAGE="$(image_digest_ref "$CANDIDATE")"
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if [[ -z "$DEPLOY_IMAGE" ]]; then
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warn "could not resolve a digest for ${CANDIDATE}; deploying by tag instead"
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DEPLOY_IMAGE="$CANDIDATE"
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else
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log "pinned ${DEPLOY_IMAGE}"
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fi
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fi
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readonly DEPLOY_IMAGE
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# --------------------------------------------- remember what is running now ---
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PREVIOUS_IMAGE="$(
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container_image="$(docker inspect --format '{{.Image}}' "$CD_CONTAINER" 2>/dev/null || true)"
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[[ -n "$container_image" ]] && image_digest_ref "$container_image" || true
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)"
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readonly PREVIOUS_IMAGE
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if [[ -n "$PREVIOUS_IMAGE" ]]; then
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log "current ${PREVIOUS_IMAGE}"
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else
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log "current (nothing running -- first deploy, or container absent)"
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fi
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# ----------------------------------------------------------------- deploy ---
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compose_up() {
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local image="$1"
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# `up -d` recreates only what actually changed. `down` is deliberately not
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# used here: it causes avoidable downtime, and `down -v` would destroy the
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# data volumes these stacks depend on.
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( cd "$CD_STACK_DIR" \
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&& env "${CD_IMAGE_ENV_VAR}=${image}" \
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"${CD_PULL_POLICY_ENV_VAR}=missing" \
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timeout "$CD_COMPOSE_TIMEOUT_SECONDS" \
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docker compose -f "$CD_COMPOSE_FILE" -p "$CD_COMPOSE_PROJECT" up -d --no-build )
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}
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check_health() {
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local attempt=1 body
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while (( attempt <= CD_HEALTH_RETRIES )); do
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body="$(curl -fsS --max-time 5 "$CD_HEALTH_URL" 2>/dev/null || true)"
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if [[ -n "$body" ]]; then
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if python3 -c '
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import json, sys
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key, want = sys.argv[1], sys.argv[2]
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try:
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data = json.loads(sys.stdin.read())
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except Exception:
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sys.exit(1)
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sys.exit(0 if str(data.get(key, "")).lower() == want.lower() else 1)
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' "$CD_HEALTH_EXPECT_KEY" "$CD_HEALTH_EXPECT_VALUE" <<<"$body"; then
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log "health ok after ${attempt} attempt(s): ${body}"
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return 0
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fi
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fi
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log "health not ready (attempt ${attempt}/${CD_HEALTH_RETRIES}), retrying in ${CD_HEALTH_INTERVAL}s"
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sleep "$CD_HEALTH_INTERVAL"
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(( attempt++ ))
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done
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warn "health check never passed: last response was '${body:-<no response>}'"
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return 1
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}
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if [[ $DRY_RUN -eq 1 ]]; then
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log "dry run: would run docker compose up -d with ${CD_IMAGE_ENV_VAR}=${DEPLOY_IMAGE}"
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log "dry run: would health-check ${CD_HEALTH_URL}"
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log "dry run complete -- no changes made"
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exit 0
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fi
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log "deploying ${DEPLOY_IMAGE}"
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if ! compose_up "$DEPLOY_IMAGE"; then
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notify fail "docker compose up failed for ${SHA:0:12} -- stack left as-is"
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die "docker compose up failed"
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fi
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if check_health; then
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log "=== deploy succeeded: ${CD_NAME} now runs ${SHA:0:12} ==="
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notify ok "deployed ${SHA:0:12} (${DEPLOY_IMAGE##*@})"
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exit 0
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fi
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# ---------------------------------------------------------------- rollback ---
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if [[ "$CD_ROLLBACK_ON_FAILURE" != "True" && "$CD_ROLLBACK_ON_FAILURE" != "true" ]]; then
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notify fail "health check failed for ${SHA:0:12}; rollback disabled, stack left on the new image"
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die "health check failed and rollback is disabled for this target"
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fi
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if [[ -z "$PREVIOUS_IMAGE" ]]; then
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notify fail "health check failed for ${SHA:0:12} and there is no previous image to roll back to"
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die "health check failed; no previous image recorded, leaving the stack as it is"
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fi
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warn "health check failed -- rolling back to ${PREVIOUS_IMAGE}"
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if compose_up "$PREVIOUS_IMAGE" && check_health; then
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notify fail "deploy of ${SHA:0:12} failed health check; rolled back to the previous image successfully"
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die "deploy failed health check; rolled back to ${PREVIOUS_IMAGE}"
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fi
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notify fail "deploy of ${SHA:0:12} failed AND rollback failed -- ${CD_NAME} needs manual attention now"
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die "deploy failed and rollback also failed; manual intervention required"
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