refactor(demo): run native demo without Docker #4708
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| #!/usr/bin/env bash | ||
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imabdulbasit marked this conversation as resolved.
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| # | ||
| # Start a single native PostgreSQL instance for the process-compose demo. | ||
| # | ||
| # The caller provides a port and a data directory; this script initializes | ||
| # the cluster, starts postgres bound to 127.0.0.1, creates the "espresso" | ||
| # database, and then blocks in the foreground so process-compose can manage | ||
| # it as one long-lived service. SIGTERM/SIGINT are forwarded to postgres so | ||
| # process-compose can stop it cleanly. The data directory is expected to | ||
| # live under a caller-managed temp path; it is not created or removed here. | ||
| # | ||
| set -euo pipefail | ||
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| readonly SCRIPT_NAME="${0##*/}" | ||
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| usage() { | ||
| cat <<EOF | ||
| Usage: ${SCRIPT_NAME} PORT DATADIR | ||
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| Start a native postgres instance bound to 127.0.0.1:PORT, storing data | ||
| and the unix socket under DATADIR, with a "root" superuser (trust auth) | ||
| and an "espresso" database. | ||
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| ARGUMENTS: | ||
| PORT TCP port for postgres to listen on | ||
| DATADIR Existing empty data directory to initialize and use | ||
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| OPTIONS: | ||
| -h, --help Show this help | ||
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Contributor
There was a problem hiding this comment. Minor doc nit: the usage says |
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| EOF | ||
| } | ||
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| err() { | ||
| echo "[${SCRIPT_NAME}] $*" >&2 | ||
| } | ||
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| main() { | ||
| if [[ "${1:-}" == "-h" || "${1:-}" == "--help" ]]; then | ||
| usage | ||
| exit 0 | ||
| fi | ||
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| if [[ $# -ne 2 ]]; then | ||
| err "Expected 2 arguments, got $#" | ||
| usage >&2 | ||
| exit 1 | ||
| fi | ||
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| local port="$1" | ||
| local datadir="$2" | ||
| local pg_pid | ||
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| initdb -D "${datadir}" -U root --auth=trust >/dev/null | ||
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| postgres -D "${datadir}" -p "${port}" -k "${datadir}" -h 127.0.0.1 & | ||
| pg_pid=$! | ||
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| # SIGINT triggers postgres "fast shutdown" (rolls back and disconnects clients | ||
| # immediately). SIGTERM would be a "smart shutdown" that blocks until every client | ||
| # disconnects, hanging until process-compose force-kills on teardown. | ||
| trap 'kill -INT "${pg_pid}" 2>/dev/null' TERM INT | ||
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| until pg_isready -h 127.0.0.1 -p "${port}" >/dev/null 2>&1; do | ||
| sleep 0.5 | ||
| done | ||
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| createdb -h 127.0.0.1 -p "${port}" -U root espresso | ||
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| # Double wait: the first returns as soon as the trap fires; the second blocks until | ||
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Contributor
There was a problem hiding this comment. Startup-time shutdown can hang this script. The This is a narrow window (only during startup, before the DB is ready), so it's minor, but you can make shutdown deterministic by breaking out when a shutdown was requested, e.g. set a flag in the trap and check it: shutting_down=0
trap 'shutting_down=1; kill -INT "${pg_pid}" 2>/dev/null' TERM INT
until pg_isready -h 127.0.0.1 -p "${port}" >/dev/null 2>&1; do
[[ "${shutting_down}" -eq 1 ]] && break
sleep 0.5
done |
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| # postgres has actually exited so it is never left orphaned (see scripts/demo-native). | ||
| wait "${pg_pid}" || true | ||
| wait "${pg_pid}" 2>/dev/null || true | ||
| } | ||
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| main "$@" | ||
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