[Unit]
Description=PostgreSQL Database Server - Initialization
Documentation=https://hub.docker.com/_/postgres/
After=network.target postgresql-set-major.service
Before=postgresql-server.service
Requires=postgresql-set-major.service

# Only start if PostgreSQL has been configured
ConditionPathExists=/etc/quadlets/postgresql/config.env
# and NOT initialized
ConditionPathExists=!/var/lib/quadlets/postgresql/.initialized

# Start/stop this unit when the target is started/stopped
PartOf=postgresql.target

[Container]
ContainerName=postgresql-init-job
Image=docker.io/library/postgres:${PG_MAJOR}-alpine

# Network configuration
Network=host

# PostgreSQL storage is specific to major version
Environment=PGDATA=/var/lib/postgresql/${PG_MAJOR}/docker

# Those environment variables will be injected by podman into the container
EnvironmentFile=/etc/quadlets/postgresql/config.env

# Use our entrypoint script to initialize the database
Entrypoint=/usr/local/bin/init.sh

# Set PostgreSQL command line arguments
Exec=${POSTGRES_ARGS}

# No need for root privileges
User=postgres
Group=postgres

# UID/GID mapping to map the postgres (70) user inside the container to arbitrary user 10004 / group 10000 on the host
UIDMap=0:1000000:65535
UIDMap=+70:10004:1
GIDMap=0:1000000:65535
GIDMap=+70:10000:1

# Avoid issues with built-in volumes being created by root
PodmanArgs=--image-volume=ignore

# Volume mounts
Volume=/var/lib/quadlets/postgresql:/var/lib/postgresql:z
Volume=/var/lib/virtiofs/data/postgresql/backup:/var/lib/postgresql/backup:z
Volume=/etc/quadlets/postgresql/init.sh:/usr/local/bin/init.sh:z,ro
Volume=/etc/quadlets/postgresql/init.d:/docker-entrypoint-initdb.d:z,ro

[Service]
Restart=no
TimeoutStartSec=30

# These environment variables are sourced to be used by systemd in the Exec* commands
EnvironmentFile=/etc/quadlets/postgresql/config.env

# This container is a job - run once to completion
Type=oneshot

# Mark the database as intialized
ExecStartPost=touch /var/lib/quadlets/postgresql/.initialized

[Install]
WantedBy=postgresql.target