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

# Only start if PostgreSQL has been configured
ConditionPathExists=/etc/quadlets/postgresql/config.env
# and initialized
ConditionPathExists=/var/lib/quadlets/postgresql/.initialized
# and upgraded
ConditionPathExists=/var/lib/quadlets/postgresql/latest/docker/PG_VERSION

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

[Container]
ContainerName=postgresql-server
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

# Safety flag to avoid initialization of an unwanted database
Environment=DATABASE_ALREADY_EXISTS=true

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

# Volume mounts
Volume=/var/lib/quadlets/postgresql:/var/lib/postgresql:z

# 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

# Health check
HealthCmd=pg_isready -U $POSTGRES_USER -d $POSTGRES_DB -p $PGPORT
HealthInterval=30s
HealthTimeout=10s
HealthStartPeriod=60s
HealthRetries=3

# Share /run/postgresql/ between containers in the pod for the Unix socket
Volume=/run/quadlets/postgresql:/var/run/postgresql:z

[Service]
Restart=always
RestartSec=10
TimeoutStartSec=120
TimeoutStopSec=30

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

[Install]
WantedBy=postgresql.target