#!/bin/sh
# Runs Canon as PUID:PGID (default 1000:1000) so files it creates on mounted
# folders belong to that user, e.g. 99:100 (nobody:users) on Unraid.
set -eu

PUID="${PUID:-1000}"
PGID="${PGID:-1000}"
UMASK="${UMASK:-022}"

case "$PUID$PGID" in
  *[!0-9]*) echo "canon: PUID and PGID must be numbers (got PUID=$PUID PGID=$PGID)" >&2; exit 1 ;;
esac
case "$UMASK" in
  *[!0-7]*) echo "canon: UMASK must be octal, like 022 or 002 (got $UMASK)" >&2; exit 1 ;;
esac
umask "$UMASK"

# Started with `user:` set in Compose or `--user`: nothing to switch.
if [ "$(id -u)" != 0 ]; then
  exec canon "$@"
fi

data="${CANON_DATA_DIR:-/data}"
backups="${CANON_BACKUP_DIR:-$data/backups}"
for dir in "$data" "$backups"; do
  mkdir -p "$dir"
  # Only touch what's owned by someone else, so restarts stay fast.
  if ! find "$dir" \( ! -user "$PUID" -o ! -group "$PGID" \) -exec chown "$PUID:$PGID" {} + 2>/dev/null; then
    echo "canon: couldn't give $PUID:$PGID ownership of everything in $dir (a network share?); continuing" >&2
  fi
done

export HOME="$data"
exec su-exec "$PUID:$PGID" canon "$@"