run_sync

#!/bin/bash -eu

set +H -xeuo pipefail

: ${RSYNC_UID:=$(stat /mnt/sync/data -c '%u')}
: ${RSYNC_GID:=$(stat /mnt/sync/data -c '%g')}

# Create new group using target GID
if ! odgroup="$(getent group "$RSYNC_GID")"; then
  odgroup='run_sync'
  groupadd "${odgroup}" -g "$RSYNC_GID"
else
  odgroup=${odgroup%%:*}
fi

# Create new user using target UID
if ! oduser="$(getent passwd "$RSYNC_UID")"; then
  oduser='run_sync'
  useradd -m "${oduser}" -u "$RSYNC_UID" -g "$RSYNC_GID"
else
  oduser="${oduser%%:*}"
  usermod -g "${odgroup}" "${oduser}"
  grep -qv root <( groups "${oduser}" ) || { echo 'ROOT level privileges prohibited!'; exit 1; }
fi

chown -R "${oduser}:${odgroup}" /mnt/sync

mkdir -p /mnt/sync/folders
mkdir -p /mnt/sync/config

if ! [ -f /mnt/sync/sync.conf ]; then
    cp /etc/sync.conf.default /mnt/sync/sync.conf;
fi

HOME=/mnt/sync/folders exec gosu "${oduser}" /usr/bin/rslsync --nodaemon $*