#!/bin/bash

#=================================================
# GENERIC START
#=================================================
# IMPORT GENERIC HELPERS
#=================================================

source _common.sh
source /usr/share/yunohost/helpers

#=================================================
# MANAGE SCRIPT FAILURE
#=================================================

# Exit if an error occurs during the execution of the script
ynh_abort_if_errors

#=================================================
# RETRIEVE ARGUMENTS FROM THE MANIFEST
#=================================================

export app=$YNH_APP_INSTANCE_NAME

# Retrieve arguments
ynh_export ssh_user public_key quota datadir alert_delay alert_mails

#=================================================
# CHECK IF THE APP CAN BE INSTALLED WITH THIS ARGS
#=================================================
# Here is a small hack to avoid multi install CI test to fail due 
# to same ssh_user provided
if [[ "${PACKAGE_CHECK_EXEC:-}" = "1" ]] ; then
    ssh_user+="$YNH_APP_INSTANCE_NUMBER"
fi
ynh_system_user_exists --username=$ssh_user && ynh_die --message="This user already exists"

datadir=$(echo "$datadir" | sed "s/__SSH_USER__/$ssh_user/" | sed "s/__APP__/$app/")
if [[ -z "$datadir" ]]; then
    datadir=/home/$ssh_user
fi

if _acceptable_path_to_delete "$datadir"; then
    ynh_die --message="This path can't be used as home dir for the ssh_user"
fi


#=================================================
# STORE SETTINGS FROM MANIFEST
#=================================================

ynh_save_args ssh_user public_key quota alert_delay alert_mails datadir

#=================================================
# INSTALL DEPENDENCIES
#=================================================
ynh_script_progression --message="Installing dependencies..."

ynh_install_app_dependencies $pkg_dependencies
install_borg_with_pip

#=================================================
# CREATE SSH USER USED BY BORG
#=================================================
ynh_script_progression --message="Creating SSH user used by Borg..."

ynh_system_user_create --username=$ssh_user --home_dir=$datadir --use_shell --groups ssh.app

#=================================================
# AUTORIZE SSH FOR THIS USER
#=================================================
ynh_script_progression --message="Configuring SSH public key for remote connexion..."

mkdir -p $datadir/.ssh
chmod o=--- $datadir
chown -R $ssh_user:$ssh_user $datadir
touch $datadir/.ssh/authorized_keys
extra="--storage-quota $quota"
if [ "$quota" = "" ]; then
    extra=""
fi
echo "command=\"borg serve $extra --restrict-to-repository $datadir/backup\",no-pty,no-agent-forwarding,no-port-forwarding,no-X11-forwarding,no-user-rc $public_key" >> $datadir/.ssh/authorized_keys

#=================================================
# AVOID BACKUP OF BACKUP
#=================================================
ynh_script_progression --message="Avoiding to backup the backup itself..."

touch $datadir/.nobackup

#=================================================
# SETUP CRON
#=================================================
ynh_script_progression --message="Configuring cron to monitor backup..."
ynh_add_config --template="monitor-backup" --destination="/etc/cron.d/$app"

#=================================================
# END OF SCRIPT
#=================================================

ynh_script_progression --message="Installation of $app completed" --last