#!/bin/bash

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

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

#=================================================
# LOAD SETTINGS
#=================================================
ynh_script_progression --message="Loading installation settings..."

app=$YNH_APP_INSTANCE_NAME

#=================================================
# ENSURE DOWNWARD COMPATIBILITY
#=================================================
ynh_script_progression --message="Ensuring downward compatibility..."

sed -i "/root:1000000:65536 # Added by lxd#/d" /etc/sub{u,g}id

#=================================================
# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
#=================================================
ynh_script_progression --message="Backing up the app before upgrading (may take a while)..."

# Backup the current version of the app
ynh_backup_before_upgrade
ynh_clean_setup () {
	ynh_exec_warn_less popd

	ynh_secure_remove --file="$go_tmp"
	ynh_secure_remove --file="$lxd_tmp"
	# Restore it if the upgrade fails
	ynh_restore_upgradebackup
}
# Exit if an error occurs during the execution of the script
ynh_abort_if_errors

#=================================================
# STANDARD UPGRADE STEPS
#=================================================
# STOP SYSTEMD SERVICE
#=================================================
ynh_script_progression --message="Stopping a systemd service..."

ynh_systemd_action --service_name="$app.socket" --action="stop"
ynh_systemd_action --service_name=$app --action="stop" --log_path="/var/log/$app/$app.log"

#=================================================
# UPGRADE DEPENDENCIES
#=================================================
ynh_script_progression --message="Upgrading dependencies..."

ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies

#=================================================
# DOWNLOAD, CHECK AND UNPACK SOURCE
#=================================================
ynh_script_progression --message="Setting up source files..."

# Download, check integrity, uncompress and patch the source from app.src
go_tmp=$(mktemp -d)
ynh_setup_source --dest_dir="$go_tmp" --source_id="go.$(ynh_detect_arch)"

export PATH=$go_tmp/bin:$PATH

lxd_tmp=$(mktemp -d)
ynh_setup_source --dest_dir="$lxd_tmp" --source_id="lxd"

export GOPATH=${lxd_tmp}/vendor/

#=================================================
# BUILD FROM SOURCES
#=================================================
ynh_script_progression --message="Building lxd from sources..." --weight=60

pushd ${lxd_tmp}

export HOME=${HOME:-"/root/"}

ynh_exec_warn_less make deps
export CGO_CFLAGS="-I${GOPATH}/raft/include/ -I${GOPATH}/dqlite/include/"
export CGO_LDFLAGS="-L${GOPATH}/raft/.libs -L${GOPATH}/dqlite/.libs/"
export LD_LIBRARY_PATH="${GOPATH}/raft/.libs/:${GOPATH}/dqlite/.libs/"
export CGO_LDFLAGS_ALLOW="(-Wl,-wrap,pthread_create)|(-Wl,-z,now)"

export GOCACHE=$go_tmp

ynh_exec_warn_less make

mkdir -p /usr/local/lib/$app
mkdir -p /var/log/$app
cp -a ${GOPATH}/{raft,dqlite}/.libs/lib*.so* /usr/local/lib/$app/
cp ${GOPATH}/bin/{fuidshift,lxc,lxc-to-lxd,lxd,lxd-agent,lxd-benchmark,lxd-p2c} /usr/local/bin
cp ${lxd_tmp}/scripts/bash/lxd-client /etc/bash_completion.d/
popd

ynh_secure_remove --file="$go_tmp"
ynh_secure_remove --file="$lxd_tmp"

#=================================================
# CREATE DEDICATED USER
#=================================================
ynh_script_progression --message="Making sure dedicated system user exists..."

# Create a dedicated user (if not existing)
ynh_system_user_create --username=$app

#=================================================
# SPECIFIC UPGRADE
#=================================================
# SETUP SYSTEMD
#=================================================
ynh_script_progression --message="Configuring a systemd service..."

# Create a dedicated systemd config
ynh_add_systemd_socket_config
ynh_add_systemd_config

#=================================================
# MODIFY A CONFIG FILE
#=================================================

ynh_backup_if_checksum_is_different --file="/etc/dnsmasq.d/lxd"

echo "bind-interfaces
except-interface=lxdbr0" > /etc/dnsmasq.d/lxd
systemctl restart dnsmasq

ynh_store_file_checksum --file="/etc/dnsmasq.d/lxd"

ynh_backup_if_checksum_is_different --file="/etc/ld.so.conf.d/$app.conf"

echo "/usr/local/lib/$app/" > /etc/ld.so.conf.d/$app.conf

ynh_store_file_checksum --file="/etc/ld.so.conf.d/$app.conf"

ldconfig

echo "# Added by lxd
root:100000:65536" | tee -a /etc/subuid /etc/subgid

#=================================================
# GENERIC FINALIZATION
#=================================================
# INTEGRATE SERVICE IN YUNOHOST
#=================================================
ynh_script_progression --message="Integrating service in YunoHost..."

yunohost service add $app --log="/var/log/$app/$app.log"

#=================================================
# START SYSTEMD SERVICE
#=================================================
ynh_script_progression --message="Starting a systemd service..."

# Start a systemd service
ynh_systemd_action --service_name=$app --action="start" --log_path="/var/log/$app/$app.log"

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

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