package_check/sub_scripts/lxc.sh

# #!/bin/bash

#=================================================
# Globals variables
#=================================================

# -q aims to disable the display of 'Debian GNU/Linux' each time a command is ran
arg_ssh="-tt -q"

#=================================================
# RUNNING SNAPSHOT
#=================================================

LXC_CREATE () {
    lxc launch $LXC_NAME-base $LXC_NAME || exit 1
    lxc config set "$LXC_NAME" security.nesting true
    _LXC_START_AND_WAIT $LXC_NAME
    CREATE_LXC_SNAPSHOT snap0
}

LXC_SNAPSHOT_EXISTS() {
    lxc info $LXC_NAME | grep -A10 Snapshots | tail -n -1 | awk '{print $1}' | greq -q -w "$1"
}

CREATE_LXC_SNAPSHOT () {
    # Create a temporary snapshot

    local snapname=$1

    start_timer

    # Check all the witness files, to verify if them still here
    [ $snapname != "snap0" ] && check_witness_files >&2

    # Remove swap files to avoid killing the CI with huge snapshots.
    sudo lxc exec $LXC_NAME -- bash -c 'for swapfile in $(ls /swap_*); do swapoff $swapfile; done'
    sudo lxc exec $LXC_NAME -- bash -c 'for swapfile in $(ls /swap_*); do rm -f $swapfile; done'
    
    # Stop the container, before its snapshot
    sudo lxc stop --timeout 15 $LXC_NAME 2>/dev/null

    # Check if the snapshot already exist
    if ! LXC_SNAPSHOT_EXISTS "$snapname"
    then
        log_debug "$snapname doesn't exist, its first creation can takes a little while." >&2
        sudo lxc snapshot $LXC_NAME $snapname --stateful
    fi
    
    stop_timer 1
}

LOAD_LXC_SNAPSHOT () {
    snapname=$1
    sudo lxc stop --timeout 15 $LXC_NAME 2>/dev/null
    sudo lxc restore $LXC_NAME $snapname --stateful
    _LXC_START_AND_WAIT $LXC_NAME
}

#=================================================

LXC_START () {
    # Start the lxc container and execute the given command in it
    local cmd=$1

    sudo lxc start $LXC_NAME
    _LXC_START_AND_WAIT $LXC_NAME

    start_timer

    # Copy the package into the container.
    lxc exec $LXC_NAME -- rm -rf /app_folder
    lxc file push -r "$package_path" $LXC_NAME/app_folder

    # Execute the command given in argument in the container and log its results.
    lxc exec $LXC_NAME -- $cmd | tee -a "$complete_log"

    # Store the return code of the command
    local returncode=${PIPESTATUS[0]}

    log_debug "Return code: $return_code"

    stop_timer 1
    # Return the exit code of the ssh command
    return $returncode
}

LXC_STOP () {
    sudo lxc stop --timeout 15 $LXC_NAME 2>/dev/null
}

LXC_RESET () {
    sudo lxc stop --timeout 15 $LXC_NAME 2>/dev/null
    sudo lxc delete $LXC_NAME 
}


_LXC_START_AND_WAIT() {

	restart_container()
	{
		lxc stop "$1"
		lxc start "$1"
	}

	# Try to start the container 3 times.
	local max_try=3
	local i=0
	while [ $i -lt $max_try ]
	do
		i=$(( i +1 ))
		local failstart=0

		# Wait for container to start, we are using systemd to check this,
		# for the sake of brevity.
		for j in $(seq 1 10); do
			if lxc exec "$1" -- /bin/bash -c "systemctl isolate multi-user.target" >/dev/null 2>/dev/null; then
				break
			fi

			if [ "$j" == "10" ]; then
				error 'Failed to start the container'
				failstart=1

				restart_container "$1"
			fi

			sleep 1s
		done

		# Wait for container to access the internet
		for j in $(seq 1 10); do
			if lxc exec "$1" -- /bin/bash -c "! which wget > /dev/null 2>&1 || wget -q --spider http://github.com"; then
				break
			fi

			if [ "$j" == "10" ]; then
				error 'Failed to access the internet'
				failstart=1

				restart_container "$1"
			fi

			sleep 1s
		done

		# Has started and has access to the internet
		if [ $failstart -eq 0 ]
		then
			break
		fi

		# Fail if the container failed to start
		if [ $i -eq $max_try ] && [ $failstart -eq 1 ]
		then
			return 1
		fi
	done

    LXC_IP=$(lxc exec $1 -- hostname -I | grep -E -o "\<[0-9.]{8,}\>")
}