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platypush/bin/platyvenv

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#!/bin/bash
##############################################################################
# This script allows you to easily manage Platypush instances through Python #
# virtual environment. You can build environments from a config.yaml file #
# and automatically managed the required dependencies, as well as start, #
# stop and remove them #
# #
# @author: Fabio Manganiello <fabio@platypush.tech> #
# @licence: MIT #
##############################################################################
workdir="$HOME/.local/share/platypush/venv"
function build {
cfgfile=
while getopts ':c:' opt; do
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case ${opt} in
c)
cfgfile=$OPTARG;;
\?)
echo "Invalid option: -$OPTARG" >&2
exit 1;;
:)
echo "Option -$OPTARG requires the path to a Platypush configuration file" >&2
exit 1;;
esac
done
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if [[ -z "$cfgfile" ]]; then
echo "Usage: $0 build -c <path-to-platypush-config-file>" >&2
exit 1
fi
echo "Parsing configuration file"
pip_cmd=
pkg_cmd=
includes=()
cmd_exec=()
while read -r line; do
if echo "$line" | grep -E "^pip:\s*"; then
pip_cmd="$(echo "$line" | sed -r -e 's/^pip:\s*(.*)'/\\1/)"
elif echo "$line" | grep -E "^packages:\s*"; then
pkg_cmd="$(echo "$line" | sed -r -e 's/^packages:\s*(.*)'/\\1/)"
elif echo "$line" | grep -E "^exec:\s*"; then
cmd_exec+=("$(echo "$line" | sed -r -e 's/^exec:\s*(.*)'/\\1/)")
elif echo "$line" | grep -E "^include:\s*"; then
includes+=("$(echo "$line" | sed -r -e 's/^include:\s*(.*)'/\\1/)")
elif echo "$line" | grep -E "^device_id:\s*"; then
device_id="$(echo "$line" | sed -r -e 's/^device_id:\s*(.*)'/\\1/)"
fi
done <<< "$(python <<EOF
from platypush.config import Config
from platypush.utils.manifest import get_install_commands_from_conf
deps = get_install_commands_from_conf('$(realpath "${cfgfile}")')
print(f'device_id: {Config.get("device_id")}')
if deps.get('pip'):
print(f'pip: {deps["pip"]}')
if deps.get('packages'):
print(f'packages: {deps["packages"]}')
for cmd in deps.get('exec', []):
print(f'exec: {cmd}')
for include in Config._included_files:
print(f'include: {include}')
EOF
)"
envdir="${workdir}/${device_id}"
etcdir="${envdir}/etc/platypush"
echo "Preparing virtual environment for device $device_id"
mkdir -p "$envdir"
mkdir -p "$etcdir"
srcdir=$(dirname "$cfgfile")
for ((i=0; i < ${#includes[@]}; i++)); do
incdir=$(dirname "${includes[$i]}")
incdir=$(realpath --relative-to="$srcdir" "$incdir")
destdir="$etcdir/$incdir"
mkdir -p "$destdir"
cp "${includes[$i]}" "$destdir"
done
cp "$cfgfile" "$etcdir/config.yaml"
cfgfile="${etcdir}/config.yaml"
python3 -m venv "${envdir}"
cd "${envdir}" || exit 1
source "${envdir}/bin/activate"
echo "Installing required dependencies"
# shellcheck disable=SC2086
[ -n "${pkg_cmd}" ] && sudo ${pkg_cmd}
[ -n "${pip_cmd}" ] && ${pip_cmd}
for ((i=0; i < ${#cmd_exec[@]}; i++)); do
${cmd_exec[$i]}
done
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pip install --upgrade git+https://git.platypush.tech/platypush/platypush.git
echo "Platypush virtual environment prepared under $envdir"
}
function start {
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if [[ -z "$1" ]]; then
echo "Usage: $0 start <env-name>" >&2
exit 1
fi
env=$1
envdir="${workdir}/${env}"
rundir="${envdir}/var/run"
pidfile="${rundir}/platypush.pid"
cfgfile="${envdir}/etc/platypush/config.yaml"
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if [[ ! -d "$envdir" ]]; then
echo "No such directory: $envdir" >&2
exit 1
fi
mkdir -p "${rundir}"
if [[ -f "$pidfile" ]]; then
if pgrep -F "${pidfile}"; then
echo "Another instance (PID $(cat "${pidfile}")) is running, please stop that instance first"
exit 1
fi
echo "A PID file was found but the process does not seem to be running, starting anyway"
rm -f "$pidfile"
fi
python3 -m venv "${envdir}"
cd "${envdir}" || exit 1
source bin/activate
bin/platypush -c "$cfgfile" -P "$pidfile" &
start_time=$(date +'%s')
timeout=30
while :; do
[[ -f "$pidfile" ]] && break
now=$(date +'%s')
elapsed=$(( now-start_time ))
if (( elapsed >= timeout )); then
echo "Platypush instance '$env' did not start within $timeout seconds" >&2
exit 1
fi
echo -n '.'
sleep 1
done
pid=$(cat "$pidfile")
echo
echo "Platypush environment $env started with PID $pid"
wait "${pid}"
echo "Platypush environment $env terminated"
}
function stop {
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if [[ -z "$1" ]]; then
echo "Usage: $0 stop <env-name>" >&2
exit 1
fi
env=$1
envdir="${workdir}/${env}"
rundir="${envdir}/var/run"
pidfile="${rundir}/platypush.pid"
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if [[ ! -d "$envdir" ]]; then
echo "No such directory: $envdir" >&2
exit 1
fi
if [[ ! -f "$pidfile" ]]; then
echo "No pidfile found for instance \"${env}\""
exit 1
fi
pid=$(cat "$pidfile")
pids="$pid $(ps --no-headers -o pid= --ppid "$pid")"
# shellcheck disable=SC2086
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kill -9 ${pids}
rm -f "$pidfile"
echo "Instance '$env' with PID $pid stopped"
}
function rme {
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if [[ -z "$1" ]]; then
echo "Usage: $0 rm <env-name>" >&2
exit 1
fi
envdir="${workdir}/$1"
rundir="${envdir}/var/run"
pidfile="${rundir}/platypush.pid"
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if [[ ! -d "$envdir" ]]; then
echo "No such directory: $envdir" >&2
exit 1
fi
if [[ -f "$pidfile" ]]; then
if pgrep -F "${pidfile}"; then
echo "Another instance (PID $(cat "$pidfile")) is running, please stop that instance first"
exit 1
fi
echo "A PID file was found but the process does not seem to be running, removing anyway"
fi
echo "WARNING: This operation will permanently remove the Platypush environment $1"
echo -n "Are you sure you want to continue? (y/N) "
IFS= read -r answer
echo "$answer" | grep -E '^[yY]' >/dev/null || exit 0
rm -rf "$envdir"
echo "$envdir removed"
}
function usage {
echo "Usage: $0 <build|start|stop|rm> [options]" >&2
exit 1
}
if (( $# < 1 )); then
usage
fi
action=$1
shift
mkdir -p "${workdir}"
# shellcheck disable=SC2048,SC2086
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case ${action} in
'build') build $*;;
'start') start $*;;
'stop') stop $*;;
'rm') rme $*;;
*) usage;;
esac