lnd.xprv/docker/lnd/start-lnd.sh
Antonin Hildebrand 132c67d414 docker: replace bash shells with last command
It is better to replace bash shell with potentially long-running
last script command. This way the running command will receive all
potential unix process signals directly.

A concrete example which motivated this change:
Exec of btcd is needed for graceful shutdown of btcd during
`docker-compose down`. Docker Compose properly sends this signal to our
start-btcd.sh bash shell but it is not further signalled to the running
btcd process. Docker Compose then kills whole container forcefully after
some timeout.

An alternative solution would be to trap SIGTERM in our bash script and
forward it to running btcd. Which would be IMO ugly and error prone.
2018-04-05 18:17:46 -07:00

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#!/usr/bin/env bash
# exit from script if error was raised.
set -e
# error function is used within a bash function in order to send the error
# message directly to the stderr output and exit.
error() {
echo "$1" > /dev/stderr
exit 0
}
# return is used within bash function in order to return the value.
return() {
echo "$1"
}
# set_default function gives the ability to move the setting of default
# env variable from docker file to the script thereby giving the ability to the
# user override it durin container start.
set_default() {
# docker initialized env variables with blank string and we can't just
# use -z flag as usually.
BLANK_STRING='""'
VARIABLE="$1"
DEFAULT="$2"
if [[ -z "$VARIABLE" || "$VARIABLE" == "$BLANK_STRING" ]]; then
if [ -z "$DEFAULT" ]; then
error "You should specify default variable"
else
VARIABLE="$DEFAULT"
fi
fi
return "$VARIABLE"
}
# Set default variables if needed.
RPCUSER=$(set_default "$RPCUSER" "devuser")
RPCPASS=$(set_default "$RPCPASS" "devpass")
DEBUG=$(set_default "$DEBUG" "debug")
NETWORK=$(set_default "$NETWORK" "simnet")
CHAIN=$(set_default "$CHAIN" "bitcoin")
BACKEND="btcd"
if [[ "$CHAIN" == "litecoin" ]]; then
BACKEND="ltcd"
fi
exec lnd \
--noencryptwallet \
--logdir="/data" \
"--$CHAIN.active" \
"--$CHAIN.$NETWORK" \
"--$CHAIN.node"="btcd" \
"--$BACKEND.rpccert"="/rpc/rpc.cert" \
"--$BACKEND.rpchost"="blockchain" \
"--$BACKEND.rpcuser"="$RPCUSER" \
"--$BACKEND.rpcpass"="$RPCPASS" \
--debuglevel="$DEBUG" \
"$@"