#!/bin/bash

# startup script for purely stateless master

# we download the config from an arbitrary curl accessible tar.gz file (which github can generate for us)

export PATH="/buildbot_venv/bin:$PATH"

B=$(pwd)

if [ -z "$BUILDBOT_CONFIG_URL" ]
then
    if [ ! -f "$B/master.cfg" ]
    then
        echo "No master.cfg found nor \$BUILDBOT_CONFIG_URL!"
        echo "Please provide a master.cfg file in $B or provide a \$BUILDBOT_CONFIG_URL variable via -e"
        exit 1
    fi

else
    BUILDBOT_CONFIG_DIR=${BUILDBOT_CONFIG_DIR:-config}
    mkdir -p "$B/$BUILDBOT_CONFIG_DIR"
    # if it ends with .tar.gz then its a tarball, else its directly the file
    if echo "$BUILDBOT_CONFIG_URL" | grep '.tar.gz$' >/dev/null
    then
        until curl -sL "$BUILDBOT_CONFIG_URL" | tar -xz --strip-components=1 --directory="$B/$BUILDBOT_CONFIG_DIR"
        do
            echo "Can't download from \$BUILDBOT_CONFIG_URL: $BUILDBOT_CONFIG_URL"
            sleep 1
        done

        ln -sf "$B/$BUILDBOT_CONFIG_DIR/master.cfg" "$B/master.cfg"

        if [ -f "$B/$BUILDBOT_CONFIG_DIR/buildbot.tac" ]
        then
            ln -sf "$B/$BUILDBOT_CONFIG_DIR/buildbot.tac" "$B/buildbot.tac"
        fi
    else
        until curl -sL "$BUILDBOT_CONFIG_URL" > "$B/master.cfg"
        do
            echo "Can't download from $$BUILDBOT_CONFIG_URL: $BUILDBOT_CONFIG_URL"
        done
    fi
fi
# copy the default buildbot.tac if not provided by the config
if [ ! -f "$B/buildbot.tac" ]
then
    cp /usr/src/buildbot/buildbot.tac "$B"
fi
# Fixed buildbot master not start error in docker
rm -f "$B/twistd.pid"
# wait for db to start by trying to upgrade the master
until buildbot upgrade-master "$B"
do
    echo "Can't upgrade master yet. Waiting for database ready?"
    sleep 1
done

# we use exec so that twistd use the pid 1 of the container, and so that signals are properly forwarded
exec twistd -ny "$B/buildbot.tac"