forgejo/docker/start.sh

#!/bin/sh

# Cleanup SOCAT services and s6 event folder
# On start and on shutdown in case container has been killed
rm -rf $(find /app/gogs/docker/s6/ -name 'event')
rm -rf /app/gogs/docker/s6/SOCAT_*

# Create VOLUME subfolder
for f in /data/gogs/data /data/gogs/conf /data/gogs/log /data/git /data/ssh; do
    if ! test -d $f; then
        mkdir -p $f
    fi
done

# Bind linked docker container to localhost socket using socat
USED_PORT="3000:22"
while read NAME ADDR PORT; do
    if test -z "$NAME$ADDR$PORT"; then
        continue
    elif echo $USED_PORT | grep -E "(^|:)$PORT($|:)" > /dev/null; then
        echo "init:socat | Can't bind linked container ${NAME} to localhost, port ${PORT} already in use" 1>&2
    else
        SERV_FOLDER=/app/gogs/docker/s6/SOCAT_${NAME}_${PORT}
        mkdir -p ${SERV_FOLDER}
        CMD="socat -ls TCP4-LISTEN:${PORT},fork,reuseaddr TCP4:${ADDR}:${PORT}"
        echo -e "#!/bin/sh\nexec $CMD" > ${SERV_FOLDER}/run
        chmod +x ${SERV_FOLDER}/run
        USED_PORT="${USED_PORT}:${PORT}"
        echo "init:socat | Linked container ${NAME} will be binded to localhost on port ${PORT}" 1>&2
    fi
done << EOT
$(env | sed -En 's|(.*)_PORT_([0-9]+)_TCP=tcp://(.*):([0-9]+)|\1 \3 \4|p')
EOT

# Exec CMD or S6 by default if nothing present
if [ $# -gt 0 ];then
    exec "$@"
else
    exec /usr/bin/s6-svscan /app/gogs/docker/s6/
fi