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#!/bin/sh |
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## Container configuration |
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SOCAT_LINK=${SOCAT_LINK:-false} |
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RUN_CROND=${RUN_CROND:-false} |
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## Container utils |
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cleanup() { |
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# Cleanup SOCAT services and s6 event folder |
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# On start and on shutdown in case container has been killed |
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rm -rf $(find /app/gogs/docker/s6/ -name 'event') |
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rm -rf /app/gogs/docker/s6/SOCAT_* |
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} |
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create_volume_subfolder() { |
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# Create VOLUME subfolder |
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for f in /data/gogs/data /data/gogs/conf /data/gogs/log /data/git /data/ssh; do |
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if ! test -d $f; then |
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mkdir -p $f |
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fi |
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done |
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} |
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## Container option activators |
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create_socat_links() { |
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# Bind linked docker container to localhost socket using socat |
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USED_PORT="3000:22" |
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echo "init:socat | Socat links will be created (requested via SOCAT_LINK)" 1>&2 |
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while read NAME ADDR PORT; do |
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if test -z "$NAME$ADDR$PORT"; then |
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continue |
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elif echo $USED_PORT | grep -E "(^|:)$PORT($|:)" > /dev/null; then |
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echo "init:socat | ! Can't bind linked container ${NAME} to localhost, port ${PORT} already in use" 1>&2 |
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else |
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SERV_FOLDER=/app/gogs/docker/s6/SOCAT_${NAME}_${PORT} |
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mkdir -p ${SERV_FOLDER} |
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CMD="socat -ls TCP4-LISTEN:${PORT},fork,reuseaddr TCP4:${ADDR}:${PORT}" |
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echo -e "#!/bin/sh\nexec $CMD" > ${SERV_FOLDER}/run |
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chmod +x ${SERV_FOLDER}/run |
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USED_PORT="${USED_PORT}:${PORT}" |
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echo "init:socat | + Linked container ${NAME} will be binded to localhost on port ${PORT}" 1>&2 |
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fi |
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done << EOT |
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$(env | sed -En 's|(.*)_PORT_([0-9]+)_TCP=tcp://(.*):([0-9]+)|\1 \3 \4|p') |
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EOT |
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} |
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activate_crond () { |
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# Request s6 to run crond |
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echo "init:crond | Cron Daemon (crond) will be run as requested by s6" 1>&2 |
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rm -f /app/gogs/docker/s6/crond/down |
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} |
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deactivate_crond () { |
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# Tell s6 not to run the crond service |
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touch /app/gogs/docker/s6/crond/down |
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} |
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## Environment variable parser |
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parse_container_options () { |
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# Parse opt-in / opt-out container optionss based on environment variable |
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# SOCAT_LINK: bind linked containers to localhost via socat |
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case $(echo "$SOCAT_LINK" | tr '[:upper:]' '[:lower:]') in |
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true|1) create_socat_links;; |
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esac |
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# RUN_CROND: request crond to be run inside the container |
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case $(echo "$RUN_CROND" | tr '[:upper:]' '[:lower:]') in |
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true|1) activate_crond;; |
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*) deactivate_crond;; |
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esac |
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} |
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## Main |
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cleanup |
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create_volume_subfolder |
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parse_container_options |
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## End of initialization: exec CMD or s6 by default |
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if [ $# -gt 0 ];then |
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exec "$@" |
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else |
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exec /bin/s6-svscan /app/gogs/docker/s6/ |
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fi
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