Dockerfile

# syntax=docker/dockerfile:1

FROM ghcr.io/linuxserver/baseimage-alpine:3.21 AS buildstage

# build variables
ARG SYNCTHING_RELEASE

RUN \
 echo "**** install build packages ****" && \
  apk add --no-cache \
    build-base \
    go

RUN \
  echo "**** fetch source code ****" && \
  if [ -z ${SYNCTHING_RELEASE+x} ]; then \
    SYNCTHING_RELEASE=$(curl -sX GET "https://api.github.com/repos/syncthing/syncthing/releases/latest" \
    | awk '/tag_name/{print $4;exit}' FS='[""]'); \
  fi && \
  mkdir -p \
    /tmp/sync && \
  curl -o \
  /tmp/syncthing-src.tar.gz -L \
    "https://github.com/syncthing/syncthing/archive/${SYNCTHING_RELEASE}.tar.gz" && \
  tar xf \
  /tmp/syncthing-src.tar.gz -C \
    /tmp/sync --strip-components=1 && \
  echo "**** compile syncthing  ****" && \
  cd /tmp/sync && \
  go clean -modcache && \
  CGO_ENABLED=0 go run build.go \
    -no-upgrade \
    -version=${SYNCTHING_RELEASE} \
    build syncthing

############## runtime stage ##############
FROM ghcr.io/linuxserver/baseimage-alpine:3.21

# set version label
ARG BUILD_DATE
ARG VERSION
LABEL build_version="Linuxserver.io version:- ${VERSION} Build-date:- ${BUILD_DATE}"
LABEL maintainer="thelamer"

# environment settings
ENV HOME="/config"

RUN \
  echo "**** create var lib folder ****" && \
  install -d -o abc -g abc \
    /var/lib/syncthing && \
  printf "Linuxserver.io version: ${VERSION}\nBuild-date: ${BUILD_DATE}" > /build_version

# copy files from build stage and local files
COPY --from=buildstage /tmp/sync/syncthing /usr/bin/
COPY root/ /

# ports and volumes
EXPOSE 8384 22000/tcp 22000/udp 21027/UDP
VOLUME /config