Dockerfile

# syntax=docker/dockerfile:1

# bump: librtmp /LIBRTMP_COMMIT=([[:xdigit:]]+)/ gitrefs:https://git.ffmpeg.org/rtmpdump.git|re:#^refs/heads/master$#|@commit
# bump: librtmp after ./hashupdate Dockerfile LIBRTMP $LATEST
# bump: librtmp link "Commit diff $CURRENT..$LATEST" https://git.ffmpeg.org/gitweb/rtmpdump.git/commitdiff/$LATEST?ds=sidebyside
ARG LIBRTMP_URL="https://git.ffmpeg.org/rtmpdump.git"
ARG LIBRTMP_COMMIT=138fdb258d9fc26f1843fd1b891180416c9dc575

# Must be specified
ARG ALPINE_VERSION

FROM alpine:${ALPINE_VERSION} AS base

FROM base AS download
ARG LIBRTMP_URL
ARG LIBRTMP_COMMIT
WORKDIR /tmp
RUN \
  apk add --no-cache --virtual download \
    git && \
  git clone "$LIBRTMP_URL" rtmpdump && \
  cd rtmpdump && git checkout --recurse-submodules $LIBRTMP_COMMIT && \
  apk del download

FROM base AS build
COPY --from=download /tmp/rtmpdump/ /tmp/rtmpdump/
WORKDIR /tmp/rtmpdump
RUN \
  apk add --no-cache --virtual build \
    build-base pkgconf \
    openssl-dev openssl-libs-static \
    zlib-dev zlib-static \
    linux-headers && \
  make SYS=posix SHARED=off -j$(nproc) install && \
  pkg-config --exists --modversion --path librtmp && \
  ar -t /usr/local/lib/librtmp.a && \
  readelf -h /usr/local/lib/librtmp.a && \
  apk del build

FROM scratch
ARG LIBRTMP_COMMIT
COPY --from=build /usr/local/lib/pkgconfig/librtmp.pc /usr/local/lib/pkgconfig/librtmp.pc
COPY --from=build /usr/local/lib/librtmp.a /usr/local/lib/librtmp.a
COPY --from=build /usr/local/include/librtmp/ /usr/local/include/librtmp/