Build lslocks for Ubuntu Trusty

Dockerfile

FROM ubuntu:14.04

RUN apt-get update

RUN apt-get build-dep --assume-yes \
  util-linux

RUN apt-get install --assume-yes \
  wget \
  gnupg

WORKDIR /src

RUN wget \
  https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.22/util-linux-2.22.2.tar.gz \
  https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.22/util-linux-2.22.2.tar.sign
# v2.22 is when lslocks was introduced. Trusty has 2.20.1. Newest versions have too many dependencies.

RUN gunzip util-linux-2.22.2.tar.gz

RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys EC39C284

RUN gpg --verify util-linux-2.22.2.tar.sign

RUN tar -xf util-linux-2.22.2.tar

WORKDIR /src/util-linux-2.22.2

RUN grep -o -e '--disable-[a-z-]*' configure.ac | \
  xargs -t ./configure
# Configure with every option disabled. Still builds lslocks.

RUN make

RUN make install

WORKDIR /

CMD ["tar", "-c", "usr/bin/lslocks", "usr/share/man/man8/lslocks.8"]
# Usage: docker build -t lslocks . && docker run --rm lslocks | tar -x

# TODO use multi-stage docker for put just the resulting tar in final image