Fresh clone fails to build in Docker

[verdverm]

Just cloned and ran the make_rpm_docker.sh script. It gave the following error

Step 4/5 : RUN gem install fpm
 ---> Running in 7c3fa8759a69
ERROR:  Error installing fpm:
        git requires Ruby version >= 2.3.

It had more errors afterwards because of this failure (while trying to copy the missing rpm out)

Might be worth adding set -euo pipefail to the bash scripts on the second line

[verdverm]

jordansissel/fpm#1713

jordansissel/fpm#1708

[verdverm]

Dockerfile

FROM centos:7

RUN yum install -y tar wget rpm which centos-release-scl
RUN yum install -y rh-ruby23 rh-ruby23-ruby-devel gcc make rpm-build rubygems
RUN scl enable rh-ruby23 'gem install fpm'

COPY gsiam.py gsiam.conf VERSION make_rpm.sh /

make_rpm.sh

#!/bin/bash
set -euo pipefail

source VERSION

scl enable rh-ruby23 "fpm -s dir -t rpm -n ${NAME} --version ${VERSION} -p ${NAME}-${VERSION}.rpm \
      gsiam.py=/usr/lib/yum-plugins/gsiam.py \
      gsiam.conf=/etc/yum/pluginconf.d/gsiam.conf"