Script to build an RPM for a version of the DUC tool via Docker

ducrpmbuild.sh

#!/usr/bin/env bash

DUC_VERSION=${1}
if [ -z "${DUC_VERSION}" ]; then
	echo >&2 "You need to provide a valid release version to package."
	exit 1
fi

if [ ! -f "duc-${DUC_VERSION}.tar.gz" ]; then
	RELEASE_BASE=https://github.com/zevv/duc/releases/download
	curl -LO \
		${RELEASE_BASE}/${DUC_VERSION}/duc-${DUC_VERSION}.tar.gz \
		|| exit 1
fi

if [ ! -f "duc-${DUC_VERSION}.spec" ]; then
	RAW_BASE=https://raw.githubusercontent.com/zevv/duc
	curl -L \
		-o duc-${DUC_VERSION}.spec \
		${RAW_BASE}/${DUC_VERSION}/build/duc.spec \
		|| exit 1
	sed -i \
		"s/^\(%global version\).*$/\1 ${DUC_VERSION}/" \
		duc-${DUC_VERSION}.spec \
		|| exit 1
fi

RHEL_VERSION=${2:-7}
if [ -z "${RHEL_VERSION}" ]; then
	echo >&2 "This should have defaulted to 7."
	exit 1
fi

DOCKER_OS="$(docker version -f "{{ .Client.Os }}")"
if [ "${DOCKER_OS}" = "windows" ]; then
	WORKDIR=$(pwd -W)
else
	WORKDIR=$(pwd)
fi

docker run -t --rm \
	--cap-add=SYS_ADMIN \
	-e MOCK_CONFIG=epel-${RHEL_VERSION}-x86_64 \
	-e SOURCES=rpmbuild/duc-${DUC_VERSION}.tar.gz \
	-e SPEC_FILE=rpmbuild/duc-${DUC_VERSION}.spec \
	-v ${WORKDIR}:/rpmbuild \
	-v ${WORKDIR}/output:/output \
	mmornati/mock-rpmbuilder \
	|| exit 1
	
echo "RPM built as output/epel-${RHEL_VERSION}-x86_64/duc-${DUC_VERSION}-1.el${RHEL_VERSION}.x86_64.rpm"

Still getting sh: /c/Program Files/Docker/Docker/resources/bin/docker: Bad address when running on windows, but should work fine under linux. Bashified version of what I'm running on my internal build server.