Add a simple test for reproducibility

It probably needs environment changes and other differences to be more
effective, but if anything it adds a placeholder for improvement, and
shows some solidarity with the reproducible builds project that was
started in debian.

test.sh

@@ -28,3 +28,5 @@ fi
 if env | grep -q -e '^JENKINS_URL=' -e '^BUILD_TAG=jenkins'; then
 	./test/test-omv.sh
 fi
+
+./test/test-reproducible.sh

test/test-reproducible.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+# simple test for reproducibility, probably needs major improvements
+
+set -o errexit
+set -o pipefail
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"	# dir!
+cd "$DIR" >/dev/null	# work from main mgmt directory
+make build
+T=`mktemp --tmpdir -d tmp.XXX`
+cp -a ./mgmt "$T"/mgmt.1
+make clean
+make build
+cp -a ./mgmt "$T"/mgmt.2
+
+# size comparison test
+[ `stat -c '%s' "$T"/mgmt.1` -eq `stat -c '%s' "$T"/mgmt.2` ] || failures="Size of binary was not reproducible"
+
+# sha1sum test
+sha1sum "$T"/mgmt.1 > "$T"/mgmt.SHA1SUMS.1
+sha1sum "$T"/mgmt.2 > "$T"/mgmt.SHA1SUMS.2
+cat "$T"/mgmt.SHA1SUMS.1 | sed 's/mgmt\.1/mgmt\.X/' > "$T"/mgmt.SHA1SUMS.1X
+cat "$T"/mgmt.SHA1SUMS.2 | sed 's/mgmt\.2/mgmt\.X/' > "$T"/mgmt.SHA1SUMS.2X
+diff -q "$T"/mgmt.SHA1SUMS.1X "$T"/mgmt.SHA1SUMS.2X || failures=$( [ -n "${failures}" ] && echo "$failures" ; echo "SHA1SUM of binary was not reproducible" )
+
+# clean up
+if [ "$T" != '' ]; then
+	rm -rf "$T"
+fi
+make clean
+
+# display errors
+if [[ -n "${failures}" ]]; then
+	echo 'FAIL'
+	echo 'The following tests failed:'
+	echo "${failures}"
+	exit 1
+fi
+echo PASS