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diff --git a/devel/gen-testdb.sh b/devel/gen-testdb.sh
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+#!/usr/bin/env bash
+#
+# NAME
+#	gen-testdb.sh - generate test databases
+#
+# SYNOPSIS
+#	gen-testdb.sh -v NOTMUCH-VERSION [-c CORPUS-PATH] [-s TAR-SUFFIX]
+#
+# DESCRIPTION
+#	Generate a tarball containing the specified test corpus and
+#	the corresponding notmuch database, indexed using a specific
+#	version of notmuch, resulting in a specific version of the
+#	database.
+#
+#	The specific version of notmuch will be built on the fly.
+#	Therefore the script must be run within a git repository to be
+#	able to build the old versions of notmuch.
+#
+#	This script reuses the test infrastructure, and the script
+#	must be run from within the test directory.
+#
+#	The output tarballs, named database-<TAR-SUFFIX>.tar.gz, are
+#	placed in the test/test-databases directory.
+#
+# OPTIONS
+#	-v NOTMUCH-VERSION
+#		Notmuch version in terms of a git tag or commit to use
+#		for generating the database. Required.
+#
+#	-c CORPUS-PATH
+#		Path to a corpus to use for generating the
+#		database. Due to CWD changes within the test
+#		infrastructure, use absolute paths. Defaults to the
+#		test corpus.
+#
+#	-s TAR-SUFFIX
+#		Suffix for the tarball basename. Empty by default.
+#
+# EXAMPLE
+#
+#	Generate a database indexed with notmuch 0.17. Use the default
+#	test corpus. Name the tarball database-v1.tar.gz to reflect
+#	the fact that notmuch 0.17 used database version 1.
+#
+#	$ cd test
+#	$ ../devel/gen-testdb.sh -v 0.17 -s v1
+#
+# CAVEATS
+#	Test infrastructure options won't work.
+#
+#	Any existing databases with the same name will be overwritten.
+#
+#	It may not be possible to build old versions of notmuch with
+#	the set of dependencies that satisfy building the current
+#	version of notmuch.
+#
+# AUTHOR
+#	Jani Nikula <jani@nikula.org>
+#
+# LICENSE
+#	Same as notmuch test infrastructure (GPLv2+).
+#
+
+test_description="database generation abusing test infrastructure"
+
+# immediate exit on subtest failure; see test_failure_ in test-lib.sh
+immediate=t
+
+VERSION=
+CORPUS=
+SUFFIX=
+
+while getopts v:c:s: opt; do
+    case "$opt" in
+	v) VERSION="$OPTARG";;
+	c) CORPUS="$OPTARG";;
+	s) SUFFIX="-$OPTARG";;
+    esac
+done
+shift `expr $OPTIND - 1`
+
+. ./test-lib.sh
+
+SHORT_CORPUS=$(basename ${CORPUS:-database})
+DBNAME=${SHORT_CORPUS}${SUFFIX}
+TARBALLNAME=${DBNAME}.tar.xz
+
+CORPUS=${CORPUS:-${TEST_DIRECTORY}/corpus}
+
+test_expect_code 0 "notmuch version specified on the command line" \
+    "test -n ${VERSION}"
+
+test_expect_code 0 "the specified version ${VERSION} refers to a commit" \
+    "git show ${VERSION} >/dev/null 2>&1"
+
+BUILD_DIR="notmuch-${VERSION}"
+test_expect_code 0 "generate snapshot of notmuch version ${VERSION}" \
+    "git -C $TEST_DIRECTORY/.. archive --prefix=${BUILD_DIR}/ --format=tar ${VERSION} | tar x"
+
+# force version string
+git describe --match '[0-9.]*' ${VERSION} > ${BUILD_DIR}/version
+
+test_expect_code 0 "configure and build notmuch version ${VERSION}" \
+    "make -C ${BUILD_DIR}"
+
+# use the newly built notmuch
+export PATH=./${BUILD_DIR}:$PATH
+
+test_begin_subtest "verify the newly built notmuch version"
+test_expect_equal "`notmuch --version`" "notmuch `cat ${BUILD_DIR}/version`"
+
+# replace the existing mails, if any, with the specified corpus
+rm -rf ${MAIL_DIR}
+cp -a ${CORPUS} ${MAIL_DIR}
+
+test_expect_code 0 "index the corpus" \
+    "notmuch new"
+
+# wrap the resulting mail store and database in a tarball
+
+cp -a ${MAIL_DIR} ${TMP_DIRECTORY}/${DBNAME}
+tar Jcf ${TMP_DIRECTORY}/${TARBALLNAME} -C ${TMP_DIRECTORY} ${DBNAME}
+mkdir -p  ${TEST_DIRECTORY}/test-databases
+cp -a ${TMP_DIRECTORY}/${TARBALLNAME} ${TEST_DIRECTORY}/test-databases
+test_expect_code 0 "create the output tarball ${TARBALLNAME}" \
+    "test -f ${TEST_DIRECTORY}/test-databases/${TARBALLNAME}"
+
+# generate a checksum file
+test_expect_code 0 "compute checksum" \
+    "(cd ${TEST_DIRECTORY}/test-databases/ && sha256sum ${TARBALLNAME} > ${TARBALLNAME}.sha256)"
+test_done