1 files changed, 54 insertions, 0 deletions
diff --git a/scripts/make_gitrev.sh b/scripts/make_gitrev.sh
new file mode 100755
index 000000000..04be09595
--- /dev/null
+++ b/scripts/make_gitrev.sh
@@ -0,0 +1,54 @@
+#!/bin/sh
+
+#
+# CDDL HEADER START
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright (c) 2018 by Delphix. All rights reserved.
+#
+
+#
+# Generate zfs_gitrev.h.  Note that we need to do this for every
+# invocation of `make`, including for incremental builds.  Therefore we
+# can't use a zfs_gitrev.h.in file which would be processed only when
+# `configure` is run.
+#
+
+BASE_DIR=$(dirname "$0")
+
+file=${BASE_DIR}/../include/zfs_gitrev.h
+
+#
+# Set default file contents in case we bail.
+#
+rm -f "$file"
+# shellcheck disable=SC2039
+/bin/echo -e "#define\tZFS_META_GITREV \"unknown\"" >>"$file"
+
+#
+# Check if git is installed and we are in a git repo.
+#
+git rev-parse --git-dir > /dev/null 2>&1 || exit
+
+#
+# Check if there are uncommitted changes
+#
+git diff-index --quiet HEAD || exit
+
+rev=$(git describe 2>/dev/null) || exit
+
+rm -f "$file"
+# shellcheck disable=SC2039
+/bin/echo -e "#define\tZFS_META_GITREV \"${rev}\"" >>"$file"