Explicitly unset SOURCE_DATE_EPOCH before running fs tests. In some
filesystem utils like mksquashfs, it will silently change behaviour
and cause timestamps to unexpectedly change. Reproducible builds are
good and useful for shipped artifacts, but this causes build-time
tests to fail.

Author: Steve McIntyre

Patch-Name: fs-tester-time-fail.patch
---
 tests/util/grub-fs-tester.in | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tests/util/grub-fs-tester.in b/tests/util/grub-fs-tester.in
index bfc425e1f..660691302 100644
--- a/tests/util/grub-fs-tester.in
+++ b/tests/util/grub-fs-tester.in
@@ -4,6 +4,9 @@ set -e
 
 fs="$1"
 
+# We can't have this set, or filesystem tests will fail
+unset SOURCE_DATE_EPOCH
+
 GRUBFSTEST="@builddir@/grub-fstest"
 
 tempdir=`mktemp -d "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX"` || exit 1