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.

debian/changelog

@@ -1,3 +1,10 @@
+grub2 (2.06-5) UNRELEASED; urgency=high
+
+  [ Steve McIntyre ]
+  * Explicitly unset SOURCE_DATE_EPOCH before running fs tests
+
+ -- Steve McIntyre <93sam@debian.org>  Wed, 14 Sep 2022 22:35:49 +0100
+
 grub2 (2.06-4) unstable; urgency=high
 
   [ Steve McIntyre ]

debian/patches/fs-tester-time-fail.patch

@@ -0,0 +1,27 @@
+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

debian/patches/series

@@ -90,3 +90,4 @@ minilzo-2.10.patch
 0090-fs-btrfs-Fix-several-fuzz-issues-with-invalid-dir-it.patch
 0091-fs-btrfs-Fix-more-ASAN-and-SEGV-issues-found-with-fu.patch
 0092-fs-btrfs-Fix-more-fuzz-issues-related-to-chunks.patch
+fs-tester-time-fail.patch

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