[3/3] common/populate: add verity files to populate xfs images

Commit Message

Darrick J. Wong March 17, 2024, 4:39 p.m. UTC

From: Darrick J. Wong <[e-mail]>

If verity is enabled on a filesystem, we should create some sample
verity files.

Signed-off-by: Darrick J. Wong <[e-mail]>
---
 common/populate |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

Patch

diff --git a/common/populate b/common/populate
index 35071f4210..3f3ec0480d 100644
--- a/common/populate
+++ b/common/populate
@@ -520,6 +520,27 @@  _scratch_xfs_populate() {
 		done
 	fi
 
+	# verity merkle trees
+	is_verity="$(_xfs_has_feature "$SCRATCH_MNT" verity -v)"
+	if [ $is_verity -gt 0 ]; then
+		echo "+ fsverity"
+
+		# Create a biggish file with all zeroes, because metadump
+		# won't preserve data blocks and we don't want the hashes to
+		# stop working for our sample fs.
+		for ((pos = 0, i = 88; pos < 23456789; pos += 234567, i++)); do
+			$XFS_IO_PROG -f -c "pwrite -S 0 $pos 234567" "$SCRATCH_MNT/verity"
+		done
+
+		fsverity enable "$SCRATCH_MNT/verity"
+
+		# Create a sparse file
+		$XFS_IO_PROG -f -c "pwrite -S 0 0 3" "$SCRATCH_MNT/sparse_verity"
+		truncate -s 23456789 "$SCRATCH_MNT/sparse_verity"
+		$XFS_IO_PROG -f -c "pwrite -S 0 23456789 3" "$SCRATCH_MNT/sparse_verity"
+		fsverity enable "$SCRATCH_MNT/sparse_verity"
+	fi
+
 	# Copy some real files (xfs tests, I guess...)
 	echo "+ real files"
 	test $fill -ne 0 && __populate_fill_fs "${SCRATCH_MNT}" 5