From: Stefan Hajnoczi <stefa...@redhat.com>
The new poke_file function sets bytes at an offset in a file given a
printf-style format string. It can be used to corrupt an image file for
test coverage of error paths.
Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
tests/qemu-iotests/common.rc | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index e9ba358..5e077c3 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -34,6 +34,12 @@ dd()
fi
}
+# poke_file 'test.img' 512 '\xff\xfe'
+poke_file()
+{
+ printf "$3" | dd "of=$1" bs=1 "seek=$2" conv=notrunc &>/dev/null
+}
+
# we need common.config
if [ "$iam" != "check" ]
then
--
1.8.3.4
