From 43e2ea9a31c301e162507a3f656b8719454df086 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Tue, 6 Aug 2013 15:44:49 +0800 Subject: [PATCH 03/13] qemu-iotests: add poke_file utility function Message-id: <1377573001-27070-4-git-send-email-famz@redhat.com> Patchwork-id: 53783 O-Subject: [RHEL-7 qemu-kvm PATCH 03/13] qemu-iotests: add poke_file utility function Bugzilla: 995866 RH-Acked-by: Paolo Bonzini RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Kevin Wolf 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 Signed-off-by: Kevin Wolf (cherry picked from commit 23ea2ecc2a43d850bc9482068201ece5da36a448) Signed-off-by: Fam Zheng --- tests/qemu-iotests/common.rc | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc index 1e9b2f4..1187b86 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 -- 1.7.1