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From c8da29122142f498215881e8bb933de278a3809a Mon Sep 17 00:00:00 2001
From: Max Reitz <mreitz@redhat.com>
Date: Sun, 29 Dec 2013 22:06:54 +0100
Subject: [PATCH 3/8] qcow2.py: Subcommand for changing header fields

RH-Author: Max Reitz <mreitz@redhat.com>
Message-id: <1388354817-3013-3-git-send-email-mreitz@redhat.com>
Patchwork-id: 56444
O-Subject: [RHEL-7.0 qemu-kvm PATCH 2/5] qcow2.py: Subcommand for changing header fields
Bugzilla: 1004347
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Fam Zheng <famz@redhat.com>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>

From: Kevin Wolf <kwolf@redhat.com>

BZ: 1004347

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit c93331c9146719958a4b102435fcd0566da45ea2)

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 tests/qemu-iotests/qcow2.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 tests/qemu-iotests/qcow2.py |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/tests/qemu-iotests/qcow2.py b/tests/qemu-iotests/qcow2.py
index fecf5b9..44a2b45 100755
--- a/tests/qemu-iotests/qcow2.py
+++ b/tests/qemu-iotests/qcow2.py
@@ -149,6 +149,22 @@ def cmd_dump_header(fd):
     h.dump()
     h.dump_extensions()
 
+def cmd_set_header(fd, name, value):
+    try:
+        value = int(value, 0)
+    except:
+        print "'%s' is not a valid number" % value
+        sys.exit(1)
+
+    fields = (field[2] for field in QcowHeader.fields)
+    if not name in fields:
+        print "'%s' is not a known header field" % name
+        sys.exit(1)
+
+    h = QcowHeader(fd)
+    h.__dict__[name] = value
+    h.update(fd)
+
 def cmd_add_header_ext(fd, magic, data):
     try:
         magic = int(magic, 0)
@@ -205,6 +221,7 @@ def cmd_set_feature_bit(fd, group, bit):
 
 cmds = [
     [ 'dump-header',    cmd_dump_header,    0, 'Dump image header and header extensions' ],
+    [ 'set-header',     cmd_set_header,     2, 'Set a field in the header'],
     [ 'add-header-ext', cmd_add_header_ext, 2, 'Add a header extension' ],
     [ 'del-header-ext', cmd_del_header_ext, 1, 'Delete a header extension' ],
     [ 'set-feature-bit', cmd_set_feature_bit, 2, 'Set a feature bit'],
-- 
1.7.1