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qcow2.py: Subcommand for changing header fields

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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2013-05-13 14:00:15 +02:00 committed by Stefan Hajnoczi
parent a00e81e98f
commit c93331c914
1 changed files with 17 additions and 0 deletions
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17
tests/qemu-iotests/qcow2.py
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@ -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'],