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Add target_to_num method

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Opposite to num_to_target.  It will be used in future patch.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Martin Kletzander 2014-02-12 15:44:40 +01:00
parent 55e85b1612
commit a9c791b5b8
2 changed files with 28 additions and 1 deletions
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13
tests/xmlconfig.py
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@ -1027,6 +1027,16 @@ class TestXMLConfig(unittest.TestCase):
self.assertEquals("zz", VirtualDisk.num_to_target(27 * 26))
self.assertEquals("aaa", VirtualDisk.num_to_target(27 * 26 + 1))
self.assertEquals(VirtualDisk.target_to_num("hda"), 1)
self.assertEquals(VirtualDisk.target_to_num("hdb"), 2)
self.assertEquals(VirtualDisk.target_to_num("sdz"), 26)
self.assertEquals(VirtualDisk.target_to_num("sdaa"), 27)
self.assertEquals(VirtualDisk.target_to_num("vdab"), 28)
self.assertEquals(VirtualDisk.target_to_num("vdaz"), 52)
self.assertEquals(VirtualDisk.target_to_num("xvdba"), 53)
self.assertEquals(VirtualDisk.target_to_num("xvdzz"), 27 * 26)
self.assertEquals(VirtualDisk.target_to_num("xvdaaa"), 27 * 26 + 1)
disk = virtinst.VirtualDisk(utils.get_conn())
disk.bus = "ide"
@ -1035,6 +1045,9 @@ class TestXMLConfig(unittest.TestCase):
self.assertEquals("hdc", disk.generate_target(["hdb", "sda"]))
self.assertEquals("hdb", disk.generate_target(["hda", "hdd"]))
disk.bus = "scsi"
self.assertEquals("sdh", disk.generate_target(["sda", "sdg"], 1))
def testFedoraTreeinfo(self):
i = utils.make_distro_installer(
location="tests/cli-test-xml/fakefedoratree")

16
virtinst/devicedisk.py
View File

@ -1,7 +1,7 @@
#
# Classes for building disk device xml
#
# Copyright 2006-2008, 2012-2013 Red Hat, Inc.
# Copyright 2006-2008, 2012-2014 Red Hat, Inc.
# Jeremy Katz <katzj@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
@ -474,6 +474,20 @@ class VirtualDisk(VirtualDevice):
return gen_t
@staticmethod
def target_to_num(tgt):
"""
Convert disk /dev number (like hda, hdb, hdaa, etc.) to an index
"""
num = 0
if tgt[0] == 'x':
# This case is here for 'xvda'
tgt = tgt[1:]
for i, c in enumerate(reversed(tgt[2:])):
num += (ord(c) - ord('a') + 1) * (26 ** i)
return num
_XML_PROP_ORDER = [
"type", "device",
"driver_name", "driver_type",