[Kimchi-devel] [PATCH 3/5] cdrom: Add convinient functions to deal with xml parse

From: Royce Lv <lvroyce(a)linux.vnet.ibm.com&gt; To format xml used to create cdrom, and to parse and filter cdrom query results, add three helper function to do this. Signed-off-by: Royce Lv <lvroyce(a)linux.vnet.ibm.com&gt; --- src/kimchi/model.py | 42 ++++++++++++++++++++++++++++++++++++++++++ src/kimchi/xmlutils.py | 5 +++++ 2 files changed, 47 insertions(+) diff --git a/src/kimchi/model.py b/src/kimchi/model.py index a21fcf7..c74c973 100644 --- a/src/kimchi/model.py +++ b/src/kimchi/model.py @@ -1672,6 +1672,48 @@ def _get_volume_xml(**kwargs): return xml +def _get_disk_xml(**kwargs): + kwargs['readonly'] = "<readonly/>" \ + if kwargs['target']['type'] == 'cdrom' else None + xml = """ + <disk type='{source[type]}' device='{target[type]}'> + <source file='{source[path]}'/> + <target dev='{target[name]}' bus='{target[bus]}'/> + {readonly} + </disk> + """.format(**kwargs) + return dict(xml=xml) + + +def _parse_vm_disks(xml_str, filter_path, filter_name, filter_val): + # xml_str: xml_str of all disks + # filter_path: xpath of the filter attribute, + # such as './disk' or './disk/target' + # filter_name: relative path of filter attr of disks etree element + # such as: type, bus + # filter_val: expected value of filter name + root = ElementTree.fromstring(xml_str) + ret = [] + xpath = "%s/[@%s='%s']" % (filter_path, filter_name, filter_val) + for disk in root.findall(xpath): + name = disk.find('./target').attrib['dev'] + ret.append(name) + + return ret + + +def _parse_device(xml_str, dev_name): + xpath = "./disk/target[@dev='%s']/.." % dev_name + root = ElementTree.fromstring(xml_str) + ret = [] + disk = root.find(xpath) + if disk: + path = disk.find('./source').attrib['file'] + return dict(name=dev_name, path=path) + else: + raise NotFoundError + + class LibvirtConnection(object): def __init__(self, uri): self.uri = uri diff --git a/src/kimchi/xmlutils.py b/src/kimchi/xmlutils.py index 51ff0ec..176ceb1 100644 --- a/src/kimchi/xmlutils.py +++ b/src/kimchi/xmlutils.py @@ -40,3 +40,8 @@ def xml_item_update(xml, xpath, value): item = root.find(xpath) item.text = value return ElementTree.tostring(root, encoding="utf-8") + +def xml_get_child(xml, xpath): + root = ElementTree.fromstring(xml) + item = root.find(xpath) + return ElementTree.tostring(item, encoding="utf-8") -- 1.8.1.2