Re: [Kimchi-devel] [Kimchi 4/4] Identify installation media while creating template

First, improve functions inside class. This will improve code reading, also, make more functions to split procedures like: validating disks, graphics xml and distro checking. Add separate function to identify the installation media. Signed-off-by: Ramon Medeiros <ramonn(a)linux.vnet.ibm.com&gt; --- vmtemplate.py | 122 +++++++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 108 insertions(+), 14 deletions(-) diff --git a/vmtemplate.py b/vmtemplate.py index d629226..a209578 100644 --- a/vmtemplate.py +++ b/vmtemplate.py @@ -17,6 +17,7 @@ # License along with this library; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +import magic import os import platform import psutil @@ -28,12 +29,14 @@ from lxml import etree from lxml.builder import E from wok.exception import InvalidParameter, ImageFormatError, IsoFormatError -from wok.exception import MissingParameter, OperationFailed +from wok.exception import MissingParameter, OperationFailed, InvalidOperation +from wok.xmlutils.utils import xpath_get_text from wok.plugins.kimchi import imageinfo from wok.plugins.kimchi import osinfo from wok.plugins.kimchi.isoinfo import IsoImage -from wok.plugins.kimchi.utils import check_url_path, pool_name_from_uri +from wok.plugins.kimchi.model.libvirtconnection import LibvirtConnection +from wok.plugins.kimchi.utils import check_url_path, pool_name_from_uri, get_template_by_name from wok.plugins.kimchi.xmlutils.cpu import get_cpu_xml from wok.plugins.kimchi.xmlutils.disk import get_disk_xml from wok.plugins.kimchi.xmlutils.graphics import get_graphics_xml @@ -41,6 +44,9 @@ from wok.plugins.kimchi.xmlutils.interface import get_iface_xml from wok.plugins.kimchi.xmlutils.qemucmdline import get_qemucmdline_xml from wok.plugins.kimchi.xmlutils.serial import get_serial_xml +DISK_TYPE = {"QEMU QCOW Image": "qcow2", + "data":"raw"} +ISO_TYPE = "ISO 9660 CD-ROM" # In PowerPC, memories must be aligned to 256 MiB PPC_MEM_ALIGN = 256 @@ -61,6 +67,36 @@ class VMTemplate(object): self.info = {} self.fc_host_support = args.get('fc_host_support') + # search for template with the same name + template = get_template_by_name(args.get("name")) + + # no record found: create template + if len(template) == 0: + self._create_template(args, scan) + + # template already exists: load it + else: + self.info.update(args)

+ + # Merge graphics settings + graph_args = args.get('graphics') + if graph_args: + graphics = dict(self.info['graphics']) + graphics.update(graph_args) + args['graphics'] = graphics + + # validate disks + default_disk = self.info['disks'][0] + self.info.update(args) + self._validate_disks(default_disk) + + def _create_template(self, args, scan=False): + """ + Creates a new template + """ + # identify installation media + self._identify_installation_media(args) + # Fetch defaults based on the os distro and version try: distro, version = self._get_os_info(args, scan) @@ -69,23 +105,16 @@ class VMTemplate(object): os_distro = args.get('os_distro', distro) os_version = args.get('os_version', version) entry = osinfo.lookup(os_distro, os_version) + + # update info self.info.update(entry) # Auto-generate a template name if no one is passed if 'name' not in args or args['name'] == '': args['name'] = self._gen_name(distro, version) - self.name = args['name'] - - # Merge graphics settings - graph_args = args.get('graphics') - if graph_args: - graphics = dict(self.info['graphics']) - graphics.update(graph_args) - args['graphics'] = graphics + self.info["name"] = args['name'] - default_disk = self.info['disks'][0] - # Override template values according to 'args' - self.info.update(args) + def _validate_disks(self, default_disk): disks = self.info.get('disks') basic_disk = ['index', 'format', 'pool', 'size'] @@ -94,7 +123,6 @@ class VMTemplate(object): for index, disk in enumerate(disks): disk_info = dict(default_disk) - pool_type = self._get_storage_type(disk['pool']['name']) if pool_type in ['iscsi', 'scsi']: disk_info = {'index': 0, 'format': 'raw', 'volume': None} @@ -117,6 +145,72 @@ class VMTemplate(object): disk_info['index'] = disk_info.get('index', index) self.info['disks'][index] = disk_info + def _identify_installation_media(self, args): + path = args.get("installation_media") + + # user did not passed installation media: return + if path == None: + return + + # create magic object to discover file type + file_type = magic.open(magic.MAGIC_NONE) + file_type.load() + + # file is local and exists: check if it's disk or cdrom + if path.startswith("/") and os.path.exists(path): + ftype = file_type.file(path) + + # cdrom + if ISO_TYPE in ftype: + args["cdrom"] = path + return + + # disk + for types in DISK_TYPE.keys(): + if types in ftype: + + # no disk list: create it + if args.get("disks") == None: + args["disks"] = [] + + # append disk to the list + args["disks"].insert(0, {"base": path, + "format": DISK_TYPE[types], + "index": 0 + }) + # get storage pool + pool = self._get_storagepool_from_storagevolume(path) + args["disks"][0]['pool'] = pool + return + + # not local image: set as remote ISO + elif path.startswith("http") or path.startswith("ftp"): + args["cdrom"] = path + return

+ + def _get_storagepool_from_storagevolume(self, storagevolume_path): + conn = LibvirtConnection('qemu:///system').get() + storagepools = conn.listStoragePools() + storagepools += conn.listDefinedStoragePools() + + # discover storagepool + for storagepool in storagepools: + pool = conn.storagePoolLookupByName(storagepool) + spath = xpath_get_text(pool.XMLDesc(), "/pool/target/path")[0] + pool_type = xpath_get_text(pool.XMLDesc(), "/pool/@type")[0] + for storagevolume in sorted(map(lambda x: x.decode('utf-8'), pool.listVolumes())): + + # path does not exists: continue to the next + if not os.path.exists("%s/%s" % (spath, storagevolume)): + continue + + # storagepool found: return + if os.path.samefile(storagevolume_path,"%s/%s" % (spath, storagevolume)): + return {"name": "/plugins/kimchi/storagepools/%s" % storagepool, + "type": pool_type + } + return {} + def _get_os_info(self, args, scan): distro = version = 'unknown'