modify some shell scripts to make variable references safer; modify some python scripts to reduce the code complexity and cyclomatic complexity of functions.

dev/libvirt-bootstrap.sh

@@ -45,7 +45,7 @@ echowarn() {
 #   DESCRIPTION:  Echo debug information to stdout.
 #-------------------------------------------------------------------------------
 echodebug() {
-    if [ $_ECHO_DEBUG -eq $BS_TRUE ]; then
+    if [ "${_ECHO_DEBUG}" -eq "${BS_TRUE}" ]; then
         printf "${BC} * DEBUG${EC}: %s\n" "$@";
     fi
 }
@@ -154,8 +154,7 @@ __gather_linux_system_info() {
     DISTRO_VERSION=""
 
     # Let's test if the lsb_release binary is available
-    rv=$(lsb_release >/dev/null 2>&1)
+    if lsb_release >/dev/null 2>&1; then
-    if [ $? -eq 0 ]; then
         DISTRO_NAME=$(lsb_release -si)
         if [ "x$(echo "$DISTRO_NAME" | grep RedHat)" != "x" ]; then
             # Let's convert CamelCase to Camel Case
@@ -248,7 +247,7 @@ __gather_linux_system_info() {
                         ;;
                 esac
                 ;;
-            *                  ) n="${n}"           ;
+            *                  ) ;;
         esac
         DISTRO_NAME=$n
         DISTRO_VERSION=$v
@@ -779,8 +778,7 @@ if [ "$INSTALL_FUNC" = "null" ]; then
     exit 1
 else
     echoinfo "Running ${INSTALL_FUNC}()"
-    $INSTALL_FUNC
+    if ! $INSTALL_FUNC; then
-    if [ $? -ne 0 ]; then
         echoerror "Failed to run ${INSTALL_FUNC}()!!!"
         exit 1
     fi
@@ -803,8 +801,7 @@ if [ "$POST_INSTALL_FUNC" = "null" ]; then
     exit 1
 else
     echoinfo "Running ${POST_INSTALL_FUNC}()"
-    $POST_INSTALL_FUNC
+    if ! $POST_INSTALL_FUNC; then
-    if [ $? -ne 0 ]; then
         echoerror "Failed to run ${POST_INSTALL_FUNC}()!!!"
         exit 1
     fi
@@ -827,8 +824,7 @@ if [ "$DAEMONS_RUNNING_FUNC" = "null" ]; then
     exit 1
 else
     echoinfo "Running ${DAEMONS_RUNNING_FUNC}()"
-    $DAEMONS_RUNNING_FUNC
+    if ! $DAEMONS_RUNNING_FUNC; then
-    if [ $? -ne 0 ]; then
         echoerror "Failed to run ${DAEMONS_RUNNING_FUNC}()!!!"
         exit 1
     fi

gunicorn.conf.py

@@ -75,10 +75,7 @@ backlog = 2048
 
 def get_workers():
     procs = os.sysconf('SC_NPROCESSORS_ONLN')
-    if procs > 0:
+    return procs * 2 + 1 if procs > 0 else 3
-        return procs * 2 + 1
-    else:
-        return 3
 
 
 workers = get_workers()

vrtManager/IPy.py

@@ -181,10 +181,7 @@ class IPint(object):
         if isinstance(data, INT_TYPES):
             self.ip = int(data)
             if ipversion == 0:
-                if self.ip <= MAX_IPV4_ADDRESS:
+                ipversion = 4 if self.ip <= MAX_IPV4_ADDRESS else 6
-                    ipversion = 4
-                else:
-                    ipversion = 6
             if ipversion == 4:
                 if self.ip > MAX_IPV4_ADDRESS:
                     raise ValueError("IPv4 Address can't be larger than %x: %x" % (MAX_IPV4_ADDRESS, self.ip))

vrtManager/create.py

@@ -1,4 +1,5 @@
 import string
+import contextlib
 
 from vrtManager import util
 from vrtManager.connection import wvmConnect
@@ -30,19 +31,13 @@ class wvmCreate(wvmConnect):
         """
         Function return all images on all storages
         """
-        images = list()
+        images = []
         storages = self.get_storages(only_actives=True)
         for storage in storages:
             stg = self.get_storage(storage)
-            try:
+            with contextlib.suppress(Exception):
                 stg.refresh(0)
-            except Exception:
+            images.extend(img for img in stg.listVolumes() if not img.lower().endswith(".iso"))
-                pass
-            for img in stg.listVolumes():
-                if img.lower().endswith(".iso"):
-                    pass
-                else:
-                    images.append(img)
         return images
 
     def get_os_type(self):
@@ -58,10 +53,7 @@ class wvmCreate(wvmConnect):
         stg = self.get_storage(storage)
         storage_type = util.get_xml_path(stg.XMLDesc(0), "/pool/@type")
         if storage_type == "dir":
-            if image_format in ("qcow", "qcow2"):
+            name += f".{image_format}" if image_format in ("qcow", "qcow2") else ".img"
-                name += "." + image_format
-            else:
-                name += ".img"
             alloc = 0
         else:
             image_format = 'raw'
@@ -87,28 +79,19 @@ class wvmCreate(wvmConnect):
                 </target>
             </volume>"""
         stg.createXML(xml, metadata)
-        try:
+
+        with contextlib.suppress(Exception):
             stg.refresh(0)
-        except:
-            pass
         vol = stg.storageVolLookupByName(name)
         return vol.path()
 
     def get_volume_format_type(self, path):
         vol = self.get_volume_by_path(path)
         vol_type = util.get_xml_path(vol.XMLDesc(0), "/volume/target/format/@type")
-        if vol_type == "unknown" or vol_type == "iso":
+        return "raw" if vol_type in ["unknown", "iso"] else vol_type or "raw"
-            return "raw"
-        if vol_type:
-            return vol_type
-        else:
-            return "raw"
 
     def get_volume_path(self, volume, pool=None):
-        if not pool:
+        storages = [pool] if pool else self.get_storages(only_actives=True)
-            storages = self.get_storages(only_actives=True)
-        else:
-            storages = [pool]
         for storage in storages:
             stg = self.get_storage(storage)
             if stg.info()[0] != 0:
@@ -124,10 +107,7 @@ class wvmCreate(wvmConnect):
 
     def clone_from_template(self, clone, template, storage=None, metadata=False, disk_owner_uid=0, disk_owner_gid=0):
         vol = self.get_volume_by_path(template)
-        if not storage:
+        stg = self.get_storage(storage) if storage else vol.storagePoolLookupByVolume()
-            stg = vol.storagePoolLookupByVolume()
-        else:
-            stg = self.get_storage(storage)
 
         storage_type = util.get_xml_path(stg.XMLDesc(0), "/pool/@type")
         format = util.get_xml_path(vol.XMLDesc(0), "/volume/target/format/@type")
@@ -226,12 +206,8 @@ class wvmCreate(wvmConnect):
 
         if caps["features"]:
             xml += """<features>"""
-            if "acpi" in caps["features"]:
+            for feat in [x for x in ("acpi", "apic", "pae",) if x in caps["features"]]:
-                xml += """<acpi/>"""
+                xml += f"""<{feat}/>"""
-            if "apic" in caps["features"]:
-                xml += """<apic/>"""
-            if "pae" in caps["features"]:
-                xml += """<pae/>"""
             if firmware.get("secure", "no") == "yes":
                 xml += """<smm state="on"/>"""
             xml += """</features>"""
@@ -240,9 +216,7 @@ class wvmCreate(wvmConnect):
             xml += """<cpu mode='host-model'/>"""
         elif vcpu_mode == "host-passthrough":
             xml += """<cpu mode='host-passthrough'/>"""
-        elif vcpu_mode == "":
+        elif vcpu_mode != "":
-            pass
-        else:
             xml += f"""<cpu mode='custom' match='exact' check='none'>
                         <model fallback='allow'>{vcpu_mode}</model>"""
             xml += """</cpu>"""
@@ -306,7 +280,7 @@ class wvmCreate(wvmConnect):
                 xml += """<target dev='hd%s' bus='%s'/>""" % (hd_disk_letters.pop(0), volume.get("bus"))
             elif volume.get("bus") == "fdc":
                 xml += """<target dev='fd%s' bus='%s'/>""" % (fd_disk_letters.pop(0), volume.get("bus"))
-            elif volume.get("bus") == "sata" or volume.get("bus") == "scsi":
+            elif volume.get("bus") in ["sata", "scsi"]:
                 xml += """<target dev='sd%s' bus='%s'/>""" % (sd_disk_letters.pop(0), volume.get("bus"))
             else:
                 xml += """<target dev='sd%s'/>""" % sd_disk_letters.pop(0)
@@ -345,14 +319,13 @@ class wvmCreate(wvmConnect):
 
         if console_pass == "random":
             console_pass = "passwd='" + util.randomPasswd() + "'"
-        else:
+        elif console_pass != "":
-            if not console_pass == "":
             console_pass = "passwd='" + console_pass + "'"
 
         if "usb" in dom_caps["disk_bus"]:
-            xml += """<input type='mouse' bus='{}'/>""".format("virtio" if virtio else "usb")
+            xml += f"""<input type='mouse' bus='{"virtio" if virtio else "usb"}'/>"""
-            xml += """<input type='keyboard' bus='{}'/>""".format("virtio" if virtio else "usb")
+            xml += f"""<input type='keyboard' bus='{"virtio" if virtio else "usb"}'/>"""
-            xml += """<input type='tablet' bus='{}'/>""".format("virtio" if virtio else "usb")
+            xml += f"""<input type='tablet' bus='{"virtio" if virtio else "usb"}'/>"""
         else:
             xml += """<input type='mouse'/>"""
             xml += """<input type='keyboard'/>"""

vrtManager/hostdetails.py

@@ -21,12 +21,11 @@ class wvmHostDetails(wvmConnect):
         freemem = self.wvm.getMemoryStats(-1, 0)
         if isinstance(freemem, dict):
             free = (freemem["buffers"] + freemem["free"] + freemem["cached"]) * 1024
-            percent = abs(100 - ((free * 100) // all_mem))
+            percent = abs(100 - free * 100 // all_mem)
             usage = all_mem - free
-            mem_usage = {"total": all_mem, "usage": usage, "percent": percent}
+            return {"total": all_mem, "usage": usage, "percent": percent}
         else:
-            mem_usage = {"total": None, "usage": None, "percent": None}
+            return {"total": None, "usage": None, "percent": None}
-        return mem_usage
 
     def get_cpu_usage(self):
         """
@@ -35,30 +34,30 @@ class wvmHostDetails(wvmConnect):
         prev_idle = 0
         prev_total = 0
         cpu = self.wvm.getCPUStats(-1, 0)
-        if isinstance(cpu, dict):
+        if not isinstance(cpu, dict):
+            return {"usage": None}
+
         for num in range(2):
             idle = self.wvm.getCPUStats(-1, 0)["idle"]
             total = sum(self.wvm.getCPUStats(-1, 0).values())
             diff_idle = idle - prev_idle
             diff_total = total - prev_total
-                diff_usage = (1000 * (diff_total - diff_idle) / diff_total + 5) / 10
+            diff_usage = (1000 * (diff_total - diff_idle) /
+                          diff_total + 5) / 10
             prev_total = total
             prev_idle = idle
             if num == 0:
                 time.sleep(1)
             else:
-                    if diff_usage < 0:
+                diff_usage = max(diff_usage, 0)
-                        diff_usage = 0
+
-        else:
-            return {"usage": None}
         return {"usage": diff_usage}
 
     def get_node_info(self):
         """
         Function return host server information: hostname, cpu, memory, ...
         """
-        info = list()
+        info = [self.wvm.getHostname()]  # hostname
-        info.append(self.wvm.getHostname())  # hostname
         info.append(self.wvm.getInfo()[0])  # architecture
         info.append(self.wvm.getInfo()[1] * 1048576)  # memory
         info.append(self.wvm.getInfo()[2])  # cpu core count

vrtManager/interface.py

@@ -57,7 +57,7 @@ class wvmInterface(wvmConnect):
         try:
             xml = self._XMLDesc(VIR_INTERFACE_XML_INACTIVE)
             return util.get_xml_path(xml, "/interface/start/@mode")
-        except:
+        except Exception:
             return None
 
     def is_active(self):
@@ -65,10 +65,7 @@ class wvmInterface(wvmConnect):
 
     def get_mac(self):
         mac = self.iface.MACString()
-        if mac:
+        return mac or None
-            return mac
-        else:
-            return None
 
     def get_type(self):
         xml = self._XMLDesc()
@@ -78,11 +75,8 @@ class wvmInterface(wvmConnect):
         try:
             xml = self._XMLDesc(VIR_INTERFACE_XML_INACTIVE)
             ipaddr = util.get_xml_path(xml, "/interface/protocol[@family='ipv4']/ip/@address")
-            if ipaddr:
+            return "static" if ipaddr else "dhcp"
-                return "static"
+        except Exception:
-            else:
-                return "dhcp"
-        except:
             return None
 
     def get_ipv4(self):
@@ -92,17 +86,14 @@ class wvmInterface(wvmConnect):
         if not int_ipv4_ip or not int_ipv4_mask:
             return None
         else:
-            return int_ipv4_ip + "/" + int_ipv4_mask
+            return f"{int_ipv4_ip}/{int_ipv4_mask}"
 
     def get_ipv6_type(self):
         try:
             xml = self._XMLDesc(VIR_INTERFACE_XML_INACTIVE)
             ipaddr = util.get_xml_path(xml, "/interface/protocol[@family='ipv6']/ip/@address")
-            if ipaddr:
+            return "static" if ipaddr else "dhcp"
-                return "static"
+        except Exception:
-            else:
-                return "dhcp"
-        except:
             return None
 
     def get_ipv6(self):
@@ -112,23 +103,24 @@ class wvmInterface(wvmConnect):
         if not int_ipv6_ip or not int_ipv6_mask:
             return None
         else:
-            return int_ipv6_ip + "/" + int_ipv6_mask
+            return f"{int_ipv6_ip}/{int_ipv6_mask}"
 
     def get_bridge(self):
         bridge = None
-        if self.get_type() == "bridge":
+        if self.get_type() != "bridge":
+            return None
         bridge = util.get_xml_path(self._XMLDesc(), "/interface/bridge/interface/@name")
         for iface in self.get_bridge_slave_ifaces():
             if iface.get("state") == "up" and iface.get("speed") != "unknown":
                 bridge = iface.get("name")
                 return bridge
         return bridge
-        else:
-            return None
 
     def get_bridge_slave_ifaces(self):
-        ifaces = list()
+        if self.get_type() != "bridge":
-        if self.get_type() == "bridge":
+            return None
+
+        ifaces = []
         tree = ElementTree.fromstring(self._XMLDesc())
         for iface in tree.findall("./bridge/"):
             address = state = speed = None
@@ -143,8 +135,6 @@ class wvmInterface(wvmConnect):
                 address = mac.get("address")
             ifaces.append({"name": name, "type": if_type, "state": state, "speed": speed, "mac": address})
         return ifaces
-        else:
-            return None
 
     def get_details(self):
         mac = self.get_mac()

vrtManager/network.py

@@ -23,10 +23,8 @@ def network_size(subnet, dhcp=None):
     if addr.version() == 6:
         mask = mask.lstrip("/") if "/" in mask else mask
         dhcp_pool = [IP(addr[0].strCompressed() + hex(256)), IP(addr[0].strCompressed() + hex(512 - 1))]
-    if dhcp:
+
-        return gateway, mask, dhcp_pool
+    return (gateway, mask, dhcp_pool) if dhcp else (gateway, mask, None)
-    else:
-        return gateway, mask, None
 
 
 class wvmNetworks(wvmConnect):
@@ -43,6 +41,7 @@ class wvmNetworks(wvmConnect):
 
             net_forward = util.get_xml_path(net.XMLDesc(0), "/network/forward/@mode")
             networks.append({"name": network, "status": net_status, "device": net_bridge, "forward": net_forward})
+
         return networks
 
     def define_network(self, xml):
@@ -137,7 +136,7 @@ class wvmNetwork(wvmConnect):
     def get_bridge_device(self):
         try:
             return self.net.bridgeName()
-        except:
+        except Exception:
             return util.get_xml_path(self._XMLDesc(0), "/network/forward/interface/@dev")
 
     def start(self):
@@ -153,7 +152,7 @@ class wvmNetwork(wvmConnect):
         return self.net.update(command, section, parentIndex, xml, flags)
 
     def get_ip_networks(self):
-        ip_networks = dict()
+        ip_networks = {}
         xml = self._XMLDesc(0)
         if util.get_xml_path(xml, "/network/ip") is None:
             return ip_networks
@@ -164,10 +163,10 @@ class wvmNetwork(wvmConnect):
             netmask_str = ip.get("netmask")
             prefix = ip.get("prefix")
             family = ip.get("family", "ipv4")
-            base = 32 if family == "ipv4" else 128
             if prefix:
                 prefix = int(prefix)
-                binstr = (prefix * "1") + ((base - prefix) * "0")
+                base = 32 if family == "ipv4" else 128
+                binstr = prefix * "1" + (base - prefix) * "0"
                 netmask_str = str(IP(int(binstr, base=2)))
 
             if netmask_str:
@@ -183,8 +182,7 @@ class wvmNetwork(wvmConnect):
 
     def get_network_mac(self):
         xml = self._XMLDesc(0)
-        mac = util.get_xml_path(xml, "/network/mac/@address")
+        return util.get_xml_path(xml, "/network/mac/@address")
-        return mac
 
     def get_network_forward(self):
         xml = self._XMLDesc(0)
@@ -201,22 +199,15 @@ class wvmNetwork(wvmConnect):
             dhcpstart = util.get_xml_path(xml, "/network/ip[@family='ipv6']/dhcp/range[1]/@start")
             dhcpend = util.get_xml_path(xml, "/network/ip[@family='ipv6']/dhcp/range[1]/@end")
 
-        if not dhcpstart or not dhcpend:
+        return None if not dhcpstart or not dhcpend else [IP(dhcpstart), IP(dhcpend)]
-            return None
-
-        return [IP(dhcpstart), IP(dhcpend)]
 
     def get_dhcp_range_start(self, family="ipv4"):
         dhcp = self.get_dhcp_range(family)
-        if not dhcp:
+        return dhcp[0] if dhcp else None
-            return None
-        return dhcp[0]
 
     def get_dhcp_range_end(self, family="ipv4"):
         dhcp = self.get_dhcp_range(family)
-        if not dhcp:
+        return dhcp[1] if dhcp else None
-            return None
-        return dhcp[1]
 
     def can_pxe(self):
         xml = self._XMLDesc(0)
@@ -226,12 +217,12 @@ class wvmNetwork(wvmConnect):
         return bool(util.get_xml_path(xml, "/network/ip/dhcp/bootp/@file"))
 
     def get_dhcp_host_addr(self, family="ipv4"):
-        result = list()
+        result = []
         tree = etree.fromstring(self._XMLDesc(0))
-
         for ipdhcp in tree.findall("./ip"):
             if family == "ipv4":
-                if ipdhcp.get("family") is None:
+                if ipdhcp.get("family") is not None:
+                    continue
                 hosts = ipdhcp.findall("./dhcp/host")
                 for host in hosts:
                     host_ip = host.get("ip")
@@ -239,8 +230,6 @@ class wvmNetwork(wvmConnect):
                     name = host.get("name", "")
                     result.append({"ip": host_ip, "mac": mac, "name": name})
                 return result
-                else:
-                    continue
             if family == "ipv6":
                 hosts = tree.xpath("./ip[@family='ipv6']/dhcp/host")
                 for host in hosts:
@@ -272,9 +261,9 @@ class wvmNetwork(wvmConnect):
         for h in hosts:
             if h.get("ip") == ip:
                 if family == "ipv4":
-                    new_xml = '<host mac="{}" name="{}" ip="{}"/>'.format(h.get("mac"), h.get("name"), ip)
+                    new_xml = f'<host mac="{h.get("mac")}" name="{h.get("name")}" ip="{ip}"/>'
                 if family == "ipv6":
-                    new_xml = '<host id="{}" name="{}" ip="{}"/>'.format(h.get("id"), h.get("name"), ip)
+                    new_xml = f'<host id="{h.get("id")}" name="{h.get("name")}" ip="{ip}"/>'
 
                 self.update(
                     VIR_NETWORK_UPDATE_COMMAND_DELETE,
@@ -298,12 +287,7 @@ class wvmNetwork(wvmConnect):
             compare_var = "id"
             parent_index = self.parent_count - 1
         new_host_xml = etree.fromstring(new_xml)
-
+        host = next((h for h in hosts if h.get(compare_var) == mac_duid), None)
-        host = None
-        for h in hosts:
-            if h.get(compare_var) == mac_duid:
-                host = h
-                break
         if host is None:
             self.update(
                 VIR_NETWORK_UPDATE_COMMAND_ADD_LAST,
@@ -326,7 +310,7 @@ class wvmNetwork(wvmConnect):
                 )
 
     def get_qos(self):
-        qos_values = dict()
+        qos_values = {}
         tree = etree.fromstring(self._XMLDesc(0))
         qos = tree.xpath("/network/bandwidth")
         if qos:
@@ -348,13 +332,10 @@ class wvmNetwork(wvmConnect):
         return qos_values
 
     def set_qos(self, direction, average, peak, burst):
-        if direction == "inbound":
+        if direction not in ("inbound","outbound"):
-            xml = f"<inbound average='{average}' peak='{peak}' burst='{burst}'/>"
-        elif direction == "outbound":
-            xml = f"<outbound average='{average}' peak='{peak}' burst='{burst}'/>"
-        else:
             raise Exception("Direction must be inbound or outbound")
 
+        xml = f"<{direction} average='{average}' peak='{peak}' burst='{burst}'/>"
         tree = etree.fromstring(self._XMLDesc(0))
 
         band = tree.xpath("/network/bandwidth")
@@ -388,7 +369,7 @@ class wvmNetwork(wvmConnect):
             self.leases = self.net.DHCPLeases()
         except Exception as e:
             self.leases = []
-            raise "Error getting {} DHCP leases: {}".format(self, e)
+            raise f"Error getting {self} DHCP leases: {e}" from e
 
     def get_dhcp_leases(self):
         if self.leases is None:

vrtManager/nwfilters.py

@@ -47,11 +47,8 @@ class wvmNWFilter(wvmConnect):
         return ElementTree.tostring(tree).decode()
 
     def get_filter_refs(self):
-        refs = []
         tree = ElementTree.fromstring(self._XMLDesc(0))
-        for ref in tree.findall("./filterref"):
+        return [ref.get("filter") for ref in tree.findall("./filterref")]
-            refs.append(ref.get("filter"))
-        return refs
 
     def get_rules(self):
         rules = []

vrtManager/storage.py

@@ -1,3 +1,5 @@
+import contextlib
+
 from vrtManager import util
 from vrtManager.connection import wvmConnect
 
@@ -10,10 +12,7 @@ class wvmStorages(wvmConnect):
             stg = self.get_storage(pool)
             stg_status = stg.isActive()
             stg_type = util.get_xml_path(stg.XMLDesc(0), "/pool/@type")
-            if stg_status:
+            stg_vol = len(stg.listVolumes()) if stg_status else None
-                stg_vol = len(stg.listVolumes())
-            else:
-                stg_vol = None
             stg_size = stg.info()[1]
             storages.append(
                 {"name": pool, "status": stg_status, "type": stg_type, "volumes": stg_vol, "size": stg_size}
@@ -33,7 +32,7 @@ class wvmStorages(wvmConnect):
                             <format type='lvm2'/>
                         </source>"""
         if stg_type == "logical":
-            target = "/dev/" + name
+            target = f"/dev/{name}"
         xml += f"""
                   <target>
                        <path>{target}</path>
@@ -228,23 +227,12 @@ class wvmStorage(wvmConnect):
         self.pool.refresh(0)
 
     def update_volumes(self):
-        try:
+        with contextlib.suppress(Exception):
             self.refresh()
-        except Exception:
-            pass
         vols = self.get_volumes()
-        vol_list = []
+        return [{"name": volname, "size": self.get_volume_size(volname),
-
-        for volname in vols:
-            vol_list.append(
-                {
-                    "name": volname,
-                    "size": self.get_volume_size(volname),
                  "allocation": self.get_volume_allocation(volname),
-                    "type": self.get_volume_format_type(volname),
+                 "type": self.get_volume_format_type(volname)} for volname in vols]
-                }
-            )
-        return vol_list
 
     def create_volume(self, name, size, vol_fmt="qcow2", metadata=False, disk_owner_uid=0, disk_owner_gid=0):
         size = int(size) * 1073741824
@@ -253,10 +241,7 @@ class wvmStorage(wvmConnect):
         if vol_fmt == "unknown":
             vol_fmt = "raw"
         if storage_type == "dir":
-            if vol_fmt in ("qcow", "qcow2"):
+            name += f".{vol_fmt}" if vol_fmt in ("qcow", "qcow2") else ".img"
-                name += "." + vol_fmt
-            else:
-                name += ".img"
             alloc = 0
         xml = f"""
             <volume>
@@ -300,9 +285,9 @@ class wvmStorage(wvmConnect):
         storage_type = self.get_type()
         if storage_type == "dir":
             if vol_fmt in ["qcow", "qcow2"]:
-                target_file += "." + vol_fmt
+                target_file += f".{vol_fmt}"
             else:
-                suffix = "." + file_suffix
+                suffix = f".{file_suffix}"
                 target_file += suffix if len(suffix) > 1 else ""
 
         xml = f"""

vrtManager/util.py

@@ -9,10 +9,7 @@ import lxml.etree as etree
 
 def is_kvm_available(xml):
     kvm_domains = get_xml_path(xml, "//domain/@type='kvm'")
-    if kvm_domains > 0:
+    return kvm_domains > 0
-        return True
-    else:
-        return False
 
 
 def randomMAC():
@@ -26,40 +23,40 @@ def randomMAC():
 
 def randomUUID():
     """Generate a random UUID."""
-    u = [secrets.randbelow(256) for ignore in range(0, 16)]
+    u = [secrets.randbelow(256) for _ in range(16)]
-    u[6] = (u[6] & 0x0F) | (4 << 4)
+    u[6] = u[6] & 15 | 4 << 4
-    u[8] = (u[8] & 0x3F) | (2 << 6)
+    u[8] = u[8] & 63 | 2 << 6
     return "-".join(["%02x" * 4, "%02x" * 2, "%02x" * 2, "%02x" * 2, "%02x" * 6]) % tuple(u)
 
 
 def randomPasswd(length=12, alphabet=string.ascii_letters + string.digits):
     """Generate a random password"""
-    return "".join([secrets.choice(alphabet) for i in range(length)])
+    return "".join([secrets.choice(alphabet) for _ in range(length)])
 
 
-def get_max_vcpus(conn, type=None):
+def get_max_vcpus(conn, guest_type=None):
     """@param conn: libvirt connection to poll for max possible vcpus
-    @type type: optional guest type (kvm, etc.)"""
+    @param guest_type: optional guest type (kvm, etc.)"""
     if type is None:
-        type = conn.getType()
+        guest_type = conn.getType()
     try:
-        m = conn.getMaxVcpus(type.lower())
+        m = conn.getMaxVcpus(guest_type.lower())
     except libvirt.libvirtError:
         m = 32
     return m
 
 
-def xml_escape(str):
+def xml_escape(xml_str):
     """Replaces chars ' " < > & with xml safe counterparts"""
-    if str is None:
+    if xml_str is None:
         return None
 
-    str = str.replace("&", "&amp;")
+    xml_str = xml_str.replace("&", "&amp;")
-    str = str.replace("'", "&apos;")
+    xml_str = xml_str.replace("'", "&apos;")
-    str = str.replace('"', "&quot;")
+    xml_str = xml_str.replace('"', "&quot;")
-    str = str.replace("<", "&lt;")
+    xml_str = xml_str.replace("<", "&lt;")
-    str = str.replace(">", "&gt;")
+    xml_str = xml_str.replace(">", "&gt;")
-    return str
+    return xml_str
 
 
 def compareMAC(p, q):
@@ -108,10 +105,7 @@ def get_xpath(doc, path):
     if ret is not None:
         if isinstance(ret, list):
             if len(ret) >= 1:
-                if hasattr(ret[0], "text"):
+                result = ret[0].text if hasattr(ret[0], "text") else ret[0]
-                    result = ret[0].text
-                else:
-                    result = ret[0]
         else:
             result = ret
 

webvirtcloud/common_tags.py

@@ -7,28 +7,20 @@ register = template.Library()
 
 @register.simple_tag
 def app_active(request, app_name):
-    if request.resolver_match.app_name == app_name:
+    return "active" if request.resolver_match.app_name == app_name else ""
-        return "active"
-    return ""
 
 
 @register.simple_tag
 def view_active(request, view_name):
-    if request.resolver_match.view_name == view_name:
+    return "active" if request.resolver_match.view_name == view_name else ""
-        return "active"
-    return ""
 
 
 @register.simple_tag
 def class_active(request, pattern):
-    if re.search(pattern, request.path):
     # Not sure why 'class="active"' returns class=""active""
-        return "active"
+    return "active" if re.search(pattern, request.path) else ""
-    return ""
 
 
 @register.simple_tag
 def has_perm(user, permission_codename):
-    if user.has_perm(permission_codename):
+    return bool(user.has_perm(permission_codename))
-        return True
-    return False

webvirtcloud/ldapbackend.py

@@ -50,22 +50,23 @@ try:
             isTechnician = False
 
             requeteLdap = self.get_LDAP_user(username, password, settings.LDAP_SEARCH_GROUP_FILTER_ADMINS)
+            isAdmin = requeteLdap is not None
+            isStaff = requeteLdap is not None
+
             if requeteLdap is None:
                 requeteLdap = self.get_LDAP_user(username, password, settings.LDAP_SEARCH_GROUP_FILTER_STAFF)
+                isStaff = requeteLdap is not None
+
             if requeteLdap is None:
                 requeteLdap = self.get_LDAP_user(username, password, settings.LDAP_SEARCH_GROUP_FILTER_TECHNICIANS)
+                isTechnician = requeteLdap is not None
+
             if requeteLdap is None:
                 requeteLdap = self.get_LDAP_user(username, password, settings.LDAP_SEARCH_GROUP_FILTER_USERS)
+
             if requeteLdap is None:
                 print("User does not belong to any search group. Check LDAP_SEARCH_GROUP_FILTER in settings.")
                 return None
-                    else:
-                        isTechnician = True
-                else:
-                    isStaff = True
-            else:
-                isAdmin = True
-                isStaff = True
 
             techniciansGroup = Group.objects.get(name='Technicians')
 
@@ -74,16 +75,16 @@ try:
                 attributes = UserAttributes.objects.get(user=user)
                 user.is_staff = isStaff
                 user.is_superuser = isAdmin
-                if isTechnician is False and user.groups.filter(name='Technicians').exists():
+                if not isTechnician and user.groups.filter(name='Technicians').exists():
                     user.groups.remove(techniciansGroup)
-                elif isTechnician is True and user.groups.filter(name='Technicians').exists() is False:
+                elif isTechnician and not user.groups.filter(name='Technicians').exists():
                     user.groups.add(techniciansGroup)
                 else:
                     print("The user is already in the Technicians group")
                     user.save()
                 # TODO VERIFY
             except User.DoesNotExist:
-                print("authenticate-create new user: {}".format(username))
+                print(f"authenticate-create new user: {username}")
                 user = User(username=username)
                 user.first_name = requeteLdap[1]
                 user.last_name = requeteLdap[2]
@@ -93,7 +94,7 @@ try:
                 user.is_superuser = isAdmin
                 user.set_password(uuid.uuid4().hex)
                 user.save()
-                if isTechnician is True:
+                if isTechnician:
                     user.groups.add(techniciansGroup)
                 maxInstances = 1
                 maxCpus = 1