cli: disk: add driver_detect_zeroes= support

tests/cli-test-xml/compare/virt-install-many-devices.xml

@@ -35,7 +35,7 @@
       <boot order="2"/>
     </disk>
     <disk type="file" device="disk">
-      <driver name="qemu" type="qcow2" discard="unmap" error_policy="enospace"/>
+      <driver name="qemu" type="qcow2" discard="unmap" detect_zeroes="yes" error_policy="enospace"/>
       <source file="/dev/default-pool/new1.img"/>
       <target dev="vdb" bus="virtio"/>
       <readonly/>

tests/clitest.py

@@ -455,7 +455,7 @@ c.add_compare(""" \
 --cpu none \
 \
 --disk %(EXISTUPPER)s,cache=writeback,io=threads,perms=sh,serial=WD-WMAP9A966149,boot_order=2 \
---disk %(NEWIMG1)s,sparse=false,size=.001,perms=ro,error_policy=enospace,discard=unmap \
+--disk %(NEWIMG1)s,sparse=false,size=.001,perms=ro,error_policy=enospace,discard=unmap,detect_zeroes=yes \
 --disk device=cdrom,bus=sata,read_bytes_sec=1,read_iops_sec=2,total_bytes_sec=10,total_iops_sec=20,write_bytes_sec=5,write_iops_sec=6 \
 --disk size=1 \
 --disk %(BLOCKVOL)s \

virtinst/cli.py

@@ -2074,6 +2074,7 @@ ParserDisk.add_arg("bus", "bus")
 ParserDisk.add_arg("removable", "removable", is_onoff=True)
 ParserDisk.add_arg("driver_cache", "cache")
 ParserDisk.add_arg("driver_discard", "discard")
+ParserDisk.add_arg("driver_detect_zeroes", "detect_zeroes")
 ParserDisk.add_arg("driver_name", "driver_name")
 ParserDisk.add_arg("driver_type", "driver_type")
 ParserDisk.add_arg("driver_io", "io")

virtinst/devicedisk.py

@@ -470,7 +470,8 @@ class VirtualDisk(VirtualDevice):
     _XML_PROP_ORDER = [
         "type", "device",
         "driver_name", "driver_type",
-        "driver_cache", "driver_discard", "driver_io", "error_policy",
+        "driver_cache", "driver_discard", "driver_detect_zeroes",
+        "driver_io", "error_policy",
         "_source_file", "_source_dev", "_source_dir",
         "source_volume", "source_pool", "source_protocol", "source_name",
         "source_host_name", "source_host_port",
@@ -741,6 +742,7 @@ class VirtualDisk(VirtualDevice):
     shareable = XMLProperty("./shareable", is_bool=True)
     driver_cache = XMLProperty("./driver/@cache")
     driver_discard = XMLProperty("./driver/@discard")
+    driver_detect_zeroes = XMLProperty("./driver/@detect_zeroes")
     driver_io = XMLProperty("./driver/@io")
 
     error_policy = XMLProperty("./driver/@error_policy")