tests: qemublock: basic qcow2 tests

Add tests for backing chain handling, including a very long chain which
is fully specified in the XML and an unterminated chain.

The top level disk image would generate the following '-drive':

file-qcow2-backing-chain-encryption.xml:
-drive file=/var/lib/libvirt/images/a,encrypt.format=luks,
    encrypt.key-secret=node-b-f-encalias,format=qcow2,if=none,id=drive-dummy
-device virtio-blk-pci,scsi=off,drive=drive-dummy,id=dummy

file-qcow2-backing-chain-noopts.xml:
-drive file=/var/lib/libvirt/images/rhel7.3.1507297895,format=qcow2,if=none,id=drive-dummy
-device virtio-blk-pci,scsi=off,drive=drive-dummy,id=dummy

file-qcow2-backing-chain-unterminated.xml:
-drive file=/var/lib/libvirt/images/rhel7.3.1507297895,format=qcow2,if=none,id=drive-dummy
-device virtio-blk-pci,scsi=off,drive=drive-dummy,id=dummy
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

tests/qemublocktest.c

@@ -461,6 +461,9 @@ mymain(void)
     TEST_DISK_TO_JSON("file-raw-aio_native");
     TEST_DISK_TO_JSON("file-backing_basic-aio_threads");
     TEST_DISK_TO_JSON("file-raw-luks");
+    TEST_DISK_TO_JSON("file-qcow2-backing-chain-noopts");
+    TEST_DISK_TO_JSON("file-qcow2-backing-chain-unterminated");
+    TEST_DISK_TO_JSON("file-qcow2-backing-chain-encryption");
 
  cleanup:
     virHashFree(diskxmljsondata.schema);

tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-encryption.json

+{
+  "node-name": "node-b-f",
+  "read-only": false,
+  "driver": "qcow2",
+  "encrypt": {
+    "format": "luks",
+    "key-secret": "node-b-f-encalias"
+  },
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/a",
+    "node-name": "node-a-s",
+    "read-only": false,
+    "discard": "unmap"
+  },
+  "backing": "node-b-f"
+}
+{
+  "node-name": "node-b-f",
+  "read-only": true,
+  "driver": "qcow2",
+  "encrypt": {
+    "format": "aes",
+    "key-secret": "node-b-f-encalias"
+  },
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/b",
+    "node-name": "node-b-s",
+    "read-only": true,
+    "discard": "unmap"
+  },
+  "backing": null
+}

tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-encryption.xml

+<disk type='file' device='disk'>
+  <driver name='qemu' type='qcow2'/>
+  <source file='/var/lib/libvirt/images/a'>
+    <encryption format='luks'>
+      <secret type='passphrase' uuid='0a81f5b2-8403-7b23-c8d6-21ccc2f80d6f'/>
+    </encryption>
+    <privateData>
+      <nodenames>
+        <nodename type='storage' name='node-a-s'/>
+        <nodename type='format' name='node-b-f'/>
+      </nodenames>
+    </privateData>
+  </source>
+  <backingStore type='file' index='1'>
+    <format type='qcow2'/>
+    <source file='/var/lib/libvirt/images/b'>
+      <privateData>
+        <nodenames>
+          <nodename type='storage' name='node-b-s'/>
+          <nodename type='format' name='node-b-f'/>
+        </nodenames>
+      </privateData>
+      <encryption format='qcow'>
+        <secret type='passphrase' uuid='0a81f5b2-8403-7b23-c8d6-21ccc2f80d6f'/>
+      </encryption>
+    </source>
+    <backingStore/>
+  </backingStore>
+  <target dev='vda' bus='virtio'/>
+  <alias name='virtio-disk0'/>
+</disk>

tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-noopts.json

+{
+  "node-name": "#block126",
+  "read-only": false,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.1507297895",
+    "node-name": "#block004",
+    "read-only": false,
+    "discard": "unmap"
+  },
+  "backing": "#block313"
+}
+{
+  "node-name": "#block313",
+  "read-only": true,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.1484071872",
+    "node-name": "#block256",
+    "read-only": true,
+    "discard": "unmap"
+  },
+  "backing": "#block556"
+}
+{
+  "node-name": "#block556",
+  "read-only": true,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.1483615252",
+    "node-name": "#block418",
+    "read-only": true,
+    "discard": "unmap"
+  },
+  "backing": "#block767"
+}
+{
+  "node-name": "#block767",
+  "read-only": true,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.1483605924",
+    "node-name": "#block624",
+    "read-only": true,
+    "discard": "unmap"
+  },
+  "backing": "#block937"
+}
+{
+  "node-name": "#block937",
+  "read-only": true,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.1483605920",
+    "node-name": "#block869",
+    "read-only": true,
+    "discard": "unmap"
+  },
+  "backing": "#block1157"
+}
+{
+  "node-name": "#block1157",
+  "read-only": true,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.1483546244",
+    "node-name": "#block1047",
+    "read-only": true,
+    "discard": "unmap"
+  },
+  "backing": "#block1392"
+}
+{
+  "node-name": "#block1392",
+  "read-only": true,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.1483545901",
+    "node-name": "#block1279",
+    "read-only": true,
+    "discard": "unmap"
+  },
+  "backing": "#block1523"
+}
+{
+  "node-name": "#block1523",
+  "read-only": true,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.1483545313",
+    "node-name": "#block1444",
+    "read-only": true,
+    "discard": "unmap"
+  },
+  "backing": "#block1742"
+}
+{
+  "node-name": "#block1742",
+  "read-only": true,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.1483536402",
+    "node-name": "#block1602",
+    "read-only": true,
+    "discard": "unmap"
+  },
+  "backing": "#block1909"
+}
+{
+  "node-name": "#block1909",
+  "read-only": true,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.qcow2",
+    "node-name": "#block1864",
+    "read-only": true,
+    "discard": "unmap"
+  },
+  "backing": null
+}

tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-noopts.xml

+<disk type='file' device='disk'>
+  <driver name='qemu' type='qcow2'/>
+  <source file='/var/lib/libvirt/images/rhel7.3.1507297895'>
+    <privateData>
+      <nodenames>
+        <nodename type='storage' name='#block004'/>
+        <nodename type='format' name='#block126'/>
+      </nodenames>
+    </privateData>
+  </source>
+  <backingStore type='file' index='1'>
+    <format type='qcow2'/>
+    <source file='/var/lib/libvirt/images/rhel7.3.1484071872'>
+      <privateData>
+        <nodenames>
+          <nodename type='storage' name='#block256'/>
+          <nodename type='format' name='#block313'/>
+        </nodenames>
+      </privateData>
+    </source>
+    <backingStore type='file' index='2'>
+      <format type='qcow2'/>
+      <source file='/var/lib/libvirt/images/rhel7.3.1483615252'>
+        <privateData>
+          <nodenames>
+            <nodename type='storage' name='#block418'/>
+            <nodename type='format' name='#block556'/>
+          </nodenames>
+        </privateData>
+      </source>
+      <backingStore type='file' index='3'>
+        <format type='qcow2'/>
+        <source file='/var/lib/libvirt/images/rhel7.3.1483605924'>
+          <privateData>
+            <nodenames>
+              <nodename type='storage' name='#block624'/>
+              <nodename type='format' name='#block767'/>
+            </nodenames>
+          </privateData>
+        </source>
+        <backingStore type='file' index='4'>
+          <format type='qcow2'/>
+          <source file='/var/lib/libvirt/images/rhel7.3.1483605920'>
+            <privateData>
+              <nodenames>
+                <nodename type='storage' name='#block869'/>
+                <nodename type='format' name='#block937'/>
+              </nodenames>
+            </privateData>
+          </source>
+          <backingStore type='file' index='5'>
+            <format type='qcow2'/>
+            <source file='/var/lib/libvirt/images/rhel7.3.1483546244'>
+              <privateData>
+                <nodenames>
+                  <nodename type='storage' name='#block1047'/>
+                  <nodename type='format' name='#block1157'/>
+                </nodenames>
+              </privateData>
+            </source>
+            <backingStore type='file' index='6'>
+              <format type='qcow2'/>
+              <source file='/var/lib/libvirt/images/rhel7.3.1483545901'>
+                <privateData>
+                  <nodenames>
+                    <nodename type='storage' name='#block1279'/>
+                    <nodename type='format' name='#block1392'/>
+                  </nodenames>
+                </privateData>
+              </source>
+              <backingStore type='file' index='7'>
+                <format type='qcow2'/>
+                <source file='/var/lib/libvirt/images/rhel7.3.1483545313'>
+                  <privateData>
+                    <nodenames>
+                      <nodename type='storage' name='#block1444'/>
+                      <nodename type='format' name='#block1523'/>
+                    </nodenames>
+                  </privateData>
+                </source>
+                <backingStore type='file' index='8'>
+                  <format type='qcow2'/>
+                  <source file='/var/lib/libvirt/images/rhel7.3.1483536402'>
+                    <privateData>
+                      <nodenames>
+                        <nodename type='storage' name='#block1602'/>
+                        <nodename type='format' name='#block1742'/>
+                      </nodenames>
+                    </privateData>
+                  </source>
+                  <backingStore type='file' index='9'>
+                    <format type='qcow2'/>
+                    <source file='/var/lib/libvirt/images/rhel7.3.qcow2'>
+                      <privateData>
+                        <nodenames>
+                          <nodename type='storage' name='#block1864'/>
+                          <nodename type='format' name='#block1909'/>
+                        </nodenames>
+                      </privateData>
+                    </source>
+                    <backingStore/>
+                  </backingStore>
+                </backingStore>
+              </backingStore>
+            </backingStore>
+          </backingStore>
+        </backingStore>
+      </backingStore>
+    </backingStore>
+  </backingStore>
+  <target dev='vda' bus='virtio'/>
+  <alias name='virtio-disk0'/>
+</disk>

tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-unterminated.json

+{
+  "node-name": "#block126",
+  "read-only": false,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.1507297895",
+    "node-name": "#block004",
+    "read-only": false,
+    "discard": "unmap"
+  },
+  "backing": "#block313"
+}
+{
+  "node-name": "#block313",
+  "read-only": true,
+  "driver": "qcow2",
+  "file": {
+    "driver": "file",
+    "filename": "/var/lib/libvirt/images/rhel7.3.1484071872",
+    "node-name": "#block256",
+    "read-only": true,
+    "discard": "unmap"
+  }
+}

tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-unterminated.xml

+<disk type='file' device='disk'>
+  <driver name='qemu' type='qcow2'/>
+  <source file='/var/lib/libvirt/images/rhel7.3.1507297895'>
+    <privateData>
+      <nodenames>
+        <nodename type='storage' name='#block004'/>
+        <nodename type='format' name='#block126'/>
+      </nodenames>
+    </privateData>
+  </source>
+  <backingStore type='file' index='1'>
+    <format type='qcow2'/>
+    <source file='/var/lib/libvirt/images/rhel7.3.1484071872'>
+      <privateData>
+        <nodenames>
+          <nodename type='storage' name='#block256'/>
+          <nodename type='format' name='#block313'/>
+        </nodenames>
+      </privateData>
+    </source>
+  </backingStore>
+  <target dev='vda' bus='virtio'/>
+  <alias name='virtio-disk0'/>
+</disk>