Provide missing passphrase when creating a volume.
If the <encryption format='qcow'> element does not specify a secret during volume creation, generate a suitable secret and add it to the <encryption> tag. The caller can view the updated <encryption> tag using virStorageVolGetXMLDesc(). Similarly, when <encryption format='default'/> is specified while creating a qcow or qcow2-formatted volume, change the format to "qcow" and generate a secret as described above. * src/storage_encryption_conf.h (VIR_STORAGE_QCOW_PASSPHRASE_SIZE, virStorageGenerateQcowPasphrase), src/storage_encryption_conf.c (virStorageGenerateQcowPasphrase), src/libvirt_private.syms: Add virStorageGenerateQcowPasphrase(). * src/storage_backend.c (virStoragegenerateQcowEncryption, virStorageBackendCreateQemuImg): Generate a passphrase and <encryption> when creating a qcow-formatted encrypted volume and the user did not supply the information.
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