Re: [libvirt] [PATCH v4 2/8] Qemu arbitrary command-line arguments.

Implement the qemu hooks for XML namespace data. This allows us to specify a qemu XML namespace, and then specify: <qemu:commandline> <qemu:arg value='arg'/> <qemu:env name='name' value='value'/> </qemu:commandline> In the domain XML. Changes since v1: - Change the<qemu:arg>arg</qemu:arg> XML to<qemu:arg value='arg'/> XML - Fix up some memory leaks in qemuDomainDefNamespaceParse - Rename num_extra and extra to num_args and args, respectively - Fixed up some error messages - Make sure to escape user-provided data in qemuDomainDefNamespaceFormatXML Changes since v2: - Add checking to ensure environment variable names are valid - Invert the logic in qemuDomainDefNamespaceFormatXML to return early Changes since v3: - Change strspn() to c_isalpha() check of first letter of environment variable