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When booting a virtual machine with a kernel/initrd it is possible to pass command line arguments using the <cmdline>...args...</cmdline> element in the guest XML. These appear to the kernel / init process in /proc/cmdline. When booting a container we do not have a custom /proc/cmdline, but we can easily set an environment variable for it. Ideally we could pass individual arguments to the init process as a regular set of 'char *argv[]' parameters, but that would involve libvirt parsing the <cmdline> XML text. This can easily be added later, even if we add the env variable now * docs/drvlxc.html.in: Document env variables passed to LXC * src/conf/domain_conf.c: Add <cmdline> to be parsed for guests of type='exe' * src/lxc/lxc_container.c: Set LIBVIRT_LXC_CMDLINE env var