On Debian Stretch the cmdline is something like:
qemu-system-x86_64-enable-kvm-nameguest=vmname,debug-threads=on-S-[…]
Without null characters:
qemu-system-x86_64 -enable-kvm -name guest=vmname,debug-threads=on[…]
We need to match only guest=vmname, so the regex
"^.*guest=([a-zA-Z0-9.-_-]*).*$" is simpler and match the VM name.
The precedent regex "^.*-name\x00([a-zA-Z0-9.-_-]*)\x00\-.*$" was not matching it.
BTW, It seems that \x00 does not match correctly null characters so I removed it.
The network interface parser of this plugin was overly specific before.
It relied on a specific format of the arguments handed over to kvm while
starting the VM. For example the following format was usable:
... -netdev tap,ifname=foo,...
But kvm/qemu support a variety of ways for configuring network
interfaces via the commandline. E.g. libvirt does not use the "ifname"
parameter above. Thus VMs running on a host controlled via libvirt
cannot be tracked with this plugin.
This limititation is now clearly documented in the header of the plugin.
The old parser seemed to rely on a simple "-name foo" argument format of
kvm/qemu. The changed parser also accepts the following formats:
* name,foo=bar,baz=bot
* guest=name,foo=bar
