On 21.05.2015 12:33, Umer Khan wrote: > Hi all, > > I am new to libvirt, I am trying to execute some commands inside guest > domains from my host machine using libvirt-Python API. So far I have been > able to open up a stream but I am not sure how to send commands on the > stream (through virDomainOpenConsole). After hours of searching through > different forums I found out that there is a utlity called qemu-guest agent > which can solve my problem. But I am not sure how to enable this agent on > host and domain, and how this will be used to communicate to guest domains. > Any help in this matter will be really appreciated. > > Thanks > > > http://wiki.libvirt.org/page/Qemu_guest_agent After you've set up the guest agent (both in libvirt and in guest), you can passtrhough an arbitrary guest agent commands too: http://git.qemu.org/?p=qemu.git;a=blob;f=qga/qapi-schema.json;h=b446dc729dc18f1f290e414bc857144cadc9931c;hb=HEAD Although I should warn you that qemu-ga does not allow arbitrary OS command execution. To do that you'd need to use a console. I think virsh is a good example on that: http://libvirt.org/git/?p=libvirt.git;a=blob;f=tools/virsh-console.c;h=f0faf8cb39f5242e023f785a5d3d957659c3ca0c;hb=HEAD#l308 Long story short, you create a new stream @st by calling virStreamNew(). Then you open a console and connect the stream onto it: virDomainOpenConsole(dom, dev_name, st, flags); then you register two events into the event loop, one to watch if STDIN is readable (= has some data to send = somebody typed something), the other to watch if STDOUT is writable (it can be redirected to a file or whatever, which is not necessarily always writable). The third event you register is to handle the stream. This is the idea: streamEvent() { if (stream_readable) { read data from stream into terminal buffer make STDOUT handler listen to writable event } if (stream_writable and stream buffer != empty) { send data to stream from stream buffer } if (terminal buffer == empty) make stream handler listen to readable event } stdin_event() { read data from STDIN into stream buffer make stream handler listen to readable | writable event } stdout_event() { write data from terminal buffer to STDOUT if (terminal buffer == empty) temporarily disable stdout handler } I hope this makes it something clearer. Michal _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
