[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] xl command autocompletion: domain names
Hi, I'm looking at implementing bash command autocompletion for xl (at least for Debian to begin with as that's what I'm familiar with, and then looking at getting it into other distros). One component that needs to be created for this is a function that enumerates all the current running domains by name. Obviously I can't use `xl list` because that requires escalated privileges. One gross solution would be to make a small setuid wrapper that just reads the domain names out of xenstore, but I think there is a better solution: By setting the process title (ie. what shows up in `ps` output - sshd does this to show the privileged and non-privileged separated processes), we can make each xl daemon show the domain it is running for. Using a title like 'xl: domain for "<dom name>" (<dom id>)', the completion script can just execute `ps`, and grep/sed/awk/whatever out the domain names for bash. Setting the process title is done by setproctitle() on BSDs, and on Linux it's implemented by overwriting the process name given at argv[0]. (In practise, it's done by creating a compat version of setproctitle() if it's not provided by the system, and then using whatever OS-dependent method one should be using inside of that. openssl, nginx, util-linux, sendmail etc. have existing implementations to base off of.) I don't think this violates any 'soft' privilege boundary as existing qemu DMs already show the domain name they are running for in their command lines, visible to normal users with `ps`. It should also be a reasonable solution technically - one nice side effect of this method is that only domains created by xl will be autocompleted; ones from other toolstacks won't, which makes sense. Thoughts? Does setting process titles in xl daemons seem like the way to go? - Matthew _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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