Re: [Libguestfs] Question: running appliance commands over guest fs (resize2fs -P).

On 09/15/2015 05:37 PM, Richard W.M. Jones wrote: >On Tue, Sep 15, 2015 at 05:17:16PM +0300, Maxim Perevedentsev wrote: >>On 09/15/2015 04:57 PM, Richard W.M. Jones wrote: >>>>2) More general, how to execute commands from appliance but make >>>>them run over image (which may not have anything but filesystem) - I >>>>saw something like that in source. >>>Not sure I understand the question? >>As I understand, guestfs runs its own kernel-like daemon that can >>run its own commands. It is used to run e.g. resize2fs or e2fsck >>over loaded disk images. But those two utilities require the >>partition not to be mounted, so they are run by daemon and do not >>require anything to exists on partition. >> >>In API I found only the 'command' command which requires the >>partition to be mounted and have kernel image on it. This cannot >>operate on empty or non-mounted partition. >You probably want to use the guestfs_debug API, ie: > > char *cmd[] = { "resize2fs", "-P", ..., NULL }; > char *ret = guestfs_debug (g, "sh", cmd); Yeah! This is just what I was looking for. Thank you :-) >It's better to add a new API however, and not difficult either: > > http://libguestfs.org/guestfs.3.html#adding-a-new-api-action > >Rich. I'll try to submit a patch when I'll have time.