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

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);

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.