On Sat, May 06, 2017 at 04:42:59PM +0200, Marius Bakke wrote:
> Ludovic Courtès <ludo@gnu.org> writes:
> 
> > Ricardo Wurmus <rekado@elephly.net> skribis:
> >
> >> Qemu comes with support for sharing files with a guest via Samba.  This
> >> is done by appending something like this to the qemu-system-*
> >> invocation:
> >>
> >>     … -net user,smb=$HOME/Downloads -net nic
> >>
> >> Qemu needs to be told *at configure time* where the smbd executable will
> >> be at runtime.  By default this is /usr/sbin/smbd.  Users can work
> >> around this problem by installing the “samba” package and creating a
> >> link from /usr/sbin/smbd to the actual executable.
> >>
> >> It would be better to fix this, but this would require adding samba as a
> >> dependency to Qemu, so that the location can be set at configure time.
> >> Alternatively, we could patch Qemu to look for smbd depending on an
> >> environment variable.
> >
> > See commit b344c505f4dff2ecbe981f0a0a3c3d67b222dcca, which removed the
> > dependency and Samba.  Prior to that commit, QEMU recorded the absolute
> > file name of ‘smbd’.
> >
> > The problem is that Samba is big:
> >
> > --8<---------------cut here---------------start------------->8---
> > $ guix size qemu |tail -1
> > total: 710.5 MiB
> > $ guix size qemu samba |tail -1
> > total: 1203.5 MiB
> > --8<---------------cut here---------------end--------------->8---
> >
> > Thus it’d be best if we modified QEMU to search for ‘smbd’ in $PATH.
> 
> Tangentially, would it make sense to add a "qemu-full" package? I'd like
> to add RBD support when Ceph is stable on Hydra, but that adds another
> ~300MiB to the closure (and a very expensive dependency..).

If qemu-full is something that would be generically useful, sure.
Otherwise, maybe you could bring it to the potluck!