On Sat, Jun 12, 2021, 8:01 AM Neal Gompa <ngomp...@gmail.com> wrote: > On Sat, Jun 12, 2021 at 7:54 AM Josh Boyer <jwbo...@fedoraproject.org> > wrote: > > > > > > > > On Thu, Jun 10, 2021, 8:35 AM Stephen Gallagher <sgall...@redhat.com> > wrote: > >> > >> On Thu, Jun 10, 2021 at 5:51 AM Richard W.M. Jones <rjo...@redhat.com> > wrote: > >> > > >> > On Thu, Jun 10, 2021 at 09:39:38AM +0100, Ankur Sinha wrote: > >> > > On Thu, Jun 10, 2021 09:02:47 +0100, Richard W.M. Jones wrote: > >> > > > > >> > > > This appeared yesterday: > >> > > > https://src.fedoraproject.org/container/libguestfs > >> > > > > >> > > > I'm wondering what it is? > >> > > > >> > > That should be the container image generated from the Fedora > package for > >> > > the Fedora registry: > >> > > > >> > > https://docs.fedoraproject.org/en-US/containers/ > >> > > >> > So it would be a container built on top of Fedora Rawhide containing > >> > libguestfs? Do we intend to build containers like this from other > >> > Fedora packages? I'm curious what the use case is. > >> > > >> > (NB: this is not an objection to anything, people can build containers > >> > for whatever they want for all I care) > >> > > >> > >> This specific example is to address one of the FESCo concerns about > >> the cloud VM images using btrfs by default. Since RHEL VM host systems > >> cannot read the btrfs filesystem, we want to ship a containerized > >> version of libguestfs that CAN. > > > > > > That can what? As far as I know, libguestfs relies on the host to mount > the filesystem. A container still depends on the host kernel, which means > a rhel VM still isn't going to be able to mount the guest btrfs disk... > > > > At build-time, libguestfs copies the content of the kernel package > along with binaries of various filesystem tools into itself to run a > custom appliance for manipulating VMs. The Fedora-based libguestfs > package can handle Btrfs even on RHEL because it relies on the > binaries of the Fedora kernel and filesystem utilities instead of the > RHEL ones. It will run QEMU and boot up *its* VM to manipulate VM > stuff. That's even how guestfish works for mounting VM disks on the host. >
Gotcha. Thanks. josh
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