$ git clone -n https://src.fedoraproject.org/rpms/libvirt.git /var/lib/mock/f42-build-side-1-3521477-46113/root/chroot_tmpdir/scmroot/libvirt
Cloning into '/var/lib/mock/f42-build-side-1-3521477-46113/root/chroot_tmpdir/scmroot/libvirt'...
$ git fetch origin f80d27e126b4db70949c9cd850a1a83c7b5b89e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libvirt
 * [new ref]         f80d27e126b4db70949c9cd850a1a83c7b5b89e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f80d27e Fix build with GCC 15