$ git clone -n https://src.fedoraproject.org/rpms/libvirt.git /var/lib/mock/f38-build-side-42-init-devel-856252-28426/root/chroot_tmpdir/scmroot/libvirt
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-856252-28426/root/chroot_tmpdir/scmroot/libvirt'...
$ git fetch origin 619904f37ac1d29b5f8e1b6622945f3115e4ed32:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libvirt
 * [new ref]         619904f37ac1d29b5f8e1b6622945f3115e4ed32 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 619904f Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild