$ git clone -n https://src.fedoraproject.org/rpms/gimp-layer-via-copy-cut.git /var/lib/mock/f41-build-side-1-3126843-39527/root/chroot_tmpdir/scmroot/gimp-layer-via-copy-cut
Cloning into '/var/lib/mock/f41-build-side-1-3126843-39527/root/chroot_tmpdir/scmroot/gimp-layer-via-copy-cut'...
$ git fetch origin 63a27952b39d229c4f9221afa92bfc89e4e6d47f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gimp-layer-via-copy-cut
 * [new ref]         63a27952b39d229c4f9221afa92bfc89e4e6d47f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63a2795 Upstream dead and obsolete in favour of builtin option for GIMP 3