$ git clone -n https://src.fedoraproject.org/rpms/perl-Unix-Groups-FFI.git /var/lib/mock/f45-build-27334-622/root/chroot_tmpdir/scmroot/perl-Unix-Groups-FFI
Cloning into '/var/lib/mock/f45-build-27334-622/root/chroot_tmpdir/scmroot/perl-Unix-Groups-FFI'...
$ git fetch origin b753448bd4ca210bcff2b3c3f9e46bf2d2382a06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Unix-Groups-FFI
 * [new ref]         b753448bd4ca210bcff2b3c3f9e46bf2d2382a06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b753448 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild