$ git clone -n https://src.fedoraproject.org/rpms/perl-File-ReadBackwards.git /var/lib/mock/f45-build-23571-598/root/chroot_tmpdir/scmroot/perl-File-ReadBackwards
Cloning into '/var/lib/mock/f45-build-23571-598/root/chroot_tmpdir/scmroot/perl-File-ReadBackwards'...
$ git fetch origin 00a3021f73249907baca3142e33a03802573ccc9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-File-ReadBackwards
 * [new ref]         00a3021f73249907baca3142e33a03802573ccc9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 00a3021 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild