$ git clone -n https://src.fedoraproject.org/rpms/perl-Stream-Buffered.git /var/lib/mock/f45-build-26267-616/root/chroot_tmpdir/scmroot/perl-Stream-Buffered
Cloning into '/var/lib/mock/f45-build-26267-616/root/chroot_tmpdir/scmroot/perl-Stream-Buffered'...
$ git fetch origin 8ba1b27ea6f8bbbfccec781bba3f9a9fa61f95b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Stream-Buffered
 * [new ref]         8ba1b27ea6f8bbbfccec781bba3f9a9fa61f95b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ba1b27 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild