$ git clone -n https://src.fedoraproject.org/rpms/perl-Shell-Guess.git /var/lib/mock/f45-build-26187-616/root/chroot_tmpdir/scmroot/perl-Shell-Guess
Cloning into '/var/lib/mock/f45-build-26187-616/root/chroot_tmpdir/scmroot/perl-Shell-Guess'...
$ git fetch origin 62501e00938650542ca4a722fb365c9b38b91fbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Shell-Guess
 * [new ref]         62501e00938650542ca4a722fb365c9b38b91fbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62501e0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild