$ git clone -n https://src.fedoraproject.org/rpms/perl-Date-Calc.git /var/lib/mock/f45-build-22936-595/root/chroot_tmpdir/scmroot/perl-Date-Calc
Cloning into '/var/lib/mock/f45-build-22936-595/root/chroot_tmpdir/scmroot/perl-Date-Calc'...
$ git fetch origin 42fafe4d3661662082435c8d8824b3d9b5b6ed4b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Date-Calc
 * [new ref]         42fafe4d3661662082435c8d8824b3d9b5b6ed4b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42fafe4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild