$ git clone -n https://src.fedoraproject.org/rpms/perl-Carton.git /var/lib/mock/f45-build-22211-590/root/chroot_tmpdir/scmroot/perl-Carton
Cloning into '/var/lib/mock/f45-build-22211-590/root/chroot_tmpdir/scmroot/perl-Carton'...
$ git fetch origin cf2d4619b2252cb560e65c10c8436889ebd7d5b0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Carton
 * [new ref]         cf2d4619b2252cb560e65c10c8436889ebd7d5b0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf2d461 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild