$ git clone -n https://src.fedoraproject.org/rpms/perl-Gtk2-Ex-Carp.git /var/lib/mock/f45-build-23832-599/root/chroot_tmpdir/scmroot/perl-Gtk2-Ex-Carp
Cloning into '/var/lib/mock/f45-build-23832-599/root/chroot_tmpdir/scmroot/perl-Gtk2-Ex-Carp'...
$ git fetch origin bf54902fadcb2aa0a571d5f8c30dfeab14d8cc0b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Gtk2-Ex-Carp
 * [new ref]         bf54902fadcb2aa0a571d5f8c30dfeab14d8cc0b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf54902 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild