$ git clone -n https://src.fedoraproject.org/rpms/perl-HTTP-CookieMonster.git /var/lib/mock/f45-build-23989-601/root/chroot_tmpdir/scmroot/perl-HTTP-CookieMonster
Cloning into '/var/lib/mock/f45-build-23989-601/root/chroot_tmpdir/scmroot/perl-HTTP-CookieMonster'...
$ git fetch origin e2e1061d63f3de4220d5c39609b69331cb9f34fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTTP-CookieMonster
 * [new ref]         e2e1061d63f3de4220d5c39609b69331cb9f34fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e2e1061 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild