$ git clone -n https://src.fedoraproject.org/rpms/perl-Paper-Specs.git /var/lib/mock/f45-build-25630-612/root/chroot_tmpdir/scmroot/perl-Paper-Specs
Cloning into '/var/lib/mock/f45-build-25630-612/root/chroot_tmpdir/scmroot/perl-Paper-Specs'...
$ git fetch origin e8788af9e54256a393674f4165f738274e9c517e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Paper-Specs
 * [new ref]         e8788af9e54256a393674f4165f738274e9c517e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e8788af Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild