$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-SubCalls.git /var/lib/mock/f45-build-26864-619/root/chroot_tmpdir/scmroot/perl-Test-SubCalls
Cloning into '/var/lib/mock/f45-build-26864-619/root/chroot_tmpdir/scmroot/perl-Test-SubCalls'...
$ git fetch origin 303c6eda44add03fa37892ab0a303df2dd5a88df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-SubCalls
 * [new ref]         303c6eda44add03fa37892ab0a303df2dd5a88df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 303c6ed Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild