$ git clone -n https://src.fedoraproject.org/rpms/perl-Email-Received.git /var/lib/mock/f45-build-23309-596/root/chroot_tmpdir/scmroot/perl-Email-Received
Cloning into '/var/lib/mock/f45-build-23309-596/root/chroot_tmpdir/scmroot/perl-Email-Received'...
$ git fetch origin 7f934ff9a5b1717233d64def0e9202cb36a6d8af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Email-Received
 * [new ref]         7f934ff9a5b1717233d64def0e9202cb36a6d8af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f934ff Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild