$ git clone -n https://src.fedoraproject.org/rpms/perl-Mail-RFC822-Address.git /var/lib/mock/f45-build-24618-605/root/chroot_tmpdir/scmroot/perl-Mail-RFC822-Address
Cloning into '/var/lib/mock/f45-build-24618-605/root/chroot_tmpdir/scmroot/perl-Mail-RFC822-Address'...
$ git fetch origin 3405c79eb736b2a1e3d4e10319c0b6bc68ff970e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mail-RFC822-Address
 * [new ref]         3405c79eb736b2a1e3d4e10319c0b6bc68ff970e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3405c79 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild