$ git clone -n https://src.fedoraproject.org/rpms/perl-Mail-POP3Client.git /var/lib/mock/f45-build-24649-605/root/chroot_tmpdir/scmroot/perl-Mail-POP3Client
Cloning into '/var/lib/mock/f45-build-24649-605/root/chroot_tmpdir/scmroot/perl-Mail-POP3Client'...
$ git fetch origin 7b82371c2cf1d49481301b43c704d960298715e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mail-POP3Client
 * [new ref]         7b82371c2cf1d49481301b43c704d960298715e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b82371 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild