$ git clone -n https://src.fedoraproject.org/rpms/perl-Mojo-Pg.git /var/lib/mock/f45-build-24946-607/root/chroot_tmpdir/scmroot/perl-Mojo-Pg
Cloning into '/var/lib/mock/f45-build-24946-607/root/chroot_tmpdir/scmroot/perl-Mojo-Pg'...
$ git fetch origin 66aec5efb5678bf5ed1c9c107dc94d7c492ee138:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mojo-Pg
 * [new ref]         66aec5efb5678bf5ed1c9c107dc94d7c492ee138 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66aec5e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild