$ git clone -n https://src.fedoraproject.org/rpms/rust-gvdb-macros.git /var/lib/mock/f45-build-42213-791/root/chroot_tmpdir/scmroot/rust-gvdb-macros
Cloning into '/var/lib/mock/f45-build-42213-791/root/chroot_tmpdir/scmroot/rust-gvdb-macros'...
$ git fetch origin fe50ea811fba29c31f046cb6bea8a3fc8b97498d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gvdb-macros
 * [new ref]         fe50ea811fba29c31f046cb6bea8a3fc8b97498d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe50ea8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild