$ git clone -n https://src.fedoraproject.org/rpms/rust-heck0.3.git /var/lib/mock/f45-build-42311-792/root/chroot_tmpdir/scmroot/rust-heck0.3
Cloning into '/var/lib/mock/f45-build-42311-792/root/chroot_tmpdir/scmroot/rust-heck0.3'...
$ git fetch origin 79c4f51fff8536ddd8f1feb90a0e06642fb7e368:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-heck0.3
 * [new ref]         79c4f51fff8536ddd8f1feb90a0e06642fb7e368 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79c4f51 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild