$ git clone -n https://src.fedoraproject.org/rpms/rust-rustversion.git /var/lib/mock/f45-build-44608-815/root/chroot_tmpdir/scmroot/rust-rustversion
Cloning into '/var/lib/mock/f45-build-44608-815/root/chroot_tmpdir/scmroot/rust-rustversion'...
$ git fetch origin d87c82f5f6bc7052fb0a930e09327d347fe0332f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustversion
 * [new ref]         d87c82f5f6bc7052fb0a930e09327d347fe0332f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d87c82f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild