$ git clone -n https://src.fedoraproject.org/rpms/rust-chardetng.git /var/lib/mock/f45-build-40747-775/root/chroot_tmpdir/scmroot/rust-chardetng
Cloning into '/var/lib/mock/f45-build-40747-775/root/chroot_tmpdir/scmroot/rust-chardetng'...
$ git fetch origin b3a843f9ef954ca95a5ec1f4f0ea4ed6be0d775f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-chardetng
 * [new ref]         b3a843f9ef954ca95a5ec1f4f0ea4ed6be0d775f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3a843f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild