$ git clone -n https://src.fedoraproject.org/rpms/rust-wide.git /var/lib/mock/f39-build-1445618-32653/root/chroot_tmpdir/scmroot/rust-wide
Cloning into '/var/lib/mock/f39-build-1445618-32653/root/chroot_tmpdir/scmroot/rust-wide'...
$ git fetch origin 8610288e2c1cced9371b67744c219e8c815e0744:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-wide
 * [new ref]         8610288e2c1cced9371b67744c219e8c815e0744 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8610288 Update to version 0.7.12; Fixes RHBZ#2241590