$ git clone -n https://src.fedoraproject.org/rpms/rust-fedora.git /var/lib/mock/f40-build-2718200-72889/root/chroot_tmpdir/scmroot/rust-fedora
Cloning into '/var/lib/mock/f40-build-2718200-72889/root/chroot_tmpdir/scmroot/rust-fedora'...
$ git fetch origin 790c573c5668acdd3d353e356a54c4a7451035fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fedora
 * [new ref]         790c573c5668acdd3d353e356a54c4a7451035fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 790c573 Update to version 2.1.2; Fixes RHBZ#2273850