$ git clone -n https://src.fedoraproject.org/rpms/rust-fedora.git /var/lib/mock/f40-build-2176018-51067/root/chroot_tmpdir/scmroot/rust-fedora
Cloning into '/var/lib/mock/f40-build-2176018-51067/root/chroot_tmpdir/scmroot/rust-fedora'...
$ git fetch origin 3ba5431370bc479afe2244686aee720940eede74:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fedora
 * [new ref]         3ba5431370bc479afe2244686aee720940eede74 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ba5431 Update to version 2.1.1; Fixes RHBZ#2248138