$ git clone -n https://src.fedoraproject.org/rpms/rust-half.git /var/lib/mock/f40-build-2082341-49833/root/chroot_tmpdir/scmroot/rust-half
Cloning into '/var/lib/mock/f40-build-2082341-49833/root/chroot_tmpdir/scmroot/rust-half'...
$ git fetch origin 904ff0baa7d0cb1bb9365a8cff033c4799438389:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-half
 * [new ref]         904ff0baa7d0cb1bb9365a8cff033c4799438389 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 904ff0b Update to version 2.3.1; Fixes RHBZ#2099493