$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-revision.git /var/lib/mock/f41-build-side-1-2954377-35544/root/chroot_tmpdir/scmroot/rust-gix-revision
Cloning into '/var/lib/mock/f41-build-side-1-2954377-35544/root/chroot_tmpdir/scmroot/rust-gix-revision'...
$ git fetch origin 35d3e1b6c3da221f43a89186a092c68d0071552b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-revision
 * [new ref]         35d3e1b6c3da221f43a89186a092c68d0071552b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35d3e1b Update to version 0.29.0 (rhbz#2307399)