$ git clone -n https://src.fedoraproject.org/rpms/rust-unicode-segmentation.git /var/lib/mock/f38-build-side-43-rust-devel-1413179-31443/root/chroot_tmpdir/scmroot/rust-unicode-segmentation
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1413179-31443/root/chroot_tmpdir/scmroot/rust-unicode-segmentation'...
$ git fetch origin e0ebc9632a6128e113e794411b8d4e31e3c95112:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-unicode-segmentation
 * [new ref]         e0ebc9632a6128e113e794411b8d4e31e3c95112 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e0ebc96 Update to version 1.10.1; Fixes RHBZ#2166097