$ git clone -n https://src.fedoraproject.org/rpms/rust-smol_str.git /var/lib/mock/f40-build-2716753-72679/root/chroot_tmpdir/scmroot/rust-smol_str
Cloning into '/var/lib/mock/f40-build-2716753-72679/root/chroot_tmpdir/scmroot/rust-smol_str'...
$ git fetch origin 99d3a229b6dcd1790a26e08fe2f361c42f4cf128:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-smol_str
 * [new ref]         99d3a229b6dcd1790a26e08fe2f361c42f4cf128 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99d3a22 Update to version 0.2.1; Fixes RHBZ#2258569