$ git clone -n https://src.fedoraproject.org/rpms/rust-smol_str.git /var/lib/mock/f40-build-2063774-49167/root/chroot_tmpdir/scmroot/rust-smol_str
Cloning into '/var/lib/mock/f40-build-2063774-49167/root/chroot_tmpdir/scmroot/rust-smol_str'...
$ git fetch origin ab2b15a06be18ea00201caeccc4d2141a2821383:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-smol_str
 * [new ref]         ab2b15a06be18ea00201caeccc4d2141a2821383 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab2b15a Update to version 0.2.0; Fixes RHBZ#2185886