$ git clone -n https://src.fedoraproject.org/rpms/rust-uuid.git /var/lib/mock/f40-build-2644377-66503/root/chroot_tmpdir/scmroot/rust-uuid
Cloning into '/var/lib/mock/f40-build-2644377-66503/root/chroot_tmpdir/scmroot/rust-uuid'...
$ git fetch origin d8a229b864fa3c8dd68f860e6b99d7a4a0020d7d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uuid
 * [new ref]         d8a229b864fa3c8dd68f860e6b99d7a4a0020d7d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8a229b Update to version 1.8.0; Fixes RHBZ#2270213