$ git clone -n https://src.fedoraproject.org/rpms/rust-uuid.git /var/lib/mock/f40-build-2064235-49167/root/chroot_tmpdir/scmroot/rust-uuid
Cloning into '/var/lib/mock/f40-build-2064235-49167/root/chroot_tmpdir/scmroot/rust-uuid'...
$ git fetch origin 8b910ca5de29c56312289d675dbea9dd3bf82ee9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uuid
 * [new ref]         8b910ca5de29c56312289d675dbea9dd3bf82ee9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b910ca Update to version 1.6.1; Fixes RHBZ#2250575