$ git clone -n https://src.fedoraproject.org/rpms/rust-warp.git /var/lib/mock/f41-build-1142183-21088/root/chroot_tmpdir/scmroot/rust-warp
Cloning into '/var/lib/mock/f41-build-1142183-21088/root/chroot_tmpdir/scmroot/rust-warp'...
$ git fetch origin da96f620997ea0c5898f355945b7d575712e87d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-warp
 * [new ref]         da96f620997ea0c5898f355945b7d575712e87d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da96f62 Update to version 0.3.7; Fixes RHBZ#2273700