$ git clone -n https://src.fedoraproject.org/rpms/rust-async-stream.git /var/lib/mock/f38-build-side-42-init-devel-1396613-31051/root/chroot_tmpdir/scmroot/rust-async-stream
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1396613-31051/root/chroot_tmpdir/scmroot/rust-async-stream'...
$ git fetch origin 43d700577f69942509ad933589346ddd7f3313c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-stream
 * [new ref]         43d700577f69942509ad933589346ddd7f3313c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 43d7005 Update to version 0.3.5; Fixes RHBZ#2184739