$ git clone -n https://src.fedoraproject.org/rpms/rust-async-session.git /var/lib/mock/f38-build-side-43-rust-devel-1418518-31459/root/chroot_tmpdir/scmroot/rust-async-session
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1418518-31459/root/chroot_tmpdir/scmroot/rust-async-session'...
$ git fetch origin e35214c1a61279f2916d5ac7ca2d65c3b918058a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-session
 * [new ref]         e35214c1a61279f2916d5ac7ca2d65c3b918058a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e35214c Initial install