$ git clone -n https://src.fedoraproject.org/rpms/rust-memoffset.git /var/lib/mock/f38-build-side-43-rust-devel-1416934-31458/root/chroot_tmpdir/scmroot/rust-memoffset
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1416934-31458/root/chroot_tmpdir/scmroot/rust-memoffset'...
$ git fetch origin c6db4e96686bb65340e20c86e09d0171f7a9947a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-memoffset
 * [new ref]         c6db4e96686bb65340e20c86e09d0171f7a9947a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6db4e9 Update to version 0.9.0; Fixes RHBZ#2208437