$ git clone -n https://src.fedoraproject.org/rpms/rust-h2.git /var/lib/mock/f43-build-59176453-6571523/root/chroot_tmpdir/scmroot/rust-h2
Cloning into '/var/lib/mock/f43-build-59176453-6571523/root/chroot_tmpdir/scmroot/rust-h2'...
$ git fetch origin 2ab4a387b9aa4f415f3d241594a9d320e0c5490b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-h2
 * [new ref]         2ab4a387b9aa4f415f3d241594a9d320e0c5490b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ab4a38 Update to version 0.4.9; Fixes RHBZ#2359541