$ git clone -n https://src.fedoraproject.org/rpms/rust-x11rb-protocol.git /var/lib/mock/f38-build-side-43-rust-devel-1411325-31431/root/chroot_tmpdir/scmroot/rust-x11rb-protocol
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411325-31431/root/chroot_tmpdir/scmroot/rust-x11rb-protocol'...
$ git fetch origin c814e13e4ec7575f3d889fc5ad59eb5544b3a53c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-x11rb-protocol
 * [new ref]         c814e13e4ec7575f3d889fc5ad59eb5544b3a53c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c814e13 Initial import (rhbz#2183863)