$ git clone -n https://src.fedoraproject.org/rpms/rust-sval_buffer.git /var/lib/mock/f41-build-side-1-3134936-39764/root/chroot_tmpdir/scmroot/rust-sval_buffer
Cloning into '/var/lib/mock/f41-build-side-1-3134936-39764/root/chroot_tmpdir/scmroot/rust-sval_buffer'...
$ git fetch origin f26b4d63805173537fcfb4cbbad0a965213ff075:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sval_buffer
 * [new ref]         f26b4d63805173537fcfb4cbbad0a965213ff075 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f26b4d6 no longer needed