$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-vendor-filterer.git /var/lib/mock/f41-build-side-1-2982157-35870/root/chroot_tmpdir/scmroot/rust-cargo-vendor-filterer
Cloning into '/var/lib/mock/f41-build-side-1-2982157-35870/root/chroot_tmpdir/scmroot/rust-cargo-vendor-filterer'...
$ git fetch origin a55203c1fec915175046d9dc8bcd8d7a1666c13e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-vendor-filterer
 * [new ref]         a55203c1fec915175046d9dc8bcd8d7a1666c13e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a55203c 0.5.14