$ git clone -n https://src.fedoraproject.org/rpms/shim-unsigned-x64.git /var/lib/mock/f42-build-3355606-45025/root/chroot_tmpdir/scmroot/shim-unsigned-x64
Cloning into '/var/lib/mock/f42-build-3355606-45025/root/chroot_tmpdir/scmroot/shim-unsigned-x64'...
$ git fetch origin bacb81905ea6806b97b968527e5ca9b2e3f0f7b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shim-unsigned-x64
 * [new ref]         bacb81905ea6806b97b968527e5ca9b2e3f0f7b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bacb819 Migrate to SPDX license