$ git clone -n https://src.fedoraproject.org/rpms/CuraEngine.git /var/lib/mock/f38-build-side-42-init-devel-894094-28549/root/chroot_tmpdir/scmroot/CuraEngine
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-894094-28549/root/chroot_tmpdir/scmroot/CuraEngine'...
$ git fetch origin be63686ab3f1b241282e52db2d4f65db898e616f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/CuraEngine
 * [new ref]         be63686ab3f1b241282e52db2d4f65db898e616f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be63686 add BR: boost-devel