$ git clone -n https://src.fedoraproject.org/rpms/nest.git /var/lib/mock/f38-build-side-42-init-devel-800510-28144/root/chroot_tmpdir/scmroot/nest
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-800510-28144/root/chroot_tmpdir/scmroot/nest'...
$ git fetch origin 6c5e89e8a03914252ebf2cca0ad4ba72248aa537:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nest
 * [new ref]         6c5e89e8a03914252ebf2cca0ad4ba72248aa537 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c5e89e Drop ix86 support