$ git clone -n https://src.fedoraproject.org/rpms/folks.git /var/lib/mock/f40-build-773770-127378/root/chroot_tmpdir/scmroot/folks
Cloning into '/var/lib/mock/f40-build-773770-127378/root/chroot_tmpdir/scmroot/folks'...
$ git fetch origin f23dfd274e03c9818983d0284c97f8cfdad00354:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/folks
 * [new ref]         f23dfd274e03c9818983d0284c97f8cfdad00354 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f23dfd2 Update to 0.15.7