$ git clone -n https://src.fedoraproject.org/rpms/gnupg2.git /var/lib/mock/f42-build-867444-175505/root/chroot_tmpdir/scmroot/gnupg2
Cloning into '/var/lib/mock/f42-build-867444-175505/root/chroot_tmpdir/scmroot/gnupg2'...
$ git fetch origin 1f98d34c068545838edc3e0d7672cc148c5c2f2f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnupg2
 * [new ref]         1f98d34c068545838edc3e0d7672cc148c5c2f2f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f98d34 Rebuilt for the bin-sbin merge (2nd attempt)