$ git clone -n https://src.fedoraproject.org/rpms/dahdi-tools.git /var/lib/mock/f42-build-3528310-46309/root/chroot_tmpdir/scmroot/dahdi-tools
Cloning into '/var/lib/mock/f42-build-3528310-46309/root/chroot_tmpdir/scmroot/dahdi-tools'...
$ git fetch origin 1e419056299062bb8eddd36b5ab9c431cf996637:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dahdi-tools
 * [new ref]         1e419056299062bb8eddd36b5ab9c431cf996637 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e41905 Add sysusers.d config file to allow rpm to create users/groups automatically