$ git clone -n https://src.fedoraproject.org/rpms/php-pecl-igbinary.git /var/lib/mock/f42-build-862849-171171/root/chroot_tmpdir/scmroot/php-pecl-igbinary
Cloning into '/var/lib/mock/f42-build-862849-171171/root/chroot_tmpdir/scmroot/php-pecl-igbinary'...
$ git fetch origin fc4d9a8a5a72cb9b7d6c8d78e30b9189f98de142:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-pecl-igbinary
 * [new ref]         fc4d9a8a5a72cb9b7d6c8d78e30b9189f98de142 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc4d9a8 modernize spec file