$ git clone -n https://src.fedoraproject.org/rpms/php-pecl-mongodb.git /var/lib/mock/f41-build-side-1-2753409-31222/root/chroot_tmpdir/scmroot/php-pecl-mongodb
Cloning into '/var/lib/mock/f41-build-side-1-2753409-31222/root/chroot_tmpdir/scmroot/php-pecl-mongodb'...
$ git fetch origin 6a3e6d9bcbe8959b81997e301c6ca1fde2f552f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-pecl-mongodb
 * [new ref]         6a3e6d9bcbe8959b81997e301c6ca1fde2f552f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a3e6d9 update to 1.20.0