$ git clone -n https://src.fedoraproject.org/rpms/php-pecl-mongodb.git /var/lib/mock/f38-build-side-42-init-devel-619683-26335/root/chroot_tmpdir/scmroot/php-pecl-mongodb
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-619683-26335/root/chroot_tmpdir/scmroot/php-pecl-mongodb'...
$ git fetch origin 21e2def8c32f1fbafb9409a0c53e0e932896c1ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-pecl-mongodb
 * [new ref]         21e2def8c32f1fbafb9409a0c53e0e932896c1ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21e2def update to 1.15.1