$ git clone -n https://src.fedoraproject.org/rpms/php-mongodb.git /var/lib/mock/f41-build-side-1-2753396-31222/root/chroot_tmpdir/scmroot/php-mongodb
Cloning into '/var/lib/mock/f41-build-side-1-2753396-31222/root/chroot_tmpdir/scmroot/php-mongodb'...
$ git fetch origin 902b283c056fa72b2a18e2c3e58cc4dd74484c87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-mongodb
 * [new ref]         902b283c056fa72b2a18e2c3e58cc4dd74484c87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 902b283 1.20.0 sources