Building Hyperledger Fabric
---------------------------

The following instructions assume that you have already set up your
:doc:`development environment <devenv>`.

To build Hyperledger Fabric:

::

    make dist-clean all

Building the documentation
~~~~~~~~~~~~~~~~~~~~~~~~~~

If you are contributing to the documentation, you can build the Fabric
documentation on your local machine. This allows you to check the formatting
of your changes using your web browser before you open a pull request.

You need to download the following prerequisites before you can build the
documentation:

- `Docker <https://docs.docker.com/get-docker/>`__

After you make your updates to the documentation source files, you can generate
a build that includes your changes by running the following commands:

::

    cd fabric
    make docs

This will generate all the html files in the ``docs/build/html`` folder. You can
open any file to start browsing the updated documentation using your browser. If you
want to make additional edits to the documentation, you can rerun ``make html``
to incorporate the changes.

Running the unit tests
~~~~~~~~~~~~~~~~~~~~~~

Use the following command to run all unit tests:

::

    make unit-test

To run a subset of tests, set the TEST_PKGS environment variable.
Specify a list of packages (separated by space), for example:

::

    export TEST_PKGS="github.com/hyperledger/fabric/core/ledger/..."
    make unit-test

To run a specific test use the ``-run RE`` flag where RE is a regular
expression that matches the test case name. To run tests with verbose
output use the ``-v`` flag. For example, to run the ``TestGetFoo`` test
case, change to the directory containing the ``foo_test.go`` and
call/execute

::

    go test -v -run=TestGetFoo


Running Node.js Client SDK Unit Tests
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You must also run the Node.js unit tests to ensure that the Node.js
client SDK is not broken by your changes. To run the Node.js unit tests,
follow the instructions
`here <https://github.com/hyperledger/fabric-sdk-node/blob/main/README.md>`__.

Configuration
-------------

Configuration utilizes the `viper <https://github.com/spf13/viper>`__
and `cobra <https://github.com/spf13/cobra>`__ libraries.

There is a **core.yaml** file that contains the configuration for the
peer process. Many of the configuration settings can be overridden on
the command line by setting ENV variables that match the configuration
setting, but by prefixing with *'CORE\_'*. For example, setting
`peer.networkId` can be accomplished with:

::

    CORE_PEER_NETWORKID=custom-network-id peer

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   https://creativecommons.org/licenses/by/4.0/