Documentation/dev-bazel.txt - gerrit - Git at Google

 = Gerrit Code Review - Building with Bazel

 Bazel build is experimental. Major missing parts:

 * Custom plugins
 * Test suites for SSH, acceptance, etc.
 * tag tests as slow, flaky, etc.

 Nice to have:

 * JGit build from local tree.
 * coverage

 [[installation]]
 == Installation

 You need to use Java 8 and Node.js for building gerrit.

 You can install Bazel from the bazel.io:
 https://www.bazel.io/versions/master/docs/install.html


 [[build]]
 == Building on the Command Line

 === Gerrit Development WAR File

 To build the Gerrit web application that includes the GWT UI and the
 PolyGerrit UI:

 ----
   bazel build gerrit
 ----

 [NOTE]
 PolyGerrit UI may require additional tools (such as npm). Please read
 the polygerrit-ui/README.md for more info.

 The output executable WAR will be placed in:

 ----
   bazel-bin/gerrit.war
 ----

 [[release]]
 === Gerrit Release WAR File

 To build the Gerrit web application that includes the GWT UI, the
 PolyGerrit UI and documentation:

 ----
   bazel build release
 ----

 The output executable WAR will be placed in:

 ----
   bazel-bin/release.war
 ----

 === Headless Mode

 To build Gerrit in headless mode, i.e. without the GWT Web UI:

 ----
   bazel build headless
 ----

 The output executable WAR will be placed in:

 ----
   bazel-bin/headless.war
 ----

 === Extension and Plugin API JAR Files

 To build the extension, plugin and GWT API JAR files:

 ----
   bazel build api
 ----

 The output archive that contains Java binaries, Java sources and
 Java docs will be placed in:

 ----
   bazel-genfiles/api.zip
 ----

 Install {extension,plugin,gwt}-api to the local maven repository:

 ----
   tools/maven/api.sh install
 ----

 Install gerrit.war to the local maven repository:

 ----
   tools/maven/api.sh war_install
 ----

 === Plugins

 ----
   bazel build plugins:core
 ----

 The output JAR files for individual plugins will be placed in:

 ----
   bazel-genfiles/plugins/<name>/<name>.jar
 ----

 The JAR files will also be packaged in:

 ----
   bazel-genfiles/plugins/core.zip
 ----

 To build a specific plugin:

 ----
   bazel build plugins/<name>
 ----

 The output JAR file will be be placed in:

 ----
   bazel-genfiles/plugins/<name>/<name>.jar
 ----

 Note that when building an individual plugin, the `core.zip` package
 is not regenerated.


 [[IDEs]]
 == Using an IDE.

 === IntelliJ

 The Gerrit build works with Bazel's link:https://ij.bazel.io[IntelliJ plugin].
 Please follow the instructions on <<dev-intellij#,IntelliJ Setup>>.

 === Eclipse

 ==== Generating the Eclipse Project

 Create the Eclipse project:

 ----
   tools/eclipse/project.py
 ----

 and then follow the link:dev-eclipse.html#setup[setup instructions].

 ==== Refreshing the Classpath

 If an updated classpath is needed, the Eclipse project can be
 refreshed and missing dependency JARs can be downloaded by running
 `project.py` again. For IntelliJ, you need to click the `Sync Project
 with BUILD Files` button of link:https://ij.bazel.io[IntelliJ plugin].

 [[documentation]]
 === Documentation

 To build only the documentation for testing or static hosting:

 ----
   bazel build Documentation:searchfree
 ----

 The html files will be bundled into `searchfree.zip` in this location:

 ----
   bazel-bin/Documentation/searchfree.zip
 ----

 To build the executable WAR with the documentation included:

 ----
   bazel build withdocs
 ----

 The WAR file will be placed in:

 ----
   bazel-bin/withdocs.war
 ----

 [[tests]]
 == Running Unit Tests

 ----
   bazel test --build_tests_only //...
 ----

 Debugging tests:

 ----
   bazel test --test_output=streamed --test_filter=com.gerrit.TestClass.testMethod  testTarget
 ----

 Debug test example:

 ----
   bazel test --test_output=streamed --test_filter=com.google.gerrit.acceptance.api.change.ChangeIT.getAmbiguous //gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/api/change:api_change
 ----

 To run a specific test group, e.g. the rest-account test group:

 ----
   bazel test //gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/rest/account:rest_account
 ----

 To run the tests against NoteDb backend:

 ----
   bazel test --test_env=GERRIT_NOTEDB=READ_WRITE //...
 ----

 To run only tests that do not use SSH:

 ----
   bazel test --test_env=GERRIT_USE_SSH=NO //...
 ----

 == Dependencies

 Dependency JARs are normally downloaded as needed, but you can
 download everything upfront.  This is useful to enable
 subsequent builds to run without network access:

 ----
   bazel fetch //...
 ----

 When downloading from behind a proxy (which is common in some corporate
 environments), it might be necessary to explicitly specify the proxy that
 is then used by `curl`:

 ----
   export http_proxy=http://<proxy_user_id>:<proxy_password>@<proxy_server>:<proxy_port>
 ----

 Redirection to local mirrors of Maven Central and the Gerrit storage
 bucket is supported by defining specific properties in
 `local.properties`, a file that is not tracked by Git:

 ----
   echo download.GERRIT = http://nexus.my-company.com/ >>local.properties
   echo download.MAVEN_CENTRAL = http://nexus.my-company.com/ >>local.properties
 ----

 The `local.properties` file may be placed in the root of the gerrit repository
 being built, or in `~/.gerritcodereview/`.  The file in the root of the gerrit
 repository has precedence.

 == Building against unpublished Maven JARs

 To build against unpublished Maven JARs, like gwtorm or PrologCafe, the custom
 JARs must be installed in the local Maven repository (`mvn clean install`) and
 `maven_jar()` must be updated to point to the `MAVEN_LOCAL` Maven repository for
 that artifact:

 [source,python]
 ----
  maven_jar(
    name = 'gwtorm',
    artifact = 'gwtorm:gwtorm:42',
    repository = MAVEN_LOCAL,
  )
 ----

 == Building against artifacts from custom Maven repositories

 To build against custom Maven repositories, two modes of operations are
 supported: with rewrite in local.properties and without.

 Without rewrite the URL of custom Maven repository can be directly passed
 to the maven_jar() function:

 [source,python]
 ----
   GERRIT_FORGE = 'http://gerritforge.com/snapshot'

   maven_jar(
     name = 'gitblit',
     artifact = 'com.gitblit:gitblit:1.4.0',
     sha1 = '1b130dbf5578ace37507430a4a523f6594bf34fa',
     repository = GERRIT_FORGE,
  )
 ----

 When the custom URL has to be rewritten, then the same logic as with Gerrit
 known Maven repository is used: Repo name must be defined that matches an entry
 in local.properties file:

 ----
   download.GERRIT_FORGE = http://my.company.mirror/gerrit-forge
 ----

 And corresponding WORKSPACE excerpt:

 [source,python]
 ----
   GERRIT_FORGE = 'GERRIT_FORGE:'

   maven_jar(
     name = 'gitblit',
     artifact = 'com.gitblit:gitblit:1.4.0',
     sha1 = '1b130dbf5578ace37507430a4a523f6594bf34fa',
     repository = GERRIT_FORGE,
  )
 ----


 [[clean-cache]]
 === Cleaning The download cache

 The cache for the Gerrit Code Review project is located in
 `~/.gerritcodereview/buck-cache/locally-built-artifacts`.

 If you really do need to clean the cache manually, then:

 ----
  rm -rf ~/.gerritcodereview/buck-cache/locally-built-artifacts
 ----

 Note that the root `buck-cache` folder should not be deleted as it also contains
 the `downloaded-artifacts` directory, which holds the artifacts that got
 downloaded (not built locally).

 [NOTE] When building with Bazel the artifacts are still cached in
 `~/.gerritcodereview/buck-cache/`. This allows Bazel to make use of
 libraries that were previously downloaded by Buck.

 GERRIT
 ------
 Part of link:index.html[Gerrit Code Review]

 SEARCHBOX
 ---------
	= Gerrit Code Review - Building with Bazel

	Bazel build is experimental. Major missing parts:

	* Custom plugins
	* Test suites for SSH, acceptance, etc.
	* tag tests as slow, flaky, etc.

	Nice to have:

	* JGit build from local tree.
	* coverage

	[[installation]]
	== Installation

	You need to use Java 8 and Node.js for building gerrit.

	You can install Bazel from the bazel.io:
	https://www.bazel.io/versions/master/docs/install.html


	[[build]]
	== Building on the Command Line

	=== Gerrit Development WAR File

	To build the Gerrit web application that includes the GWT UI and the
	PolyGerrit UI:

	----
	bazel build gerrit
	----

	[NOTE]
	PolyGerrit UI may require additional tools (such as npm). Please read
	the polygerrit-ui/README.md for more info.

	The output executable WAR will be placed in:

	----
	bazel-bin/gerrit.war
	----

	[[release]]
	=== Gerrit Release WAR File

	To build the Gerrit web application that includes the GWT UI, the
	PolyGerrit UI and documentation:

	----
	bazel build release
	----

	The output executable WAR will be placed in:

	----
	bazel-bin/release.war
	----

	=== Headless Mode

	To build Gerrit in headless mode, i.e. without the GWT Web UI:

	----
	bazel build headless
	----

	The output executable WAR will be placed in:

	----
	bazel-bin/headless.war
	----

	=== Extension and Plugin API JAR Files

	To build the extension, plugin and GWT API JAR files:

	----
	bazel build api
	----

	The output archive that contains Java binaries, Java sources and
	Java docs will be placed in:

	----
	bazel-genfiles/api.zip
	----

	Install {extension,plugin,gwt}-api to the local maven repository:

	----
	tools/maven/api.sh install
	----

	Install gerrit.war to the local maven repository:

	----
	tools/maven/api.sh war_install
	----

	=== Plugins

	----
	bazel build plugins:core
	----

	The output JAR files for individual plugins will be placed in:

	----
	bazel-genfiles/plugins/<name>/<name>.jar
	----

	The JAR files will also be packaged in:

	----
	bazel-genfiles/plugins/core.zip
	----

	To build a specific plugin:

	----
	bazel build plugins/<name>
	----

	The output JAR file will be be placed in:

	----
	bazel-genfiles/plugins/<name>/<name>.jar
	----

	Note that when building an individual plugin, the `core.zip` package
	is not regenerated.



	[[IDEs]]
	== Using an IDE.

	=== IntelliJ

	The Gerrit build works with Bazel's link:https://ij.bazel.io[IntelliJ plugin].
	Please follow the instructions on <<dev-intellij#,IntelliJ Setup>>.

	=== Eclipse

	==== Generating the Eclipse Project

	Create the Eclipse project:

	----
	tools/eclipse/project.py
	----

	and then follow the link:dev-eclipse.html#setup[setup instructions].

	==== Refreshing the Classpath

	If an updated classpath is needed, the Eclipse project can be
	refreshed and missing dependency JARs can be downloaded by running
	`project.py` again. For IntelliJ, you need to click the `Sync Project
	with BUILD Files` button of link:https://ij.bazel.io[IntelliJ plugin].

	[[documentation]]
	=== Documentation

	To build only the documentation for testing or static hosting:

	----
	bazel build Documentation:searchfree
	----

	The html files will be bundled into `searchfree.zip` in this location:

	----
	bazel-bin/Documentation/searchfree.zip
	----

	To build the executable WAR with the documentation included:

	----
	bazel build withdocs
	----

	The WAR file will be placed in:

	----
	bazel-bin/withdocs.war
	----

	[[tests]]
	== Running Unit Tests

	----
	bazel test --build_tests_only //...
	----

	Debugging tests:

	----
	bazel test --test_output=streamed --test_filter=com.gerrit.TestClass.testMethod testTarget
	----

	Debug test example:

	----
	bazel test --test_output=streamed --test_filter=com.google.gerrit.acceptance.api.change.ChangeIT.getAmbiguous //gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/api/change:api_change
	----

	To run a specific test group, e.g. the rest-account test group:

	----
	bazel test //gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/rest/account:rest_account
	----

	To run the tests against NoteDb backend:

	----
	bazel test --test_env=GERRIT_NOTEDB=READ_WRITE //...
	----

	To run only tests that do not use SSH:

	----
	bazel test --test_env=GERRIT_USE_SSH=NO //...
	----

	== Dependencies

	Dependency JARs are normally downloaded as needed, but you can
	download everything upfront. This is useful to enable
	subsequent builds to run without network access:

	----
	bazel fetch //...
	----

	When downloading from behind a proxy (which is common in some corporate
	environments), it might be necessary to explicitly specify the proxy that
	is then used by `curl`:

	----
	export http_proxy=http://<proxy_user_id>:<proxy_password>@<proxy_server>:<proxy_port>
	----

	Redirection to local mirrors of Maven Central and the Gerrit storage
	bucket is supported by defining specific properties in
	`local.properties`, a file that is not tracked by Git:

	----
	echo download.GERRIT = http://nexus.my-company.com/ >>local.properties
	echo download.MAVEN_CENTRAL = http://nexus.my-company.com/ >>local.properties
	----

	The `local.properties` file may be placed in the root of the gerrit repository
	being built, or in `~/.gerritcodereview/`. The file in the root of the gerrit
	repository has precedence.

	== Building against unpublished Maven JARs

	To build against unpublished Maven JARs, like gwtorm or PrologCafe, the custom
	JARs must be installed in the local Maven repository (`mvn clean install`) and
	`maven_jar()` must be updated to point to the `MAVEN_LOCAL` Maven repository for
	that artifact:

	[source,python]
	----
	maven_jar(
	name = 'gwtorm',
	artifact = 'gwtorm:gwtorm:42',
	repository = MAVEN_LOCAL,
	)
	----

	== Building against artifacts from custom Maven repositories

	To build against custom Maven repositories, two modes of operations are
	supported: with rewrite in local.properties and without.

	Without rewrite the URL of custom Maven repository can be directly passed
	to the maven_jar() function:

	[source,python]
	----
	GERRIT_FORGE = 'http://gerritforge.com/snapshot'

	maven_jar(
	name = 'gitblit',
	artifact = 'com.gitblit:gitblit:1.4.0',
	sha1 = '1b130dbf5578ace37507430a4a523f6594bf34fa',
	repository = GERRIT_FORGE,
	)
	----

	When the custom URL has to be rewritten, then the same logic as with Gerrit
	known Maven repository is used: Repo name must be defined that matches an entry
	in local.properties file:

	----
	download.GERRIT_FORGE = http://my.company.mirror/gerrit-forge
	----

	And corresponding WORKSPACE excerpt:

	[source,python]
	----
	GERRIT_FORGE = 'GERRIT_FORGE:'

	maven_jar(
	name = 'gitblit',
	artifact = 'com.gitblit:gitblit:1.4.0',
	sha1 = '1b130dbf5578ace37507430a4a523f6594bf34fa',
	repository = GERRIT_FORGE,
	)
	----


	[[clean-cache]]
	=== Cleaning The download cache

	The cache for the Gerrit Code Review project is located in
	`~/.gerritcodereview/buck-cache/locally-built-artifacts`.

	If you really do need to clean the cache manually, then:

	----
	rm -rf ~/.gerritcodereview/buck-cache/locally-built-artifacts
	----

	Note that the root `buck-cache` folder should not be deleted as it also contains
	the `downloaded-artifacts` directory, which holds the artifacts that got
	downloaded (not built locally).

	[NOTE] When building with Bazel the artifacts are still cached in
	`~/.gerritcodereview/buck-cache/`. This allows Bazel to make use of
	libraries that were previously downloaded by Buck.

	GERRIT
	------
	Part of link:index.html[Gerrit Code Review]

	SEARCHBOX
	---------