Bazel: Produce headless war

This change creates the archive with:

lib
pgm-lib
default web assets

but without:

GWT UI
PolyGerrit UI
Plugins
Documentation

TEST PLAN:

  bazel build :headless
  java -jar bazel-bin/headless.war init -d ../test_site_bazel

Change-Id: I53987b10a5863aee0298bd2ea29405c26dbacb0c

BUILD

@@ -1,4 +1,5 @@
 load('//tools/bzl:genrule2.bzl', 'genrule2')
+load('//tools/bzl:pkg_war.bzl', 'pkg_war')
 
 genrule2(
   name = 'version',
@@ -7,3 +8,21 @@ genrule2(
   out = 'version.txt',
   visibility = ['//visibility:public'],
 )
+
+pkg_war(
+  name = 'headless',
+  context = [
+    '//gerrit-main:main_bin_deploy.jar',
+    '//gerrit-war:webapp_assets',
+  ],
+  libs = [
+    '//gerrit-war:init',
+    '//gerrit-war:log4j-config',
+    '//gerrit-war:version',
+    '//lib:postgresql',
+    '//lib/log:impl_log4j',
+  ],
+  pgmlibs = [
+    '//gerrit-pgm:pgm'
+  ],
+)

WORKSPACE

@@ -716,3 +716,9 @@ maven_jar(
   artifact = 'xerces:xercesImpl:2.8.1',
   sha1 = '25101e37ec0c907db6f0612cbf106ee519c1aef1',
 )
+
+maven_jar(
+  name = 'postgresql',
+  artifact = 'postgresql:postgresql:9.1-901-1.jdbc4',
+  sha1 = '9bfabe48876ec38f6cbaa6931bad05c64a9ea942',
+)

lib/BUILD

@@ -231,3 +231,9 @@ java_library(
   exports = [ '@icu4j//jar' ],
   visibility = ['//visibility:public'],
 )
+
+java_library(
+  name = 'postgresql',
+  exports = ['@postgresql//jar'],
+  visibility = ['//visibility:public'],
+)

tools/bzl/pkg_war.bzl

@@ -0,0 +1,113 @@
+# Copyright (C) 2016 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# War packaging.
+
+jar_filetype = FileType(['.jar'])
+
+def _add_context(in_file, output):
+  input_path = in_file.path
+  return [
+    'unzip -qd %s %s' % (output, input_path)
+  ]
+
+def _add_file(in_file, output):
+  output_path = output
+  input_path = in_file.path
+  short_path = in_file.short_path
+  n = in_file.basename
+
+  # TODO(davido): Drop this when provided_deps added to java_library
+  if n.find('-jdk15on-') != -1:
+    return []
+
+  if short_path.startswith('gerrit-'):
+    n = short_path.split('/')[0] + '-' + n
+
+  output_path += n
+  return [
+    'test -L %s || ln -s $(pwd)/%s %s' % (output_path, input_path, output_path)
+  ]
+
+def _make_war(input_dir, output):
+  return ''.join([
+    '(root=$(pwd) && ',
+    'cd %s && ' % input_dir,
+    'zip -9qr ${root}/%s .)' % (output.path),
+  ])
+
+def _war_impl(ctx):
+  war = ctx.outputs.war
+  build_output = war.path + '.build_output'
+  inputs = []
+
+  # Create war layout
+  cmd = [
+    'set -e;rm -rf ' + build_output,
+    'mkdir -p ' + build_output,
+    'mkdir -p %s/WEB-INF/lib' % build_output,
+    'mkdir -p %s/WEB-INF/pgm-lib' % build_output,
+  ]
+
+  # Add lib
+  transitive_lib_deps = set()
+  for l in ctx.attr.libs:
+    transitive_lib_deps += l.java.transitive_runtime_deps
+
+  for dep in transitive_lib_deps:
+    cmd += _add_file(dep, build_output + '/WEB-INF/lib/')
+    inputs.append(dep)
+
+  # Add pgm lib
+  transitive_pgmlib_deps = set()
+  for l in ctx.attr.pgmlibs:
+    transitive_pgmlib_deps += l.java.transitive_runtime_deps
+
+  for dep in transitive_pgmlib_deps:
+    if dep not in inputs:
+      cmd += _add_file(dep, build_output + '/WEB-INF/pgm-lib/')
+      inputs.append(dep)
+
+  # Add context
+  transitive_context_deps = set()
+  if ctx.attr.context:
+    for jar in ctx.attr.context:
+      if hasattr(jar, 'java'):
+        transitive_context_deps += jar.java.transitive_runtime_deps
+      elif hasattr(jar, 'files'):
+        transitive_context_deps += jar.files
+  for dep in transitive_context_deps:
+    cmd += _add_context(dep, build_output)
+    inputs.append(dep)
+
+  # Add zip war
+  cmd.append(_make_war(build_output, war))
+
+  ctx.action(
+    inputs = inputs,
+    outputs = [war],
+    mnemonic = 'WAR',
+    command = '\n'.join(cmd),
+    use_default_shell_env = True,
+  )
+
+pkg_war = rule(
+  attrs = {
+    'context': attr.label_list(allow_files = True),
+    'libs': attr.label_list(allow_files = jar_filetype),
+    'pgmlibs': attr.label_list(allow_files = False),
+  },
+  implementation = _war_impl,
+  outputs = {'war' : '%{name}.war'},
+)