Implement Buck driven build

Today there are plenty of modern build tool systems available in the
wild (in no particular order):

* http://bazel.io
* https://pantsbuild.github.io
* http://shakebuild.com
* https://ninja-build.org
* https://buckbuild.com

The attributes, that all these build tools have in common, are:

* reliable
* correct
* very fast
* reproducible

It must not always be the other build tool, this project is currently
using. Or, quoting Gerrit Code Review maintainer here:

  "Friends, don't let friends use <the other build tool system>!"

This change is non-complete implementation of JGit build in Buck,
needed by Gerrit Code Review to replace its dependency with standlone
JGit cell. This is very useful when a developer is working on both
projects and is trying to integrate changes made in JGit in Gerrit.

The supported workflow is:

  $ cd jgit
  $ emacs <hack>
  $ cd ../gerrit
  $ buck build --config repositories.jgit=../jgit gerrit

With --config repositories.jgit=../jgit jgit cell is routed through
JGit development tree.

To build jgit, issue:

  $ buck build //:jgit
  [-] PROCESSING BUCK FILES...FINISHED 0,0s

Yes, you can't measure no-op build time, given that Buck daemon is
used.

Change-Id: I301a71b19fba35a5093d8cc64d4ba970c2877a44
Signed-off-by: David Ostrovsky <david@ostrovsky.org>

.buckconfig

@@ -0,0 +1,15 @@
+[buildfile]
+  includes = //tools/default.defs
+
+[java]
+  src_roots = src, resources
+
+[project]
+  ignore = .git
+
+[cache]
+  mode = dir
+
+[download]
+  maven_repo = http://repo1.maven.org/maven2
+  in_build = true

.gitignore

@@ -1,2 +1,4 @@
 /target
 /.project
+/buck-cache
+/buck-out

BUCK

@@ -0,0 +1,38 @@
+java_library(
+  name = 'jgit',
+  exported_deps = ['//org.eclipse.jgit:jgit'],
+  visibility = ['PUBLIC'],
+)
+
+java_library(
+  name = 'jgit_src',
+  exported_deps = ['//org.eclipse.jgit:jgit_src'],
+  visibility = ['PUBLIC'],
+)
+
+java_library(
+  name = 'jgit-servlet',
+  exported_deps = [
+    ':jgit',
+    '//org.eclipse.jgit.http.server:jgit-servlet'
+  ],
+  visibility = ['PUBLIC'],
+)
+
+java_library(
+  name = 'jgit-archive',
+  exported_deps = [
+    ':jgit',
+    '//org.eclipse.jgit.archive:jgit-archive'
+  ],
+  visibility = ['PUBLIC'],
+)
+
+java_library(
+  name = 'junit',
+  exported_deps = [
+    ':jgit',
+    '//org.eclipse.jgit.junit:junit'
+  ],
+  visibility = ['PUBLIC'],
+)

lib/BUCK

@@ -0,0 +1,62 @@
+maven_jar(
+  name = 'jsch',
+  bin_sha1 = '658b682d5c817b27ae795637dfec047c63d29935',
+  src_sha1 = '791359d94d6edcace686a56d0727ee093a2f7c33',
+  group = 'com.jcraft',
+  artifact = 'jsch',
+  version = '0.1.53',
+)
+
+maven_jar(
+  name = 'javaewah',
+  bin_sha1 = 'eceaf316a8faf0e794296ebe158ae110c7d72a5a',
+  src_sha1 = 'a50d78eb630e05439461f3130b94b3bcd1ea6f03',
+  group = 'com.googlecode.javaewah',
+  artifact = 'JavaEWAH',
+  version = '0.7.9',
+)
+
+maven_jar(
+  name = 'httpcomponents',
+  bin_sha1 = '4c47155e3e6c9a41a28db36680b828ced53b8af4',
+  src_sha1 = 'af4d76be0c46ee26b0d9d1d4a34d244a633cac84',
+  group = 'org.apache.httpcomponents',
+  artifact = 'httpclient',
+  version = '4.3.6',
+)
+
+maven_jar(
+  name = 'slf4j-api',
+  bin_sha1 = '0081d61b7f33ebeab314e07de0cc596f8e858d97',
+  src_sha1 = '58d38f68d4a867d4552ae27960bb348d7eaa1297',
+  group = 'org.slf4j',
+  artifact = 'slf4j-api',
+  version = '1.7.2',
+)
+
+maven_jar(
+  name = 'servlet-api',
+  bin_sha1 = '3cd63d075497751784b2fa84be59432f4905bf7c',
+  src_sha1 = 'ab3976d4574c48d22dc1abf6a9e8bd0fdf928223',
+  group = 'javax.servlet',
+  artifact = 'javax.servlet-api',
+  version = '3.1.0',
+)
+
+maven_jar(
+  name = 'commons-compress',
+  bin_sha1 = 'c7d9b580aff9e9f1998361f16578e63e5c064699',
+  src_sha1 = '396b81bdfd0fb617178e1707ef64832215307c78',
+  group = 'org.apache.commons',
+  artifact = 'commons-compress',
+  version = '1.6',
+)
+
+maven_jar(
+  name = 'junit',
+  bin_sha1 = '4e031bb61df09069aeb2bffb4019e7a5034a4ee0',
+  src_sha1 = '28e0ad201304e4a4abf999ca0570b7cffc352c3c',
+  group = 'junit',
+  artifact = 'junit',
+  version = '4.11',
+)

org.eclipse.jgit.archive/BUCK

@@ -0,0 +1,13 @@
+java_library(
+  name = 'jgit-archive',
+  srcs = glob(
+    ['src/**'],
+    excludes = ['src/org/eclipse/jgit/archive/FormatActivator.java'],
+  ),
+  resources = glob(['resources/**']),
+  provided_deps = [
+    '//org.eclipse.jgit:jgit',
+    '//lib:commons-compress',
+  ],
+  visibility = ['PUBLIC'],
+)

org.eclipse.jgit.http.server/BUCK

@@ -0,0 +1,10 @@
+java_library(
+  name = 'jgit-servlet',
+  srcs = glob(['src/**']),
+  resources = glob(['resources/**']),
+  provided_deps = [
+    '//org.eclipse.jgit:jgit',
+    '//lib:servlet-api',
+  ],
+  visibility = ['PUBLIC'],
+)

org.eclipse.jgit.junit/BUCK

@@ -0,0 +1,10 @@
+java_library(
+  name = 'junit',
+  srcs = glob(['src/**']),
+  resources = glob(['resources/**']),
+  provided_deps = [
+    '//org.eclipse.jgit:jgit',
+    '//lib:junit',
+  ],
+  visibility = ['PUBLIC'],
+)

org.eclipse.jgit/BUCK

@@ -0,0 +1,20 @@
+SRCS = glob(['src/**'])
+RESOURCES = glob(['resources/**'])
+
+java_library(
+  name = 'jgit',
+  srcs = SRCS,
+  resources = RESOURCES,
+  deps = [
+    '//lib:javaewah',
+    '//lib:jsch',
+    '//lib:httpcomponents',
+    '//lib:slf4j-api',
+  ],
+  visibility = ['PUBLIC'],
+)
+
+java_sources(
+  name = 'jgit_src',
+  srcs = SRCS + RESOURCES,
+)

tools/default.defs

@@ -0,0 +1,42 @@
+def java_sources(
+    name,
+    srcs,
+    visibility = ['PUBLIC']
+  ):
+  java_library(
+    name = name,
+    resources = srcs,
+    visibility = visibility,
+  )
+
+def maven_jar(
+    name,
+    group,
+    artifact,
+    version,
+    bin_sha1,
+    src_sha1,
+    visibility = ['PUBLIC']):
+  jar_name = '%s__jar' % name
+  src_name = '%s__src' % name
+
+  remote_file(
+    name = jar_name,
+    sha1 = bin_sha1,
+    url = 'mvn:%s:%s:jar:%s' % (group, artifact, version),
+    out = '%s.jar' % jar_name,
+  )
+
+  remote_file(
+    name = src_name,
+    sha1 = src_sha1,
+    url = 'mvn:%s:%s:src:%s' % (group, artifact, version),
+    out = '%s.jar' % src_name,
+  )
+
+  prebuilt_jar(
+    name = name,
+    binary_jar = ':' + jar_name,
+    source_jar = ':' + src_name,
+    visibility = visibility)
+