Simplify local JGit development

Put all the logic in jgit.bzl, where a single edit suffices to get
the local flavor.

Given that all sha1 for jgit dependencies are in jgit.bzl, we can
remove the constants and use sha1 values directly.

Change-Id: Icabf651e02f226e5c025457d54588074a11ae283

Documentation/dev-bazel.txt

@@ -354,14 +354,9 @@ And corresponding WORKSPACE excerpt:
 
 [[consume-jgit-from-development-tree]]
 
-To consume the JGit dependency from the development tree, uncomment
-`local_repository` rule for `jgit` in WORKSPACE file and uncomment
-the lines in the `lib/jgit/**/BUILD` files for `jgit` rule aliases.
-`jgit-dev=1` must be passed in to bazel:
-
-----
-  $ bazel test --define jgit-dev=1 ...
-----
+To consume the JGit dependency from the development tree, edit
+`lib/jgit/jgit.bzl` setting LOCAL_JGIT_REPO to a directory holding a
+JGit repository.
 
 [[clean-cache]]
 === Cleaning The download cache

WORKSPACE

@@ -130,34 +130,9 @@ maven_jar(
     sha1 = "cdb2dcb4e22b83d6b32b93095f644c3462739e82",
 )
 
-load("//lib/jgit:jgit.bzl", "JGIT_VERS", "JGIT_REPO", "JGIT_SHA1", "JGIT_SRC_SHA1", "JGIT_SERVLET_SHA1", "JGIT_ARCHIVE_SHA1", "JGIT_JUNIT_SHA1")
+load("//lib/jgit:jgit.bzl", "jgit_repos")
 
-#
-# Uncomment jgit repository to route JGit dependency to development tree.
-# Pass jgit-dev=1 in to bazel: `bazel test --define jgit-dev=1 ...`
-# Due to: https://github.com/bazelbuild/bazel/issues/2707
-# aliases to jgit should be uncommented in lib/jgit/**/BUILD files.
-#local_repository(
-#    name = "jgit",
-#    path = "/home/<user>/projects/jgit",
-#)
-
-maven_jar(
-    name = "jgit_lib",
-    artifact = "org.eclipse.jgit:org.eclipse.jgit:" + JGIT_VERS,
-    repository = JGIT_REPO,
-    sha1 = JGIT_SHA1,
-    src_sha1 = JGIT_SRC_SHA1,
-    unsign = True,
-)
-
-maven_jar(
-    name = "jgit_servlet",
-    artifact = "org.eclipse.jgit:org.eclipse.jgit.http.server:" + JGIT_VERS,
-    repository = JGIT_REPO,
-    sha1 = JGIT_SERVLET_SHA1,
-    unsign = True,
-)
+jgit_repos()
 
 maven_jar(
     name = "javaewah",
@@ -166,21 +141,6 @@ maven_jar(
     sha1 = "94ad16d728b374d65bd897625f3fbb3da223a2b6",
 )
 
-maven_jar(
-    name = "jgit_archive",
-    artifact = "org.eclipse.jgit:org.eclipse.jgit.archive:" + JGIT_VERS,
-    repository = JGIT_REPO,
-    sha1 = JGIT_ARCHIVE_SHA1,
-)
-
-maven_jar(
-    name = "jgit_junit",
-    artifact = "org.eclipse.jgit:org.eclipse.jgit.junit:" + JGIT_VERS,
-    repository = JGIT_REPO,
-    sha1 = JGIT_JUNIT_SHA1,
-    unsign = True,
-)
-
 maven_jar(
     name = "gwtjsonrpc",
     artifact = "com.google.gerrit:gwtjsonrpc:1.11",

lib/jgit/BUILD

@@ -1,7 +0,0 @@
-config_setting(
-    name = "dev",
-    values = {
-        "define": "jgit-dev=1",
-    },
-    visibility = ["//visibility:public"],
-)

lib/jgit/jgit.bzl

@@ -1,19 +1,66 @@
-load("//tools/bzl:maven_jar.bzl", "GERRIT", "MAVEN_LOCAL", "MAVEN_CENTRAL")
+load("//tools/bzl:maven_jar.bzl", "GERRIT", "MAVEN_LOCAL", "MAVEN_CENTRAL", "maven_jar")
 
-JGIT_VERS = "4.6.0.201612231935-r.30-gd3148f300"
+_JGIT_VERS = "4.6.0.201612231935-r.30-gd3148f300"
 
-DOC_VERS = "4.6.0.201612231935-r" # Set to JGIT_VERS unless using a snapshot
+_DOC_VERS = "4.6.0.201612231935-r" # Set to _JGIT_VERS unless using a snapshot
 
-JGIT_DOC_URL = "http://download.eclipse.org/jgit/site/" + DOC_VERS + "/apidocs"
+JGIT_DOC_URL = "http://download.eclipse.org/jgit/site/" + _DOC_VERS + "/apidocs"
 
-JGIT_REPO = GERRIT # Leave here even if set to MAVEN_CENTRAL.
+_JGIT_REPO = GERRIT # Leave here even if set to MAVEN_CENTRAL.
 
-JGIT_SHA1 = "a2b5970b853f8fee64589fc1103c0ceb7677ba63"
+# set this to use a local version.
+# "/home/<user>/projects/jgit"
+LOCAL_JGIT_REPO = ""
 
-JGIT_SRC_SHA1 = "765f955774c36c226aa41fba7c20119451de2db7"
+def jgit_repos():
+  if LOCAL_JGIT_REPO:
+    native.local_repository(
+        name = "jgit",
+        path = LOCAL_JGIT_REPO,
+    )
+  else:
+    jgit_maven_repos()
 
-JGIT_SERVLET_SHA1 = "d3aa54bd610db9a5c246aa8fef13989982c98628"
+def jgit_maven_repos():
+    maven_jar(
+        name = "jgit_lib",
+        artifact = "org.eclipse.jgit:org.eclipse.jgit:" + _JGIT_VERS,
+        repository = _JGIT_REPO,
+        sha1 = "a2b5970b853f8fee64589fc1103c0ceb7677ba63",
+        src_sha1 = "765f955774c36c226aa41fba7c20119451de2db7",
+        unsign = True,
+    )
+    maven_jar(
+        name = "jgit_servlet",
+        artifact = "org.eclipse.jgit:org.eclipse.jgit.http.server:" + _JGIT_VERS,
+        repository = _JGIT_REPO,
+        sha1 = "d3aa54bd610db9a5c246aa8fef13989982c98628",
+        unsign = True,
+    )
+    maven_jar(
+        name = "jgit_archive",
+        artifact = "org.eclipse.jgit:org.eclipse.jgit.archive:" + _JGIT_VERS,
+        repository = _JGIT_REPO,
+        sha1 = "a728cf277396f1227c5a8dffcf5dee0188fc0821",
+    )
+    maven_jar(
+        name = "jgit_junit",
+        artifact = "org.eclipse.jgit:org.eclipse.jgit.junit:" + _JGIT_VERS,
+        repository = _JGIT_REPO,
+        sha1 = "6c2b2f192c95d25a2e1576aee5d1169dd8bd2266",
+        unsign = True,
+    )
 
-JGIT_ARCHIVE_SHA1 = "a728cf277396f1227c5a8dffcf5dee0188fc0821"
+def jgit_dep(name):
+  mapping = {
+      "@jgit_junit//jar": "@jgit//org.eclipse.jgit.junit:junit",
+      "@jgit_lib//jar:src": "@jgit//org.eclipse.jgit:libjgit-src.jar",
+      "@jgit_lib//jar": "@jgit//org.eclipse.jgit:jgit",
+      "@jgit_servlet//jar":"@jgit//org.eclipse.jgit.http.server:jgit-servlet",
+      "@jgit_archive//jar": "@jgit//org.eclipse.jgit.archive:jgit-archive",
+  }
 
-JGIT_JUNIT_SHA1 = "6c2b2f192c95d25a2e1576aee5d1169dd8bd2266"
+  if LOCAL_JGIT_REPO:
+    return mapping[name]
+  else:
+    return name

lib/jgit/org.eclipse.jgit.archive/BUILD

@@ -1,10 +1,9 @@
+load("//lib/jgit:jgit.bzl", "jgit_dep")
+
 java_library(
     name = "jgit-archive",
     data = ["//lib:LICENSE-jgit"],
     visibility = ["//visibility:public"],
-    exports = select({
-        # "//lib/jgit:dev": ["@jgit//org.eclipse.jgit.archive:jgit-archive"],
-        "//conditions:default": ["@jgit_archive//jar"],
-    }),
+    exports = [jgit_dep("@jgit_archive//jar")],
     runtime_deps = ["//lib/jgit/org.eclipse.jgit:jgit"],
 )

lib/jgit/org.eclipse.jgit.http.server/BUILD

@@ -1,10 +1,9 @@
+load("//lib/jgit:jgit.bzl", "jgit_dep")
+
 java_library(
     name = "jgit-servlet",
     data = ["//lib:LICENSE-jgit"],
     visibility = ["//visibility:public"],
-    exports = select({
-        # "//lib/jgit:dev": ["@jgit//org.eclipse.jgit.http.server:jgit-servlet"],
-        "//conditions:default": ["@jgit_servlet//jar"],
-    }),
+    exports = [jgit_dep("@jgit_servlet//jar")],
     runtime_deps = ["//lib/jgit/org.eclipse.jgit:jgit"],
 )

lib/jgit/org.eclipse.jgit.junit/BUILD

@@ -1,11 +1,10 @@
+load("//lib/jgit:jgit.bzl", "jgit_dep")
+
 java_library(
     name = "junit",
     testonly = 1,
     data = ["//lib:LICENSE-DO_NOT_DISTRIBUTE"],
     visibility = ["//visibility:public"],
-    exports = select({
-        # "//lib/jgit:dev": ["@jgit//org.eclipse.jgit.junit:junit"],
-        "//conditions:default": ["@jgit_junit//jar"],
-    }),
+    exports = [jgit_dep("@jgit_junit//jar")],
     runtime_deps = ["//lib/jgit/org.eclipse.jgit:jgit"],
 )

lib/jgit/org.eclipse.jgit/BUILD

@@ -1,20 +1,16 @@
+load("//lib/jgit:jgit.bzl", "jgit_dep")
+
 java_library(
     name = "jgit",
     data = ["//lib:LICENSE-jgit"],
     visibility = ["//visibility:public"],
-    exports = select({
-        # "//lib/jgit:dev": ["@jgit//org.eclipse.jgit:jgit"],
-        "//conditions:default": ["@jgit_lib//jar"],
-    }),
+    exports = [jgit_dep("@jgit_lib//jar")],
     runtime_deps = [":javaewah"],
 )
 
 alias(
     name = "jgit-source",
-    actual = select({
-        # "//lib/jgit:dev": "@jgit//org.eclipse.jgit:libjgit-src.jar",
-        "//conditions:default": "@jgit_lib//jar:src",
-    }),
+    actual = jgit_dep("@jgit_lib//jar:src"),
     visibility = ["//visibility:public"],
 )