Revert "bazel: generate the workspace version from the volatile status."

Bazel 0.3.2 introduced regression: [1] workspace_status_command seems to
be ignored. That broke Bazel build. Revert this change and re-consider to
re-apply it, when the problem is fixed upstream.

* [1] https://github.com/bazelbuild/bazel/issues/1976

This reverts commit 214171ddda.

Change-Id: I729ffaf6ae1bff5fb858d78de2a6915058c9e651

.bazelrc

@@ -1 +1 @@
-build --workspace_status_command=./tools/workspace-status.sh --strategy=Javac=worker
+build --strategy=Javac=worker

BUILD

@@ -1,10 +1,11 @@
+load('//tools/bzl:genrule2.bzl', 'genrule2')
 load('//tools/bzl:pkg_war.bzl', 'pkg_war')
 
-genrule(
-  name = 'gen_version',
-  stamp = 1,
-  cmd = "grep STABLE_BUILD_GERRIT_LABEL < bazel-out/volatile-status.txt | cut -d ' ' -f 2 > $@",
-  outs = ['version.txt'],
+genrule2(
+  name = 'version',
+  srcs = ['VERSION'],
+  cmd = "grep GERRIT_VERSION $< | cut -d \"'\" -f 2 >$@",
+  out = 'version.txt',
   visibility = ['//visibility:public'],
 )
 

gerrit-war/BUILD

@@ -63,9 +63,9 @@ genrule2(
   cmd = ' && '.join([
     'cd $$TMP',
     'mkdir -p com/google/gerrit/common',
-    'cat $$ROOT/$(location //:version.txt) >com/google/gerrit/common/Version',
+    'cat $$ROOT/$(location //:version) >com/google/gerrit/common/Version',
     'zip -9Dqr $$ROOT/$@ .',
   ]),
-  tools = ['//:version.txt'],
+  tools = ['//:version'],
   out = 'gen_version.jar',
 )

tools/workspace-status.sh

@@ -1,15 +0,0 @@
-#!/bin/sh
-
-# This script will be run by bazel when the build process starts to
-# generate key-value information that represents the status of the
-# workspace. The output should be like
-#
-# KEY1 VALUE1
-# KEY2 VALUE2
-#
-# If the script exits with non-zero code, it's considered as a failure
-# and the output will be discarded.
-
-git_rev=$(git describe --always --match "v[0-9].*" --dirty)
-
-echo "STABLE_BUILD_GERRIT_LABEL ${git_rev}"