bazel: generate the classpath in a file, for use with eclipse.

Change-Id: I6562c045a7e47c6661889d63f3103e1aeef113ec

gerrit-httpd/BUILD

@@ -1,3 +1,7 @@
+package(
+  default_visibility=["//visibility:public"]
+)
+
 load('//tools/bzl:junit.bzl', 'junit_tests')
 
 SRCS = glob(

gerrit-reviewdb/BUILD

@@ -1,3 +1,7 @@
+package(
+  default_visibility=["//visibility:public"]
+)
+
 load('//tools/bzl:gwt.bzl', 'gwt_module')
 load('//tools/bzl:junit.bzl', 'junit_tests')
 

tools/bzl/classpath.bzl

@@ -0,0 +1,19 @@
+
+def _classpath_collector(ctx):
+    all = set()
+    for d in ctx.attr.deps:
+        all += d.java.compilation_info.runtime_classpath
+
+    as_strs = [c.path for c in all]
+    ctx.file_action(output= ctx.outputs.runtime,
+                    content="\n".join(sorted(as_strs)))
+
+
+classpath_collector = rule(
+    implementation = _classpath_collector,
+    attrs = {
+        "deps": attr.label_list(),
+    },
+    outputs={
+        "runtime": "%{name}.runtime_classpath"
+    })

tools/bzl/maven_jar.bzl

@@ -94,7 +94,7 @@ def _maven_jar_impl(ctx):
   out = ctx.execute(args)
 
   if out.return_code:
-    fail("failed %s: %s" % (args, out.stderr))
+    fail("failed %s: %s" % (' '.join(args), out.stderr))
   _generate_build_file(ctx, "jar", binjar)
 
   if ctx.attr.src_sha1 or ctx.attr.attach_source: