How can i insert binary version info into cc_binary

[sp...@mobvoi.com]

Hi all ,

as we use blade before , which offer some utilities to setup binary version for all cc_binary targets. So for all binaries , wo can use "--version" to see binary version info, (build time, build host name, build user, svn or git version info, debug or release etc... )
will it be supported in bazel in the near future? Or is it possible to implement this feature in an extension? If Yes, what should i do then?

thanks

Shunping Ye

[Alex Humesky]

One way to do this is to use make variable substitution + genrule + --define:

genrule(
  name = "gen_my_binary_version",
  outs = ["my_binary_version.txt"],
  cmd = "echo $(my_binary_version) > $@")

*_binary(
  name = "my_binary",
  ...
  data = [":my_binary_version.txt"])

Then:

bazel build :my_binary --define my_binary_version=1.2.3.4

Note that the build will fail if "--define my_binary_version=..." is not specified on the command line.

You could also generate source and include that in your srcs:

genrule(
  name = "gen_my_binary_version",
  outs = ["BuildInfo.java"],
  cmd = """

cat > $@ <<EOF
package my.binary.package;
public class BuildInfo {
  public static final String VERSION = "$(my_binary_version)";
}EOF

""")

java_binary(
  name = "my_binary",
  srcs = [..., ":BuildInfo.java"],
   ...)

There's also --stamp:
http://bazel.io/docs/bazel-user-manual.html (search for --stamp)
http://bazel.io/docs/be/java.html#java_binary.stamp

But I'm not sure if there is an easy mechanism to customize that.

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[Kristina Chodorow]

--stamp is probably your best bet, check out the --workspace_state_command test (https://github.com/bazelbuild/bazel/blob/master/src/test/shell/bazel/bazel_workspace_status_test.sh#L73-L115) which I think does what you want.

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[sp...@mobvoi.com]

thank you very much , I will implement it using your suggestion.