commit 151095d1039bafaf505802f511838dbc58a28d2d
author Todd Wang <toddw@google.com> Mon May 04 18:30:25 2015 -0700
committer Todd Wang <toddw@google.com> Mon May 04 18:30:27 2015 -0700
tree 605dea5e1c7a55ae3a38fcb88ebd657eea72c6b1
parent 2073489eb35ddace1a458bf10347f2b116ad49ef

lib: Add -v23.metadata, which dumps metadata for the binary.

The metadata package is a map from string ids to string values,
and provides a mechanism to set the ldflags on the go toolchain
to get metadata linked into your binary during build time.  It
also provides utilities to insert more metadata in package init
functions, and to convert into XML and base64.

Every binary built with the metadata package will now
automatically get a flag -v23.metadata, which dumps the metadata
for the program binary in XML.

The format looks like this:

<metadata>
<md id="build.Manifest"><![CDATA[
<manifest label="">
<imports></imports>
<projects>
<project exclude="false" name="release.go.v23"...
...
</projects>
<tools></tools>
</manifest>
]]></md>
<md id="build.Platform">amd64unknown-linux-unknown</md>
<md id="build.Pristine">false</md>
<md id="build.Time">2015-05-04T08:40:22Z</md>
<md id="build.User">Todd Wang</md>
<md id="go.Arch">amd64</md>
<md id="go.OS">linux</md>
<md id="go.Version">go1.4.1</md>
<md id="v23.RPCEndpointVersion">5</md>
<md id="v23.RPCVersionMax">10</md>
<md id="v23.RPCVersionMin">9</md>
</metadata>

This addresses one part of vanadium/issues#407

MultiPart: 2/3

Change-Id: I234a1dee1221dcda8bc7cfb445a6f53c14857777