[CMake] Portable revision lookup?

[Oliver kfsone Smith]

Right now I wrap my Linux-based build process with a script that 
features the line

    REVISION=`svn info ${SRC_PATH} | awk '/^Revision/ { print $2 }'`

Which is neither OS or VCS portable.

I'm trying to put together a CPack configuration to make the builds, and 
I'd like to name the resulting installer for the revision it was built from.

Is there any kind of built-in mechanism I can use for this, or would I 
be best just using IFs and executing os-specific commands? (I'm not 
quite sure how I'm going to pluck the info out under Windows)

I'm also wondering if there is a way to query other repository 
attributes - specifically the URL - I'd like to build installers named

<product>.<branch>.<revision>.<suffix>

e.g.

     my-client.baseline.57721.deb
or
     my-server.branches.1.35.57804.tbz2

Any pointers?

- Oliver

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