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From Stefan Sperling <s...@elego.de>
Subject Re: How to implement "selective checkout, merge and build use case"
Date Mon, 15 Jun 2015 07:39:15 GMT
On Mon, Jun 15, 2015 at 06:47:55AM +0000, Peter LitsegÄrd wrote:
> Hi!
> 
> 
> We have a rather complex application with a large number of sourcefiles organized in
folders where one folder-tree corresponds to one module. We're currently using SVN in order
to version control and are looking at ways to use SVN for "selective checkout, merge and build"
of selected modules. Each module has a specific setup of config-, documentation- and make-files
making them "semi autonomous". When I say "semi autonomous" I refer to the fact that every
module relies on one *core module* which provides the base functionality (foundation) needed
by all the other modules.
> 
> 
> The reason why we would like to be able to perform "selective checkout, merge and build"
is that we need to be able to deliver a specific set-up of modules at a given time. That checkout
would result in a checkout of the "core" module together with the other selected modules.
After the checkout has been performed we'd like to be able to perform the following "post
checkout" operations:
> 
> 
> 1. merge the modules config-fragments into a single config-file
> 
> 2. merge the modules doc-fragments (in Latex) into a single doc-file
> 
> 3. execute the modules make-files in order to build them
> 
> 
> Is there a recommended best practice to accomplish this using SVN or are there any complementing
tools which could help us out here?
> 
> 
> Many thanks in advance.

Some people use svn:externals for this kind of thing, which can eventually
turn into a disaster because it doesn't scale and only records relationships
in one direction. You can't easily ask: "Which modules use a particular
module M?" But you can ask "Which modules does module M depend on?"
Since svn:externals use a set of segregated working copies they don't mix
well with 'svn merge' -- you can't atomically merge a change set which
affects multiple modules.
I've seen this approach both succeed and fail. Generally, I guess the more
aware everyone is about the limitations of svn:externals the better it can
be made to work.

If you really need this to scale over time and project size, you should
consider a dependency management tool and leave the version control tool
out of this. Unfortunately these tools tend to be very domain specific.
For the Java world there's Maven, for embedded Linux there are several
native package managers (rpm, deb, etc.), for Dotnet stuff there's NuGet,
on Unix you have Makefiles... The best choice depends on your domain.

It sounds like you're already using make. Have you considered writing a
Makefile which ties things together in a way you need and manages the
dependencies? This may not be the answer you were looking for but it
might keep things simple in the long term. You could take an intense look
at how Linux and *BSD make-based build systems manage to target a wide
variety of platforms from a single source tree to find some inspiration.

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