Keeping common files in trunk and branch identical

I would like to have a branch for a different variant of our software.  In the branch, some of the files will be changed.  The other files I would like to keep identical between trunk and the branch.  That is, I would like to avoid the parallel maintenance of the same file in the trunk and the branch.  Are there any "magical" tricks I can do to keep some files more or less automatically synchronized and identical between the trunk and the branch?

Basically, what I think I need is some kind of "overlay" mechanism, where a branch would take it's files from the trunk, _unless_ they have been changed in the branch.  And where a change applied to the trunk would also take effect in the branch.  That is, the branch would, for files that have not been changed in the branch, just follow the trunk.  Is anything like this possible?

(It seems to me that Aegis may have some form of "inheritance" between branches, where a change that is needed in more than one branch may be applied to their common ancestor.  Something like that might be similar to what I need.)

With kind regards
Asbjørn Sæbø

                                               
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Received on 2009-11-26 15:13:19 CET