Resent this to the list - too much haste, not enough speed.
Sorry about the duplicate, Ben.
On 2001-08-02 15:35:40 Ben Collins-Sussman wrote:
>Yoshiki Hayashi <yoshiki@xemacs.org> writes:
>
>> <peter.westlake@arm.com> writes:
>>
>> > I think we may be talking at cross-purposes. What I mean is that
>> > if we have two programs foo and bar that both use a library lib,
>> > and I check out foo, giving me:
>> >
>> > foo/foo.c
>> > foo/lib/lib.c
>> >
>> > and I edit foo/lib/lib.c and check it in,
>> > you should then be able to check out bar and get
>> >
>> > bar/bar.c
>> > bar/lib/lib.c
>> >
>> > with my changes to lib.c. I haven't seen anything in the
>> > Subversion documentation to suggest that this can be done.
>>
>> If this is the goal, I think this can be implemented easily
>> by adding 'link' node kind to subversion filesystem.
>
>Yoshiki is right. We do intend to support symbolic links in the
>filesystem someday. It seems like this is all we'd need.
It certainly gets you a long way. There are a number of pitfalls
to avoid: for instance, if the above is implemented as
foo/foo.c
foo/"link to lib"
then if you check out revision R of foo, a simple minded implementation
would give you the latest version of lib. If lib was edited, checking out
revision R of foo would give you an updated lib. Getting different results
from two different checkouts of the same revision is clearly a bad thing.
Specifying the revision of lib in the link avoids the problem, but then
you only have what I called "static" sub-modules. Checking out revision
S > R of foo would still get you the old lib. Sometimes this is what you
want, and sometimes it isn't. I fully intend to come up with a scheme that
supports both functions, and also allows the distinction between the case
where branching foo causes lib to branch, and the case where it doesn't.
Peter.
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Received on Sat Oct 21 14:36:34 2006