Re: Building backwards in time

Stepping into thread to just give my ++ to the actual suggestion.
Feature itself is not that far fetched since other build tools have
this kind of ability. Buildbot ( http://buildbot.net/trac ) comes to
mind first (if i remember correctly)

Few pro's for such feature:
- saved diskspace for not requiring to store the artfifacts for
extended period of times.
- error verifications, for example: sometimes builds just fail with no
apparent reason, later on it would require manual work make that
certain build to happen.
- say, i've added some new build steps to the builder composite chain:
Example say, i've just found out a some static analyzer and i want to
do compare the old versions already being build to the head of a
trunk.
- I know this is a poor pro item but i'll mention it anyway: CC
already has this kind of feature, kinda ;)   One can rebuild the
latest head anyway, over and over and over again - just be clicking
the "build" button.
- just because its a nice feature =)

>From user's perspective, i'd see it implemented something like this:
Each time scm plugin notices there's changes, get that exact commit id
stored and store that into the logfiles that cc generates. When user
is viewing the log of the old build, there's a "rebuild" button
somewhere and triggering the rebuild would pass the commit id to the
scm plugin which would checkout the source with that id and rest of
the build phases are executed as normally..

Obviously something needs to be decided on matter of build index
incrementing if user has requested a rebuild. And how logfiles's
possible differences affect each other.

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