Setting up the Mercurial Repositories for Sumatra

[John Rose]

OK, I think we've aired out the issues enough to start building repos for Sumatra.

Let's start with sumatra/{sumatra-dev/scratch,sumatra-dev/{hotspot,jdk,langtools,...}}, snapped from jdk8/jdk8 (scratch is empty).

We'll eventually enable branches in it.  (This might take a little longer, to modify the server scripts.)

The scratch repo can be used (or not) to hold patches, if necessary.  It can also hold small standalone experiments (code trees).

We can build the "stable" sumatra/sumatra repo later, when we have some stable stuff to put into it.  

— John

On Dec 7, 2012, at 4:54 PM, John Rose wrote:

> A. We need a stable prototype which can be built using standard procedures.
> B. We need a "sandbox" or "workbench" for maybe-throwaway experiments in modifying the JVM and JDK (not to interfere with A).
> C. We need a part of the "workbench" to share flat files, small proofs of concept, and other ad hoc resources (not to interfere with A or B).
> D. We do not need direct mergability into jdk8 (same as lambda repos, which do not merge up directly, and does not need to pass jcheck).
> E. The workbench version of things needs to be malleable by simultaneous independent workers.
> F. However, workbench experiments should be shareable, when the workers want to collaborate.
> G. Successful, maturing experiments should be shareable with a wider audience, by moving changesets to the stable prototoype (A).
> H. Eventually (as with Project Lambda) the prototype can be moved (after further development) into the main jdk source base (JDK 9 or whichever).
> I. Unlike big projects like HotSpot, Sumatra will not grow very large, and so does not need a high level of codification and formality.
> J. We will (per OpenJDK) distinguish the roles of author, committer, and reviewer.
> 
> In concrete terms, we think this comes to something like the following repositories:
> 
> A. http://hg.openjdk.java.net/sumatra/sumatra/{hotspot,jdk,langtools,...}  (cloned from jdk8, buildable & testable, occasionally refreshed and rebased)
> 
> B. http://hg.openjdk.java.net/sumatra/sumatra-dev/{hotspot,jdk,langtools}  (bundle of independent branches, occasionally rebased on A)
> 
> C. http://hg.openjdk.java.net/sumatra/sumatra-dev/scratch (initially empty workbench shelf, for sharing artifacts other than JDK source changes)
>