Repository? -- How many lines of development?

[Joseph D. Darcy]

Hi John,

On 11/28/2016 3:51 PM, John Coomes wrote:
> On Mon, Nov 28, 2016 at 2:07 PM, Joseph D. Darcy <joe.darcy at oracle.com 
> <mailto:joe.darcy at oracle.com>> wrote:
>
>
>

[snip]

>     In a nutshell, the proposal is to replace tracking the known-good
>     state in 9 via integrate dev -> master, tag in master, pull down
>     to dev process today with just "tag known good in combined
>     dev/master" in 10.
>
>
> Hi Joe,
>
> This would make cloning or pulling the "last known good" state more 
> difficult.  In jdk9, I can always clone/pull from a fixed location 
> (http://.../jdk9/jdk9).  With the proposal, I would have to first 
> clone/pull everything, then examine the tags and sort them (which 
> programatically means decoding release and build numbers, ugh), find 
> the right tag, then pull/update to get the working dir in the right state.
>
> Since my clone would have all the changesets, including those beyond 
> the "last known good" state, it also makes the use of 'tip' and 
> 'default' error prone.  If I do some archaeology and run "hg update 
> <some_older_rev>", then when I'm done, I can't go back to "last known 
> good" with a simple "hg update default".  I have to look at the tags 
> again, sort them, and so on.
>
> I think it's more important that cloning or pulling the "last known 
> good" state be simple, rather than promoting a build.
>
> Mercurial bookmarks might be a compromise solution - you can have a 
> bookmark with a fixed name (e.g., "stable", "jdk10-stable", 
> "last-promoted", whatever) that is updated each time a build is 
> promoted. With validation from jcheck, it could be made reasonably safe.
>

I don't object to having a convenient way to get the last known good 
state of the sources, but I think the way we do this in 9, using a 
separate 700 MB+ Hg forest, has too much overhead to store a relative 
paucity of information.

In terms of evaluating alternatives, are there other ways you see to 
record this information in Mercurial?

Thanks,

-Joe