RFC: acquisition of wlock inside transaction

[Matt Mackall]

On Thu, 2016-05-12 at 04:16 +0900, FUJIWARA Katsunori wrote:
> But, as far as I confirmed with scenarios in *.t test scripts,
> acquisition of wlock inside transaction itself occurs in cases below
> (both via bundle2.processbundle()):
> 
>   - tags.hgtagsfnodescache.write() to write into .hg/cache/hgtagsfnodes1
>   - repoview.trywritehiddencache() to write into .hg/cache/hidden

If these are cases of attempting to opportunistically update caches, then they
should silently fail.

(And that is really the only type of cache write there should be.)

-- 
Mathematics is the supreme nostalgia of our time.