[PATCH 1 of 2] update: warn about other topological heads on bare update

Pierre-Yves David pierre-yves.david at ens-lyon.org
Wed Feb 3 13:06:16 EST 2016

On 02/03/2016 05:43 PM, Pierre-Yves David wrote:
> # HG changeset patch
> # User Pierre-Yves David <pierre-yves.david at fb.com>
> # Date 1454424542 0
> #      Tue Feb 02 14:49:02 2016 +0000
> # Node ID d61062a8e69c5586171a9207994c13dfc69ea975
> # Parent  8e79ad2da8a69735488402fd018dd82bc1eb9309
> # EXP-Topic destination
> # Available At http://hg.netv6.net/marmoute-wip/mercurial/
> #              hg pull http://hg.netv6.net/marmoute-wip/mercurial/ -r d61062a8e69c
> update: warn about other topological heads on bare update
> A concern around the user experience of Mercurial is user getting stuck on there
> own topological branch forever. For example, someone pulling another topological
> branch, missing that message in pull asking them to merge and getting stuck on
> there own local branch.
> The current way to "address" this concern was for bare 'hg update' to target the
> tipmost (also latest pulled) changesets and complain when the update was not
> linear. That way, failure to merge newly pulled changesets would result in some
> kind of failure.
> Yet the failure was quite obscure, not working in all cases (eg: commit right
> after pull) and the behavior was very impractical in the common case
> (eg: issue4673).
> To be able to change that behavior, we need to provide other ways to alert a
> user stucks on one of many topological head. We do so with an extra message after
> bare update:
>    1 other heads for branch "default"
> Bookmark get its own special version:
>    %i other divergent bookmarks for "%s"

I somewhat got interrupted in the update of this commit message and 
never noticed.

The last thing I wanted to says is:

- yes the message is not greate
- yes it lack a hint that explain how to handle the situation (see in 
code comment),

But I would like some message to get it so that we can move forward with 
the core of this work, changing the default destination for update and 
all the other nicety we can get from there.

I expect use to iterate on this message/hint over the 3 month between 
now and the release.

Pierre-Yves David

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