docs/evolve-collaboration.rst
author Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Mon, 04 Feb 2013 18:42:50 +0100
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.. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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..                Logilab SA        <contact@logilab.fr>
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------------------------------------------------
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Collaboration Using Evolve: A user story
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------------------------------------------------
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After having written some code for ticket #42, Alice starts a patch
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(this will be kind of like a 'work-in-progress' checkpoint
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initially)::
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    $ hg ci -m '[entities] remove magic'
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Instant patch! Note how the default phase of this changeset is (still)
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in "draft" state.
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This is easily checkable::
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    $ hg phase tip
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    827: draft
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See? Until the day it becomes a "public" changeset, this can be
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altered to no end. How? It happens with an explicit::
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    $ hg phase --public
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In practice, pushing to a "publishing" repository can also turn draft
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changesets into public ones. Older Mercurial releases are automatically
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"publishing" since they do not have the notion of non-public changesets
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(or mutable history).
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During the transition from older Mercurial servers to new ones, this will
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happen often, so be careful.
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Now let's come back to our patch. Next hour sees good progress and Alice
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wants to complete the patch with the recent stuff (all that's shown by
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an "hg diff") to share with a co-worker, Bob::
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    $ hg amend -m '[entities] fix frobulator (closes #42)'
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Note that we also fix the commit message. (For recovering MQ users: this
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is just like "hg qrefresh -m").
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Before leaving, let's push to the central shared repository. That will
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give Bob the signal that something is ripe for review / further amendments::
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    $ hg push # was done with a modern mercurial, draft phase is preserved
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The next day, Bob, who arrives very early, can immediately work out
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some glitches in the patch.
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He then starts two others, for ticket #43 and #44 and finally commits them.
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Then, as original worker arrives, he pushes his stuff.
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Alice, now equipped with enough properly sugared coffee to survive the
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next two hours::
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    $ hg pull
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Then::
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    $ hg up "tip ~ 2"
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brings her to yesterday's patch. Indeed the patch serial number has
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increased (827 still exists but has been obsoleted).
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She understands that her original patch has been altered. But how did it
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evolve?
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The enhanced hgview shows the two patches. By default only the most
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recent version of a patch is shown.
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Now, when Alice installed the mutable-history extensions, she got an alias
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that allows her to see the diff between two amendments, defined like this::
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    odiff=diff --rev 'limit(obsparents(.),1)' --rev .
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She can see exactly how Bob amended her work.
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* odiff
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Amend ... Stabilize
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--------------------
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Almost perfect! Alice just needs to fix a half dozen grammar oddities in
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the new docstrings and it will be publishable.
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Then, another round of:
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    $ hg amend
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and a quick look at hgview ... shows something strange (at first).
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Ticket #42 yesterday's version is still showing up, with two descendant lineages:
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* the next version, containing grammar fixes,
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* the two stacked changesets for tickets #43 .. 44 committed by Bob.
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Indeed, since this changeset still has non-obsolete descendant
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changesets it cannot be hidden. This branch (old version of #42 and
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the two descendants by C.W.) is said to be _unstable_.
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Why would one want such a state? Why not auto-stabilize each time "hg
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amend" is typed out?
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Alice for one, wouldn't want to merge each time she amends something that
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might conflict with the descendant changesets. Remember she is
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currently updating the very middle of an history!
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Being now done with grammar and typo fixes, Alice decides it is time to
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stabilize again the tree. She does::
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    $ hg evolve
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two times, one for each unstable descendant. The last time, hgview
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shows her a straight line again. Wow! that feels a bit like a
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well-planned surgical operation. At the end, the patient tree has
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been properly trimmed and any conflict properly handled.
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Of course nothing fancy really happened: each "stablilize" can be
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understood in terms of a rebase of the next unstable descendant to the
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newest version of its parent (including the possible manual conflict
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resolution intermission ...).
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Except that rebase is a destructive (it removes information from the
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repository), unrecoverable operation, and the "evolve + obsolete"
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combo, using changeset copy and obsolescence marker, provides evolution
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semantics by only adding new information to the repository (but more
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on that later).
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She pushes again.
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