changeset 1291:1e3c607cf4a5

merge with stable
author Pierre-Yves David <pierre-yves.david@fb.com>
date Wed, 29 Apr 2015 11:42:06 -0700
parents 8aa9a21156fe (current diff) 12d5c9eaa86d (diff)
children 62229e7451f7
files docs/evolve-collaboration.rst docs/figures/edit-is-rewrite-step1.svg docs/figures/edit-is-rewrite-step2.svg docs/figures/error-conflicting.svg docs/figures/error-extinct.svg docs/figures/error-obsolete.svg docs/figures/error-unstable.svg docs/figures/example-1-update.svg docs/figures/example-2-split.svg docs/figures/explain-troubles-concurrent-10-solution.svg docs/figures/explain-troubles-concurrent-10-sumup.svg docs/figures/explain-troubles-latecomer-10-sumup.svg docs/figures/explain-troubles-latecomer-15-solution.svg docs/figures/explain-troubles-unstable-10-sumup.svg docs/figures/explain-troubles-unstable-15-solution.svg docs/figures/git.svg docs/figures/simple-3-merge.svg docs/figures/simple-4-reorder.svg docs/figures/simple-5-delete.svg docs/instability.rst docs/obs-concept.rst docs/obs-implementation.rst docs/qsync.rst
diffstat 30 files changed, 65 insertions(+), 9676 deletions(-) [+]
line wrap: on
line diff
--- a/README	Wed Apr 29 10:36:43 2015 -0700
+++ b/README	Wed Apr 29 11:42:06 2015 -0700
@@ -51,6 +51,10 @@
 Changelog
 =========
 
+5.1.5 --
+
+- minor documentation cleanup
+
 5.1.4 -- 2015-04-23
 
 - significant documentation update
--- a/docs/concepts.rst	Wed Apr 29 10:36:43 2015 -0700
+++ b/docs/concepts.rst	Wed Apr 29 11:42:06 2015 -0700
@@ -24,7 +24,7 @@
           isn't quite right yet, and the diagrams are missing for
           malformatted.)
 
-This document follows standard set theory notation:
+This document follows standard set theory notation::
 
   x ∈ A: x is a member of A
 
@@ -133,7 +133,7 @@
 public phase; only mutable changesets are divergent).
 
 The collective term for unstable, bumped, and divergent changeset is
-*troubled*:
+*troubled*::
 
   troubled = unstable ∪ bumped ∪ divergent
 
@@ -155,7 +155,7 @@
 changesets; these are bugs and will be fixed in due course.)
 
 All hidden changesets are obsolete, and all obsolete changesets are
-part of your repository. Mathematically speaking:
+part of your repository. Mathematically speaking::
 
   repo ⊇ obsolete ⊇ hidden
 
@@ -177,7 +177,7 @@
 Why is this changeset visible?
 ------------------------------
 
-Any changeset which is not hidden is *visible*. That is,
+Any changeset which is not hidden is *visible*. That is, ::
 
   visible = repo ∖ hidden
 
@@ -185,7 +185,7 @@
 changesets that are in *repo* but not in *hidden*.)
 
 After amending or pruning a changeset, you might expect it to be
-hidden. It doesn't always work out that way. The precise rules are:
+hidden. It doesn't always work out that way. The precise rules are::
 
   hideable = obsolete
   blockers = bookmarks ∪ parents(workingcopy) ∪ localtags
@@ -193,7 +193,7 @@
 
 This will probably be clearer with a worked example. First, here's a
 repository with some obsolete changesets, some troubled changesets,
-one bookmark, a working copy, and some hidden changesets:
+one bookmark, a working copy, and some hidden changesets::
 
         x-x
        /
@@ -202,7 +202,7 @@
       x-x-o
 
 Here's the computation required to determine which changesets are
-hidden:
+hidden::
 
   repo = { 0, 1, 2, 3, 4, 5, 6, 7, 8 }
 
--- a/docs/evolve-collaboration.rst	Wed Apr 29 10:36:43 2015 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,135 +0,0 @@
-.. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
-..                Logilab SA        <contact@logilab.fr>
-
-------------------------------------------------
-Collaboration Using Evolve: A user story
-------------------------------------------------
-
-
-After having written some code for ticket #42, Alice starts a patch
-(this will be kind of like a 'work-in-progress' checkpoint
-initially)::
-
-    $ hg ci -m '[entities] remove magic'
-
-Instant patch! Note how the default phase of this changeset is (still)
-in "draft" state.
-
-This is easily checkable::
-
-    $ hg phase tip
-    827: draft
-
-See? Until the day it becomes a "public" changeset, this can be
-altered to no end. How? It happens with an explicit::
-
-    $ hg phase --public
-
-In practice, pushing to a "publishing" repository can also turn draft
-changesets into public ones. Older Mercurial releases are automatically
-"publishing" since they do not have the notion of non-public changesets
-(or mutable history).
-
-During the transition from older Mercurial servers to new ones, this will
-happen often, so be careful.
-
-Now let's come back to our patch. Next hour sees good progress and Alice
-wants to complete the patch with the recent stuff (all that's shown by
-an "hg diff") to share with a co-worker, Bob::
-
-    $ hg amend -m '[entities] fix frobulator (closes #42)'
-
-Note that we also fix the commit message. (For recovering MQ users: this
-is just like "hg qrefresh -m").
-
-Before leaving, let's push to the central shared repository. That will
-give Bob the signal that something is ripe for review / further amendments::
-
-    $ hg push # was done with a modern mercurial, draft phase is preserved
-
-The next day, Bob, who arrives very early, can immediately work out
-some glitches in the patch.
-
-He then starts two others, for ticket #43 and #44 and finally commits them.
-Then, as original worker arrives, he pushes his stuff.
-
-Alice, now equipped with enough properly sugared coffee to survive the
-next two hours::
-
-    $ hg pull
-
-Then::
-
-    $ hg up "tip ~ 2"
-
-brings her to yesterday's patch. Indeed the patch serial number has
-increased (827 still exists but has been obsoleted).
-
-She understands that her original patch has been altered. But how did it
-evolve?
-
-The enhanced hgview shows the two patches. By default only the most
-recent version of a patch is shown.
-
-Now, when Alice installed the mutable-history extensions, she got an alias
-that allows her to see the diff between two amendments, defined like this::
-
-    odiff=diff --rev 'limit(obsparents(.),1)' --rev .
-
-She can see exactly how Bob amended her work.
-
-* odiff
-
-
-Amend ... Stabilize
---------------------
-
-Almost perfect! Alice just needs to fix a half dozen grammar oddities in
-the new docstrings and it will be publishable.
-
-Then, another round of:
-
-    $ hg amend
-
-and a quick look at hgview ... shows something strange (at first).
-
-Ticket #42 yesterday's version is still showing up, with two descendant lineages:
-
-* the next version, containing grammar fixes,
-
-* the two stacked changesets for tickets #43 .. 44 committed by Bob.
-
-Indeed, since this changeset still has non-obsolete descendant
-changesets it cannot be hidden. This branch (old version of #42 and
-the two descendants by C.W.) is said to be _unstable_.
-
-Why would one want such a state? Why not auto-stabilize each time "hg
-amend" is typed out?
-
-Alice for one, wouldn't want to merge each time she amends something that
-might conflict with the descendant changesets. Remember she is
-currently updating the very middle of an history!
-
-Being now done with grammar and typo fixes, Alice decides it is time to
-stabilize again the tree. She does::
-
-    $ hg evolve
-
-two times, one for each unstable descendant. The last time, hgview
-shows her a straight line again. Wow! that feels a bit like a
-well-planned surgical operation. At the end, the patient tree has
-been properly trimmed and any conflict properly handled.
-
-Of course nothing fancy really happened: each "stablilize" can be
-understood in terms of a rebase of the next unstable descendant to the
-newest version of its parent (including the possible manual conflict
-resolution intermission ...).
-
-Except that rebase is a destructive (it removes information from the
-repository), unrecoverable operation, and the "evolve + obsolete"
-combo, using changeset copy and obsolescence marker, provides evolution
-semantics by only adding new information to the repository (but more
-on that later).
-
-She pushes again.
-
--- a/docs/evolve-faq.rst	Wed Apr 29 10:36:43 2015 -0700
+++ b/docs/evolve-faq.rst	Wed Apr 29 11:42:06 2015 -0700
@@ -1,19 +1,19 @@
 .. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
 ..                Logilab SA        <contact@logilab.fr>
 
----------------------------------------------------------------------
+-------------
 Evolve How To
----------------------------------------------------------------------
+-------------
 
 
 
 Add a changeset: ``commit``
-------------------------------------------------------------
+---------------------------
 
 Just use commit as usual. New changesets will be in the `draft` phase.
 
 Rewrite a changeset: ``commit --amend``
-------------------------------------------------------------
+---------------------------------------
 
 It writes a new changeset combining working-directory parent changes and parent.
 It will work on any `draft` or `secret` changeset. It will not work on `public`
@@ -36,7 +36,7 @@
 
 
 Move a changeset: ``grab``
-------------------------------------------------------------
+--------------------------
 
 You can use ``hg grab <rev>`` to move a rev at your current location, making the
 old version obsolete.
@@ -45,7 +45,7 @@
 
 
 Delete a changeset: ``prune``
-------------------------------------------------------------
+-----------------------------
 
 A new ``prune`` command allows removing a changeset.
 
@@ -53,7 +53,7 @@
 
 
 Moving within the history: ``gdown`` and ``gup``
-------------------------------------------------------------
+------------------------------------------------
 
 While working on mutable part of the history you often need to move between
 mutable commits.
@@ -67,7 +67,7 @@
           feeling back.
 
 Collapse changesets: ``fold``
-------------------------------------------------------------
+-----------------------------
 
 You can use ``hg fold`` to collapse multiple changesets in a single one.
 
@@ -78,7 +78,7 @@
 ``hg fold -r <revset>`` fold everything changeset matching the revset together.
 
 Getting changes out of a commit
-------------------------------------------------------------
+-------------------------------
 
 The ``hg uncommit`` command lets you rewrite the parent commit without
 selected changed files. Target files content is not altered and
@@ -94,7 +94,7 @@
   M celestine
 
 Split a changeset
------------------------
+-----------------
 
 To split on file boundaries, just use ``uncommit`` command.
 
@@ -120,7 +120,7 @@
 
 
 Update my current work in progress after a pull
-----------------------------------------------
+-----------------------------------------------
 
 Whenever you are working on some changesets, it is more likely that a pull
 will, eventually, import new changesets in your tree.
@@ -133,7 +133,7 @@
 
 
 Move multiple changesets: ``rebase``
-------------------------------------------------------------
+------------------------------------
 
 You can still use rebase to move a whole segment of the changeset graph together.
 
@@ -141,7 +141,7 @@
              divergent versions of the changesets.
 
 Resolve history troubles: ``evolve``
-------------------------------------------------------------
+------------------------------------
 
 When you rewrite (amend) a changeset with children without rewriting
 those children you create *unstable* changesets and *suspended
@@ -155,7 +155,7 @@
 
 
 Fix my history afterward: ``prune -n``
-------------------------------------------------------------
+--------------------------------------
 
 Sometimes you need to create an obsolete marker by hand. This may happen when
 upstream has applied some of your patches for example.
@@ -164,7 +164,7 @@
 marker.
 
 View diff from the last amend
-------------------------------------------------------------
+-----------------------------
 
 An ``odiff`` alias have been added by ``enable.sh``
 
@@ -173,7 +173,7 @@
     odiff = diff --rev 'limit(precursors(.),1)' --rev .
 
 View obsolete markers
-------------------------------------------------------------
+---------------------
 
 hgview_ is the only viewer that currently supports this feature. You
 need version 1.6.2
@@ -193,10 +193,10 @@
 
 
 Important Note
-=====================================================================
+==============
 
 View change to your file
-------------------------------------------------------------
+------------------------
 
 Extinct changesets are hidden using the *hidden* feature of mercurial.
 
--- a/docs/evolve-good-practice.rst	Wed Apr 29 10:36:43 2015 -0700
+++ b/docs/evolve-good-practice.rst	Wed Apr 29 11:42:06 2015 -0700
@@ -6,7 +6,7 @@
 -----------------------------------------
 
 Avoid unstability
---------------------------------
+-----------------
 
 The less unstability you have the less you need to resolve.
 
@@ -14,7 +14,7 @@
 not ready neither.
 
 Branch as much as possible
---------------------------------
+--------------------------
 
 This is not MQ; you are not constrained to linear history.
 
@@ -22,7 +22,7 @@
 and conflict.
 
 Rewrite your changes only
-------------------------------------------------
+-------------------------
 
 There is no descent conflict detection and handling right now.
 Rewriting other people's changesets guarantees that you will get
@@ -40,7 +40,7 @@
 
 
 Do not get too confident
----------------------------
+------------------------
 
 This is an experimental extension and a complex concept. This is beautiful,
 powerful and robust on paper, but the tool and your mind may not be prepared for
--- a/docs/figures/edit-is-rewrite-step1.svg	Wed Apr 29 10:36:43 2015 -0700
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--- a/docs/from-mq.rst	Wed Apr 29 10:36:43 2015 -0700
+++ b/docs/from-mq.rst	Wed Apr 29 11:42:06 2015 -0700
@@ -1,12 +1,12 @@
 .. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
 ..                Logilab SA        <contact@logilab.fr>
 
--------------------------------------------
+-----------------------------------
 From MQ To Evolve, The Refugee Book
--------------------------------------------
+-----------------------------------
 
 Cheat sheet
--------------
+-----------
 
 ==============================  ============================================
 mq command                       new equivalent
@@ -28,10 +28,10 @@
 
 
 Replacement details
----------------------
+-------------------
 
 hg qseries
-```````````
+``````````
 
 All your work in progress is now in real changesets all the time.
 
@@ -45,7 +45,7 @@
   wip = log -r 'not public()' --template='{rev}:{node|short} {desc|firstline}\n'
 
 hg qnew
-````````
+```````
 
 With evolve you handle standard changesets without an additional overlay.
 
@@ -66,7 +66,7 @@
   new-commit=secret
 
 hg qref
-````````
+```````
 
 A new command from evolution will allow you to rewrite the changeset you are
 currently on. Just call:
@@ -90,7 +90,7 @@
 .. note: refresh is an alias for amend
 
 hg qref --exclude
-`````````````````````
+`````````````````
 
 To remove changes from your current commit use::
 
@@ -98,7 +98,7 @@
 
 
 hg qpop
-`````````
+```````
 
 The following command emulates the behavior of hg qpop:
 
@@ -136,14 +136,14 @@
 
 
 hg qrm
-```````
+``````
 
 evolution introduce a new command to mark a changeset as "not wanted anymore".::
 
   $ hg prune <revset>
 
 hg qfold
-`````````
+````````
 
 
 ::
@@ -151,14 +151,14 @@
   $ hg fold first::last
 
 hg qdiff
-`````````
+````````
 
 ``pdiff`` is an alias for `hg diff -r .^` It works like qdiff, but outside MQ.
 
 
 
 hg qfinish and hg qimport
-````````````````````````````
+`````````````````````````
 
 These are not necessary anymore. If you want to control the
 mutability of changesets, see the phase feature.
@@ -166,7 +166,7 @@
 
 
 hg qcommit
-```````````````
+``````````
 
 If you really need to send patches through versioned mq patches, you should
 look at the qsync extension.
--- a/docs/index.rst	Wed Apr 29 10:36:43 2015 -0700
+++ b/docs/index.rst	Wed Apr 29 11:42:06 2015 -0700
@@ -4,6 +4,14 @@
 Changeset Evolution with Mercurial
 ==================================
 
+.. toctree::
+   :maxdepth: 2
+
+   user-guide
+   sharing
+   concepts
+   from-mq
+
 `evolve`_ is an experimental Mercurial extension for safe mutable history.
 
 .. _`evolve`: http://mercurial.selenic.com/wiki/EvolveExtension
@@ -134,6 +142,6 @@
   * If you're coming from MQ, see the `MQ migration guide`_ (incomplete).
 
 .. _`user guide`: user-guide.html
+.. _`sharing mutable history`: sharing.html
 .. _`concepts`: concepts.html
-.. _`sharing mutable history`: sharing.html
 .. _`MQ migration guide`: from-mq.html
--- a/docs/instability.rst	Wed Apr 29 10:36:43 2015 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,222 +0,0 @@
-.. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
-..                Logilab SA        <contact@logilab.fr>
-
------------------------------------
-The instability Principle
------------------------------------
-
-
-
-An intrinsic contradiction
------------------------------------
-
-XXX starts by talking about getting ride of changeset.
-
-DVCSes bring two new major concepts to the version control scene:
-
-    * History is organized as a robust DAG,
-    * History can be rewritten.
-
-However, the two concepts are in contradiction:
-
-To achieve a robust history, three key elements are gathered in *changesets*:
-
-    * Full snapshot of the versioned content,
-    * Reference to the previous full snapshot used to build the new one,
-    * A description of the change which leads from the old content to the new content.
-
-All three elements are used to compute a *unique* hash that identifies the changeset
-(with various other metadata). This identification is a key part of DVCS design.
-
-This is a very useful property because changing B's parent means
-changing B's content too. This requires the creation of **another**
-changeset, which is semantically good.
-
-.. figure:: ./figures/edit-is-rewrite-step2.svg
-
-
-To avoid duplication, the older changeset is usually discarded from accessible
-history. I'm calling them *obsolete* changesets.
-
-
-But rewriting a changeset with children does not change the
-children's parents! And because children of the rewritten changeset
-still **depend** on the older "dead" version of the changeset, we
-cannot get rid of this dead version.
-
-::
-
-  Schema base,  A and A' and B.
-
-I'm calling these children **unstable** because they are based on a
-dead changeset and prevent people from getting rid of it.
-
-This instability is an **unavoidable consequence** of the strict dependency of
-changesets.  Rewriting history always needs to take it into account and
-provide a way to rewrite the descendants of the new changeset to avoid
-coexistence of the old and new versions of a rewritten changeset.
-
-
-Everybody is working around the issue
-------------------------------------------------
-
-I'm not claiming that rewriting history is impossible. People have been successfully
-doing it for years. However they all need to work around *instability*. Several
-workaround strategies exist.
-
-
-Rewriting all at once
-``````````````````````````
-
-The simplest way to avoid instability is to ensure rewriting
-operations always end in a stable situation. This is achieved by
-rewriting all affected changesets at the same time.
-
-Rewriting all descendants at the same time when rewriting a changeset.
-
-::
-
-  Schema!
-
-Several Mercurial commands apply it: rebase, collapse, histedit.
-Mercurial also refuses to amend changesets with descendants. The git
-branch design enforces this approach in git too.
-
-
-However, DVCS are **distributed**. This means that you do not control what
-happens outside your repository. Once a changeset has been exchanged *outside*,
-there is no way to be sure it does not have descendants somewhere else.
-Therefore **if you rewrite changeset that exists elsewhere, you can't eradicate
-the risk of instability.**
-
-Do not rewrite exchanged changesets
-```````````````````````````````````
-
-To work around the issue above, Mercurial introduced phases, which
-prevent you from rewriting shared changesets and ensure others can't
-pull certain changesets from you. But this is a very frustrating
-limitation that prevents you to efficiently sharing, reviewing and
-collaborating on mutable changesets.
-
-In the Git world, they use another approach to prevent instability. By
-convention only a single developer works on a changeset contained in
-a named branch. But once again this is a huge blocker for
-collaborating. Moreover clueless people **will** mess up social
-convention soon or later.
-
-
-Lose the DAG robustness
-````````````````````````````
-
-The other approach in Mercurial is to keep the mutable part of the
-history outside the DVCS constraint. This is the MQ approach of
-sticking a quilt queue over Mercurial.
-
-This allow much more flexible workflow but two major feature are lost in the
-process:
-
-:graceful merge: MQ uses plain patch to store changeset contents, which has
-                 problems in changing context. Applying your queue
-                 becomes very painful when context changes.
-
-:easy branching: A quilt queue is by definition a linear queue, increasing risk
-                 of conflict.
-
-It is possible to collaborate over versioned MQ! But you are going to
-have a lot of trouble.
-
-Ignore conflicts
-```````````````````````````````````
- 
-Another ignored issue is a conflicting rewrite of the same changeset.
-If a changeset is rewritten two times we have two newer versions,
-and duplicated history is complicated to merge.
-
-Mercurial work around by
-
-The "One set of mutable changset == One developer" mantra is also a way to work
-around conflicting rewriting of changeset. If two different people are able to
-
-The git branch model allows overwriting changeset version by another
-one, but it does not care about divergent version. It is the equivalent
-of "common ftp" source management for changesets.
-
-Facing The Danger Once And For All
-------------------------------------------------
-
-Above we saw that the more effort you put to avoid instability, the more options
-you deny. And even the most restrictive workflow can't guarantee that instability
-will never show up!
-
-Obsolete marker can handle the job
-```````````````````````````````````
-
-It is time to provide a full-featured solution to deal with
-instability and to stop working around the issue! This is why I
-am developing a new feature for Mercurial called "Obsolete markers".
-Obsolete markers have two key properties:
-
-
-* Any "old" changeset we want to get rid of is **explicitly** marked
-  as "obsolete" by history rewriting operations.
-
-  By explicitly marking the obsolete part of the history, we will be able to
-  easily detect instability situation.
-
-* Relations between old and new version of changesets are tracked by obsolete
-  markers.
-
-  By storing a meta-history of changeset evolution we are able to easily resolve
-  instability and edit conflicts [#]_ .
-
-.. [#] Edit conflicts is another major obstable to collaboration. See the
-       section dedicated to obsolete marker for details.
-
-Improved robustness == improved simplicity
-````````````````````````````````````````````````
-
-This proposal should **first** be seen as a safety measure.
-
-It allows detecting instability as soon as possible.
-
-::
-
-    $ hg pull
-    added 3 changeset
-    +2 unstable changeset
-    (do you want "hg evolve" ?)
-    working directory parent is obsolete!
-    $ hg push
-    outgoing unstable changesets
-    (use "hg evolve" or force the push)
-
-And it should not not encourage people to create instability.
-
-::
-
-    $ hg up 42
-    $ hg commit --amend
-    changeset have descendant.
-    $ hg commit --amend -f
-    +5 unstable changeset
-
-    $ hg rebase -D --rev 40::44
-    rebasing already obsolete changeset 42:AAA will conflict with newer version 48:BBB
-
-While allowing powerful feature
-````````````````````````````````````````````````
-
-
-* Help to automatically solve instability.
-
-* "prune" changeset remotely.
-
-* track resulting changeset when submitting patch//pull request.
-
-* Focus on what you do:
-
-  I do not like the "all at once" model of history rewriting. I'm comfortable
-  with instability and obsolete marker offer all the tool to safely create and
-  handle instability locally.
-
-
--- a/docs/obs-concept.rst	Wed Apr 29 10:36:43 2015 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,390 +0,0 @@
-.. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
-..                Logilab SA        <contact@logilab.fr>
-
------------------------------------------------------------
-Why Do We Need a New Concept
------------------------------------------------------------
-
-Current DVCSes are great tools for forging a series of flawless
-changesets on your own. But they perform poorly when it comes to
-**sharing** some work in progress and **collaborating** on such work
-in progress.
-
-When people forge a new version of a changeset they actually create a
-new changeset and get rid of the original changeset. Difficulties to
-collaborate mostly came from the way old content is *removed* from
-a repository.
-
-Mercurial Approach: Strip
------------------------------------------------------
-
-With the current version of mercurial, every changeset that exists in
-your repository is *visible* and *meaningful*. To delete old
-(rewritten) changesets, mercurial removes them from the repository
-storage with an operation called *strip*. After the *stripping*, the
-repository looks as if the changeset never existed.
-
-This approach is simple and effective except for one big
-drawback: you can remove changesets from **your repository only**. If
-a stripped changeset exists in another repository it touches, it will
-show up again. This is because a shared changeset becomes
-part of a shared global history. Stripping a changeset from all
-repositories is at best impractical and in most case impossible.
-
-As consequence, **you can not rewrite something once you exchange it with
-others**. The old version will still exist along side the new one [#]_.
-
-Moreover stripping changesets creates backup bundles. This allows
-restoration of the deleted changesets, but the process is painful.
-
-Finally, as the repository format is not optimized for deletion. stripping a
-changeset may be slow in some situations.
-
-To sum up, the strip approach is very simple but does not handle
-interaction with the outer world, which is very unfortunate for a
-*Distributed* VCS.
-
-.. [#] various work around exists but they require their own workflows
-   which are distinct from the very elegant basic workflow of
-   Mercurial.
-
-Git Approach: Overwrite Reference
------------------------------------------------------
-
-The Git approach to repository structure is a bit more complex: there
-can be any amount of unrelated changesets in a repository, and **only
-changesets referenced by a git branch** are *visible* and
-*meaningful*.
-
-
-.. figure:: ./figures/git.*
-
-
-This simplifies the process of getting rid of old changesets. You can
-just leave them in place and move the reference on the new one. You
-can then propagate this change by moving the git-branch on remote host
-with the newer version of the marker overwriting the older one.
-
-This approach goes a bit further but still has a major drawback:
-
-Because you **overwrite** the git-branch, you have no conflict
-resolution. The last to act wins. This makes collaboration on multiple
-changesets difficult because you can't merge concurrent updates on a
-changeset.
-
-Every overwrite is a forced operation where the operator says, "yes I
-want this to replace that". In highly distributed environments, a user
-may end up with conflicting references and no proper way to choose.
-
-Because of this way to visualize a repository, git-branches are a core
-part of git, which makes the user interface more complicated and
-constrains moving through history.
-
-Finally, even if all older changesets still exist in the repository,
-accesing them is still painful.
-
-
------------------------------------------------------
-The Obsolete Marker Concept
------------------------------------------------------
-
-
-As none of the concepts was powerful enough to fulfill the need of
-safely rewriting history, including easy sharing and collaboration on
-mutable history, we needed another one.
-
-Basic concept
------------------------------------------------------
-
-
-Every history rewriting operation stores the information that old rewritten
-changeset is replaced by newer version in a given set of changesets.
-
-All basic history rewriting operation can create an appropriate obsolete marker.
-
-
-.. figure:: ./figures/example-1-update.*
-
-    *Updating* a changeset
-
-    Create one obsolete marker: ``([A'] obsolete A)``
-
-
-
-.. figure:: ./figures/example-2-split.*
-
-    *Splitting* a changeset in multiple one
-
-    Create one obsolete marker ``([B1, B2] obsolete B)]``
-
-
-.. figure:: ./figures/simple-3-merge.*
-
-    *Merging* multiple changeset in a single one
-
-    Create two obsolete markers ``([C] obsolete A), ([C] obsolete B)``
-
-.. figure:: ./figures/simple-4-reorder.*
-
-    *Moving* changeset around
-
-    Reordering those two changesets need two obsolete markers:
-    ``([A'] obsolete A), ([B'] obsolete B)``
-
-
-
-.. figure:: ./figures/simple-5-delete.*
-
-    *Removing* a changeset:
-
-    One obselete marker ``([] obsolete B)``
-
-
-To conclude, a single obsolete marker express a relation from **0..n** new
-changesets to **1** old changeset.
-
-Basic Usage
------------------------------------------------------
-
-Obsolete markers create a perpendicular history: **a versioned
-changeset graph**. This means that offers the same features we have
-for versioned files but applied to changeset:
-
-First: we can display a **coherent view** of the history graph in which only a
-single version of your changesets is displayed by the UI.
-
-Second, because obsolete changeset content is still **available**. You can 
-you can
-
-    * **browse** the content of your obsolete commits,
-
-    * **compare** newer and older versions of a changeset,
-
-    * **restore** content of previously obsolete changesets.
-
-Finally, the obsolete marker can be **exchanged between
-repositories**. You are able to share the result on your history
-rewriting operations with other prople and **collaborate on the
-mutable part of the history**.
-
-Conflicting history rewriting operation can be detected and
-**resolved** as easily as conflicting changes on a file.
-
-
-Detecting and solving tricky situations
------------------------------------------------------
-
-History rewriting can lead to complex situations. The obsolete marker
-introduces a simple representation for this complex reality. But
-people using complex workflows will one day or another have to face
-the intrinsic complexity of some real-world situation.
-
-This section describes possible situations, defines precise sets of
-changesets involved in such situations and explains how the error
-cases can be resolved automatically using the available information.
-
-
-Obsolete changesets
-````````````````````
-
-Old changesets left behind by obsolete operation are called **obsolete**.
-
-With the current version of mercurial, this *obsolete* part is stripped from the
-repository before the end of every rewriting operation.
-
-.. figure:: ./figures/error-obsolete.*
-
-    Rebasing `B` and `C` on `A` (as `B'`, `C'`)
-
-    This rebase operation added two obsolete markers from new
-    changesets to old changesets. These two old changesets are now
-    part of the *obsolete* part of the history.
-
-In most cases, the obsolete set will be fully hidden to both the UI and
-discovery, hence users do not have to care about them unless they want to
-audit history rewriting operations.
-
-Unstable changesets
-```````````````````
-
-While exploring the possibilities of the obsolete marker a bit
-further, you may end up with *obsolete* changesets which have
-*non-obsolete* children. There is two common ways to achieve this:
-
-* Pull a changeset based of an old version of a changeset [#]_.
-
-* Use a partial rewriting operation. For example amend on a changeset with
-  children.
-
-*Non-obsolete* changeset based on *obsolete* one are called **unstable**
-
-.. figure:: ./figures/error-unstable.*
-
-    Amend `A` into `A'` leaving `B` behind.
-
-    In this situation we cannot consider `B` as *obsolete*. But we
-    have all the necessary data to detect `B` as an *unstable* branch
-    of the history because its parent `A` is *obsolete*. In addition,
-    we have enough data to automatically resolve this instability: we
-    know that the new version of `B` parent (`A`) is `A'`. We can
-    deduce that we should rebase `B` on `A'` to get a stable history
-    again.
-
-Proper warnings should be issued when part of the history becomes
-unstable. The UI will be able to use the obsolete marker to
-automatically suggest a resolution to the user of even carry them out
-for them.
-
-
-XXX details on automatic resolution for
-
-* movement
-
-* handling deletion
-
-* handling split on multiple head
-
-
-.. [#] For this to happen one needs to explicitly enable exchange of draft
-       changesets. See phase help for details.
-
-The two parts of the obsolete set
-``````````````````````````````````````
-
-The previous section shows that there could be two kinds of *obsolete*
-changesets:
-
-* an *obsolete* changeset with no or *obsolete* only descendants is called **extinct**.
-
-* an *obsolete* changeset with *unstable* descendants is called **suspended**.
-
-
-.. figure:: ./figures/error-extinct.*
-
-    Amend `A` and `C` leaving `B` behind.
-
-    In this example we have two *obsolete* changesets: `C` with no *unstable*
-    children is *extinct*. `A` with *unstable* descendant (`B`) is *suspended*.
-    `B` is *unstable* as before.
-
-
-Because nothing outside the obsolete set default on *extinct*
-changesets, they can be safely hidden in the UI and even garbage
-collected. *Suspended* changesets have to stay visible and available
-until their unstable descendant are rewritten into stable version.
-
-
-Conflicting rewrites
-````````````````````
-
-If people start to concurrently edit the same part of the history they will
-likely meet conflicting situations when a changeset has been rewritten in two
-different ways.
-
-
-.. figure:: ./figures/error-conflicting.*
-
-    Conflicting rewrite of `A` into `A'` and `A''`
-
-This kind of conflict is easy to detect with an obsolete marker
-because an obsolete changeset can have more than one new version. It
-may be seen as the multiple heads case. Mercurial warns you about this
-on pull. It is resolved the same way by a merge of A' and A'' that
-will keep the same parent than `A'` and `A''` with two obsolete
-markers pointing to both `A` and `A'`
-
-.. figure:: ./figures/explain-troubles-concurrent-10-solution.*
-
-Allowing multiple new changesets to obsolete a single one allows to
-distinguish a split changeset from a history rewriting conflict.
-
-Reliable history
-``````````````````````
-
-Obsolete markers help to smooth rewriting operation process. However
-they do not change the fact that **you should only rewrite the mutable
-part of the history**. The phase concept enforces this rule by
-explicitly defining a public immutable set of changesets. Rewriting
-operations refuse to work on public changesets, but there are still
-some corner cases where previously rewritten changesets are made
-public.
-
-Special rules apply for obsolete markers pointing to public changesets:
-
-* Public changesets are excluded from the obsolete set (public
-  changesets are never hidden or candidate to garbage collection)
-
-* *newer* version of a public changeset are called **bumped** and
-  highlighted as an error case.
-
-.. figure:: ./figures/explain-troubles-concurrent-10-sumup.*
-
-Solving such an error is easy. Because we know what changeset a
-*bumped* tries to rewrite, we can easily compute a smaller
-changeset containing only the change from the old *public* to the new
-*bumped*.
-
-.. figure:: ./figures/explain-troubles-concurrent-15-solution.*
-
-
-Conclusion
-----------------
-
-The obsolete marker is a powerful concept that allows mercurial to safely handle
-history rewriting operations. It is a new type of relation between Mercurial
-changesets which tracks the result of history rewriting operations.
-
-This concept is simple to define and provides a very solid base for:
-
-
-- Very fast history rewriting operations,
-
-- auditable and reversible history rewriting process,
-
-- clean final history,
-
-- sharing and collaborating on the mutable part of the history,
-
-- gracefully handling history rewriting conflicts,
-
-- various history rewriting UI's collaborating with an underlying common API.
-
-.. list-table:: Comparison on solution [#]_
-   :header-rows: 1
-
-   * - Solution
-     - Remove changeset locally
-     - Works on any point of your history
-     - Propagation
-     - Collaboration
-     - Speed
-     - Access to older version
-
-   * - Strip
-     - `+`
-     - `+`
-     - \
-     - \ 
-     - \ 
-     - `- -`
-
-   * - Reference
-     - `+`
-     - \ 
-     - `+`
-     - \ 
-     - `+`
-     - `-`
-
-   * - Obsolete
-     - `+`
-     - `+`
-     - `++`
-     - `++`
-     - `+`
-     - `+`
-
-
-
-.. [#] To preserve good tradition in comparison table, an overwhelming advantage
-       goes to the defended solution.
--- a/docs/obs-implementation.rst	Wed Apr 29 10:36:43 2015 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,106 +0,0 @@
-.. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
-..                Logilab SA        <contact@logilab.fr>
-
------------------------------------------------------
-Implementation of Obsolete Marker
------------------------------------------------------
-.. warning:: This document is still in heavy work in progress
-
-Main questions about Obsolete Marker Implementation
------------------------------------------------------
-
-
-
-
-How shall we exchange Marker over the Wire ?
-`````````````````````````````````````````````````````````
-
-We can have a lot of markers. We do not want to exchange data for the one we
-already know. Listkey() is not very appropriate there as you get everything.
-
-Moreover, we might want to only hear about Marker that impact changeset we are
-pulling.
-
-pushkey is not batchable yet (could be fixed)
-
-A dedicated discovery and exchange protocol seems mandatory here.
-
-
-Various technical details
------------------------------------------------------
-
-Some stuff that worse to note. some may deserve their own section later.
-
-storing old changeset
-``````````````````````
-
-The new general delta format allows a very efficient storage of two very similar
-changesets. Storing obsolete children using general delta takes no more place
-than storing the obsolete diff. Reverted file will even we reused. The whole
-operation will take much less space the strip backup.
-
-
-Abstraction from history rewriting UI
-```````````````````````````````````````````
-
-How Mercurial handles obsolete marker is independent from what decides
-to create them and what actual operation solves the error case. Any of
-the existing history rewriting UI (rebase, mq, histedit) can lay
-obsolete markers and resolve situation created by others. To go
-further, a hook system of obsolete marker creation would allow each
-mechanism to collaborate with other though a standard and central
-mechanism.
-
-
-Obsolete marker storage
-```````````````````````````
-
-The Obsolete marker will most likely be stored outside standard
-history. They are multiple reasons for this:
-
-First, obsolete markers are really perpendicular to standard history
-there is no strong reason to include it here other than convenience.
-
-Second, storing obsolete marker inside standard history means:
-
-* A changeset must be created every time an obsolete relation is added. Very
-  inconvenient for delete operation.
-
-* Obsolete marker must be forged at the creation of the new changeset. This
-  is very inconvenient for split operation. And in general it becomes
-  complicated to fix history afterward in particular when working with older
-  clients.
-
-Storing obsolete marker outside history have several pros:
-
-* It eases Exchange of obsolete markers without unnecessary obsolete
-  changeset contents.
-
-* It allows tuning the actual storage and protocol exchange while maintaining
-  compatibility with older clients through the wire (as we do the repository
-  format).
-
-* It eases the exchange of obsolete related information during
-  discovery to exchange obsolete changeset relevant to conflict
-  resolution. Exchanging such information deserves a dedicated
-  protocol.
-
-Persistent
-```````````````````````
-
-*Extinct* changeset and obsolete marker will most likely be garbage collected as
-some point. However, archive server may decide to keep them forever in order to
-keep a fully auditable history in its finest conception.
-
-
-Current status
------------------------------------------------------
-
-Obsolete marker are partialy in core.
-
-2.3:
-
-- storage over obsolete marker
-- exchange suing pushkey
-- extinct changeset are properly hidden
-- extinct changeset are excluded from exchange
--- a/docs/obs-terms.rst	Wed Apr 29 10:36:43 2015 -0700
+++ b/docs/obs-terms.rst	Wed Apr 29 11:42:06 2015 -0700
@@ -1,12 +1,12 @@
 .. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
 ..                Logilab SA        <contact@logilab.fr>
 
------------------------------------------------------------
+-----------------------------------
 Terminology of the obsolete concept
------------------------------------------------------------
+-----------------------------------
 
 Obsolete markers
----------------------------------
+----------------
 
 The mutable concept is based on **obsolete markers**. Creating an obsolete
 marker registers a relation between an old obsoleted changeset and its newer
@@ -54,7 +54,7 @@
           better distinction between *direct successors* and **any successors**.
 
 Possible changesets "type"
----------------------------------
+--------------------------
 
 The following table describes names and behaviors of changesets affected by
 obsolete markers. The left column describes generic categories and the right
@@ -182,7 +182,7 @@
 
 
 Command and operation name
----------------------------------
+--------------------------
 
 
 Existing terms
@@ -196,7 +196,7 @@
 
 
 Uncommit
-`````````````
+````````
 
 Remove files from a commit (and leave them as dirty in the working directory)
 
@@ -204,14 +204,14 @@
 `rollback` usage.
 
 Fold
-``````````
+````
 
 Collapse multiple changesets into a unique one.
 
 The *evolve* extension will have a `fold` command.
 
 Prune
-``````````
+`````
 
 Make a changeset obsolete without successors.
 
@@ -223,7 +223,7 @@
 - obsolete: too vague, too long and too generic.
 
 evolve
-```````````````
+``````
 
 Automatically resolve *troublesome* changesets
 (*unstable*, *bumped* and *divergent*)
--- a/docs/qsync.rst	Wed Apr 29 10:36:43 2015 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,19 +0,0 @@
-.. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
-..                Logilab SA        <contact@logilab.fr>
-
----------------------------------------------------------------------
-Qsync: Mercurial to MQ exporter
----------------------------------------------------------------------
-
-
-People may have tools or co-workers that expect to receive mutable history using
-a versioned MQ repository.
-
-For this purpose you can use the ``qsync`` extension.
-
-
-To enable the evolve extension use::
-
-    $ hg clone http://hg-dev.octopoid.net/hgwebdir.cgi/mutable-history/
-    $ mutable-history/iqsync-enable.sh >> ~/.hgrc
-    $ hg help qsync