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common.txt	240 B	-rw-r--r--
config.txt	116.16 KB	-rw-r--r--
dates.txt	1.25 KB	-rw-r--r--
deprecated.txt	678 B	-rw-r--r--
diffs.txt	1.33 KB	-rw-r--r--
environment.txt	4.28 KB	-rw-r--r--
evolution.txt	2.1 KB	-rw-r--r--
extensions.txt	1.22 KB	-rw-r--r--
filesets.txt	2.07 KB	-rw-r--r--
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Code Editor : evolution.txt

Obsolescence markers make it possible to mark changesets that have been
deleted or superseded in a new version of the changeset.

Unlike the previous way of handling such changes, by stripping the old
changesets from the repository, obsolescence markers can be propagated
between repositories. This allows for a safe and simple way of exchanging
mutable history and altering it after the fact. Changeset phases are
respected, such that only draft and secret changesets can be altered (see
:hg:`help phases` for details).

Obsolescence is tracked using "obsolescence markers", a piece of metadata
tracking which changesets have been made obsolete, potential successors for
a given changeset, the moment the changeset was marked as obsolete, and the
user who performed the rewriting operation. The markers are stored
separately from standard changeset data can be exchanged without any of the
precursor changesets, preventing unnecessary exchange of obsolescence data.

The complete set of obsolescence markers describes a history of changeset
modifications that is orthogonal to the repository history of file
modifications. This changeset history allows for detection and automatic
resolution of edge cases arising from multiple users rewriting the same part
of history concurrently.

Current feature status
======================

This feature is still in development.

Instability
===========

Rewriting changesets might introduce instability.

There are two main kinds of instability: orphaning and diverging.

Orphans are changesets left behind when their ancestors are rewritten.
Divergence has two variants:

* Content-divergence occurs when independent rewrites of the same changesets
  lead to different results.

* Phase-divergence occurs when the old (obsolete) version of a changeset
  becomes public.

It is possible to prevent local creation of orphans by using the following config::

[experimental]
    evolution.createmarkers = true
    evolution.exchange = true

You can also enable that option explicitly::

[experimental]
    evolution.createmarkers = true
    evolution.exchange = true
    evolution.allowunstable = true

${this.title}

Code Editor : evolution.txt