author | Pierre-Yves David <pierre-yves.david@octobus.net> |
Mon, 07 Nov 2022 14:13:59 -0500 | |
changeset 49659 | 7c0a383849a8 |
parent 47017 | da4e6d7a8fdd |
permissions | -rw-r--r-- |
47017
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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Obsolescence markers make it possible to mark changesets that have been |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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deleted or superseded in a new version of the changeset. |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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|
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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Unlike the previous way of handling such changes, by stripping the old |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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changesets from the repository, obsolescence markers can be propagated |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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between repositories. This allows for a safe and simple way of exchanging |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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mutable history and altering it after the fact. Changeset phases are |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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respected, such that only draft and secret changesets can be altered (see |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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:hg:`help phases` for details). |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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Obsolescence is tracked using "obsolescence markers", a piece of metadata |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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tracking which changesets have been made obsolete, potential successors for |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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a given changeset, the moment the changeset was marked as obsolete, and the |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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user who performed the rewriting operation. The markers are stored |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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separately from standard changeset data can be exchanged without any of the |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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precursor changesets, preventing unnecessary exchange of obsolescence data. |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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The complete set of obsolescence markers describes a history of changeset |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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modifications that is orthogonal to the repository history of file |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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modifications. This changeset history allows for detection and automatic |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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resolution of edge cases arising from multiple users rewriting the same part |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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of history concurrently. |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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Current feature status |
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help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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====================== |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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This feature is still in development. |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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Instability |
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help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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=========== |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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Rewriting changesets might introduce instability. |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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There are two main kinds of instability: orphaning and diverging. |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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Orphans are changesets left behind when their ancestors are rewritten. |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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Divergence has two variants: |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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* Content-divergence occurs when independent rewrites of the same changesets |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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lead to different results. |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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* Phase-divergence occurs when the old (obsolete) version of a changeset |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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becomes public. |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
45 |
It is possible to prevent local creation of orphans by using the following config:: |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
|
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[experimental] |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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evolution.createmarkers = true |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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evolution.exchange = true |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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You can also enable that option explicitly:: |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
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da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
changeset
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[experimental] |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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evolution.createmarkers = true |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
diff
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evolution.exchange = true |
da4e6d7a8fdd
help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
parents:
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evolution.allowunstable = true |