File: //lib64/python2.7/site-packages/mercurial/obsolete.pyc
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An obsolete marker maps an old changeset to a list of new
changesets. If the list of new changesets is empty, the old changeset
is said to be "killed". Otherwise, the old changeset is being
"replaced" by the new changesets.
Obsolete markers can be used to record and distribute changeset graph
transformations performed by history rewrite operations, and help
building new tools to reconcile conflicting rewrite actions. To
facilitate conflict resolution, markers include various annotations
besides old and news changeset identifiers, such as creation date or
author name.
The old obsoleted changeset is called a "predecessor" and possible
replacements are called "successors". Markers that used changeset X as
a predecessor are called "successor markers of X" because they hold
information about the successors of X. Markers that use changeset Y as
a successors are call "predecessor markers of Y" because they hold
information about the predecessors of Y.
Examples:
- When changeset A is replaced by changeset A', one marker is stored:
(A, (A',))
- When changesets A and B are folded into a new changeset C, two markers are
stored:
(A, (C,)) and (B, (C,))
- When changeset A is simply "pruned" from the graph, a marker is created:
(A, ())
- When changeset A is split into B and C, a single marker is used:
(A, (B, C))
We use a single marker to distinguish the "split" case from the "divergence"
case. If two independent operations rewrite the same changeset A in to A' and
A'', we have an error case: divergent rewriting. We can detect it because
two markers will be created independently:
(A, (B,)) and (A, (C,))
Format
------
Markers are stored in an append-only file stored in
'.hg/store/obsstore'.
The file starts with a version header:
- 1 unsigned byte: version number, starting at zero.
The header is followed by the markers. Marker format depend of the version. See
comment associated with each format for details.
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markers
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<relations> must be an iterable of ((<old>,...), (<new>, ...)[,{metadata}])
tuple. `old` and `news` are changectx. metadata is an optional dictionary
containing metadata for this marker only. It is merged with the global
metadata specified through the `metadata` argument of this function.
Any string values in metadata must be UTF-8 bytes.
Trying to obsolete a public changeset will raise an exception.
Current user and date are used except if specified otherwise in the
metadata attribute.
This function operates within a transaction of its own, but does
not take any lock on the repo.
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