File: //usr/lib/python2.7/dist-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 "precursor" and possible
replacements are called "successors". Markers that used changeset X as
a precursor 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 "precursor markers of Y" because they hold
information about the precursors 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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c C@ s@ x9 | D]1 } t j | d k r t j t d q q Wd S( s search for marker with invalid data and raise error if needed
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Markers can be accessed with two mappings:
- precursors[x] -> set(markers on precursors edges of x)
- successors[x] -> set(markers on successors edges of x)
- children[x] -> set(markers on precursors edges of children(x)
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* ensuring it is hashable
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* encode metadata
If you are a human writing code creating marker you want to use the
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return True if a new marker have been added, False if the markers
already existed (no op).
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qL W| | 8} t g | D] } | d ^ q } | | O} | | 8} | | O} q6 W| S( se return a set of all obsolescence markers relevant to a set of nodes.
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- marker that use this changeset as successor
- prune marker of direct children on this changeset
- recursive application of the two rules on precursors of these markers
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c C@ s5 | j d t x | D] } | t k r | Sq Wd S( s| Return the newest version listed in both versions and our local formats.
Returns None if no common version exists.
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Some successors may be unknown locally.
This is a linear yield unsuited to detecting split changesets. It includes
initial nodes too.i i N( ( R R R R R ( R R t ignoreflagst remainingt seenR R R ( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt
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c c@ s t | } t | } x | r | j } | Vxd | j j | d D]M } | d | @rb qH n | d } | | k rH | j | | j | qH qH Wq Wd S( s Yield node for every precursors of <nodes>.
Some precursors may be unknown locally.
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initial nodes too.i i N( ( R R R R R ( R R R R R R R R ( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt
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c @ s | j } t | j d | } | j r | j j d } x t | | k r t | } t d | D } g | D] } | j r} | j ^ q} } | j t | j | f d | D } t | j d | } qB Wn t d | D S( sR return all nodes in the "foreground" of other node
The foreground of a revision is anything reachable using parent -> children
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augmented with obsolescence information.
Beware that possible obsolescence cycle may result if complex situation.
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| | | <q9 W| | S( s` Return set of all latest successors of initial nodes
The successors set of a changeset A are the group of revisions that succeed
A. It succeeds A as a consistent whole, each revision being only a partial
replacement. The successors set contains non-obsolete changesets only.
This function returns the full list of successor sets which is why it
returns a list of tuples and not just a single tuple. Each tuple is a valid
successors set. Note that (A,) may be a valid successors set for changeset A
(see below).
In most cases, a changeset A will have a single element (e.g. the changeset
A is replaced by A') in its successors set. Though, it is also common for a
changeset A to have no elements in its successor set (e.g. the changeset
has been pruned). Therefore, the returned list of successors sets will be
[(A',)] or [], respectively.
When a changeset A is split into A' and B', however, it will result in a
successors set containing more than a single element, i.e. [(A',B')].
Divergent changesets will result in multiple successors sets, i.e. [(A',),
(A'')].
If a changeset A is not obsolete, then it will conceptually have no
successors set. To distinguish this from a pruned changeset, the successor
set will contain itself only, i.e. [(A,)].
Finally, successors unknown locally are considered to be pruned (obsoleted
without any successors).
The optional `cache` parameter is a dictionary that may contain precomputed
successors sets. It is meant to reuse the computation of a previous call to
`successorssets` when multiple calls are made at the same time. The cache
dictionary is updated in place. The caller is responsible for its life
span. Code that makes multiple calls to `successorssets` *must* use this
cache mechanism or suffer terrible performance.
ii c s@ s' | ] } | r t | | f Vq d S( N( R ( R R/ ( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pys <genexpr>* s RF c S@ s t | d S( Ni ( R ( t x( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt <lambda>+ s R N( R R R R! t removeR R$ RZ R R R; R t issubsetR ( R t initialnodet cachet succmarkerst toproceedt
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c @ s f d } | S( sA Decorator to register a function as computing the cache for a setc @ s t k s t | t <| S( N( t
cachefuncst AssertionError( t func( t name( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt decorator; s
( ( R, R- ( ( R, s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt cachefor9 s c C@ sY | j } | j s t S| | j j k rK t | | | j j | <n | j j | S( sy Return the set of revision that belong to the <name> set
Such access may compute the set and cache it for future use( R R t frozensetR R) ( R R, ( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt getrevsA s c C@ s& d | j k r" | j j j n d S( s Remove all obsolescence related cache from a repo
This remove all cache in obsstore is the obsstore already exist on the
repo.
(We could be smarter here given the exact event that trigger the cache
clearing)R N( t
_filecacheR R R ( R ( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt clearobscachesR s t obsoletec C@ sa t } | j j } | j d } x6 | D]. } | | | j j k r+ | j | q+ q+ W| S( s the set of obsolete revisionss not public()( R R R t revsR R R ( R t obst getnodet notpublict r( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt _computeobsoleteset^ s
t unstablec @ s g | j d D] } | j | f ^ q } | j d d t xF | D]> \ } } t f d | j D rQ j | qQ qQ W S( s7 the set of non obsolete revisions with obsolete parentss# (not public()) and (not obsolete())RF c S@ s | d S( Ni ( ( R ( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyR n s c 3@ s- | ]# } | j p$ | j k Vq d S( N( R3 t rev( R R ( R: ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pys <genexpr>s s ( R R; R t anyR3 R ( R R R4 R; ( ( R: s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt _computeunstableseti s + t suspendedc @ s> | j j t | d t f d t | d D S( s9 the set of obsolete parents with non obsolete descendantsR: c 3@ s! | ] } | k r | Vq d S( N( ( R R8 ( R> ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pys <genexpr>| s R3 ( R t ancestorsR0 R ( R ( ( R> s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt _computesuspendedsetx s t extinctc C@ s t | d t | d S( s< the set of obsolete parents without non obsolete descendantsR3 R> ( R0 ( R ( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt _computeextinctset~ s t bumpedc C@ s t } | j j } t j } | j } | j j } x | j d D] } | j } | j } xa t
| j | g d t D]D } | | }
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| j d D] } | j j | j d } t | } t } x | r | j d } | | k r qa n | j | | | k r t | | | n g | | D] } | r | ^ q }
t |
d k r| j | j Pn | j
| j j | d qa Wq( W| S( sM the set of rev that compete to be the final successors of some revision.
s (not public()) - obsolete()i i ( ( ( R R R R R R R R( R R; R ( R RM R t newermapR R t toprocessR Rk R t newer( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt _computedivergentset s(
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| j j | | | | d |
d
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| j j qiW| j Wd | j Xd S( sq Add obsolete markers between changesets in a repo
<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,
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.
t users add-obsolescence-markeri i i s$ cannot obsolete public changeset: %st hints see 'hg help phases' for detailsc s@ s | ] } | j Vq d S( N( R ( R R/ ( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pys <genexpr> s c s@ s | ] } | j Vq d S( N( R ( R R ( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pys <genexpr> s s# changeset %s cannot obsolete itselfR3 R R0 N( R! R t usernameR t copyR R R R R R R R" R3 RZ R R t filteredrevcacheR R R ( R t relationsR R R0 R t
markerargst relRk R. t
localmetadatat nprect nsucst nparet args( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyR sB
c C@ s t | j j d d } d | k r+ t St | d k rG t rG t St | k s_ t | k r t | k r t j
t d n | | k S( sT Returns True if the given repository has the given obsolete option
enabled.
t experimentalt evolutiont alli sU 'createmarkers' obsolete option must be enabled if other obsolete options are enabled( R R t
configlistR R t _enabledt allowunstableoptt exchangeoptt createmarkersoptR R R ( R t optiont result( ( s6 /usr/lib/python2.7/dist-packages/mercurial/obsolete.pyt isenabled s (Y R t
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