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# narrowrevlog.py - revlog storing irrelevant nodes as "ellipsis" nodes
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#
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# Copyright 2017 Google, Inc.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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from mercurial import (
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revlog,
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util,
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)
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def readtransform(self, text):
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return text, False
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def writetransform(self, text):
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return text, False
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def rawtransform(self, text):
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return False
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revlog.addflagprocessor(revlog.REVIDX_ELLIPSIS,
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(readtransform, writetransform, rawtransform))
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def setup():
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# We just wanted to add the flag processor, which is done at module
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# load time.
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pass
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def makenarrowfilelog(fl, narrowmatch):
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class narrowfilelog(fl.__class__):
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def renamed(self, node):
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# Renames that come from outside the narrowspec are
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# problematic at least for git-diffs, because we lack the
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# base text for the rename. This logic was introduced in
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# 3cd72b1 of narrowhg (authored by martinvonz, reviewed by
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# adgar), but that revision doesn't have any additional
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# commentary on what problems we can encounter.
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m = super(narrowfilelog, self).renamed(node)
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if m and not narrowmatch(m[0]):
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return None
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return m
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def size(self, rev):
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# We take advantage of the fact that remotefilelog
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# lacks a node() method to just skip the
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# rename-checking logic when on remotefilelog. This
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# might be incorrect on other non-revlog-based storage
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# engines, but for now this seems to be fine.
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#
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# TODO: when remotefilelog is in core, improve this to
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# explicitly look for remotefilelog instead of cheating
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# with a hasattr check.
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if util.safehasattr(self, 'node'):
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node = self.node(rev)
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# Because renamed() is overridden above to
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# sometimes return None even if there is metadata
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# in the revlog, size can be incorrect for
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# copies/renames, so we need to make sure we call
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# the super class's implementation of renamed()
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# for the purpose of size calculation.
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if super(narrowfilelog, self).renamed(node):
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return len(self.read(node))
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return super(narrowfilelog, self).size(rev)
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def cmp(self, node, text):
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different = super(narrowfilelog, self).cmp(node, text)
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if different:
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# Similar to size() above, if the file was copied from
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# a file outside the narrowspec, the super class's
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# would have returned True because we tricked it into
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# thinking that the file was not renamed.
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if super(narrowfilelog, self).renamed(node):
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t2 = self.read(node)
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return t2 != text
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return different
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fl.__class__ = narrowfilelog
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