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revlog: replace revlog._io.size with a new revlog.index.entry_size...
revlog: replace revlog._io.size with a new revlog.index.entry_size The `revlogio` class is mostly a relic from the past. Once in charge of the full revlog related Input/Output code, that class gradually lost responsibilities to the point where more IO are now done by `revlog.index` objects or revlog objects themself. I would like to ultimately remove the `revlogio` class, to do so I start simple with move the "entry size" information on the index. (The index is already responsible of the binary unpacking, so it knows the size. Differential Revision: https://phab.mercurial-scm.org/D10309
Matt Harbison - - Load All Authors

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censor.txt
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/ mercurial / helptext / internals / censor.txt
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The censor system allows retroactively removing content from
files. Actually censoring a node requires using the censor extension,
but the functionality for handling censored nodes is partially in core.
Censored nodes in a filelog have the flag ``REVIDX_ISCENSORED`` set,
and the contents of the censored node are replaced with a censor
tombstone. For historical reasons, the tombstone is packed in the
filelog metadata field ``censored``. This allows censored nodes to be
(mostly) safely transmitted through old formats like changegroup
versions 1 and 2. When using changegroup formats older than 3, the
receiver is required to re-add the ``REVIDX_ISCENSORED`` flag when
storing the revision. This depends on the ``censored`` metadata key
never being used for anything other than censoring revisions, which is
true as of January 2017. Note that the revlog flag is the
authoritative marker of a censored node: the tombstone should only be
consulted when looking for a reason a node was censored or when revlog
flags are unavailable as mentioned above.
The tombstone data is a free-form string. It's expected that users of
censor will want to record the reason for censoring a node in the
tombstone. Censored nodes must be able to fit in the size of the
content being censored.