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The active mergestate is stored in ``.hg/merge`` when a merge is triggered
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by commands like ``hg merge``, ``hg rebase``, etc. until the merge is
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completed or aborted to track the 3-way merge state of individual files.
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The contents of the directory are:
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Conflicting files
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-----------------
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The local version of the conflicting files are stored with their
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filenames as the hash of their paths.
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state
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-----
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This mergestate file record is used by hg version prior to 2.9.1
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and contains less data than ``state2``. If there is no contradiction
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with ``state2``, we can assume that both are written at the same time.
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In this case, data from ``state2`` is used. Otherwise, we use ``state``.
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We read/write both ``state`` and ``state2`` records to ensure backward
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compatibility.
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state2
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------
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This record stores a superset of data in ``state``, including new kinds
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of records in the future.
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Each record can contain arbitrary content and has an associated type. This
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`type` should be a letter. If `type` is uppercase, the record is mandatory:
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versions of Mercurial that don't support it should abort. If `type` is
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lowercase, the record can be safely ignored.
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Currently known records:
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| * L: the node of the "local" part of the merge (hexified version)
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| * O: the node of the "other" part of the merge (hexified version)
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| * F: a file to be merged entry
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| * C: a change/delete or delete/change conflict
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| * P: a path conflict (file vs directory)
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| * f: a (filename, dictionary) tuple of optional values for a given file
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| * X: unsupported mandatory record type (used in tests)
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| * x: unsupported advisory record type (used in tests)
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| * l: the labels for the parts of the merge.
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Merge record states (indexed by filename):
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| * u: unresolved conflict
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| * r: resolved conflict
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| * pu: unresolved path conflict (file conflicts with directory)
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| * pr: resolved path conflict
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The resolve command transitions between 'u' and 'r' for conflicts and
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'pu' and 'pr' for path conflicts.
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This format is a list of arbitrary records of the form:
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[type][length][content]
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`type` is a single character, `length` is a 4 byte integer, and
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`content` is an arbitrary byte sequence of length `length`.
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Mercurial versions prior to 3.7 have a bug where if there are
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unsupported mandatory merge records, attempting to clear out the merge
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state with hg update --clean or similar aborts. The 't' record type
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works around that by writing out what those versions treat as an
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advisory record, but later versions interpret as special: the first
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character is the 'real' record type and everything onwards is the data.
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