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**Experimental and under active development**
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This section documents the wire protocol commands exposed to transports
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using the frame-based protocol. The set of commands exposed through
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these transports is distinct from the set of commands exposed to legacy
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transports.
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The frame-based protocol uses CBOR to encode command execution requests.
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All command arguments must be mapped to a specific or set of CBOR data
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types.
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The response to many commands is also CBOR. There is no common response
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format: each command defines its own response format.
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TODOs
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=====
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* Add "node namespace" support to each command. In order to support
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SHA-1 hash transition, we want servers to be able to expose different
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"node namespaces" for the same data. Every command operating on nodes
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should specify which "node namespace" it is operating on and responses
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should encode the "node namespace" accordingly.
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Commands
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========
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The sections below detail all commands available to wire protocol version
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2.
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branchmap
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---------
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Obtain heads in named branches.
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Receives no arguments.
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The response is a map with bytestring keys defining the branch name.
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Values are arrays of bytestring defining raw changeset nodes.
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capabilities
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------------
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Obtain the server's capabilities.
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Receives no arguments.
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This command is typically called only as part of the handshake during
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initial connection establishment.
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The response is a map with bytestring keys defining server information.
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The defined keys are:
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commands
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A map defining available wire protocol commands on this server.
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Keys in the map are the names of commands that can be invoked. Values
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are maps defining information about that command. The bytestring keys
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are:
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args
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(map) Describes arguments accepted by the command.
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Keys are bytestrings denoting the argument name.
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Values are maps describing the argument. The map has the following
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bytestring keys:
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default
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(varied) The default value for this argument if not specified. Only
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present if ``required`` is not true.
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required
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(boolean) Whether the argument must be specified. Failure to send
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required arguments will result in an error executing the command.
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type
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(bytestring) The type of the argument. e.g. ``bytes`` or ``bool``.
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validvalues
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(set) Values that are recognized for this argument. Some arguments
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only allow a fixed set of values to be specified. These arguments
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may advertise that set in this key. If this set is advertised and
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a value not in this set is specified, the command should result
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in error.
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permissions
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An array of permissions required to execute this command.
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*
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(various) Individual commands may define extra keys that supplement
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generic command metadata. See the command definition for more.
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framingmediatypes
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An array of bytestrings defining the supported framing protocol
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media types. Servers will not accept media types not in this list.
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pathfilterprefixes
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(set of bytestring) Matcher prefixes that are recognized when performing
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path filtering. Specifying a path filter whose type/prefix does not
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match one in this set will likely be rejected by the server.
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rawrepoformats
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An array of storage formats the repository is using. This set of
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requirements can be used to determine whether a client can read a
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*raw* copy of file data available.
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redirect
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A map declaring potential *content redirects* that may be used by this
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server. Contains the following bytestring keys:
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targets
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(array of maps) Potential redirect targets. Values are maps describing
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this target in more detail. Each map has the following bytestring keys:
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name
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(bytestring) Identifier for this target. The identifier will be used
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by clients to uniquely identify this target.
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protocol
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(bytestring) High-level network protocol. Values can be
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``http``, ```https``, ``ssh``, etc.
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uris
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(array of bytestrings) Representative URIs for this target.
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snirequired (optional)
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(boolean) Indicates whether Server Name Indication is required
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to use this target. Defaults to False.
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tlsversions (optional)
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(array of bytestring) Indicates which TLS versions are supported by
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this target. Values are ``1.1``, ``1.2``, ``1.3``, etc.
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hashes
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(array of bytestring) Indicates support for hashing algorithms that are
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used to ensure content integrity. Values include ``sha1``, ``sha256``,
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etc.
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changesetdata
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-------------
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Obtain various data related to changesets.
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The command accepts the following arguments:
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revisions
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(array of maps) Specifies revisions whose data is being requested. Each
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value in the array is a map describing revisions. See the
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*Revisions Specifiers* section below for the format of this map.
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Data will be sent for the union of all revisions resolved by all
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revision specifiers.
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Only revision specifiers operating on changeset revisions are allowed.
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fields
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(set of bytestring) Which data associated with changelog revisions to
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fetch. The following values are recognized:
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bookmarks
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Bookmarks associated with a revision.
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parents
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Parent revisions.
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phase
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The phase state of a revision.
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revision
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The raw, revision data for the changelog entry. The hash of this data
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will match the revision's node value.
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The response bytestream starts with a CBOR map describing the data that follows.
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This map has the following bytestring keys:
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totalitems
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(unsigned integer) Total number of changelog revisions whose data is being
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transferred. This maps to the set of revisions in the requested node
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range, not the total number of records that follow (see below for why).
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Following the map header is a series of 0 or more CBOR values. If values
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are present, the first value will always be a map describing a single changeset
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revision.
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If the ``fieldsfollowing`` key is present, the map will immediately be followed
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by N CBOR bytestring values, where N is the number of elements in
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``fieldsfollowing``. Each bytestring value corresponds to a field denoted
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by ``fieldsfollowing``.
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Following the optional bytestring field values is the next revision descriptor
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map, or end of stream.
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Each revision descriptor map has the following bytestring keys:
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node
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(bytestring) The node value for this revision. This is the SHA-1 hash of
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the raw revision data.
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bookmarks (optional)
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(array of bytestrings) Bookmarks attached to this revision. Only present
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if ``bookmarks`` data is being requested and the revision has bookmarks
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attached.
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fieldsfollowing (optional)
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(array of 2-array) Denotes what fields immediately follow this map. Each
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value is an array with 2 elements: the bytestring field name and an unsigned
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integer describing the length of the data, in bytes.
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If this key isn't present, no special fields will follow this map.
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The following fields may be present:
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revision
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Raw, revision data for the changelog entry. Contains a serialized form
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of the changeset data, including the author, date, commit message, set
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of changed files, manifest node, and other metadata.
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Only present if the ``revision`` field was requested.
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parents (optional)
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(array of bytestrings) The nodes representing the parent revisions of this
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revision. Only present if ``parents`` data is being requested.
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phase (optional)
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(bytestring) The phase that a revision is in. Recognized values are
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``secret``, ``draft``, and ``public``. Only present if ``phase`` data
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is being requested.
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The set of changeset revisions emitted may not match the exact set of
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changesets requested. Furthermore, the set of keys present on each
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map may vary. This is to facilitate emitting changeset updates as well
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as new revisions.
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For example, if the request wants ``phase`` and ``revision`` data,
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the response may contain entries for each changeset in the common nodes
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set with the ``phase`` key and without the ``revision`` key in order
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to reflect a phase-only update.
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TODO support different revision selection mechanisms (e.g. non-public, specific
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revisions)
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TODO support different hash "namespaces" for revisions (e.g. sha-1 versus other)
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TODO support emitting obsolescence data
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TODO support filtering based on relevant paths (narrow clone)
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TODO support hgtagsfnodes cache / tags data
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TODO support branch heads cache
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TODO consider unify query mechanism. e.g. as an array of "query descriptors"
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rather than a set of top-level arguments that have semantics when combined.
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filedata
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--------
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Obtain various data related to an individual tracked file.
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The command accepts the following arguments:
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fields
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(set of bytestring) Which data associated with a file to fetch.
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The following values are recognized:
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linknode
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The changeset node introducing this revision.
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parents
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Parent nodes for the revision.
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revision
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The raw revision data for a file.
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haveparents
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(bool) Whether the client has the parent revisions of all requested
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nodes. If set, the server may emit revision data as deltas against
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any parent revision. If not set, the server MUST only emit deltas for
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revisions previously emitted by this command.
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False is assumed in the absence of any value.
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nodes
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(array of bytestrings) File nodes whose data to retrieve.
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path
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(bytestring) Path of the tracked file whose data to retrieve.
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TODO allow specifying revisions via alternate means (such as from
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changeset revisions or ranges)
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The response bytestream starts with a CBOR map describing the data that
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follows. It has the following bytestream keys:
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totalitems
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(unsigned integer) Total number of file revisions whose data is
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being returned.
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Following the map header is a series of 0 or more CBOR values. If values
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are present, the first value will always be a map describing a single changeset
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revision.
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If the ``fieldsfollowing`` key is present, the map will immediately be followed
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by N CBOR bytestring values, where N is the number of elements in
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``fieldsfollowing``. Each bytestring value corresponds to a field denoted
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by ``fieldsfollowing``.
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Following the optional bytestring field values is the next revision descriptor
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map, or end of stream.
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Each revision descriptor map has the following bytestring keys:
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Each map has the following bytestring keys:
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node
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(bytestring) The node of the file revision whose data is represented.
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deltabasenode
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(bytestring) Node of the file revision the following delta is against.
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Only present if the ``revision`` field is requested and delta data
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follows this map.
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fieldsfollowing
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(array of 2-array) Denotes extra bytestring fields that following this map.
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See the documentation for ``changesetdata`` for semantics.
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The following named fields may be present:
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``delta``
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The delta data to use to construct the fulltext revision.
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Only present if the ``revision`` field is requested and a delta is
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being emitted. The ``deltabasenode`` top-level key will also be
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present if this field is being emitted.
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``revision``
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The fulltext revision data for this manifest. Only present if the
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``revision`` field is requested and a fulltext revision is being emitted.
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parents
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(array of bytestring) The nodes of the parents of this file revision.
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Only present if the ``parents`` field is requested.
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When ``revision`` data is requested, the server chooses to emit either fulltext
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revision data or a delta. What the server decides can be inferred by looking
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for the presence of the ``delta`` or ``revision`` keys in the
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``fieldsfollowing`` array.
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filesdata
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---------
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Obtain various data related to multiple tracked files for specific changesets.
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This command is similar to ``filedata`` with the main difference being that
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individual requests operate on multiple file paths. This allows clients to
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request data for multiple paths by issuing a single command.
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The command accepts the following arguments:
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fields
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(set of bytestring) Which data associated with a file to fetch.
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The following values are recognized:
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linknode
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The changeset node introducing this revision.
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parents
|
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Parent nodes for the revision.
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revision
|
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The raw revision data for a file.
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haveparents
|
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(bool) Whether the client has the parent revisions of all requested
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nodes.
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pathfilter
|
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(map) Defines a filter that determines what file paths are relevant.
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See the *Path Filters* section for more.
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If the argument is omitted, it is assumed that all paths are relevant.
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revisions
|
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(array of maps) Specifies revisions whose data is being requested. Each value
|
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in the array is a map describing revisions. See the *Revisions Specifiers*
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section below for the format of this map.
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Data will be sent for the union of all revisions resolved by all revision
|
|
|
specifiers.
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Only revision specifiers operating on changeset revisions are allowed.
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The response bytestream starts with a CBOR map describing the data that
|
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follows. This map has the following bytestring keys:
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totalpaths
|
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(unsigned integer) Total number of paths whose data is being transferred.
|
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totalitems
|
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(unsigned integer) Total number of file revisions whose data is being
|
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transferred.
|
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|
Following the map header are 0 or more sequences of CBOR values. Each sequence
|
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represents data for a specific tracked path. Each sequence begins with a CBOR
|
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map describing the file data that follows. Following that map is N CBOR values
|
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describing file revision data. The format of this data is identical to that
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returned by the ``filedata`` command.
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Each sequence's map header has the following bytestring keys:
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path
|
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(bytestring) The tracked file path whose data follows.
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totalitems
|
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(unsigned integer) Total number of file revisions whose data is being
|
|
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transferred.
|
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|
|
|
The ``haveparents`` argument has significant implications on the data
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transferred.
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|
|
When ``haveparents`` is true, the command MAY only emit data for file
|
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revisions introduced by the set of changeset revisions whose data is being
|
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requested. In other words, the command may assume that all file revisions
|
|
|
for all relevant paths for ancestors of the requested changeset revisions
|
|
|
are present on the receiver.
|
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|
|
When ``haveparents`` is false, the command MUST assume that the receiver
|
|
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has no file revisions data. This means that all referenced file revisions
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in the queried set of changeset revisions will be sent.
|
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|
|
TODO we want a more complicated mechanism for the client to specify which
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|
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ancestor revisions are known. This is needed so intelligent deltas can be
|
|
|
emitted and so updated linknodes can be sent if the client needs to adjust
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|
|
its linknodes for existing file nodes to older changeset revisions.
|
|
|
TODO we may want to make linknodes an array so multiple changesets can be
|
|
|
marked as introducing a file revision, since this can occur with e.g. hidden
|
|
|
changesets.
|
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|
heads
|
|
|
-----
|
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|
|
|
Obtain DAG heads in the repository.
|
|
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|
|
|
The command accepts the following arguments:
|
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|
|
publiconly (optional)
|
|
|
(boolean) If set, operate on the DAG for public phase changesets only.
|
|
|
Non-public (i.e. draft) phase DAG heads will not be returned.
|
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|
|
The response is a CBOR array of bytestrings defining changeset nodes
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|
|
of DAG heads. The array can be empty if the repository is empty or no
|
|
|
changesets satisfied the request.
|
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|
|
|
TODO consider exposing phase of heads in response
|
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|
|
known
|
|
|
-----
|
|
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|
|
|
Determine whether a series of changeset nodes is known to the server.
|
|
|
|
|
|
The command accepts the following arguments:
|
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|
|
|
nodes
|
|
|
(array of bytestrings) List of changeset nodes whose presence to
|
|
|
query.
|
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|
|
The response is a bytestring where each byte contains a 0 or 1 for the
|
|
|
corresponding requested node at the same index.
|
|
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|
|
|
TODO use a bit array for even more compact response
|
|
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|
|
|
listkeys
|
|
|
--------
|
|
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|
|
|
List values in a specified ``pushkey`` namespace.
|
|
|
|
|
|
The command receives the following arguments:
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namespace
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(bytestring) Pushkey namespace to query.
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The response is a map with bytestring keys and values.
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TODO consider using binary to represent nodes in certain pushkey namespaces.
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lookup
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------
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Try to resolve a value to a changeset revision.
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Unlike ``known`` which operates on changeset nodes, lookup operates on
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node fragments and other names that a user may use.
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The command receives the following arguments:
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key
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(bytestring) Value to try to resolve.
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On success, returns a bytestring containing the resolved node.
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manifestdata
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------------
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Obtain various data related to manifests (which are lists of files in
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a revision).
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The command accepts the following arguments:
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fields
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(set of bytestring) Which data associated with manifests to fetch.
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The following values are recognized:
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parents
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Parent nodes for the manifest.
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revision
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The raw revision data for the manifest.
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haveparents
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(bool) Whether the client has the parent revisions of all requested
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nodes. If set, the server may emit revision data as deltas against
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any parent revision. If not set, the server MUST only emit deltas for
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revisions previously emitted by this command.
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False is assumed in the absence of any value.
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nodes
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(array of bytestring) Manifest nodes whose data to retrieve.
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tree
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(bytestring) Path to manifest to retrieve. The empty bytestring represents
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the root manifest. All other values represent directories/trees within
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the repository.
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TODO allow specifying revisions via alternate means (such as from changeset
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revisions or ranges)
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TODO consider recursive expansion of manifests (with path filtering for
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narrow use cases)
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The response bytestream starts with a CBOR map describing the data that
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follows. It has the following bytestring keys:
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totalitems
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(unsigned integer) Total number of manifest revisions whose data is
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being returned.
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Following the map header is a series of 0 or more CBOR values. If values
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are present, the first value will always be a map describing a single manifest
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revision.
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If the ``fieldsfollowing`` key is present, the map will immediately be followed
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by N CBOR bytestring values, where N is the number of elements in
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``fieldsfollowing``. Each bytestring value corresponds to a field denoted
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by ``fieldsfollowing``.
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Following the optional bytestring field values is the next revision descriptor
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map, or end of stream.
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Each revision descriptor map has the following bytestring keys:
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node
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(bytestring) The node of the manifest revision whose data is represented.
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deltabasenode
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(bytestring) The node that the delta representation of this revision is
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computed against. Only present if the ``revision`` field is requested and
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a delta is being emitted.
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fieldsfollowing
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(array of 2-array) Denotes extra bytestring fields that following this map.
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See the documentation for ``changesetdata`` for semantics.
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The following named fields may be present:
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``delta``
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The delta data to use to construct the fulltext revision.
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Only present if the ``revision`` field is requested and a delta is
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being emitted. The ``deltabasenode`` top-level key will also be
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present if this field is being emitted.
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``revision``
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The fulltext revision data for this manifest. Only present if the
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``revision`` field is requested and a fulltext revision is being emitted.
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parents
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(array of bytestring) The nodes of the parents of this manifest revision.
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Only present if the ``parents`` field is requested.
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When ``revision`` data is requested, the server chooses to emit either fulltext
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revision data or a delta. What the server decides can be inferred by looking
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for the presence of ``delta`` or ``revision`` in the ``fieldsfollowing`` array.
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Servers MAY advertise the following extra fields in the capabilities
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descriptor for this command:
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recommendedbatchsize
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(unsigned integer) Number of revisions the server recommends as a batch
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query size. If defined, clients needing to issue multiple ``manifestdata``
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commands to obtain needed data SHOULD construct their commands to have
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this many revisions per request.
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pushkey
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-------
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Set a value using the ``pushkey`` protocol.
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The command receives the following arguments:
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namespace
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(bytestring) Pushkey namespace to operate on.
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key
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(bytestring) The pushkey key to set.
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old
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(bytestring) Old value for this key.
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new
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(bytestring) New value for this key.
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TODO consider using binary to represent nodes is certain pushkey namespaces.
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TODO better define response type and meaning.
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rawstorefiledata
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----------------
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Allows retrieving raw files used to store repository data.
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The command accepts the following arguments:
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files
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(array of bytestring) Describes the files that should be retrieved.
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The meaning of values in this array is dependent on the storage backend used
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by the server.
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The response bytestream starts with a CBOR map describing the data that follows.
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This map has the following bytestring keys:
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filecount
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(unsigned integer) Total number of files whose data is being transferred.
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totalsize
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(unsigned integer) Total size in bytes of files data that will be
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transferred. This is file on-disk size and not wire size.
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Following the map header are N file segments. Each file segment consists of a
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CBOR map followed by an indefinite length bytestring. Each map has the following
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bytestring keys:
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location
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(bytestring) Denotes the location in the repository where the file should be
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written. Values map to vfs instances to use for the writing.
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path
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(bytestring) Path of file being transferred. Path is the raw store
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path and can be any sequence of bytes that can be tracked in a Mercurial
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manifest.
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size
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(unsigned integer) Size of file data. This will be the final written
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file size. The total size of the data that follows the CBOR map
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will be greater due to encoding overhead of CBOR.
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TODO this command is woefully incomplete. If we are to move forward with a
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stream clone analog, it needs a lot more metadata around how to describe what
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files are available to retrieve, other semantics.
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Revision Specifiers
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===================
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A *revision specifier* is a map that evaluates to a set of revisions.
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A *revision specifier* has a ``type`` key that defines the revision
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selection type to perform. Other keys in the map are used in a
|
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type-specific manner.
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The following types are defined:
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changesetexplicit
|
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An explicit set of enumerated changeset revisions.
|
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The ``nodes`` key MUST contain an array of full binary nodes, expressed
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as bytestrings.
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changesetexplicitdepth
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Like ``changesetexplicit``, but contains a ``depth`` key defining the
|
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unsigned integer number of ancestor revisions to also resolve. For each
|
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value in ``nodes``, DAG ancestors will be walked until up to N total
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revisions from that ancestry walk are present in the final resolved set.
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changesetdagrange
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Defines revisions via a DAG range of changesets on the changelog.
|
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|
The ``roots`` key MUST contain an array of full, binary node values
|
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|
representing the *root* revisions.
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The ``heads`` key MUST contain an array of full, binary nodes values
|
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representing the *head* revisions.
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The DAG range between ``roots`` and ``heads`` will be resolved and all
|
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revisions between will be used. Nodes in ``roots`` are not part of the
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resolved set. Nodes in ``heads`` are. The ``roots`` array may be empty.
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The ``heads`` array MUST be defined.
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|
Path Filters
|
|
|
============
|
|
|
|
|
|
Various commands accept a *path filter* argument that defines the set of file
|
|
|
paths relevant to the request.
|
|
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|
|
A *path filter* is defined as a map with the bytestring keys ``include`` and
|
|
|
``exclude``. Each is an array of bytestring values. Each value defines a pattern
|
|
|
rule (see :hg:`help patterns`) that is used to match file paths.
|
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|
A path matches the path filter if it is matched by a rule in the ``include``
|
|
|
set but doesn't match a rule in the ``exclude`` set. In other words, a path
|
|
|
matcher takes the union of all ``include`` patterns and then substracts the
|
|
|
union of all ``exclude`` patterns.
|
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|
Patterns MUST be prefixed with their pattern type. Only the following pattern
|
|
|
types are allowed: ``path:``, ``rootfilesin:``.
|
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If the ``include`` key is omitted, it is assumed that all paths are
|
|
|
relevant. The patterns from ``exclude`` will still be used, if defined.
|
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|
|
An example value is ``path:tests/foo``, which would match a file named
|
|
|
``tests/foo`` or a directory ``tests/foo`` and all files under it.
|
|
|
|
