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All +communication is in pkt-line format (see technical/protocol-common.txt) +over standard input and standard output.</p></div> +</div> +</div> +<div class="sect1"> +<h2 id="_handshake">Handshake</h2> +<div class="sectionbody"> +<div class="paragraph"><p>Git starts by sending a welcome message (for example, +"git-filter-client"), a list of supported protocol version numbers, and +a flush packet. Git expects to read the welcome message with "server" +instead of "client" (for example, "git-filter-server"), exactly one +protocol version number from the previously sent list, and a flush +packet. All further communication will be based on the selected version. +The remaining protocol description below documents "version=2". Please +note that "version=42" in the example below does not exist and is only +there to illustrate how the protocol would look like with more than one +version.</p></div> +<div class="paragraph"><p>After the version negotiation Git sends a list of all capabilities that +it supports and a flush packet. Git expects to read a list of desired +capabilities, which must be a subset of the supported capabilities list, +and a flush packet as response:</p></div> +<div class="listingblock"> +<div class="content"> +<pre><code>packet: git> git-filter-client +packet: git> version=2 +packet: git> version=42 +packet: git> 0000 +packet: git< git-filter-server +packet: git< version=2 +packet: git< 0000 +packet: git> capability=clean +packet: git> capability=smudge +packet: git> capability=not-yet-invented +packet: git> 0000 +packet: git< capability=clean +packet: git< capability=smudge +packet: git< 0000</code></pre> +</div></div> +</div> +</div> +<div class="sect1"> +<h2 id="_shutdown">Shutdown</h2> +<div class="sectionbody"> +<div class="paragraph"><p>Git will close +the command pipe on exit. The filter is expected to detect EOF +and exit gracefully on its own. Git will wait until the filter +process has stopped.</p></div> +</div> +</div> +</div> +<div id="footnotes"><hr /></div> +<div id="footer"> +<div id="footer-text"> +Last updated + 2018-02-13 17:28:38 PST +</div> +</div> +</body> +</html> diff --git a/technical/long-running-process-protocol.txt b/technical/long-running-process-protocol.txt new file mode 100644 index 0000000..aa0aa9a --- /dev/null +++ b/technical/long-running-process-protocol.txt
@@ -0,0 +1,50 @@ +Long-running process protocol +============================= + +This protocol is used when Git needs to communicate with an external +process throughout the entire life of a single Git command. All +communication is in pkt-line format (see technical/protocol-common.txt) +over standard input and standard output. + +Handshake +--------- + +Git starts by sending a welcome message (for example, +"git-filter-client"), a list of supported protocol version numbers, and +a flush packet. Git expects to read the welcome message with "server" +instead of "client" (for example, "git-filter-server"), exactly one +protocol version number from the previously sent list, and a flush +packet. All further communication will be based on the selected version. +The remaining protocol description below documents "version=2". Please +note that "version=42" in the example below does not exist and is only +there to illustrate how the protocol would look like with more than one +version. + +After the version negotiation Git sends a list of all capabilities that +it supports and a flush packet. Git expects to read a list of desired +capabilities, which must be a subset of the supported capabilities list, +and a flush packet as response: +------------------------ +packet: git> git-filter-client +packet: git> version=2 +packet: git> version=42 +packet: git> 0000 +packet: git< git-filter-server +packet: git< version=2 +packet: git< 0000 +packet: git> capability=clean +packet: git> capability=smudge +packet: git> capability=not-yet-invented +packet: git> 0000 +packet: git< capability=clean +packet: git< capability=smudge +packet: git< 0000 +------------------------ + +Shutdown +-------- + +Git will close +the command pipe on exit. The filter is expected to detect EOF +and exit gracefully on its own. Git will wait until the filter +process has stopped.
diff --git a/technical/pack-protocol.html b/technical/pack-protocol.html index 4ae9b60..cc722a6 100644 --- a/technical/pack-protocol.html +++ b/technical/pack-protocol.html
@@ -992,6 +992,7 @@ <pre><code> upload-request = want-list *shallow-line *1depth-request + [filter-request] flush-pkt want-list = first-want @@ -1006,7 +1007,9 @@ first-want = PKT-LINE("want" SP obj-id SP capability-list) additional-want = PKT-LINE("want" SP obj-id) - depth = 1*DIGIT</code></pre> + depth = 1*DIGIT + + filter-request = PKT-LINE("filter" SP filter-spec)</code></pre> </div></div> <div class="paragraph"><p>Clients MUST send all the obj-ids it wants from the reference discovery phase as <em>want</em> lines. Clients MUST send at least one @@ -1025,6 +1028,10 @@ complete those commits. Commits whose parents are not received as a result are defined as shallow and marked as such in the server. This information is sent back to the client in the next step.</p></div> +<div class="paragraph"><p>The client can optionally request that pack-objects omit various +objects from the packfile using one of several filtering techniques. +These are intended for use with partial clone and partial fetch +operations. See <code>rev-list</code> for possible "filter-spec" values.</p></div> <div class="paragraph"><p>Once all the <em>want’s and 'shallow’s (and optional 'deepen</em>) are transferred, clients MUST send a flush-pkt, to tell the server side that it is done sending the list.</p></div> @@ -1425,7 +1432,7 @@ <div id="footer"> <div id="footer-text"> Last updated - 2018-01-26 15:11:04 PST + 2018-02-13 17:28:38 PST </div> </div> </body> diff --git a/technical/pack-protocol.txt b/technical/pack-protocol.txt index cd31edc..7fee6b7 100644 --- a/technical/pack-protocol.txt +++ b/technical/pack-protocol.txt
@@ -241,6 +241,7 @@ upload-request = want-list *shallow-line *1depth-request + [filter-request] flush-pkt want-list = first-want @@ -256,6 +257,8 @@ additional-want = PKT-LINE("want" SP obj-id) depth = 1*DIGIT + + filter-request = PKT-LINE("filter" SP filter-spec) ---- Clients MUST send all the obj-ids it wants from the reference @@ -278,6 +281,11 @@ result are defined as shallow and marked as such in the server. This information is sent back to the client in the next step. +The client can optionally request that pack-objects omit various +objects from the packfile using one of several filtering techniques. +These are intended for use with partial clone and partial fetch +operations. See `rev-list` for possible "filter-spec" values. + Once all the 'want's and 'shallow's (and optional 'deepen') are transferred, clients MUST send a flush-pkt, to tell the server side that it is done sending the list. diff --git a/technical/protocol-capabilities.html b/technical/protocol-capabilities.html index 2fa2af7..9f726f3 100644 --- a/technical/protocol-capabilities.html +++ b/technical/protocol-capabilities.html
@@ -1049,12 +1049,21 @@ this capability.</p></div> </div> </div> +<div class="sect1"> +<h2 id="_filter">filter</h2> +<div class="sectionbody"> +<div class="paragraph"><p>If the upload-pack server advertises the <em>filter</em> capability, +fetch-pack may send "filter" commands to request a partial clone +or partial fetch and request that the server omit various objects +from the packfile.</p></div> +</div> +</div> </div> <div id="footnotes"><hr /></div> <div id="footer"> <div id="footer-text"> Last updated - 2018-01-26 15:11:04 PST + 2018-02-13 17:28:38 PST </div> </div> </body>
diff --git a/technical/protocol-capabilities.txt b/technical/protocol-capabilities.txt index 26dcc6f..332d209 100644 --- a/technical/protocol-capabilities.txt +++ b/technical/protocol-capabilities.txt
@@ -309,3 +309,11 @@ included in the push certificate. A send-pack client MUST NOT send a push-cert packet unless the receive-pack server advertises this capability. + +filter +------ + +If the upload-pack server advertises the 'filter' capability, +fetch-pack may send "filter" commands to request a partial clone +or partial fetch and request that the server omit various objects +from the packfile.
diff --git a/technical/repository-version.txt b/technical/repository-version.txt index 00ad379..e03eacc 100644 --- a/technical/repository-version.txt +++ b/technical/repository-version.txt
@@ -86,3 +86,15 @@ When the config key `extensions.preciousObjects` is set to `true`, objects in the repository MUST NOT be deleted (e.g., by `git-prune` or `git repack -d`). + +`partialclone` +~~~~~~~~~~~~~~ + +When the config key `extensions.partialclone` is set, it indicates +that the repo was created with a partial clone (or later performed +a partial fetch) and that the remote may have omitted sending +certain unwanted objects. Such a remote is called a "promisor remote" +and it promises that all such omitted objects can be fetched from it +in the future. + +The value of this key is the name of the promisor remote.
