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| </head> |
| <body class="manpage"> |
| <div id="header"> |
| <h1>gitprotocol-http(5) Manual Page</h1> |
| <h2 id="_name">NAME</h2> |
| <div class="sectionbody"> |
| <p>gitprotocol-http - Git HTTP-based protocols</p> |
| </div> |
| </div> |
| <div id="content"> |
| <div class="sect1"> |
| <h2 id="_synopsis">SYNOPSIS</h2> |
| <div class="sectionbody"> |
| <div class="verseblock"> |
| <pre class="content"><over-the-wire-protocol></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_description">DESCRIPTION</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Git supports two HTTP based transfer protocols. A "dumb" protocol |
| which requires only a standard HTTP server on the server end of the |
| connection, and a "smart" protocol which requires a Git aware CGI |
| (or server module). This document describes both protocols.</p> |
| </div> |
| <div class="paragraph"> |
| <p>As a design feature smart clients can automatically upgrade "dumb" |
| protocol URLs to smart URLs. This permits all users to have the |
| same published URL, and the peers automatically select the most |
| efficient transport available to them.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_url_format">URL Format</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>URLs for Git repositories accessed by HTTP use the standard HTTP |
| URL syntax documented by RFC 1738, so they are of the form:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>http://<host>:<port>/<path>?<searchpart></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Within this documentation the placeholder <code>$GIT_URL</code> will stand for |
| the http:// repository URL entered by the end-user.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Servers SHOULD handle all requests to locations matching <code>$GIT_URL</code>, as |
| both the "smart" and "dumb" HTTP protocols used by Git operate |
| by appending additional path components onto the end of the user |
| supplied <code>$GIT_URL</code> string.</p> |
| </div> |
| <div class="paragraph"> |
| <p>An example of a dumb client requesting a loose object:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>$GIT_URL: http://example.com:8080/git/repo.git |
| URL request: http://example.com:8080/git/repo.git/objects/d0/49f6c27a2244e12041955e262a404c7faba355</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>An example of a smart request to a catch-all gateway:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>$GIT_URL: http://example.com/daemon.cgi?svc=git&q= |
| URL request: http://example.com/daemon.cgi?svc=git&q=/info/refs&service=git-receive-pack</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>An example of a request to a submodule:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>$GIT_URL: http://example.com/git/repo.git/path/submodule.git |
| URL request: http://example.com/git/repo.git/path/submodule.git/info/refs</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST strip a trailing <code>/</code>, if present, from the user supplied |
| <code>$GIT_URL</code> string to prevent empty path tokens (<code>//</code>) from appearing |
| in any URL sent to a server. Compatible clients MUST expand |
| <code>$GIT_URL/info/refs</code> as <code>foo/info/refs</code> and not <code>foo//info/refs</code>.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_authentication">Authentication</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Standard HTTP authentication is used if authentication is required |
| to access a repository, and MAY be configured and enforced by the |
| HTTP server software.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Because Git repositories are accessed by standard path components |
| server administrators MAY use directory based permissions within |
| their HTTP server to control repository access.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients SHOULD support Basic authentication as described by RFC 2617. |
| Servers SHOULD support Basic authentication by relying upon the |
| HTTP server placed in front of the Git server software.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Servers SHOULD NOT require HTTP cookies for the purposes of |
| authentication or access control.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients and servers MAY support other common forms of HTTP based |
| authentication, such as Digest authentication.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_ssl">SSL</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Clients and servers SHOULD support SSL, particularly to protect |
| passwords when relying on Basic HTTP authentication.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_session_state">Session State</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The Git over HTTP protocol (much like HTTP itself) is stateless |
| from the perspective of the HTTP server side. All state MUST be |
| retained and managed by the client process. This permits simple |
| round-robin load-balancing on the server side, without needing to |
| worry about state management.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST NOT require state management on the server side in |
| order to function correctly.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Servers MUST NOT require HTTP cookies in order to function correctly. |
| Clients MAY store and forward HTTP cookies during request processing |
| as described by RFC 2616 (HTTP/1.1). Servers SHOULD ignore any |
| cookies sent by a client.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_general_request_processing">General Request Processing</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Except where noted, all standard HTTP behavior SHOULD be assumed |
| by both client and server. This includes (but is not necessarily |
| limited to):</p> |
| </div> |
| <div class="paragraph"> |
| <p>If there is no repository at <code>$GIT_URL</code>, or the resource pointed to by a |
| location matching <code>$GIT_URL</code> does not exist, the server MUST NOT respond |
| with <code>200</code> <code>OK</code> response. A server SHOULD respond with |
| <code>404</code> <code>Not</code> <code>Found</code>, <code>410</code> <code>Gone</code>, or any other suitable HTTP status code |
| which does not imply the resource exists as requested.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If there is a repository at <code>$GIT_URL</code>, but access is not currently |
| permitted, the server MUST respond with the <code>403</code> <code>Forbidden</code> HTTP |
| status code.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Servers SHOULD support both HTTP 1.0 and HTTP 1.1. |
| Servers SHOULD support chunked encoding for both request and response |
| bodies.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients SHOULD support both HTTP 1.0 and HTTP 1.1. |
| Clients SHOULD support chunked encoding for both request and response |
| bodies.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Servers MAY return ETag and/or Last-Modified headers.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MAY revalidate cached entities by including If-Modified-Since |
| and/or If-None-Match request headers.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Servers MAY return <code>304</code> <code>Not</code> <code>Modified</code> if the relevant headers appear |
| in the request and the entity has not changed. Clients MUST treat |
| <code>304</code> <code>Not</code> <code>Modified</code> identical to <code>200</code> <code>OK</code> by reusing the cached entity.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MAY reuse a cached entity without revalidation if the |
| Cache-Control and/or Expires header permits caching. Clients and |
| servers MUST follow RFC 2616 for cache controls.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_discovering_references">Discovering References</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>All HTTP clients MUST begin either a fetch or a push exchange by |
| discovering the references available on the remote repository.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="_dumb_clients">Dumb Clients</h3> |
| <div class="paragraph"> |
| <p>HTTP clients that only support the "dumb" protocol MUST discover |
| references by making a request for the special info/refs file of |
| the repository.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Dumb HTTP clients MUST make a <code>GET</code> request to <code>$GIT_URL/info/refs</code>, |
| without any search/query parameters.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>C: GET $GIT_URL/info/refs HTTP/1.0</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>S: 200 OK |
| S: |
| S: 95dcfa3633004da0049d3d0fa03f80589cbcaf31 refs/heads/maint |
| S: d049f6c27a2244e12041955e262a404c7faba355 refs/heads/master |
| S: 2cb58b79488a98d2721cea644875a8dd0026b115 refs/tags/v1.0 |
| S: a3c2e2402b99163d1d59756e5f207ae21cccba4c refs/tags/v1.0^{}</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The Content-Type of the returned info/refs entity SHOULD be |
| <code>text/plain</code>; <code>charset=utf-8</code>, but MAY be any content type. |
| Clients MUST NOT attempt to validate the returned Content-Type. |
| Dumb servers MUST NOT return a return type starting with |
| <code>application/x-git-</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Cache-Control headers MAY be returned to disable caching of the |
| returned entity.</p> |
| </div> |
| <div class="paragraph"> |
| <p>When examining the response clients SHOULD only examine the HTTP |
| status code. Valid responses are <code>200</code> <code>OK</code>, or <code>304</code> <code>Not</code> <code>Modified</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The returned content is a UNIX formatted text file describing |
| each ref and its known value. The file SHOULD be sorted by name |
| according to the C locale ordering. The file SHOULD NOT include |
| the default ref named <code>HEAD</code>.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>info_refs = *( ref_record ) |
| ref_record = any_ref / peeled_ref</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>any_ref = obj-id HTAB refname LF |
| peeled_ref = obj-id HTAB refname LF |
| obj-id HTAB refname "^{}" LF</pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_smart_clients">Smart Clients</h3> |
| <div class="paragraph"> |
| <p>HTTP clients that support the "smart" protocol (or both the |
| "smart" and "dumb" protocols) MUST discover references by making |
| a parameterized request for the info/refs file of the repository.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The request MUST contain exactly one query parameter, |
| <code>service=$servicename</code>, where <code>$servicename</code> MUST be the service |
| name the client wishes to contact to complete the operation. |
| The request MUST NOT contain additional query parameters.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>C: GET $GIT_URL/info/refs?service=git-upload-pack HTTP/1.0</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>dumb server reply:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>S: 200 OK |
| S: |
| S: 95dcfa3633004da0049d3d0fa03f80589cbcaf31 refs/heads/maint |
| S: d049f6c27a2244e12041955e262a404c7faba355 refs/heads/master |
| S: 2cb58b79488a98d2721cea644875a8dd0026b115 refs/tags/v1.0 |
| S: a3c2e2402b99163d1d59756e5f207ae21cccba4c refs/tags/v1.0^{}</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>smart server reply:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>S: 200 OK |
| S: Content-Type: application/x-git-upload-pack-advertisement |
| S: Cache-Control: no-cache |
| S: |
| S: 001e# service=git-upload-pack\n |
| S: 0000 |
| S: 004895dcfa3633004da0049d3d0fa03f80589cbcaf31 refs/heads/maint\0multi_ack\n |
| S: 003fd049f6c27a2244e12041955e262a404c7faba355 refs/heads/master\n |
| S: 003c2cb58b79488a98d2721cea644875a8dd0026b115 refs/tags/v1.0\n |
| S: 003fa3c2e2402b99163d1d59756e5f207ae21cccba4c refs/tags/v1.0^{}\n |
| S: 0000</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The client may send Extra Parameters (see |
| <a href="gitprotocol-pack.html">gitprotocol-pack(5)</a>) as a colon-separated string |
| in the Git-Protocol HTTP header.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Uses the <code>--http-backend-info-refs</code> option to |
| <a href="git-upload-pack.html">git-upload-pack(1)</a>.</p> |
| </div> |
| <div class="sect3"> |
| <h4 id="_dumb_server_response">Dumb Server Response</h4> |
| <div class="paragraph"> |
| <p>Dumb servers MUST respond with the dumb server reply format.</p> |
| </div> |
| <div class="paragraph"> |
| <p>See the prior section under dumb clients for a more detailed |
| description of the dumb server response.</p> |
| </div> |
| </div> |
| <div class="sect3"> |
| <h4 id="_smart_server_response">Smart Server Response</h4> |
| <div class="paragraph"> |
| <p>If the server does not recognize the requested service name, or the |
| requested service name has been disabled by the server administrator, |
| the server MUST respond with the <code>403</code> <code>Forbidden</code> HTTP status code.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Otherwise, smart servers MUST respond with the smart server reply |
| format for the requested service name.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Cache-Control headers SHOULD be used to disable caching of the |
| returned entity.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The Content-Type MUST be <code>application/x-$servicename-advertisement</code>. |
| Clients SHOULD fall back to the dumb protocol if another content |
| type is returned. When falling back to the dumb protocol clients |
| SHOULD NOT make an additional request to <code>$GIT_URL/info/refs</code>, but |
| instead SHOULD use the response already in hand. Clients MUST NOT |
| continue if they do not support the dumb protocol.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST validate the status code is either <code>200</code> <code>OK</code> or |
| <code>304</code> <code>Not</code> <code>Modified</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST validate the first five bytes of the response entity |
| matches the regex <code>^</code>[<code>0-9a-f</code>]{4}#. If this test fails, clients |
| MUST NOT continue.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST parse the entire response as a sequence of pkt-line |
| records.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST verify the first pkt-line is # <code>service=$servicename</code>. |
| Servers MUST set $servicename to be the request parameter value. |
| Servers SHOULD include an LF at the end of this line. |
| Clients MUST ignore an LF at the end of the line.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Servers MUST terminate the response with the magic <code>0000</code> end |
| pkt-line marker.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The returned response is a pkt-line stream describing each ref and |
| its known value. The stream SHOULD be sorted by name according to |
| the C locale ordering. The stream SHOULD include the default ref |
| named <code>HEAD</code> as the first ref. The stream MUST include capability |
| declarations behind a NUL on the first ref.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The returned response contains "version 1" if "version=1" was sent as an |
| Extra Parameter.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>smart_reply = PKT-LINE("# service=$servicename" LF) |
| "0000" |
| *1("version 1") |
| ref_list |
| "0000" |
| ref_list = empty_list / non_empty_list</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>empty_list = PKT-LINE(zero-id SP "capabilities^{}" NUL cap-list LF)</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>non_empty_list = PKT-LINE(obj-id SP name NUL cap_list LF) |
| *ref_record</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>cap-list = capability *(SP capability) |
| capability = 1*(LC_ALPHA / DIGIT / "-" / "_") |
| LC_ALPHA = %x61-7A</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>ref_record = any_ref / peeled_ref |
| any_ref = PKT-LINE(obj-id SP name LF) |
| peeled_ref = PKT-LINE(obj-id SP name LF) |
| PKT-LINE(obj-id SP name "^{}" LF</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_smart_service_git_upload_pack">Smart Service git-upload-pack</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>This service reads from the repository pointed to by <code>$GIT_URL</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST first perform ref discovery with |
| <code>$GIT_URL/info/refs</code>?service=git-upload-pack.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>C: POST $GIT_URL/git-upload-pack HTTP/1.0 |
| C: Content-Type: application/x-git-upload-pack-request |
| C: |
| C: 0032want 0a53e9ddeaddad63ad106860237bbf53411d11a7\n |
| C: 0032have 441b40d833fdfa93eb2908e52742248faf0ee993\n |
| C: 0000</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>S: 200 OK |
| S: Content-Type: application/x-git-upload-pack-result |
| S: Cache-Control: no-cache |
| S: |
| S: ....ACK %s, continue |
| S: ....NAK</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST NOT reuse or revalidate a cached response. |
| Servers MUST include sufficient Cache-Control headers |
| to prevent caching of the response.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Servers SHOULD support all capabilities defined here.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST send at least one "want" command in the request body. |
| Clients MUST NOT reference an id in a "want" command which did not |
| appear in the response obtained through ref discovery unless the |
| server advertises capability <code>allow-tip-sha1-in-want</code> or |
| <code>allow-reachable-sha1-in-want</code>.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>compute_request = want_list |
| have_list |
| request_end |
| request_end = "0000" / "done"</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>want_list = PKT-LINE(want SP cap_list LF) |
| *(want_pkt) |
| want_pkt = PKT-LINE(want LF) |
| want = "want" SP id |
| cap_list = capability *(SP capability)</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>have_list = *PKT-LINE("have" SP id LF)</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>TODO: Document this further.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="_the_negotiation_algorithm">The Negotiation Algorithm</h3> |
| <div class="paragraph"> |
| <p>The computation to select the minimal pack proceeds as follows |
| (C = client, S = server):</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>init step:</em></p> |
| </div> |
| <div class="paragraph"> |
| <p>C: Use ref discovery to obtain the advertised refs.</p> |
| </div> |
| <div class="paragraph"> |
| <p>C: Place any object seen into set <code>advertised</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>C: Build an empty set, <code>common</code>, to hold the objects that are later |
| determined to be on both ends.</p> |
| </div> |
| <div class="paragraph"> |
| <p>C: Build a set, <code>want</code>, of the objects from <code>advertised</code> that the client |
| wants to fetch, based on what it saw during ref discovery.</p> |
| </div> |
| <div class="paragraph"> |
| <p>C: Start a queue, <code>c_pending</code>, ordered by commit time (popping newest |
| first). Add all client refs. When a commit is popped from |
| the queue its parents SHOULD be automatically inserted back. |
| Commits MUST only enter the queue once.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>one compute step:</em></p> |
| </div> |
| <div class="paragraph"> |
| <p>C: Send one <code>$GIT_URL/git-upload-pack</code> request:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>C: 0032want <want-#1>............................... |
| C: 0032want <want-#2>............................... |
| .... |
| C: 0032have <common-#1>............................. |
| C: 0032have <common-#2>............................. |
| .... |
| C: 0032have <have-#1>............................... |
| C: 0032have <have-#2>............................... |
| .... |
| C: 0000</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The stream is organized into "commands", with each command |
| appearing by itself in a pkt-line. Within a command line, |
| the text leading up to the first space is the command name, |
| and the remainder of the line to the first LF is the value. |
| Command lines are terminated with an LF as the last byte of |
| the pkt-line value.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Commands MUST appear in the following order, if they appear |
| at all in the request stream:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>"want"</p> |
| </li> |
| <li> |
| <p>"have"</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>The stream is terminated by a pkt-line flush (<code>0000</code>).</p> |
| </div> |
| <div class="paragraph"> |
| <p>A single "want" or "have" command MUST have one hex formatted |
| object name as its value. Multiple object names MUST be sent by sending |
| multiple commands. Object names MUST be given using the object format |
| negotiated through the <code>object-format</code> capability (default SHA-1).</p> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>have</code> list is created by popping the first 32 commits |
| from <code>c_pending</code>. Fewer can be supplied if <code>c_pending</code> empties.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If the client has sent 256 "have" commits and has not yet |
| received one of those back from <code>s_common</code>, or the client has |
| emptied <code>c_pending</code> it SHOULD include a "done" command to let |
| the server know it won’t proceed:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>C: 0009done</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>S: Parse the git-upload-pack request:</p> |
| </div> |
| <div class="paragraph"> |
| <p>Verify all objects in <code>want</code> are directly reachable from refs.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The server MAY walk backwards through history or through |
| the reflog to permit slightly stale requests.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If no "want" objects are received, send an error: |
| TODO: Define error if no "want" lines are requested.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If any "want" object is not reachable, send an error: |
| TODO: Define error if an invalid "want" is requested.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Create an empty list, <code>s_common</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If "have" was sent:</p> |
| </div> |
| <div class="paragraph"> |
| <p>Loop through the objects in the order supplied by the client.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For each object, if the server has the object reachable from |
| a ref, add it to <code>s_common</code>. If a commit is added to <code>s_common</code>, |
| do not add any ancestors, even if they also appear in <code>have</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>S: Send the git-upload-pack response:</p> |
| </div> |
| <div class="paragraph"> |
| <p>If the server has found a closed set of objects to pack or the |
| request ends with "done", it replies with the pack. |
| TODO: Document the pack based response</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>S: PACK...</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The returned stream is the side-band-64k protocol supported |
| by the git-upload-pack service, and the pack is embedded into |
| stream 1. Progress messages from the server side MAY appear |
| in stream 2.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Here a "closed set of objects" is defined to have at least |
| one path from every "want" to at least one "common" object.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If the server needs more information, it replies with a |
| status continue response: |
| TODO: Document the non-pack response</p> |
| </div> |
| <div class="paragraph"> |
| <p>C: Parse the upload-pack response: |
| TODO: Document parsing response</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Do another compute step.</em></p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_smart_service_git_receive_pack">Smart Service git-receive-pack</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>This service reads from the repository pointed to by <code>$GIT_URL</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST first perform ref discovery with |
| <code>$GIT_URL/info/refs</code>?service=git-receive-pack.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>C: POST $GIT_URL/git-receive-pack HTTP/1.0 |
| C: Content-Type: application/x-git-receive-pack-request |
| C: |
| C: ....0a53e9ddeaddad63ad106860237bbf53411d11a7 441b40d833fdfa93eb2908e52742248faf0ee993 refs/heads/maint\0 report-status |
| C: 0000 |
| C: PACK....</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>S: 200 OK |
| S: Content-Type: application/x-git-receive-pack-result |
| S: Cache-Control: no-cache |
| S: |
| S: ....</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST NOT reuse or revalidate a cached response. |
| Servers MUST include sufficient Cache-Control headers |
| to prevent caching of the response.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Servers SHOULD support all capabilities defined here.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients MUST send at least one command in the request body. |
| Within the command portion of the request body clients SHOULD send |
| the id obtained through ref discovery as old_id.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>update_request = command_list |
| "PACK" <binary-data></pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>command_list = PKT-LINE(command NUL cap_list LF) |
| *(command_pkt) |
| command_pkt = PKT-LINE(command LF) |
| cap_list = *(SP capability) SP</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>command = create / delete / update |
| create = zero-id SP new_id SP name |
| delete = old_id SP zero-id SP name |
| update = old_id SP new_id SP name</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>TODO: Document this further.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_references">REFERENCES</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><a href="https://www.ietf.org/rfc/rfc1738.txt">RFC 1738: Uniform Resource Locators (URL)</a> |
| <a href="https://www.ietf.org/rfc/rfc2616.txt">RFC 2616: Hypertext Transfer Protocol — HTTP/1.1</a></p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_see_also">SEE ALSO</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><a href="gitprotocol-pack.html">gitprotocol-pack(5)</a> |
| <a href="gitprotocol-capabilities.html">gitprotocol-capabilities(5)</a></p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_git">GIT</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Part of the <a href="git.html">git(1)</a> suite</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div id="footer"> |
| <div id="footer-text"> |
| Last updated 2025-06-20 18:10:42 -0700 |
| </div> |
| </div> |
| </body> |
| </html> |
