FM / git

/usr/share/doc/git

Name	Size	Mode	Actions
contrib/	-	0755	rm
howto/	-	0755	rm
RelNotes/	-	0755	rm
technical/	-	0755	rm
blame-options.txt	6001	0644	edit dl rm
cmds-ancillaryinterrogators.txt	1294	0644	edit dl rm
cmds-ancillarymanipulators.txt	746	0644	edit dl rm
cmds-developerinterfaces.txt	678	0644	edit dl rm
cmds-foreignscminterface.txt	399	0644	edit dl rm
cmds-guide.txt	833	0644	edit dl rm
cmds-mainporcelain.txt	3033	0644	edit dl rm
cmds-plumbinginterrogators.txt	1539	0644	edit dl rm
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cmds-synchelpers.txt	449	0644	edit dl rm
cmds-synchingrepositories.txt	397	0644	edit dl rm
cmds-userinterfaces.txt	507	0644	edit dl rm
CODE_OF_CONDUCT.md	5989	0644	edit dl rm
config.txt	18001	0644	edit dl rm
date-formats.txt	1172	0644	edit dl rm
diff-format.txt	6573	0644	edit dl rm
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docbook-xsl.css	4557	0644	edit dl rm
everyday.html	16996	0644	edit dl rm
fetch-options.txt	12281	0644	edit dl rm
fsck-msgids.txt	4197	0644	edit dl rm
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git-http-push.txt	2995	0644	edit dl rm
git-imap-send.html	25472	0644	edit dl rm
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git-index-pack.html	24735	0644	edit dl rm
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git-ls-tree.html	25628	0644	edit dl rm
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git-mailinfo.html	23402	0644	edit dl rm
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git-mailsplit.html	19264	0644	edit dl rm
git-mailsplit.txt	1342	0644	edit dl rm
git-maintenance.html	46000	0644	edit dl rm
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git-merge.txt	15068	0644	edit dl rm
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git-prune-packed.html	18539	0644	edit dl rm
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git-pull.html	77070	0644	edit dl rm
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git-push.html	74993	0644	edit dl rm
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git-quiltimport.html	19466	0644	edit dl rm
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git-remote.txt	8768	0644	edit dl rm
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Edit: /usr/share/doc/git/gitprotocol-capabilities.html (37425B)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
    "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
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<title>gitprotocol-capabilities(5)</title>
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<div id="header">
<h1>
gitprotocol-capabilities(5) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>gitprotocol-capabilities -
   Protocol v0 and v1 capabilities
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content">&lt;over-the-wire-protocol&gt;</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="admonitionblock">
<table><tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">this document describes capabilities for versions 0 and 1 of the pack
protocol. For version 2, please refer to the <a href="gitprotocol-v2.html">gitprotocol-v2(5)</a>
doc.</td>
</tr></table>
</div>
<div class="paragraph"><p>Servers SHOULD support all capabilities defined in this document.</p></div>
<div class="paragraph"><p>On the very first line of the initial server response of either
receive-pack and upload-pack the first reference is followed by
a NUL byte and then a list of space delimited server capabilities.
These allow the server to declare what it can and cannot support
to the client.</p></div>
<div class="paragraph"><p>Client will then send a space separated list of capabilities it wants
to be in effect. The client MUST NOT ask for capabilities the server
did not say it supports.</p></div>
<div class="paragraph"><p>Server MUST diagnose and abort if capabilities it does not understand
were sent.  Server MUST NOT ignore capabilities that client requested
and server advertised.  As a consequence of these rules, server MUST
NOT advertise capabilities it does not understand.</p></div>
<div class="paragraph"><p>The <em>atomic</em>, <em>report-status</em>, <em>report-status-v2</em>, <em>delete-refs</em>, <em>quiet</em>,
and <em>push-cert</em> capabilities are sent and recognized by the receive-pack
(push to server) process.</p></div>
<div class="paragraph"><p>The <em>ofs-delta</em> and <em>side-band-64k</em> capabilities are sent and recognized
by both upload-pack and receive-pack protocols.  The <em>agent</em> and <em>session-id</em>
capabilities may optionally be sent in both protocols.</p></div>
<div class="paragraph"><p>All other capabilities are only recognized by the upload-pack (fetch
from server) process.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_multi_ack">multi_ack</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <em>multi_ack</em> capability allows the server to return "ACK obj-id
continue" as soon as it finds a commit that it can use as a common
base, between the client&#8217;s wants and the client&#8217;s have set.</p></div>
<div class="paragraph"><p>By sending this early, the server can potentially head off the client
from walking any further down that particular branch of the client&#8217;s
repository history.  The client may still need to walk down other
branches, sending have lines for those, until the server has a
complete cut across the DAG, or the client has said "done".</p></div>
<div class="paragraph"><p>Without multi_ack, a client sends have lines in --date-order until
the server has found a common base.  That means the client will send
have lines that are already known by the server to be common, because
they overlap in time with another branch on which the server hasn&#8217;t found
a common base yet.</p></div>
<div class="paragraph"><p>For example suppose the client has commits in caps that the server
doesn&#8217;t and the server has commits in lower case that the client
doesn&#8217;t, as in the following diagram:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>   +---- u ---------------------- x
  /              +----- y
 /              /
a -- b -- c -- d -- E -- F
   \
    +--- Q -- R -- S</code></pre>
</div></div>
<div class="paragraph"><p>If the client wants x,y and starts out by saying have F,S, the server
doesn&#8217;t know what F,S is.  Eventually the client says "have d" and
the server sends "ACK d continue" to let the client know to stop
walking down that line (so don&#8217;t send c-b-a), but it&#8217;s not done yet,
it needs a base for x. The client keeps going with S-R-Q, until a
gets reached, at which point the server has a clear base and it all
ends.</p></div>
<div class="paragraph"><p>Without multi_ack the client would have sent that c-b-a chain anyway,
interleaved with S-R-Q.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_multi_ack_detailed">multi_ack_detailed</h2>
<div class="sectionbody">
<div class="paragraph"><p>This is an extension of multi_ack that permits the client to better
understand the server&#8217;s in-memory state. See <a href="gitprotocol-pack.html">gitprotocol-pack(5)</a>,
section "Packfile Negotiation" for more information.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_no_done">no-done</h2>
<div class="sectionbody">
<div class="paragraph"><p>This capability should only be used with the smart HTTP protocol. If
multi_ack_detailed and no-done are both present, then the sender is
free to immediately send a pack following its first "ACK obj-id ready"
message.</p></div>
<div class="paragraph"><p>Without no-done in the smart HTTP protocol, the server session would
end and the client has to make another trip to send "done" before
the server can send the pack. no-done removes the last round and
thus slightly reduces latency.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_thin_pack">thin-pack</h2>
<div class="sectionbody">
<div class="paragraph"><p>A thin pack is one with deltas which reference base objects not
contained within the pack (but are known to exist at the receiving
end). This can reduce the network traffic significantly, but it
requires the receiving end to know how to "thicken" these packs by
adding the missing bases to the pack.</p></div>
<div class="paragraph"><p>The upload-pack server advertises <em>thin-pack</em> when it can generate
and send a thin pack. A client requests the <em>thin-pack</em> capability
when it understands how to "thicken" it, notifying the server that
it can receive such a pack. A client MUST NOT request the
<em>thin-pack</em> capability if it cannot turn a thin pack into a
self-contained pack.</p></div>
<div class="paragraph"><p>Receive-pack, on the other hand, is assumed by default to be able to
handle thin packs, but can ask the client not to use the feature by
advertising the <em>no-thin</em> capability. A client MUST NOT send a thin
pack if the server advertises the <em>no-thin</em> capability.</p></div>
<div class="paragraph"><p>The reasons for this asymmetry are historical. The receive-pack
program did not exist until after the invention of thin packs, so
historically the reference implementation of receive-pack always
understood thin packs. Adding <em>no-thin</em> later allowed receive-pack
to disable the feature in a backwards-compatible manner.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_side_band_side_band_64k">side-band, side-band-64k</h2>
<div class="sectionbody">
<div class="paragraph"><p>This capability means that the server can send, and the client can understand, multiplexed
progress reports and error info interleaved with the packfile itself.</p></div>
<div class="paragraph"><p>These two options are mutually exclusive. A modern client always
favors <em>side-band-64k</em>.</p></div>
<div class="paragraph"><p>Either mode indicates that the packfile data will be streamed broken
up into packets of up to either 1000 bytes in the case of <em>side_band</em>,
or 65520 bytes in the case of <em>side_band_64k</em>. Each packet is made up
of a leading 4-byte pkt-line length of how much data is in the packet,
followed by a 1-byte stream code, followed by the actual data.</p></div>
<div class="paragraph"><p>The stream code can be one of:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>1 - pack data
2 - progress messages
3 - fatal error message just before stream aborts</code></pre>
</div></div>
<div class="paragraph"><p>The "side-band-64k" capability came about as a way for newer clients
that can handle much larger packets to request packets that are
actually crammed nearly full, while maintaining backward compatibility
for the older clients.</p></div>
<div class="paragraph"><p>Further, with side-band and its up to 1000-byte messages, it&#8217;s actually
999 bytes of payload and 1 byte for the stream code. With side-band-64k,
same deal, you have up to 65519 bytes of data and 1 byte for the stream
code.</p></div>
<div class="paragraph"><p>The client MUST send only one of "side-band" and "side-
band-64k".  The server MUST diagnose it as an error if client requests
both.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_ofs_delta">ofs-delta</h2>
<div class="sectionbody">
<div class="paragraph"><p>The server can send, and the client can understand, PACKv2 with delta referring to
its base by position in pack rather than by an obj-id.  That is, they can
send/read OBJ_OFS_DELTA (aka type 6) in a packfile.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_agent">agent</h2>
<div class="sectionbody">
<div class="paragraph"><p>The server may optionally send a capability of the form <code>agent=X</code> to
notify the client that the server is running version <code>X</code>. The client may
optionally return its own agent string by responding with an <code>agent=Y</code>
capability (but it MUST NOT do so if the server did not mention the
agent capability). The <code>X</code> and <code>Y</code> strings may contain any printable
ASCII characters except space (i.e., the byte range 32 &lt; x &lt; 127), and
are typically of the form "package/version" (e.g., "git/1.8.3.1"). The
agent strings are purely informative for statistics and debugging
purposes, and MUST NOT be used to programmatically assume the presence
or absence of particular features.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_object_format">object-format</h2>
<div class="sectionbody">
<div class="paragraph"><p>This capability, which takes a hash algorithm as an argument, indicates
that the server supports the given hash algorithms.  It may be sent
multiple times; if so, the first one given is the one used in the ref
advertisement.</p></div>
<div class="paragraph"><p>When provided by the client, this indicates that it intends to use the
given hash algorithm to communicate.  The algorithm provided must be one
that the server supports.</p></div>
<div class="paragraph"><p>If this capability is not provided, it is assumed that the only
supported algorithm is SHA-1.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_symref">symref</h2>
<div class="sectionbody">
<div class="paragraph"><p>This parameterized capability is used to inform the receiver which symbolic ref
points to which ref; for example, "symref=HEAD:refs/heads/master" tells the
receiver that HEAD points to master. This capability can be repeated to
represent multiple symrefs.</p></div>
<div class="paragraph"><p>Servers SHOULD include this capability for the HEAD symref if it is one of the
refs being sent.</p></div>
<div class="paragraph"><p>Clients MAY use the parameters from this capability to select the proper initial
branch when cloning a repository.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_shallow">shallow</h2>
<div class="sectionbody">
<div class="paragraph"><p>This capability adds "deepen", "shallow" and "unshallow" commands to
the  fetch-pack/upload-pack protocol so clients can request shallow
clones.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_deepen_since">deepen-since</h2>
<div class="sectionbody">
<div class="paragraph"><p>This capability adds "deepen-since" command to fetch-pack/upload-pack
protocol so the client can request shallow clones that are cut at a
specific time, instead of depth. Internally it&#8217;s equivalent of doing
"rev-list --max-age=&lt;timestamp&gt;" on the server side. "deepen-since"
cannot be used with "deepen".</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_deepen_not">deepen-not</h2>
<div class="sectionbody">
<div class="paragraph"><p>This capability adds "deepen-not" command to fetch-pack/upload-pack
protocol so the client can request shallow clones that are cut at a
specific revision, instead of depth. Internally it&#8217;s equivalent of
doing "rev-list --not &lt;rev&gt;" on the server side. "deepen-not"
cannot be used with "deepen", but can be used with "deepen-since".</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_deepen_relative">deepen-relative</h2>
<div class="sectionbody">
<div class="paragraph"><p>If this capability is requested by the client, the semantics of
"deepen" command is changed. The "depth" argument is the depth from
the current shallow boundary, instead of the depth from remote refs.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_no_progress">no-progress</h2>
<div class="sectionbody">
<div class="paragraph"><p>The client was started with "git clone -q" or something similar, and doesn&#8217;t
want that side band 2.  Basically the client just says "I do not
wish to receive stream 2 on sideband, so do not send it to me, and if
you did, I will drop it on the floor anyway".  However, the sideband
channel 3 is still used for error responses.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_include_tag">include-tag</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <em>include-tag</em> capability is about sending annotated tags if we are
sending objects they point to.  If we pack an object to the client, and
a tag object points exactly at that object, we pack the tag object too.
In general this allows a client to get all new annotated tags when it
fetches a branch, in a single network connection.</p></div>
<div class="paragraph"><p>Clients MAY always send include-tag, hardcoding it into a request when
the server advertises this capability. The decision for a client to
request include-tag only has to do with the client&#8217;s desires for tag
data, whether or not a server had advertised objects in the
refs/tags/* namespace.</p></div>
<div class="paragraph"><p>Servers MUST pack the tags if their referent is packed and the client
has requested include-tags.</p></div>
<div class="paragraph"><p>Clients MUST be prepared for the case where a server has ignored
include-tag and has not actually sent tags in the pack.  In such
cases the client SHOULD issue a subsequent fetch to acquire the tags
that include-tag would have otherwise given the client.</p></div>
<div class="paragraph"><p>The server SHOULD send include-tag, if it supports it, regardless
of whether or not there are tags available.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_report_status">report-status</h2>
<div class="sectionbody">
<div class="paragraph"><p>The receive-pack process can receive a <em>report-status</em> capability,
which tells it that the client wants a report of what happened after
a packfile upload and reference update.  If the pushing client requests
this capability, after unpacking and updating references the server
will respond with whether the packfile unpacked successfully and if
each reference was updated successfully.  If any of those were not
successful, it will send back an error message.  See <a href="gitprotocol-pack.html">gitprotocol-pack(5)</a>
for example messages.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_report_status_v2">report-status-v2</h2>
<div class="sectionbody">
<div class="paragraph"><p>Capability <em>report-status-v2</em> extends capability <em>report-status</em> by
adding new "option" directives in order to support reference rewritten by
the "proc-receive" hook.  The "proc-receive" hook may handle a command
for a pseudo-reference which may create or update a reference with
different name, new-oid, and old-oid.  While the capability
<em>report-status</em> cannot report for such case.  See <a href="gitprotocol-pack.html">gitprotocol-pack(5)</a>
for details.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_delete_refs">delete-refs</h2>
<div class="sectionbody">
<div class="paragraph"><p>If the server sends back the <em>delete-refs</em> capability, it means that
it is capable of accepting a zero-id value as the target
value of a reference update.  It is not sent back by the client, it
simply informs the client that it can be sent zero-id values
to delete references.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_quiet">quiet</h2>
<div class="sectionbody">
<div class="paragraph"><p>If the receive-pack server advertises the <em>quiet</em> capability, it is
capable of silencing human-readable progress output which otherwise may
be shown when processing the received pack. A send-pack client should
respond with the <em>quiet</em> capability to suppress server-side progress
reporting if the local progress reporting is also being suppressed
(e.g., via <code>push -q</code>, or if stderr does not go to a tty).</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_atomic">atomic</h2>
<div class="sectionbody">
<div class="paragraph"><p>If the server sends the <em>atomic</em> capability it is capable of accepting
atomic pushes. If the pushing client requests this capability, the server
will update the refs in one atomic transaction. Either all refs are
updated or none.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_push_options">push-options</h2>
<div class="sectionbody">
<div class="paragraph"><p>If the server sends the <em>push-options</em> capability it is able to accept
push options after the update commands have been sent, but before the
packfile is streamed. If the pushing client requests this capability,
the server will pass the options to the pre- and post- receive hooks
that process this push request.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_allow_tip_sha1_in_want">allow-tip-sha1-in-want</h2>
<div class="sectionbody">
<div class="paragraph"><p>If the upload-pack server advertises this capability, fetch-pack may
send "want" lines with object names that exist at the server but are not
advertised by upload-pack. For historical reasons, the name of this
capability contains "sha1". Object names are always given using the
object format negotiated through the <em>object-format</em> capability.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_allow_reachable_sha1_in_want">allow-reachable-sha1-in-want</h2>
<div class="sectionbody">
<div class="paragraph"><p>If the upload-pack server advertises this capability, fetch-pack may
send "want" lines with object names that exist at the server but are not
advertised by upload-pack. For historical reasons, the name of this
capability contains "sha1". Object names are always given using the
object format negotiated through the <em>object-format</em> capability.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_push_cert_lt_nonce_gt">push-cert=&lt;nonce&gt;</h2>
<div class="sectionbody">
<div class="paragraph"><p>The receive-pack server that advertises this capability is willing
to accept a signed push certificate, and asks the &lt;nonce&gt; to be
included in the push certificate.  A send-pack client MUST NOT
send a push-cert packet unless the receive-pack server advertises
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 class="sect1">
<h2 id="_session_id_lt_session_id_gt">session-id=&lt;session id&gt;</h2>
<div class="sectionbody">
<div class="paragraph"><p>The server may advertise a session ID that can be used to identify this process
across multiple requests. The client may advertise its own session ID back to
the server as well.</p></div>
<div class="paragraph"><p>Session IDs should be unique to a given process. They must fit within a
packet-line, and must not contain non-printable or whitespace characters. The
current implementation uses trace2 session IDs (see
<a href="technical/api-trace2.html">api-trace2</a> for details), but this may change
and users of the session ID should not rely on this fact.</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="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated
 2025-06-13 22:14:31 UTC
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