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-rw-r--r--Documentation/technical/api-builtin.txt4
-rw-r--r--Documentation/technical/api-diff.txt10
-rw-r--r--Documentation/technical/api-parse-options.txt6
-rw-r--r--Documentation/technical/api-ref-iteration.txt4
-rw-r--r--Documentation/technical/api-remote.txt20
-rw-r--r--Documentation/technical/http-protocol.txt229
-rw-r--r--Documentation/technical/pack-heuristics.txt4
-rw-r--r--Documentation/technical/pack-protocol.txt7
-rw-r--r--Documentation/technical/protocol-capabilities.txt31
9 files changed, 173 insertions, 142 deletions
diff --git a/Documentation/technical/api-builtin.txt b/Documentation/technical/api-builtin.txt
index f3c1357..e3d6e7a 100644
--- a/Documentation/technical/api-builtin.txt
+++ b/Documentation/technical/api-builtin.txt
@@ -14,8 +14,8 @@ Git:
. Add the external declaration for the function to `builtin.h`.
-. Add the command to `commands[]` table in `handle_internal_command()`,
- defined in `git.c`. The entry should look like:
+. Add the command to the `commands[]` table defined in `git.c`.
+ The entry should look like:
{ "foo", cmd_foo, <options> },
+
diff --git a/Documentation/technical/api-diff.txt b/Documentation/technical/api-diff.txt
index 2d2ebc0..8b001de 100644
--- a/Documentation/technical/api-diff.txt
+++ b/Documentation/technical/api-diff.txt
@@ -28,7 +28,8 @@ Calling sequence
* Call `diff_setup_done()`; this inspects the options set up so far for
internal consistency and make necessary tweaking to it (e.g. if
- textual patch output was asked, recursive behaviour is turned on).
+ textual patch output was asked, recursive behaviour is turned on);
+ the callback set_default in diff_options can be used to tweak this more.
* As you find different pairs of files, call `diff_change()` to feed
modified files, `diff_addremove()` to feed created or deleted files,
@@ -115,6 +116,13 @@ Notable members are:
operation, but some do not have anything to do with the diffcore
library.
+`touched_flags`::
+ Records whether a flag has been changed due to user request
+ (rather than just set/unset by default).
+
+`set_default`::
+ Callback which allows tweaking the options in diff_setup_done().
+
BINARY, TEXT;;
Affects the way how a file that is seemingly binary is treated.
diff --git a/Documentation/technical/api-parse-options.txt b/Documentation/technical/api-parse-options.txt
index 0be2b51..be50cf4 100644
--- a/Documentation/technical/api-parse-options.txt
+++ b/Documentation/technical/api-parse-options.txt
@@ -29,9 +29,9 @@ that allow to change the behavior of a command.
The parse-options API allows:
-* 'sticked' and 'separate form' of options with arguments.
- `-oArg` is sticked, `-o Arg` is separate form.
- `--option=Arg` is sticked, `--option Arg` is separate form.
+* 'stuck' and 'separate form' of options with arguments.
+ `-oArg` is stuck, `-o Arg` is separate form.
+ `--option=Arg` is stuck, `--option Arg` is separate form.
* Long options may be 'abbreviated', as long as the abbreviation
is unambiguous.
diff --git a/Documentation/technical/api-ref-iteration.txt b/Documentation/technical/api-ref-iteration.txt
index aa1c50f..02adfd4 100644
--- a/Documentation/technical/api-ref-iteration.txt
+++ b/Documentation/technical/api-ref-iteration.txt
@@ -50,10 +50,10 @@ submodules object database. You can do this by a code-snippet like
this:
const char *path = "path/to/submodule"
- if (!add_submodule_odb(path))
+ if (add_submodule_odb(path))
die("Error submodule '%s' not populated.", path);
-`add_submodule_odb()` will return an non-zero value on success. If you
+`add_submodule_odb()` will return zero on success. If you
do not do this you will get an error for each ref that it does not point
to a valid object.
diff --git a/Documentation/technical/api-remote.txt b/Documentation/technical/api-remote.txt
index 4be8776..5d245aa 100644
--- a/Documentation/technical/api-remote.txt
+++ b/Documentation/technical/api-remote.txt
@@ -58,16 +58,16 @@ default remote, given the current branch and configuration.
struct refspec
--------------
-A struct refspec holds the parsed interpretation of a refspec. If it
-will force updates (starts with a '+'), force is true. If it is a
-pattern (sides end with '*') pattern is true. src and dest are the two
-sides (if a pattern, only the part outside of the wildcards); if there
-is only one side, it is src, and dst is NULL; if sides exist but are
-empty (i.e., the refspec either starts or ends with ':'), the
-corresponding side is "".
-
-This parsing can be done to an array of strings to give an array of
-struct refpsecs with parse_ref_spec().
+A struct refspec holds the parsed interpretation of a refspec. If it
+will force updates (starts with a '+'), force is true. If it is a
+pattern (sides end with '*') pattern is true. src and dest are the
+two sides (including '*' characters if present); if there is only one
+side, it is src, and dst is NULL; if sides exist but are empty (i.e.,
+the refspec either starts or ends with ':'), the corresponding side is
+"".
+
+An array of strings can be parsed into an array of struct refspecs
+using parse_fetch_refspec() or parse_push_refspec().
remote_find_tracking(), given a remote and a struct refspec with
either src or dst filled out, will fill out the other such that the
diff --git a/Documentation/technical/http-protocol.txt b/Documentation/technical/http-protocol.txt
index caf941a..544373b 100644
--- a/Documentation/technical/http-protocol.txt
+++ b/Documentation/technical/http-protocol.txt
@@ -20,13 +20,13 @@ URL syntax documented by RFC 1738, so they are of the form:
http://<host>:<port>/<path>?<searchpart>
-Within this documentation the placeholder $GIT_URL will stand for
+Within this documentation the placeholder `$GIT_URL` will stand for
the http:// repository URL entered by the end-user.
-Servers SHOULD handle all requests to locations matching $GIT_URL, as
+Servers SHOULD handle all requests to locations matching `$GIT_URL`, as
both the "smart" and "dumb" HTTP protocols used by Git operate
by appending additional path components onto the end of the user
-supplied $GIT_URL string.
+supplied `$GIT_URL` string.
An example of a dumb client requesting for a loose object:
@@ -43,10 +43,10 @@ An example of a request to a submodule:
$GIT_URL: http://example.com/git/repo.git/path/submodule.git
URL request: http://example.com/git/repo.git/path/submodule.git/info/refs
-Clients MUST strip a trailing '/', if present, from the user supplied
-$GIT_URL string to prevent empty path tokens ('//') from appearing
+Clients MUST strip a trailing `/`, if present, from the user supplied
+`$GIT_URL` string to prevent empty path tokens (`//`) from appearing
in any URL sent to a server. Compatible clients MUST expand
-'$GIT_URL/info/refs' as 'foo/info/refs' and not 'foo//info/refs'.
+`$GIT_URL/info/refs` as `foo/info/refs` and not `foo//info/refs`.
Authentication
@@ -103,14 +103,14 @@ Except where noted, all standard HTTP behavior SHOULD be assumed
by both client and server. This includes (but is not necessarily
limited to):
-If there is no repository at $GIT_URL, or the resource pointed to by a
-location matching $GIT_URL does not exist, the server MUST NOT respond
-with '200 OK' response. A server SHOULD respond with
-'404 Not Found', '410 Gone', or any other suitable HTTP status code
+If there is no repository at `$GIT_URL`, or the resource pointed to by a
+location matching `$GIT_URL` does not exist, the server MUST NOT respond
+with `200 OK` response. A server SHOULD respond with
+`404 Not Found`, `410 Gone`, or any other suitable HTTP status code
which does not imply the resource exists as requested.
-If there is a repository at $GIT_URL, but access is not currently
-permitted, the server MUST respond with the '403 Forbidden' HTTP
+If there is a repository at `$GIT_URL`, but access is not currently
+permitted, the server MUST respond with the `403 Forbidden` HTTP
status code.
Servers SHOULD support both HTTP 1.0 and HTTP 1.1.
@@ -126,9 +126,9 @@ Servers MAY return ETag and/or Last-Modified headers.
Clients MAY revalidate cached entities by including If-Modified-Since
and/or If-None-Match request headers.
-Servers MAY return '304 Not Modified' if the relevant headers appear
+Servers MAY return `304 Not Modified` if the relevant headers appear
in the request and the entity has not changed. Clients MUST treat
-'304 Not Modified' identical to '200 OK' by reusing the cached entity.
+`304 Not Modified` identical to `200 OK` by reusing the cached entity.
Clients MAY reuse a cached entity without revalidation if the
Cache-Control and/or Expires header permits caching. Clients and
@@ -148,7 +148,7 @@ HTTP clients that only support the "dumb" protocol MUST discover
references by making a request for the special info/refs file of
the repository.
-Dumb HTTP clients MUST make a GET request to $GIT_URL/info/refs,
+Dumb HTTP clients MUST make a `GET` request to `$GIT_URL/info/refs`,
without any search/query parameters.
C: GET $GIT_URL/info/refs HTTP/1.0
@@ -161,21 +161,21 @@ without any search/query parameters.
S: a3c2e2402b99163d1d59756e5f207ae21cccba4c refs/tags/v1.0^{}
The Content-Type of the returned info/refs entity SHOULD be
-"text/plain; charset=utf-8", but MAY be any content type.
+`text/plain; charset=utf-8`, but MAY be any content type.
Clients MUST NOT attempt to validate the returned Content-Type.
Dumb servers MUST NOT return a return type starting with
-"application/x-git-".
+`application/x-git-`.
Cache-Control headers MAY be returned to disable caching of the
returned entity.
When examining the response clients SHOULD only examine the HTTP
-status code. Valid responses are '200 OK', or '304 Not Modified'.
+status code. Valid responses are `200 OK`, or `304 Not Modified`.
The returned content is a UNIX formatted text file describing
each ref and its known value. The file SHOULD be sorted by name
according to the C locale ordering. The file SHOULD NOT include
-the default ref named 'HEAD'.
+the default ref named `HEAD`.
info_refs = *( ref_record )
ref_record = any_ref / peeled_ref
@@ -192,13 +192,14 @@ HTTP clients that support the "smart" protocol (or both the
a parameterized request for the info/refs file of the repository.
The request MUST contain exactly one query parameter,
-'service=$servicename', where $servicename MUST be the service
+`service=$servicename`, where `$servicename` MUST be the service
name the client wishes to contact to complete the operation.
The request MUST NOT contain additional query parameters.
C: GET $GIT_URL/info/refs?service=git-upload-pack HTTP/1.0
- dumb server reply:
+dumb server reply:
+
S: 200 OK
S:
S: 95dcfa3633004da0049d3d0fa03f80589cbcaf31 refs/heads/maint
@@ -206,7 +207,8 @@ The request MUST NOT contain additional query parameters.
S: 2cb58b79488a98d2721cea644875a8dd0026b115 refs/tags/v1.0
S: a3c2e2402b99163d1d59756e5f207ae21cccba4c refs/tags/v1.0^{}
- smart server reply:
+smart server reply:
+
S: 200 OK
S: Content-Type: application/x-git-upload-pack-advertisement
S: Cache-Control: no-cache
@@ -228,7 +230,7 @@ Smart Server Response
^^^^^^^^^^^^^^^^^^^^^
If the server does not recognize the requested service name, or the
requested service name has been disabled by the server administrator,
-the server MUST respond with the '403 Forbidden' HTTP status code.
+the server MUST respond with the `403 Forbidden` HTTP status code.
Otherwise, smart servers MUST respond with the smart server reply
format for the requested service name.
@@ -236,35 +238,35 @@ format for the requested service name.
Cache-Control headers SHOULD be used to disable caching of the
returned entity.
-The Content-Type MUST be 'application/x-$servicename-advertisement'.
+The Content-Type MUST be `application/x-$servicename-advertisement`.
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 $GIT_URL/info/refs, but
+SHOULD NOT make an additional request to `$GIT_URL/info/refs`, but
instead SHOULD use the response already in hand. Clients MUST NOT
continue if they do not support the dumb protocol.
-Clients MUST validate the status code is either '200 OK' or
-'304 Not Modified'.
+Clients MUST validate the status code is either `200 OK` or
+`304 Not Modified`.
Clients MUST validate the first five bytes of the response entity
-matches the regex "^[0-9a-f]{4}#". If this test fails, clients
+matches the regex `^[0-9a-f]{4}#`. If this test fails, clients
MUST NOT continue.
Clients MUST parse the entire response as a sequence of pkt-line
records.
-Clients MUST verify the first pkt-line is "# service=$servicename".
+Clients MUST verify the first pkt-line is `# service=$servicename`.
Servers MUST set $servicename to be the request parameter value.
Servers SHOULD include an LF at the end of this line.
Clients MUST ignore an LF at the end of the line.
-Servers MUST terminate the response with the magic "0000" end
+Servers MUST terminate the response with the magic `0000` end
pkt-line marker.
The returned response is a pkt-line stream describing each ref and
its known value. The stream SHOULD be sorted by name according to
the C locale ordering. The stream SHOULD include the default ref
-named 'HEAD' as the first ref. The stream MUST include capability
+named `HEAD` as the first ref. The stream MUST include capability
declarations behind a NUL on the first ref.
smart_reply = PKT-LINE("# service=$servicename" LF)
@@ -286,12 +288,13 @@ declarations behind a NUL on the first ref.
peeled_ref = PKT-LINE(obj-id SP name LF)
PKT-LINE(obj-id SP name "^{}" LF
+
Smart Service git-upload-pack
------------------------------
-This service reads from the repository pointed to by $GIT_URL.
+This service reads from the repository pointed to by `$GIT_URL`.
Clients MUST first perform ref discovery with
-'$GIT_URL/info/refs?service=git-upload-pack'.
+`$GIT_URL/info/refs?service=git-upload-pack`.
C: POST $GIT_URL/git-upload-pack HTTP/1.0
C: Content-Type: application/x-git-upload-pack-request
@@ -307,16 +310,16 @@ Clients MUST first perform ref discovery with
S: ....ACK %s, continue
S: ....NAK
-Clients MUST NOT reuse or revalidate a cached reponse.
+Clients MUST NOT reuse or revalidate a cached response.
Servers MUST include sufficient Cache-Control headers
to prevent caching of the response.
Servers SHOULD support all capabilities defined here.
-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
+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 "allow-tip-sha1-in-want".
+server advertises capability `allow-tip-sha1-in-want`.
compute_request = want_list
have_list
@@ -332,128 +335,128 @@ server advertises capability "allow-tip-sha1-in-want".
have_list = *PKT-LINE("have" SP id LF)
TODO: Document this further.
-TODO: Don't use uppercase for variable names below.
The Negotiation Algorithm
~~~~~~~~~~~~~~~~~~~~~~~~~
The computation to select the minimal pack proceeds as follows
-(c = client, s = server):
+(C = client, S = server):
+
+'init step:'
+
+C: Use ref discovery to obtain the advertised refs.
+
+C: Place any object seen into set `advertised`.
- init step:
- (c) Use ref discovery to obtain the advertised refs.
- (c) Place any object seen into set ADVERTISED.
+C: Build an empty set, `common`, to hold the objects that are later
+ determined to be on both ends.
- (c) Build an empty set, COMMON, to hold the objects that are later
- determined to be on both ends.
- (c) Build a set, WANT, of the objects from ADVERTISED the client
- wants to fetch, based on what it saw during ref discovery.
+C: Build a set, `want`, of the objects from `advertised` the client
+ wants to fetch, based on what it saw during ref discovery.
- (c) Start a queue, C_PENDING, 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.
+C: Start a queue, `c_pending`, 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.
- one compute step:
- (c) Send one $GIT_URL/git-upload-pack request:
+'one compute step:'
- C: 0032want <WANT #1>...............................
- C: 0032want <WANT #2>...............................
+C: Send one `$GIT_URL/git-upload-pack` request:
+
+ C: 0032want <want #1>...............................
+ C: 0032want <want #2>...............................
....
- C: 0032have <COMMON #1>.............................
- C: 0032have <COMMON #2>.............................
+ C: 0032have <common #1>.............................
+ C: 0032have <common #2>.............................
....
- C: 0032have <HAVE #1>...............................
- C: 0032have <HAVE #2>...............................
+ C: 0032have <have #1>...............................
+ C: 0032have <have #2>...............................
....
C: 0000
- 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.
+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.
- Commands MUST appear in the following order, if they appear
- at all in the request stream:
+Commands MUST appear in the following order, if they appear
+at all in the request stream:
- * want
- * have
+* "want"
+* "have"
- The stream is terminated by a pkt-line flush ("0000").
+The stream is terminated by a pkt-line flush (`0000`).
- A single "want" or "have" command MUST have one hex formatted
- SHA-1 as its value. Multiple SHA-1s MUST be sent by sending
- multiple commands.
+A single "want" or "have" command MUST have one hex formatted
+SHA-1 as its value. Multiple SHA-1s MUST be sent by sending
+multiple commands.
- The HAVE list is created by popping the first 32 commits
- from C_PENDING. Less can be supplied if C_PENDING empties.
+The `have` list is created by popping the first 32 commits
+from `c_pending`. Less can be supplied if `c_pending` empties.
- If the client has sent 256 HAVE commits and has not yet
- received one of those back from S_COMMON, or the client has
- emptied C_PENDING it SHOULD include a "done" command to let
- the server know it won't proceed:
+If the client has sent 256 "have" commits and has not yet
+received one of those back from `s_common`, or the client has
+emptied `c_pending` it SHOULD include a "done" command to let
+the server know it won't proceed:
C: 0009done
- (s) Parse the git-upload-pack request:
-
- Verify all objects in WANT are directly reachable from refs.
-
- The server MAY walk backwards through history or through
- the reflog to permit slightly stale requests.
+S: Parse the git-upload-pack request:
- If no WANT objects are received, send an error:
+Verify all objects in `want` are directly reachable from refs.
-TODO: Define error if no want lines are requested.
+The server MAY walk backwards through history or through
+the reflog to permit slightly stale requests.
- If any WANT object is not reachable, send an error:
+If no "want" objects are received, send an error:
+TODO: Define error if no "want" lines are requested.
-TODO: Define error if an invalid want is requested.
+If any "want" object is not reachable, send an error:
+TODO: Define error if an invalid "want" is requested.
- Create an empty list, S_COMMON.
+Create an empty list, `s_common`.
- If 'have' was sent:
+If "have" was sent:
- Loop through the objects in the order supplied by the client.
- For each object, if the server has the object reachable from
- a ref, add it to S_COMMON. If a commit is added to S_COMMON,
- do not add any ancestors, even if they also appear in HAVE.
+Loop through the objects in the order supplied by the client.
- (s) Send the git-upload-pack response:
+For each object, if the server has the object reachable from
+a ref, add it to `s_common`. If a commit is added to `s_common`,
+do not add any ancestors, even if they also appear in `have`.
- If the server has found a closed set of objects to pack or the
- request ends with "done", it replies with the pack.
+S: Send the git-upload-pack response:
+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
- S: PACK...
- 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.
+ S: PACK...
- Here a "closed set of objects" is defined to have at least
- one path from every WANT to at least one COMMON object.
+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.
- If the server needs more information, it replies with a
- status continue response:
+Here a "closed set of objects" is defined to have at least
+one path from every "want" to at least one "common" object.
+If the server needs more information, it replies with a
+status continue response:
TODO: Document the non-pack response
- (c) Parse the upload-pack response:
-
-TODO: Document parsing response
+C: Parse the upload-pack response:
+ TODO: Document parsing response
- Do another compute step.
+'Do another compute step.'
Smart Service git-receive-pack
------------------------------
-This service reads from the repository pointed to by $GIT_URL.
+This service reads from the repository pointed to by `$GIT_URL`.
Clients MUST first perform ref discovery with
-'$GIT_URL/info/refs?service=git-receive-pack'.
+`$GIT_URL/info/refs?service=git-receive-pack`.
C: POST $GIT_URL/git-receive-pack HTTP/1.0
C: Content-Type: application/x-git-receive-pack-request
@@ -468,7 +471,7 @@ Clients MUST first perform ref discovery with
S:
S: ....
-Clients MUST NOT reuse or revalidate a cached reponse.
+Clients MUST NOT reuse or revalidate a cached response.
Servers MUST include sufficient Cache-Control headers
to prevent caching of the response.
diff --git a/Documentation/technical/pack-heuristics.txt b/Documentation/technical/pack-heuristics.txt
index b7bd951..95a07db 100644
--- a/Documentation/technical/pack-heuristics.txt
+++ b/Documentation/technical/pack-heuristics.txt
@@ -1,5 +1,5 @@
- Concerning Git's Packing Heuristics
- ===================================
+Concerning Git's Packing Heuristics
+===================================
Oh, here's a really stupid question:
diff --git a/Documentation/technical/pack-protocol.txt b/Documentation/technical/pack-protocol.txt
index b898e97..c73b62f 100644
--- a/Documentation/technical/pack-protocol.txt
+++ b/Documentation/technical/pack-protocol.txt
@@ -161,6 +161,7 @@ MUST peel the ref if it's an annotated tag.
----
advertised-refs = (no-refs / list-of-refs)
+ *shallow
flush-pkt
no-refs = PKT-LINE(zero-id SP "capabilities^{}"
@@ -174,6 +175,8 @@ MUST peel the ref if it's an annotated tag.
other-tip = obj-id SP refname LF
other-peeled = obj-id SP refname "^{}" LF
+ shallow = PKT-LINE("shallow" SP obj-id)
+
capability-list = capability *(SP capability)
capability = 1*(LC_ALPHA / DIGIT / "-" / "_")
LC_ALPHA = %x61-7A
@@ -461,7 +464,9 @@ contain all the objects that the server will need to complete the new
references.
----
- update-request = command-list [pack-file]
+ update-request = *shallow command-list [pack-file]
+
+ shallow = PKT-LINE("shallow" SP obj-id)
command-list = PKT-LINE(command NUL capability-list LF)
*PKT-LINE(command LF)
diff --git a/Documentation/technical/protocol-capabilities.txt b/Documentation/technical/protocol-capabilities.txt
index fd8ffa5..e3e7924 100644
--- a/Documentation/technical/protocol-capabilities.txt
+++ b/Documentation/technical/protocol-capabilities.txt
@@ -72,14 +72,29 @@ interleaved with S-R-Q.
thin-pack
---------
-This capability means that the server can send a 'thin' pack, a pack
-which does not contain base objects; if those base objects are available
-on client side. Client requests 'thin-pack' capability when it
-understands how to "thicken" it by adding required delta bases making
-it self-contained.
-
-Client MUST NOT request 'thin-pack' capability if it cannot turn a thin
-pack into a self-contained pack.
+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.
+
+The upload-pack server advertises 'thin-pack' when it can generate
+and send a thin pack. A client requests the 'thin-pack' capability
+when it understands how to "thicken" it, notifying the server that
+it can receive such a pack. A client MUST NOT request the
+'thin-pack' capability if it cannot turn a thin pack into a
+self-contained pack.
+
+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 'no-thin' capability. A client MUST NOT send a thin
+pack if the server advertises the 'no-thin' capability.
+
+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 'no-thin' later allowed receive-pack
+to disable the feature in a backwards-compatible manner.
side-band, side-band-64k