When upload-pack receives a "want" line from the client, it
adds it to an object array. We call lookup_object to find
the actual object, which will only check for objects already
in memory. This works because we are expecting to find
objects that we already loaded during the ref advertisement.
We use the resulting object structs for a variety of
purposes. Some of them care only about the object flags, but
others care about the type of the object (e.g.,
ok_to_give_up), or even feed them to the revision parser
(when --depth is used), which assumes that objects it
receives are fully parsed.
Once upon a time, this was OK; any object we loaded into
memory would also have been parsed. But since 435c833
(upload-pack: use peel_ref for ref advertisements,
2012-10-04), we try to avoid parsing objects during the ref
advertisement. This means that lookup_object may return an
object with a type of OBJ_NONE. The resulting mess depends
on the exact set of objects, but can include the revision
parser barfing, or the shallow code sending the wrong set of
objects.
This patch teaches upload-pack to parse each "want" object
as we receive it. We do not replace the lookup_object call
with parse_object, as the current code is careful not to let
just any object appear on a "want" line, but rather only one
we have previously advertised (whereas parse_object would
actually load any arbitrary object from disk).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When we receive a "have" line from the client, we want to
load the object pointed to by the sha1. However, we are
careful to do:
o = lookup_object(sha1);
if (!o || !o->parsed)
o = parse_object(sha1);
to avoid loading the object from disk if we have already
seen it. However, since ccdc603 (parse_object: try internal
cache before reading object db), parse_object already does
this optimization internally. We can just call parse_object
directly.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When upload-pack advertises refs, we attempt to peel tags
and advertise the peeled version. We currently hand-roll the
tag dereferencing, and use as many optimizations as we can
to avoid loading non-tag objects into memory.
Not only has peel_ref recently learned these optimizations,
too, but it also contains an even more important one: it
has access to the "peeled" data from the pack-refs file.
That means we can avoid not only loading annotated tags
entirely, but also avoid doing any kind of object lookup at
all.
This cut the CPU time to advertise refs by 50% in the
linux-2.6 repo, as measured by:
echo 0000 | git-upload-pack . >/dev/null
best-of-five, warm cache, objects and refs fully packed:
[before] [after]
real 0m0.026s real 0m0.013s
user 0m0.024s user 0m0.008s
sys 0m0.000s sys 0m0.000s
Those numbers are irrelevantly small compared to an actual
fetch. Here's a larger repo (400K refs, of which 12K are
unique, and of which only 107 are unique annotated tags):
[before] [after]
real 0m0.704s real 0m0.596s
user 0m0.600s user 0m0.496s
sys 0m0.096s sys 0m0.092s
This shows only a 15% speedup (mostly because it has fewer
actual tags to parse), but a larger absolute value (100ms,
which isn't a lot compared to a real fetch, but this
advertisement happens on every fetch, even if the client is
just finding out they are completely up to date).
In truly pathological cases, where you have a large number
of unique annotated tags, it can make an even bigger
difference. Here are the numbers for a linux-2.6 repository
that has had every seventh commit tagged (so about 50K
tags):
[before] [after]
real 0m0.443s real 0m0.097s
user 0m0.416s user 0m0.080s
sys 0m0.024s sys 0m0.012s
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The point of peel_ref is to dereference tags; if the base
object is not a tag, then we can return early without even
loading the object into memory.
This patch accomplishes that by checking sha1_object_info
for the type. For a packed object, we can get away with just
looking in the pack index. For a loose object, we only need
to inflate the first couple of header bytes.
This is a bit of a gamble; if we do find a tag object, then
we will end up loading the content anyway, and the extra
lookup will have been wasteful. However, if it is not a tag
object, then we save loading the object entirely. Depending
on the ratio of non-tags to tags in the input, this can be a
minor win or minor loss.
However, it does give us one potential major win: if a ref
points to a large blob (e.g., via an unannotated tag), then
we can avoid looking at it entirely.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The idea of the peel_ref function is to dereference tag
objects recursively until we hit a non-tag, and return the
sha1. Conceptually, it should return 0 if it is successful
(and fill in the sha1), or -1 if there was nothing to peel.
However, the current behavior is much more confusing. For a
regular loose ref, the behavior is as described above. But
there is an optimization to reuse the peeled-ref value for a
ref that came from a packed-refs file. If we have such a
ref, we return its peeled value, even if that peeled value
is null (indicating that we know the ref definitely does
_not_ peel).
It might seem like such information is useful to the caller,
who would then know not to bother loading and trying to peel
the object. Except that they should not bother loading and
trying to peel the object _anyway_, because that fallback is
already handled by peel_ref. In other words, the whole point
of calling this function is that it handles those details
internally, and you either get a sha1, or you know that it
is not peel-able.
This patch catches the null sha1 case internally and
converts it into a -1 return value (i.e., there is nothing
to peel). This simplifies callers, which do not need to
bother checking themselves.
Two callers are worth noting:
- in pack-objects, a comment indicates that there is a
difference between non-peelable tags and unannotated
tags. But that is not the case (before or after this
patch). Whether you get a null sha1 has to do with
internal details of how peel_ref operated.
- in show-ref, if peel_ref returns a failure, the caller
tries to decide whether to try peeling manually based on
whether the REF_ISPACKED flag is set. But this doesn't
make any sense. If the flag is set, that does not
necessarily mean the ref came from a packed-refs file
with the "peeled" extension. But it doesn't matter,
because even if it didn't, there's no point in trying to
peel it ourselves, as peel_ref would already have done
so. In other words, the fallback peeling is guaranteed
to fail.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When we are asked to peel a ref to a sha1, we internally call
deref_tag, which will recursively parse each tagged object
until we reach a non-tag. This has the benefit that we will
verify our ability to load and parse the pointed-to object.
However, there is a performance downside: we may not need to
load that object at all (e.g., if we are listing peeled
simply listing peeled refs), or it may be a large object
that should follow a streaming code path (e.g., an annotated
tag of a large blob).
It makes more sense for peel_ref to choose the fast thing
rather than performing the extra check, for two reasons:
1. We will already sometimes short-circuit the tag parsing
in favor of a peeled entry from a packed-refs file. So
we are already favoring speed in some cases, and it is
not wise for a caller to rely on peel_ref to detect
corruption.
2. We already silently ignore much larger corruptions,
like a ref that points to a non-existent object, or a
tag object that exists but is corrupted.
2. peel_ref is not the right place to check for such a
database corruption. It is returning only the sha1
anyway, not the actual object. Any callers which use
that sha1 to load an object will soon discover the
corruption anyway, so we are really just pushing back
the discovery to later in the program.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
"git submodule frotz" was not diagnosed as "frotz" being an unknown
subcommand to "git submodule"; the user instead got a complaint that
"git submodule status" was run with an unknown path "frotz".
* rr/maint-submodule-unknown-cmd:
submodule: if $command was not matched, don't parse other args
"git fetch" over http advertised that it supports "deflate", which
is much less common, and did not advertise more common "gzip" on its
Accept-Encoding header.
* sp/maint-http-enable-gzip:
Enable info/refs gzip decompression in HTTP client
"git fetch" over http had an old workaround for an unlikely server
misconfiguration; it turns out that this hurts debuggability of the
configuration in general, and has been reverted.
* sp/maint-http-info-refs-no-retry:
Revert "retry request without query when info/refs?query fails"
Update German and Simplified Chinese translations.
* 'maint' of git://github.com/git-l10n/git-po:
l10n: de.po: correct translation of a 'rebase' message
l10n: Improve many translation for zh_CN
l10n: Unify the translation for '(un)expected'
* jc/maint-log-grep-all-match-1:
grep.c: make two symbols really file-scope static this time
t7810-grep: test --all-match with multiple --grep and --author options
t7810-grep: test interaction of multiple --grep and --author options
t7810-grep: test multiple --author with --all-match
t7810-grep: test multiple --grep with and without --all-match
t7810-grep: bring log --grep tests in common form
grep.c: mark private file-scope symbols as static
log: document use of multiple commit limiting options
log --grep/--author: honor --all-match honored for multiple --grep patterns
grep: show --debug output only once
grep: teach --debug option to dump the parse tree
"git submodule" command DWIMs the command line and assumes a
unspecified action word for 'status' action. This is a UI mistake
that leads to a confusing behaviour. A mistyped command name is
instead treated as a request for 'status' of the submodule with that
name, e.g.
$ git submodule show
error: pathspec 'show' did not match any file(s) known to git.
Did you forget to 'git add'?
Stop DWIMming an unknown or mistyped subcommand name as pathspec
given to unspelled "status" subcommand. "git submodule" without any
argument is still interpreted as "git submodule status", but its
value is questionable.
Adjust t7400 to match, and stop advertising the default subcommand
being 'status' which does not help much in practice, other than
promoting laziness and confusion.
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This reverts commit 25ae7cfd19.
That patch does fix expansion of weird variables in some
simple tests, but it also seems to break other things, like
expansion of refs by "git checkout".
While we're sorting out the correct solution, we are much
better with the original bug (people with metacharacters in
their completions occasionally see an error message) than
the current bug (ref completion does not work at all).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Even during a conflicted merge, "git blame $path" always meant to
blame uncommitted changes to the "working tree" version; make it
more useful by showing cleanly merged parts as coming from the other
branch that is being merged.
This incidentally fixes an unrelated problem on a case insensitive
filesystem, where "git blame MAKEFILE" run in a history that has
"Makefile" but not "MAKEFILE" did not say "No such file MAKEFILE in
HEAD" but pretended as if "MAKEFILE" was a newly added file.
* jc/maint-blame-no-such-path:
blame: allow "blame file" in the middle of a conflicted merge
blame $path: avoid getting fooled by case insensitive filesystems
"git fetch --all", when passed "--no-tags", did not honor the
"--no-tags" option while fetching from individual remotes (the same
issue existed with "--tags", but combination "--all --tags" makes
much less sense than "--all --no-tags").
* dj/fetch-all-tags:
fetch --all: pass --tags/--no-tags through to each remote
submodule: use argv_array instead of hand-building arrays
fetch: use argv_array instead of hand-building arrays
argv-array: fix bogus cast when freeing array
argv-array: add pop function
Describe what '=' means in the output of __git_ps1 when using
GIT_PS1_SHOWUPSTREAM, which was not previously described.
Signed-off-by: Jonathan "Duke" Leto <jonathan@leto.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Adding a declaration at the beginning is not sufficient for obvious
reasons. The definition has to be made static.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The pretty formats for GPG signatures were introduced but never
documented. Use the documentation from the commit that introduced them.
Do the same for the --show-signature option added to git log and
friends.
Signed-off-by: Stephen Boyd <bebarino@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Some HTTP servers try to use gzip compression on the /info/refs
request to save transfer bandwidth. Repositories with many tags
may find the /info/refs request can be gzipped to be 50% of the
original size due to the few but often repeated bytes used (hex
SHA-1 and commonly digits in tag names).
For most HTTP requests enable "Accept-Encoding: gzip" ensuring
the /info/refs payload can use this encoding format.
Only request gzip encoding from servers. Although deflate is
supported by libcurl, most servers have standardized on gzip
encoding for compression as that is what most browsers support.
Asking for deflate increases request sizes by a few bytes, but is
unlikely to ever be used by a server.
Disable the Accept-Encoding header on probe RPCs as response bodies
are supposed to be exactly 4 bytes long, "0000". The HTTP headers
requesting and indicating compression use more space than the data
transferred in the body.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This reverts commit 703e6e76a1.
Retrying without the query parameter was added as a workaround
for a single broken HTTP server at git.debian.org[1]. The server
was misconfigured to route every request with a query parameter
into gitweb.cgi. Admins fixed the server's configuration within
16 hours of the bug report to the Git mailing list, but we still
patched Git with this fallback and have been paying for it since.
Most Git hosting services configure the smart HTTP protocol and the
retry logic confuses users when there is a transient HTTP error as
Git dropped the real error from the smart HTTP request. Removing the
retry makes root causes easier to identify.
[1] http://thread.gmane.org/gmane.comp.version-control.git/137609
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
As reported by Jeroen Meijer[1]; the current code doesn't deal properly
with items (tags, branches, etc.) that have ${} in them because they get
expaned by bash while using compgen.
A simple solution is to quote the items so they get expanded properly
(\$\{\}).
In order to achieve that I took bash-completion's quote() function,
which is rather simple, and renamed it to __git_quote() as per Jeff
King's suggestion.
Solves the original problem for me.
[1] http://article.gmane.org/gmane.comp.version-control.git/201596
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The attribute system may be asked for a path that itself or its
leading directories no longer exists in the working tree, and it is
fine if we cannot open .gitattribute file in such a case. Failure
to open per-directory .gitattributes with error status other than
ENOENT and ENOTDIR should be diagnosed.
* jk/config-warn-on-inaccessible-paths:
attr: failure to open a .gitattributes file is OK with ENOTDIR
warn_on_inaccessible(): a helper to warn on inaccessible paths
attr: warn on inaccessible attribute files
gitignore: report access errors of exclude files
config: warn on inaccessible files
Avoid confusion in compound sentence about the start of the commit set
and the depth measure. Use two sentences.
Signed-off-by: Philip Oakley <philipoakley@iee.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The note that explains that changes introduced by removed commits are
preserved should be placed directly after the paragraph that describes
such commits removal. Otherwise the reference to "the commits" appears
out of context.
Also the big example that follows "Consider this history" is about
rewriting part of the history DAG. Move the paragraph that
describes the operation close to it.
Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
"Content-type: text/plain; charset=UTF-8" header should not appear
twice in the input, but it is always better to gracefully deal with
such a case. The current code concatenates the value to the values
we have seen previously, producing nonsense such as "utf8UTF-8".
Instead of concatenating, forget the previous value and use the last
value we see.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Matching the default file prefix b/ does not yield any results if config
option diff.noprefix or diff.mnemonicprefix is enabled.
Signed-off-by: Mischa POSLAWSKY <git@shiar.nl>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Update the documentation of the core.whitespace option
"indent-with-non-tab" to correctly reflect that it catches the use of
spaces instead of the equivalent tabs, rather than a fixed number.
Signed-off-by: Wesley J. Landaker <wjl@icecavern.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The code used to have a bug that ignores "--all-match", that requires
all "--grep" to have matched, when "--author" or "--committer" was used.
Make sure the bug will not be reintroduced.
Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
There are tests for this interaction already. Restructure slightly and
avoid any claims about --all-match.
Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The "--all-match" option is about "--grep", and does not affect how
"--author" or "--committer" limitation is applied.
Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
