Commit graph

291 commits

Author SHA1 Message Date
Junio C Hamano
4615d3e264 Merge branch 'ps/gnumake-4.4-fix'
* ps/gnumake-4.4-fix:
  Makefile: avoid multiple patterns when recipes generate one file
2022-11-30 10:57:19 +09:00
Paul Smith
9f95c7aefa Makefile: avoid multiple patterns when recipes generate one file
A GNU make pattern rule with multiple targets has always meant that
a single invocation of the recipe will build all the targets.
However in older versions of GNU make a recipe that did not really
build all the targets would be tolerated.

Starting with GNU make 4.4 this behavior is deprecated and pattern
rules are expected to generate files to match all the patterns.
If not all targets are created then GNU make will not consider any
target up to date and will re-run the recipe when it is run again.

Modify Documentation/Makefile to split the man page-creating pattern
rule into a separate pattern rule for each pattern.

Reported-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Paul Smith <psmith@gnu.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-11-28 10:18:55 +09:00
Junio C Hamano
3882a0d3ad Documentation: add lint-fsck-msgids
During the initial development of the fsck-msgids.txt feature, it
has become apparent that it is very much error prone to make sure
the description in the documentation file are sorted and correctly
match what is in the fsck.h header file.

Add a quick-and-dirty Perl script and doc-lint target to sanity
check that the fsck-msgids.txt is consistent with the error type
list in the fsck.h header file.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-10-25 15:44:19 -07:00
Junio C Hamano
ac45db1e75 Merge branch 'vd/doc-reviewing-guidelines'
Just like we have coding guidelines, we now have guidelines for
reviewers.

* vd/doc-reviewing-guidelines:
  Documentation: add ReviewingGuidelines
2022-09-21 15:27:02 -07:00
Victoria Dye
e01b851923 Documentation: add ReviewingGuidelines
Add a reviewing guidelines document including advice and common terminology
used in Git mailing list reviews. The document is included in the
'TECH_DOCS' list in order to include it in Git's published documentation.

Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Helped-by: Derrick Stolee <derrickstolee@github.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-09-19 14:36:08 -07:00
Junio C Hamano
42bf77c7d0 Merge branch 'vd/scalar-to-main'
Hoist the remainder of "scalar" out of contrib/ to the main part of
the codebase.

* vd/scalar-to-main:
  Documentation/technical: include Scalar technical doc
  t/perf: add 'GIT_PERF_USE_SCALAR' run option
  t/perf: add Scalar performance tests
  scalar-clone: add test coverage
  scalar: add to 'git help -a' command list
  scalar: implement the `help` subcommand
  git help: special-case `scalar`
  scalar: include in standard Git build & installation
  scalar: fix command documentation section header
2022-09-19 14:35:25 -07:00
Junio C Hamano
7a54d74045 Merge branch 'ab/dedup-config-and-command-docs'
Share the text used to explain configuration variables used by "git
<subcmd>" in "git help <subcmd>" with the text from "git help config".

* ab/dedup-config-and-command-docs:
  docs: add CONFIGURATION sections that fuzzy map to built-ins
  docs: add CONFIGURATION sections that map to a built-in
  log docs: de-duplicate configuration sections
  difftool docs: de-duplicate configuration sections
  notes docs: de-duplicate and combine configuration sections
  apply docs: de-duplicate configuration sections
  send-email docs: de-duplicate configuration sections
  grep docs: de-duplicate configuration sections
  docs: add and use include template for config/* includes
2022-09-14 12:56:40 -07:00
Ævar Arnfjörð Bjarmason
18d89fe25c docs: add and use include template for config/* includes
In b6a8d09f6d (gc docs: include the "gc.*" section from "config" in
"gc", 2019-04-07) the "git gc" documentation was made to include the
config/gc.txt in its "CONFIGURATION" section. We do that in several
other places, but "git gc" was the only one with a blurb above the
include to orient the reader.

We don't want readers to carefully scrutinize "git-config(1)" and
"git-gc(1)" looking for discrepancies, instead we should tell them
that the latter includes a part of the former.

This change formalizes that wording in two new templates to be
included, one for the "git gc" case where the entire section is
included from "git-config(1)", and another for when the inclusion of
"git-config(1)" follows discussion unique to that documentation. In
order to use that re-arrange the order of those being discussed in the
"git-merge(1)" documentation.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Reviewed-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-09-07 09:46:05 -07:00
Victoria Dye
9eb7a73158 Documentation/technical: include Scalar technical doc
Include 'Documentation/technical/scalar.txt' alongside the other HTML
technical docs when installing them.

Now that the document is intended as a widely-accessible reference, remove
the internal work-in-progress roadmap from the document. Those details
should no longer be needed to guide Scalar's development and, if they were
left, they could fall out-of-date and be misleading to readers.

Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-09-02 10:02:56 -07:00
Victoria Dye
7b5c93c6c6 scalar: include in standard Git build & installation
Move 'scalar' out of 'contrib/' and into the root of the Git tree. The goal
of this change is to build 'scalar' as part of the standard Git build &
install processes.

This patch includes both the physical move of Scalar's files out of
'contrib/' ('scalar.c', 'scalar.txt', and 't9xxx-scalar.sh'), and the
changes to the build definitions in 'Makefile' and 'CMakelists.txt' to
accommodate the new program.

At a high level, Scalar is built so that:
- there is a 'scalar-objs' target (similar to those created in 029bac01a8
  (Makefile: add {program,xdiff,test,git,fuzz}-objs & objects targets,
  2021-02-23)) for debugging purposes.
- it appears in the root of the install directory (rather than the
  gitexecdir).
- it is included in the 'bin-wrappers/' directory for use in tests.
- it receives a platform-specific executable suffix (e.g., '.exe'), if
  applicable.
- 'scalar.txt' is installed as 'man1' documentation.
- the 'clean' target removes the 'scalar' executable.

Additionally, update the root level '.gitignore' file to ignore the Scalar
executable.

Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-09-02 10:02:55 -07:00
Junio C Hamano
0d133a3dcf Merge branch 'ds/bundle-uri-more'
The "bundle URI" design gets documented.

* ds/bundle-uri-more:
  bundle-uri: add example bundle organization
  docs: document bundle URI standard
2022-08-18 13:07:04 -07:00
Derrick Stolee
2da14fad8f docs: document bundle URI standard
Introduce the idea of bundle URIs to the Git codebase through an
aspirational design document. This document includes the full design
intended to include the feature in its fully-implemented form. This will
take several steps as detailed in the Implementation Plan section.

By committing this document now, it can be used to motivate changes
necessary to reach these final goals. The design can still be altered as
new information is discovered.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-10 14:03:11 -07:00
Ævar Arnfjörð Bjarmason
1e2320161d docs: move http-protocol docs to man section 5
Continue the move of existing Documentation/technical/* protocol and
file-format documentation into our main documentation space by moving
the http-protocol.txt documentation over. I'm renaming it to
"protocol-http" to be consistent with other things in the new
gitformat-protocol-* namespace.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-04 14:12:24 -07:00
Ævar Arnfjörð Bjarmason
6b6029dd1d docs: move cruft pack docs to gitformat-pack
Integrate the cruft packs documentation initially added in
3d89a8c118 (Documentation/technical: add cruft-packs.txt, 2022-05-20)
to the newly created "gitformat-pack" documentation.

Like the "bitmap-format" added before it in
0d4455a3ab (documentation: add documentation for the bitmap format,
2013-11-14) the "cruft-packs" were documented in their own file.

As the diff move detection will show there is no change to
"Documentation/technical/cruft-packs.txt" here except to move it, and
to "indent" the existing sections by adding an extra "=" to them.

We could similarly convert the "bitmap-format.txt", but let's leave it
for now due to a conflict with the in-flight ac/bitmap-lookup-table
series.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-04 14:12:24 -07:00
Ævar Arnfjörð Bjarmason
977c47b46d docs: move pack format docs to man section 5
Continue the move of existing Documentation/technical/* protocol and
file-format documentation into our main documentation space by moving
the various documentation pertaining to the *.pack format and related
files, and updating things that refer to it to link to the new
location.

By moving these we can properly link from the newly created
gitformat-commit-graph to a gitformat-chunk-format page.

Integrating "Documentation/technical/bitmap-format.txt" and
"Documentation/technical/cruft-packs.txt" might logically be part of
this change, but as those cover parts of the wider "pack
format" (including associated files) that's documented outside of
"Documentation/technical/pack-format.txt" let's leave those for now,
subsequent commit(s) will address those.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-04 14:12:24 -07:00
Ævar Arnfjörð Bjarmason
20516890dc docs: move signature docs to man section 5
Continue the move of existing Documentation/technical/* protocol and
file-format documentation into our main documentation space by moving
the signature format documentation.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-04 14:12:24 -07:00
Ævar Arnfjörð Bjarmason
00d3e8d7dd docs: move index format docs to man section 5
Continue the move of existing Documentation/technical/* protocol and
file-format documentation into our main documentation space by moving
the index format documentation.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-04 14:12:23 -07:00
Ævar Arnfjörð Bjarmason
5db921054e docs: move protocol-related docs to man section 5
Continue the move of existing Documentation/technical/* protocol and
file-format documentation into our main documentation space. By moving
the things that discuss the protocol we can properly link from
e.g. lsrefs.unborn and protocol.version documentation to a manpage we
build by default.

So far we have been using the "gitformat-" prefix for the
documentation we've been moving over from Documentation/technical/*,
but for protocol documentation let's use "gitprotocol-*".

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-04 14:12:23 -07:00
Ævar Arnfjörð Bjarmason
8cbace93d2 docs: move commit-graph format docs to man section 5
Continue the move of existing Documentation/technical/* protocol and
file-format documentation into our main documentation space.

By moving the documentation for the commit-graph format into man
section 5 and the new "developerinterfaces" category. This change is
split from subsequent commits due to the relatively large amount of
ASCIIDOC formatting changes that are required.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-04 14:12:23 -07:00
Ævar Arnfjörð Bjarmason
844739ba27 git docs: add a category for file formats, protocols and interfaces
Create a new "File formats, protocols and other developer interfaces"
section in the main "git help git" manual page and start moving the
documentation that now lives in "Documentation/technical/*.git" over
to it. This complements the newly added and adjacent "Repository,
command and file interfaces" section.

This makes the technical documentation more accessible and
discoverable. Before this we wouldn't install it by default, and had
no ability to build man page versions of them. The links to them from
our existing documentation link to the generated HTML version of these
docs.

So let's start moving those over, starting with just the
"bundle-format.txt" documentation added in 7378ec90e1 (doc: describe
Git bundle format, 2020-02-07). We'll now have a new
gitformat-bundle(5) man page. Subsequent commits will move more git
internal format documentation over.

Unfortunately the syntax of the current Documentation/technical/*.txt
is not the same (when it comes to section headings etc.) as our
Documentation/*.txt documentation, so change the relevant bits of
syntax as we're moving this over.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-04 14:12:23 -07:00
Ævar Arnfjörð Bjarmason
d976c5100f git docs: add a category for user-facing file, repo and command UX
Create a new "Repository, command and file interfaces" section in the
main "git help git" manual page. Move things that belong under this
new criteria from the generic "Guides" section.

The "Guides" section was added in f442f28a81 (git.txt: add list of
guides, 2020-08-05). It makes sense to have e.g. "giteveryday(7)" and
"gitfaq(7)" listed under "Guides".

But placing e.g. "gitignore(5)" in it is stretching the meaning of
what a "guide" is, ideally that section should list things similar to
"giteveryday(7)" and "gitcore-tutorial(7)".

An alternate name that was considered for this new section was "User
formats", for consistency with the nomenclature used for man section 5
in general. My man(1) lists it as "File formats and conventions,
e.g. /etc/passwd".

So calling this "git help --formats" or "git help --user-formats"
would make sense for e.g. gitignore(5), but would be stretching it
somewhat for githooks(5), and would seem really suspect for the likes
of gitcli(7).

Let's instead pick a name that's closer to the generic term "User
interface", which is really what this documentation discusses: General
user-interface documentation that doesn't obviously belong elsewhere.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-04 14:12:23 -07:00
Junio C Hamano
8f6b482d24 Merge branch 'ac/bitmap-format-doc' into maint
Adjust technical/bitmap-format to be formatted by AsciiDoc, and
add some missing information to the documentation.
source: <pull.1246.v4.git.1655355834.gitgitgadget@gmail.com>

* ac/bitmap-format-doc:
  bitmap-format.txt: add information for trailing checksum
  bitmap-format.txt: fix some formatting issues
  bitmap-format.txt: feed the file to asciidoc to generate html
2022-07-27 13:00:31 -07:00
Junio C Hamano
5dbbdaac79 Merge branch 'ac/bitmap-format-doc'
Adjust technical/bitmap-format to be formatted by AsciiDoc, and
add some missing information to the documentation.

* ac/bitmap-format-doc:
  bitmap-format.txt: add information for trailing checksum
  bitmap-format.txt: fix some formatting issues
  bitmap-format.txt: feed the file to asciidoc to generate html
2022-07-11 15:38:50 -07:00
Abhradeep Chakraborty
accf237ab5 bitmap-format.txt: feed the file to asciidoc to generate html
Documentation/Makefile does not include bitmap-format.txt to generate
a html page using asciidoc.

Teach Documentation/Makefile to also generate a html page for
Documentation/technical/bitmap-format.txt file.

Signed-off-by: Abhradeep Chakraborty <chakrabortyabhradeep79@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-06-16 11:48:49 -07:00
Junio C Hamano
a50036da1a Merge branch 'tb/cruft-packs'
A mechanism to pack unreachable objects into a "cruft pack",
instead of ejecting them into loose form to be reclaimed later, has
been introduced.

* tb/cruft-packs:
  sha1-file.c: don't freshen cruft packs
  builtin/gc.c: conditionally avoid pruning objects via loose
  builtin/repack.c: add cruft packs to MIDX during geometric repack
  builtin/repack.c: use named flags for existing_packs
  builtin/repack.c: allow configuring cruft pack generation
  builtin/repack.c: support generating a cruft pack
  builtin/pack-objects.c: --cruft with expiration
  reachable: report precise timestamps from objects in cruft packs
  reachable: add options to add_unseen_recent_objects_to_traversal
  builtin/pack-objects.c: --cruft without expiration
  builtin/pack-objects.c: return from create_object_entry()
  t/helper: add 'pack-mtimes' test-tool
  pack-mtimes: support writing pack .mtimes files
  chunk-format.h: extract oid_version()
  pack-write: pass 'struct packing_data' to 'stage_tmp_packfiles'
  pack-mtimes: support reading .mtimes files
  Documentation/technical: add cruft-packs.txt
2022-06-03 14:30:37 -07:00
Junio C Hamano
7ec4a9e74f Merge branch 'cg/tools-for-git-doc'
A new doc that lists tips for tools to work with Git's codebase.

* cg/tools-for-git-doc:
  Documentation/ToolsForGit.txt: Tools for developing Git
2022-05-26 14:51:31 -07:00
Taylor Blau
3d89a8c118 Documentation/technical: add cruft-packs.txt
Create a technical document to explain cruft packs. It contains a brief
overview of the problem, some background, details on the implementation,
and a couple of alternative approaches not considered here.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-05-20 22:31:21 -07:00
Junio C Hamano
123dfdff0d Merge branch 'fr/vimdiff-layout'
Reimplement "vimdiff[123]" mergetool drivers with a more generic
layout mechanism.

* fr/vimdiff-layout:
  mergetools: add description to all diff/merge tools
  vimdiff: add tool documentation
  vimdiff: integrate layout tests in the unit tests framework ('t' folder)
  vimdiff: new implementation with layout support
2022-05-10 17:41:11 -07:00
COGONI Guillaume
7a06a854ee Documentation/ToolsForGit.txt: Tools for developing Git
This document gathers tips, scripts and configuration file to help
people working on Git’s codebase use their favorite tools while
following Git’s coding style.

Move the part about Emacs configuration from CodingGuidelines to
ToolsForGit.txt because it's the purpose of the new file centralize the
information about tools.

But, add a mention to Documentation/ToolsForGit.txt in CodingGuidelines
because there is also information about the coding style in it.

Helped-by: Matthieu Moy <Matthieu.Moy@univ-lyon1.fr>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: COGONI Guillaume <cogoni.guillaume@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-04-21 09:50:25 -07:00
Ævar Arnfjörð Bjarmason
8af0699b7a Documentation/Makefile: fix "make info" regression in dad9cd7d51
Fix a regression in my dad9cd7d51 (Makefile: move ".SUFFIXES" rule to
shared.mak, 2022-03-03). As explained in the GNU make documentation
for the $* variable, available at:

	info make --index-search='$*'

This rule relied on ".texi" being in the default list of suffixes, as
seen at:

	make -f/dev/null -p | grep -v -e ^# -e ^$|grep -F .SUFFIXES

The documentation explains what was going on here:

	In an explicit rule, there is no stem; so '$*' cannot be determined
	in that way.  Instead, if the target name ends with a recognized
	suffix (*note Old-Fashioned Suffix Rules: Suffix Rules.), '$*' is
	set to the target name minus the suffix.  For example, if the
	target name is 'foo.c', then '$*' is set to 'foo', since '.c' is a
	suffix.  GNU 'make' does this bizarre thing only for compatibility
	with other implementations of 'make'.  You should generally avoid
	using '$*' except in implicit rules or static pattern rules.

	If the target name in an explicit rule does not end with a
	recognized suffix, '$*' is set to the empty string for that rule.

I.e. this rule added back in 5cefc33bff (Documentation: add
gitman.info target, 2007-12-10) was resolving gitman.texi from
gitman.info. We can instead just use the more obvious $< variable
referring to the prerequisite.

This was the only use of $* in our Makefiles in an explicit rule, the
three remaining ones are all implicit rules, and therefore didn't
depend on the ".SUFFIXES" list.

Reported-by: Adam Dinwoodie <adam@dinwoodie.org>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Tested-by: Adam Dinwoodie <adam@dinwoodie.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-04-06 09:43:48 -07:00
Fernando Ramos
7b5cf8be18 vimdiff: add tool documentation
Running 'git {merge,diff}tool --tool-help' now also prints usage
information about the vimdiff tool (and its variants) instead of just
its name.

Two new functions ('diff_cmd_help()' and 'merge_cmd_help()') have been
added to the set of functions that each merge tool (ie. scripts found
inside "mergetools/") can overwrite to provided tool specific
information.

Right now, only 'mergetools/vimdiff' implements these functions, but
other tools are encouraged to do so in the future, specially if they
take configuration options not explained anywhere else (as it is the
case with the 'vimdiff' tool and the new 'layout' option)

Note that the function 'show_tool_names', used in the implementation of
'git mergetool --tool-help', is also used in Documentation/Makefile to
generate the list of allowed values for the configuration variables
'{diff,merge}.{gui,}tool'. Adjust the rule so its output is an Asciidoc
"description list" instead of a plain list, with the tool name as the
item and the newly added tool description as the description.

In addition, a section has been added to
"Documentation/git-mergetool.txt" to explain the new "layout"
configuration option with examples.

Helped-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Fernando Ramos <greenfoo@u92.eu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-04-03 15:09:52 -07:00
Ævar Arnfjörð Bjarmason
0b6d0bc924 Makefiles: add and use wildcard "mkdir -p" template
Add a template to do the "mkdir -p" of $(@D) (the parent dir of $@)
for us, and use it for the "make lint-docs" targets I added in
8650c6298c (doc lint: make "lint-docs" non-.PHONY, 2021-10-15).

As seen in 4c64fb5aad (Documentation/Makefile: fix lint-docs mkdir
dependency, 2021-10-26) maintaining these manual lists of parent
directory dependencies is fragile, in addition to being obviously
verbose.

I used this pattern at the time because I couldn't find another method
than "order-only" prerequisites to avoid doing a "mkdir -p $(@D)" for
every file being created, which as noted in [1] would be significantly
slower.

But as it turns out we can use this neat trick of only doing a "mkdir
-p" if the $(wildcard) macro tells us the path doesn't exist. A re-run
of a performance test similar to that noted downthread of [1] in [2]
shows that this is faster, in addition to being less verbose and more
reliable (this uses my "git-hyperfine" thin wrapper for "hyperfine"[3]):

    $ git -c hyperfine.hook.setup= hyperfine -L rev HEAD~1,HEAD~0 -s 'make -C Documentation lint-docs' -p 'rm -rf Documentation/.build' 'make -C Documentation -j1 lint-docs'
    Benchmark 1: make -C Documentation -j1 lint-docs' in 'HEAD~1
      Time (mean ± σ):      2.914 s ±  0.062 s    [User: 2.449 s, System: 0.489 s]
      Range (min … max):    2.834 s …  3.020 s    10 runs

    Benchmark 2: make -C Documentation -j1 lint-docs' in 'HEAD~0
      Time (mean ± σ):      2.315 s ±  0.062 s    [User: 1.950 s, System: 0.386 s]
      Range (min … max):    2.229 s …  2.397 s    10 runs

    Summary
      'make -C Documentation -j1 lint-docs' in 'HEAD~0' ran
        1.26 ± 0.04 times faster than 'make -C Documentation -j1 lint-docs' in 'HEAD~1'

So let's use that pattern both for the "lint-docs" target, and a few
miscellaneous other targets.

This method of creating parent directories is explicitly racy in that
we don't know if we're going to say always create a "foo" followed by
a "foo/bar" under parallelism, or skip the "foo" because we created
"foo/bar" first. In this case it doesn't matter for anything except
that we aren't guaranteed to get the same number of rules firing when
running make in parallel.

1. https://lore.kernel.org/git/211028.861r45y3pt.gmgdl@evledraar.gmail.com/
2. https://lore.kernel.org/git/211028.86o879vvtp.gmgdl@evledraar.gmail.com/
3. https://gitlab.com/avar/git-hyperfine/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-03-03 14:14:55 -08:00
Ævar Arnfjörð Bjarmason
a9fda017f4 Makefile: add "$(QUIET)" boilerplate to shared.mak
The $(QUIET) variables we define are largely duplicated between our
various Makefiles, let's define them in the new "shared.mak" instead.

Since we're not using the environment to pass these around we don't
need to export the "QUIET_GEN" and "QUIET_BUILT_IN" variables
anymore. The "QUIET_GEN" variable is used in "git-gui/Makefile" and
"gitweb/Makefile", but they've got their own definition for those. The
"QUIET_BUILT_IN" variable is only used in the top-level "Makefile". We
still need to export the "V" variable.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-03-03 14:14:55 -08:00
Ævar Arnfjörð Bjarmason
8df786d298 Makefiles: add "shared.mak", move ".DELETE_ON_ERROR" to it
We have various behavior that's shared across our Makefiles, or that
really should be (e.g. via defined templates). Let's create a
top-level "shared.mak" to house those sorts of things, and start by
adding the ".DELETE_ON_ERROR" flag to it.

See my own 7b76d6bf22 (Makefile: add and use the ".DELETE_ON_ERROR"
flag, 2021-06-29) and db10fc6c09 (doc: simplify Makefile using
.DELETE_ON_ERROR, 2021-05-21) for the addition and use of the
".DELETE_ON_ERROR" flag.

I.e. this changes the behavior of existing rules in the altered
Makefiles (except "Makefile" & "Documentation/Makefile"). I'm
confident that this is safe having read the relevant rules in those
Makfiles, and as the GNU make manual notes that it isn't the default
behavior is out of an abundance of backwards compatibility
caution. From edition 0.75 of its manual, covering GNU make 4.3:

    [Enabling '.DELETE_ON_ERROR' is] almost always what you want
    'make' to do, but it is not historical practice; so for
    compatibility, you must explicitly request it.

This doesn't introduce a bug by e.g. having this
".DELETE_ON_ERROR" flag only apply to this new shared.mak, Makefiles
have no such scoping semantics.

It does increase the danger that any Makefile without an explicit "The
default target of this Makefile is..." snippet to define the default
target as "all" could have its default rule changed if our new
shared.mak ever defines a "real" rule. In subsequent commits we'll be
careful not to do that, and such breakage would be obvious e.g. in the
case of "make -C t".

We might want to make that less fragile still (e.g. by using
".DEFAULT_GOAL" as noted in the preceding commit), but for now let's
simply include "shared.mak" without adding that boilerplate to all the
Makefiles that don't have it already. Most of those are already
exposed to that potential caveat e.g. due to including "config.mak*".

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-03-03 14:14:55 -08:00
Junio C Hamano
dacf0acdf6 Merge branch 'ab/fix-make-lint-docs'
Hotfix for a topic recently merged to 'master'.

* ab/fix-make-lint-docs:
  Documentation/Makefile: fix lint-docs mkdir dependency
2021-10-29 15:43:13 -07:00
Jeff King
4c64fb5aad Documentation/Makefile: fix lint-docs mkdir dependency
Since 8650c6298c (doc lint: make "lint-docs" non-.PHONY, 2021-10-15), we
put the output for gitlink linter into .build/lint-docs/gitlink. There
are order-only dependencies to create the sequence of subdirs like:

  .build/lint-docs: | .build
          $(QUIET)mkdir $@
  .build/lint-docs/gitlink: | .build/lint-docs
          $(QUIET)mkdir $@

where each level has to depend on the prior one (since the parent
directory must exist for us to create something inside it). But the
"howto" and "config" subdirectories of gitlink have the wrong
dependency; they depend on "lint-docs", not "lint-docs/gitlink".

This usually works out, because the LINT_DOCS_GITLINK targets which
depend on "gitlink/howto" also depend on just "gitlink", so the
directory gets created anyway. But since we haven't given make an
explicit ordering, things can racily happen out of order.

If you stick a "sleep 1" in the rule to build "gitlink" like this:

   ## Lint: gitlink
   .build/lint-docs/gitlink: | .build/lint-docs
  -	$(QUIET)mkdir $@
  +	$(QUIET)sleep 1 && mkdir $@

then "make clean; make lint-docs" will fail reliably. Or you can see it
as-is just by building the directory in isolation:

  $ make clean
  [...]
  $ make .build/lint-docs/gitlink/howto
      GEN mergetools-list.made
      GEN cmd-list.made
      GEN doc.dep
      SUBDIR ../
  make[1]: 'GIT-VERSION-FILE' is up to date.
      SUBDIR ../
  make[1]: 'GIT-VERSION-FILE' is up to date.
  mkdir: cannot create directory ‘.build/lint-docs/gitlink/howto’: No such file or directory
  make: *** [Makefile:476: .build/lint-docs/gitlink/howto] Error 1

The fix is easy: we just need to depend on the correct parent directory.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-10-27 16:57:14 -07:00
Junio C Hamano
63ec2297d2 Merge branch 'ab/fix-make-lint-docs'
Build fix.

* ab/fix-make-lint-docs:
  doc lint: make "lint-docs" non-.PHONY
  doc build: speed up "make lint-docs"
  doc lint: emit errors on STDERR
  doc lint: fix error-hiding regression
2021-10-25 16:07:01 -07:00
Junio C Hamano
f217f6d1d1 Merge branch 'tz/doc-link-to-bundle-format-fix'
Doc update.

* tz/doc-link-to-bundle-format-fix:
  doc: add bundle-format to TECH_DOCS
2021-10-18 15:47:59 -07:00
Ævar Arnfjörð Bjarmason
8650c6298c doc lint: make "lint-docs" non-.PHONY
Speed up the "lint-docs" target by making it non-.PHONY. Similar to my
c234e8a0ec (Makefile: make the "sparse" target non-.PHONY,
2021-09-23). We'll now create empty files corresponding to a
dependency graph for each of these lint scripts.

This speeds things up a bit[1], and makes the output correspond to any
in-tree changes we have:

    $ touch git-add.txt; make lint-docs; make lint-docs
        GEN cmd-list.made
        GEN doc.dep
        LINT GITLINK git-add.txt
        LINT MAN END git-add.txt
        LINT MAN SEC git-add.txt
    make: Nothing to be done for 'lint-docs'.

As with the "sparse" target changes this has a hard dependency on the
use of ".DELETE_ON_ERROR" in the Makefile, added here in
db10fc6c09 (doc: simplify Makefile using .DELETE_ON_ERROR,
2021-05-21). This method also depends on the output for us emitting
any errors on STDERR (fixed in a preceding commit), as well us these
scripts exiting with non-zero on any errors (which they were already
doing).

1.
$ git show HEAD~:Documentation/Makefile >Makefile.old
$ hyperfine --warmup 2 -L f ",.old" 'make -j1 -f Makefile{f} lint-docs'
Benchmark #1: make -j1 -f Makefile lint-docs
  Time (mean ± σ):      60.8 ms ±   1.4 ms    [User: 58.7 ms, System: 2.5 ms]
  Range (min … max):    58.9 ms …  64.0 ms    48 runs

Benchmark #2: make -j1 -f Makefile.old lint-docs
  Time (mean ± σ):      84.0 ms ±   1.5 ms    [User: 78.6 ms, System: 5.7 ms]
  Range (min … max):    81.8 ms …  87.8 ms    35 runs

Summary
  'make -j1 -f Makefile lint-docs' ran
    1.38 ± 0.04 times faster than 'make -j1 -f Makefile.old lint-docs'

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-10-15 10:29:11 -07:00
Ævar Arnfjörð Bjarmason
8cc804d0ab doc build: speed up "make lint-docs"
Extend the trick we use to speed up the "clean" target to also extend
to the "lint-docs" target. See 54df87555b (Documentation/Makefile:
conditionally include doc.dep, 2020-12-08) for the "clean"
implementation.

The "doc-lint" target only depends on *.txt files, so we don't need to
generate GIT-VERSION-FILE etc. if that's all we're doing. This makes
the "make lint-docs" target more than 2x as fast:

$ git show HEAD~:Documentation/Makefile >Makefile.old
$ hyperfine -L f ",.old" 'make -f Makefile{f} lint-docs'
Benchmark #1: make -f Makefile lint-docs
  Time (mean ± σ):     100.2 ms ±   1.3 ms    [User: 93.7 ms, System: 6.7 ms]
  Range (min … max):    98.4 ms … 103.1 ms    29 runs

Benchmark #2: make -f Makefile.old lint-docs
  Time (mean ± σ):     220.0 ms ±  20.0 ms    [User: 206.0 ms, System: 18.0 ms]
  Range (min … max):   206.6 ms … 267.5 ms    11 runs

Summary
  'make -f Makefile lint-docs' ran
    2.19 ± 0.20 times faster than 'make -f Makefile.old lint-docs'

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-10-15 10:20:21 -07:00
Ævar Arnfjörð Bjarmason
7e19e2efa9 doc lint: fix error-hiding regression
Fix the broken "make lint-docs" (or "make check-docs" at the
top-level) target, which has been broken since my cafd9828e8 (doc
lint: lint and fix missing "GIT" end sections, 2021-04-09).

The CI for "seen" is emitting an error about a broken gitlink, but due
to there being 3x scripts chained via ";" instead of "&&" we're not
carrying forward the non-zero exit code.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-10-15 10:16:36 -07:00
Todd Zullinger
6e4fd8bfcd doc: add bundle-format to TECH_DOCS
A link to the bundle-format was added in 5c8273d57c (bundle doc: rewrite
the "DESCRIPTION" section, 2021-07-31).

Ensure `technical/bundle-format.html` is created to avoid a broken link
in `git-bundle.html`.

Signed-off-by: Todd Zullinger <tmz@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-10-13 11:05:04 -07:00
Felipe Contreras
7ba3016729 doc: avoid using rm directly
That's what we have $(RM) for.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-05-24 18:08:22 +09:00
Felipe Contreras
db10fc6c09 doc: simplify Makefile using .DELETE_ON_ERROR
Currently GNU make already removes files when catching an interruption
signal, however, in order to deal with other kinds of errors a
workaround is in place to store target output to a temporary file, and
only move it to its right place on success.

By enabling the built-in .DELETE_ON_ERROR we let make do this task, so
we don't have to.

This way the rules can be simplified a lot.

Suggested-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-05-24 18:08:22 +09:00
Felipe Contreras
471e7b2cf6 doc: remove unnecessary rm instances
Commits 50cff52f1a (When generating manpages, delete outdated targets
first., 2007-08-02) and f9286765b2 (Documentation/Makefile: remove
cmd-list.made before redirecting to it., 2007-08-06) created these rm
instances for a very rare corner-case: building as root by mistake.

It's odd to have workarounds here, but nowhere else in the Makefile--
which already fails in this stuation, starting from
Documentation/technical/.

We gain nothing but complexity, so let's remove them.

Comments-by: Jeff King <peff@peff.net>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-05-24 18:08:22 +09:00
Felipe Contreras
56da21392b doc: improve asciidoc dependencies
asciidoc needs asciidoc.conf, asciidoctor asciidoctor-extensions.rb.

Neither needs the other.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-05-24 18:08:22 +09:00
Felipe Contreras
12d078ed2b doc: refactor common asciidoc dependencies
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-05-24 18:08:21 +09:00
Junio C Hamano
5a357fa477 Merge branch 'ab/doc-lint'
Dev support.

* ab/doc-lint:
  docs: fix linting issues due to incorrect relative section order
  doc lint: lint relative section order
  doc lint: lint and fix missing "GIT" end sections
  doc lint: fix bugs in, simplify and improve lint script
  doc lint: Perl "strict" and "warnings" in lint-gitlink.perl
  Documentation/Makefile: make doc.dep dependencies a variable again
  Documentation/Makefile: make $(wildcard howto/*.txt) a var
2021-05-07 12:47:40 +09:00
Matheus Tavares
68e66f2987 parallel-checkout: add design documentation
Co-authored-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-04-19 15:05:25 -07:00
Ævar Arnfjörð Bjarmason
ea8b9271b1 doc lint: lint relative section order
Add a linting script to check the relative order of the sections in
the documentation. We should have NAME, then SYNOPSIS, DESCRIPTION,
OPTIONS etc. in that order.

That holds true throughout our documentation, except for a few
exceptions which are hardcoded in the linting script.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-04-10 23:36:34 -07:00