Commit Graph

14908 Commits

Author SHA1 Message Date
Junio C Hamano
66077a29e1 Merge branch 'kh/doc-interpret-trailers-updates'
Doc update.

* kh/doc-interpret-trailers-updates:
  doc: interpret-trailers: fix example
  doc: interpret-trailers: don’t use deprecated config
  doc: interpret-trailers: use input redirection
  doc: interpret-trailers: don’t use heredoc in examples
2023-05-15 13:59:03 -07:00
Junio C Hamano
64477d20d7 Merge branch 'mc/send-email-header-cmd'
"git send-email" learned "--header-cmd=<cmd>" that can inject
arbitrary e-mail header lines to the outgoing messages.

* mc/send-email-header-cmd:
  send-email: detect empty blank lines in command output
  send-email: add --header-cmd, --no-header-cmd options
  send-email: extract execute_cmd from recipients_cmd
2023-05-15 13:59:03 -07:00
Junio C Hamano
b14a73097c Merge branch 'jc/doc-clarify-git-default-hash-variable'
The documentation was misleading about the interaction between
GIT_DEFAULT_HASH and "git clone", which has been clarified to
stress that the variable is to be ignored by the command.

* jc/doc-clarify-git-default-hash-variable:
  doc: GIT_DEFAULT_HASH is and will be ignored during "clone"
2023-05-15 13:59:03 -07:00
Junio C Hamano
91428f078b The eighteenth batch
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-10 10:23:29 -07:00
Junio C Hamano
f7947450de Merge branch 'sd/doc-gitignore-and-rm-cached'
Doc update.

* sd/doc-gitignore-and-rm-cached:
  docs: clarify git rm --cached function in gitignore note
2023-05-10 10:23:29 -07:00
Junio C Hamano
40a5d2b79b Merge branch 'fc/doc-man-lift-title-length-limit'
The titles of manual pages used to be chomped at an unreasonably
short limit, which has been removed.

* fc/doc-man-lift-title-length-limit:
  doc: manpage: remove maximum title length
2023-05-10 10:23:29 -07:00
Junio C Hamano
8d6d9529cb Merge branch 'fc/doc-drop-custom-callout-format'
Our custom callout formatter is no longer used in the documentation
formatting toolchain, as the upstream default ones give better
output these days.

* fc/doc-drop-custom-callout-format:
  doc: remove custom callouts format
2023-05-10 10:23:29 -07:00
Junio C Hamano
2ca91d1ee0 Merge branch 'mh/credential-oauth-refresh-token'
The credential subsystem learns to help OAuth framework.

* mh/credential-oauth-refresh-token:
  credential: new attribute oauth_refresh_token
2023-05-10 10:23:29 -07:00
Junio C Hamano
c05615e1c5 Merge branch 'ah/doc-attributes-text'
Doc update to clarify how text and eol attributes interact to
specify the end-of-line conversion.

* ah/doc-attributes-text:
  docs: rewrite the documentation of the text and eol attributes
2023-05-10 10:23:28 -07:00
Junio C Hamano
b6e9521956 Merge branch 'ms/send-email-feed-header-to-validate-hook'
"git send-email" learned to give the e-mail headers to the validate
hook by passing an extra argument from the command line.

* ms/send-email-feed-header-to-validate-hook:
  send-email: expose header information to git-send-email's sendemail-validate hook
  send-email: refactor header generation functions
2023-05-10 10:23:28 -07:00
Junio C Hamano
07ac32fff9 Merge branch 'ma/gittutorial-fixes'
Doc fixes.

* ma/gittutorial-fixes:
  gittutorial: wrap literal examples in backticks
  gittutorial: drop early mention of origin
2023-05-10 10:23:27 -07:00
Junio C Hamano
5597cfdf47 The seventeenth batch
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-09 16:45:47 -07:00
Junio C Hamano
53b29442a8 Merge branch 'jw/send-email-update-gmail-insn'
Doc update to drop use of deprecated app-specific password against
gmail.

* jw/send-email-update-gmail-insn:
  send-email docs: Remove mention of discontinued gmail feature
2023-05-09 16:45:46 -07:00
Sohom Datta
0c5308af30 docs: clarify git rm --cached function in gitignore note
Explain to users that the step to untrack a file will not also prevent them
from getting added in the future.

Signed-off-by: Sohom Datta <sohom.datta@learner.manipal.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-03 14:59:34 -07:00
Felipe Contreras
d832f2ac55 doc: manpage: remove maximum title length
DocBook Stylesheets limit the size of the manpage titles for some
reason.

Even some of the longest git commands have no trouble fitting in 80
character terminals, so it's not clear why we would want to limit titles
to 20 characters, especially when modern terminals are much bigger.

For example:

  --- a/git-credential-cache--daemon.1
  +++ b/git-credential-cache--daemon.1
  @@ -1,4 +1,4 @@
  -GIT-CREDENTIAL-CAC(1)             Git Manual             GIT-CREDENTIAL-CAC(1)
  +GIT-CREDENTIAL-CACHE--DAEMON(1)   Git Manual   GIT-CREDENTIAL-CACHE--DAEMON(1)

   NAME
          git-credential-cache--daemon - Temporarily store user credentials in
  @@ -24,4 +24,4 @@ DESCRIPTION
   GIT
          Part of the git(1) suite

  -Git omitted                       2023-05-02             GIT-CREDENTIAL-CAC(1)
  +Git omitted                       2023-05-02   GIT-CREDENTIAL-CACHE--DAEMON(1)

Moreover, asciidoctor manpage backend doesn't limit the title length, so
we probably want to do the same for docbook backends for consistency.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-03 10:58:50 -07:00
Alex Henrie
6696077ace docs: rewrite the documentation of the text and eol attributes
These two sentences are confusing because the description of the text
attribute sounds exactly the same as the description of the text=auto
attribute:

"Setting the text attribute on a path enables end-of-line normalization"

"When text is set to "auto", the path is marked for automatic
end-of-line conversion"

Unless the reader is already familiar with the two variants, there's a
high probability that they will think that "end-of-line normalization"
is the same thing as "automatic end-of-line conversion".

It's also not clear that the phrase "When the file has been committed
with CRLF, no conversion is done" in the paragraph for text=auto does
not apply equally to the bare text attribute which is described earlier.
Moreover, it falsely implies that normalization is only suppressed if
the file has been committed. In fact, running `git add` on a CRLF file,
adding the text=auto attribute to the file, and running `git add` again
does not do anything to the line endings either.

On top of that, in several places the documentation for the eol
attribute sounds like either it does not affect normalization on checkin
or it forces normalization on checkin. It also sounds like setting eol
(or setting a config variable) is required to turn on conversion on
checkout, but the text attribute can turn on conversion on checkout by
itself if eol is unspecified.

Rephrase the documentation of text, text=auto, eol, eol=crlf, and eol=lf
to be clear about how they are the same, how they are different, and in
what cases conversion is performed.

Helped-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-03 09:02:11 -07:00
Felipe Contreras
756991bc88 doc: remove custom callouts format
The code to render callouts for manpages comes from 17 years ago:
776e994af5 (Properly render asciidoc "callouts" in git man pages.,
2006-04-28), and it was needed back then, but DocBook Stylesheets added
support for that in 2008 [1], since 1.74.0 it hasn't been necessary.

What's worse: the format of the upstream callouts is much nicer than our
hacked version.

Compare this:

     $ git diff            (1)
     $ git diff --cached   (2)
     $ git diff HEAD       (3)

  1. Changes in the working tree not yet staged for the next
     commit.
  2. Changes between the index and your last commit; what you
     would be committing if you run git commit without -a
     option.
  3. Changes in the working tree since your last commit; what
     you would be committing if you run git commit -a

To this:

     $ git diff            (1)
     $ git diff --cached   (2)
     $ git diff HEAD       (3)

 1. Changes in the working tree not yet staged for the next commit.
 2. Changes between the index and your last commit; what you would
 be committing if you run git commit without -a option.
 3. Changes in the working tree since your last commit; what you
 would be committing if you run git commit -a

Let's drop our unnecessary inferior custom format and use the official
one.

[1] https://sourceforge.net/p/docbook/code/7842/

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-03 08:42:36 -07:00
Junio C Hamano
69c786637d The sixteenth batch
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-02 10:13:50 -07:00
Junio C Hamano
cf85f4b3bd Merge branch 'jk/blame-fake-commit-label'
The output given by "git blame" that attributes a line to contents
taken from the file specified by the "--contents" option shows it
differently from a line attributed to the working tree file.

* jk/blame-fake-commit-label:
  blame: use different author name for fake commit generated by --contents
2023-05-02 10:13:35 -07:00
Kristoffer Haugsbakk
cbb83daeaf doc: interpret-trailers: fix example
We need to provide `--trailer sign` since the command won’t output
anything if you don’t give it an input and/or a
`--trailer`. Furthermore, the message which already contains an s-o-b is
wrong:

    $ git interpret-trailers --trailer sign <msg.txt
    Signed-off-by: Alice <alice@example.com>

    Signed-off-by: Alice <alice@example.com>

This can’t be what was originally intended.

So change the messages in this example to use the typical
“subject/message” file.

Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-01 13:26:42 -07:00
Kristoffer Haugsbakk
f68c26873d doc: interpret-trailers: don’t use deprecated config
`command` has been deprecated since commit c364b7ef51 (trailer: add new
.cmd config option, 2021-05-03).

Use the commit message of c364b7ef51 as a guide to replace the use of
`$ARG` and to use a script instead of an inline command.[1] Also,
explicitly trigger the command by passing in `--trailer=see`, since
this config is not automatically used.[2]

[1]: “Instead of "$ARG", users can refer to the value as positional
   argument, $1, in their scripts.”
[2]: “At the same time, in order to allow `git interpret-trailers` to
   better simulate the behavior of `git command -s`,
   'trailer.<token>.cmd' will not automatically execute.”

Acked-by: ZheNing Hu <adlternative@gmail.com>
Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-01 13:26:41 -07:00
Kristoffer Haugsbakk
b032a2bfe7 doc: interpret-trailers: use input redirection
Use input redirection instead of invoking cat(1) on a single file. This
is more straightforward, saves a process, and often makes the line
shorter.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-01 13:26:41 -07:00
Kristoffer Haugsbakk
c892bcc944 doc: interpret-trailers: don’t use heredoc in examples
This file contains four instances of trailing spaces from its inception
in commit [1]. These spaces might be intentional, since a user would be
prompted with `> ` in an interactive session. On the one hand, this is a
whitespace error according to `git diff --check`; on the other hand, the
raw documentation—it makes no difference in the rendered output—is just
staying faithful to the simulation of the interactive prompt.

Let’s get rid of these whitespace errors and also make the examples more
friendly to cut-and-paste by replacing the heredocs with files which are
shown with cat(1).

[1]: dfd66ddf5a (Documentation: add documentation for 'git
    interpret-trailers', 2014-10-13)

Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-01 13:26:41 -07:00
Maxim Cournoyer
ba92106e93 send-email: add --header-cmd, --no-header-cmd options
Sometimes, adding a header different than CC or TO is desirable; for
example, when using Debbugs, it is best to use 'X-Debbugs-Cc' headers
to keep people in CC; this is an example use case enabled by the new
'--header-cmd' option.

The header unfolding logic is extracted to a subroutine so that it can
be reused; a test is added for coverage.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-05-01 08:55:52 -07:00
Junio C Hamano
48d89b51b3 The fifteenth batch
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-28 16:03:03 -07:00
Junio C Hamano
fc23c397c7 Merge branch 'tb/enable-cruft-packs-by-default'
When "gc" needs to retain unreachable objects, packing them into
cruft packs (instead of exploding them into loose object files) has
been offered as a more efficient option for some time.  Now the use
of cruft packs has been made the default and no longer considered
an experimental feature.

* tb/enable-cruft-packs-by-default:
  repository.h: drop unused `gc_cruft_packs`
  builtin/gc.c: make `gc.cruftPacks` enabled by default
  t/t9300-fast-import.sh: prepare for `gc --cruft` by default
  t/t6500-gc.sh: add additional test cases
  t/t6500-gc.sh: refactor cruft pack tests
  t/t6501-freshen-objects.sh: prepare for `gc --cruft` by default
  t/t5304-prune.sh: prepare for `gc --cruft` by default
  builtin/gc.c: ignore cruft packs with `--keep-largest-pack`
  builtin/repack.c: fix incorrect reference to '-C'
  pack-write.c: plug a leak in stage_tmp_packfiles()
2023-04-28 16:03:03 -07:00
Jouke Witteveen
839ebad442 send-email docs: Remove mention of discontinued gmail feature
Support for "less secure apps" ended May 30, 2022.

This effectively reverts 155067a (git-send-email.txt: mention less secure
app access with Gmail, 2021-01-08).

Signed-off-by: Jouke Witteveen <j.witteveen@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-28 13:46:58 -07:00
Junio C Hamano
f85cd430b1 The fourteenth batch
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-27 16:00:59 -07:00
Junio C Hamano
57a3b971e9 Merge branch 'fc/doc-checkout-markup-updates'
Doc mark-up update.

* fc/doc-checkout-markup-updates:
  doc: git-checkout: reorganize examples
  doc: git-checkout: trivial callout cleanup
2023-04-27 16:00:59 -07:00
Junio C Hamano
d6661e6843 Merge branch 'fc/doc-use-datestamp-in-commit'
Instead of the time the formatter was run, show the timestamp
recorded in the commit in the documentation.

* fc/doc-use-datestamp-in-commit:
  doc: set actual revdate for manpages
2023-04-27 16:00:59 -07:00
Junio C Hamano
849c8b3dbf Merge branch 'tb/pack-revindex-on-disk'
The on-disk reverse index that allows mapping from the pack offset
to the object name for the object stored at the offset has been
enabled by default.

* tb/pack-revindex-on-disk:
  t: invert `GIT_TEST_WRITE_REV_INDEX`
  config: enable `pack.writeReverseIndex` by default
  pack-revindex: introduce `pack.readReverseIndex`
  pack-revindex: introduce GIT_TEST_REV_INDEX_DIE_ON_DISK
  pack-revindex: make `load_pack_revindex` take a repository
  t5325: mark as leak-free
  pack-write.c: plug a leak in stage_tmp_packfiles()
2023-04-27 16:00:59 -07:00
Junio C Hamano
5f0e37b4c1 doc: GIT_DEFAULT_HASH is and will be ignored during "clone"
The phrasing "is currently ignored" was prone to be misinterpreted
as if we were wishing if it were honored.  Rephrase it to make it
clear that the experimental variable will be ignored.

In the longer term, after/when we allow incremental/over-the-wire
migration of the object-format, i.e. cloning from an SHA-1
repository to create an SHA-256 repository (or vice versa) and
fetching and pushing between them would bidirectionally convert the
object format on the fly, it is likely that we would teach a new
option "--object-format" to "git clone" to say "you would use
whatever object format the origin uses by default, but this time, I
am telling you to use this format on our side, doing on-the-fly
object format conversion as needed".  So it is perfectly OK to
ignore the settings of this experimental variable, even after such
an extension happens that makes it necessary for us to have a way to
create a new repository that uses different object format from the
origin repository.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-26 08:17:04 -07:00
Junio C Hamano
2807bd2c10 The thirteenth batch
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-25 13:56:20 -07:00
Junio C Hamano
c4c9d5586f Merge branch 'rj/send-email-validate-hook-count-messages'
The sendemail-validate validate hook learned to pass the total
number of input files and where in the sequence each invocation is
via environment variables.

* rj/send-email-validate-hook-count-messages:
  send-email: export patch counters in validate environment
2023-04-25 13:56:20 -07:00
Junio C Hamano
9ce9dea4e1 Sync with Git 2.40.1 2023-04-24 22:31:32 -07:00
Jacob Keller
603d0fdce2 blame: use different author name for fake commit generated by --contents
When the --contents option is used with git blame, and the contents of
the file have lines which can't be annotated by the history being
blamed, the user will see an author of "Not Committed Yet". This is
similar to the way blame handles working tree contents when blaming
without a revision.

This is slightly confusing since this data isn't the working copy and
while it is technically "not committed yet", its also coming from an
external file. Replace this author name with "External file
(--contents)" to better differentiate such lines from actual working
copy lines.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Suggested-by: Glen Choo <chooglen@google.com>
Signed-off-by: Jacob Keller <jacob.keller@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-24 15:16:31 -07:00
Junio C Hamano
7580f92ffa The twelfth batch
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-21 15:35:09 -07:00
Junio C Hamano
b64894c206 Merge branch 'ow/ref-filter-omit-empty'
"git branch --format=..." and "git format-patch --format=..."
learns "--omit-empty" to hide refs that whose formatting result
becomes an empty string from the output.

* ow/ref-filter-omit-empty:
  branch, for-each-ref, tag: add option to omit empty lines
2023-04-21 15:35:05 -07:00
Junio C Hamano
9e0d1aa495 Merge branch 'ah/format-patch-thread-doc'
Doc update.

* ah/format-patch-thread-doc:
  format-patch: correct documentation of --thread without an argument
2023-04-21 15:35:05 -07:00
Junio C Hamano
09a7b61c1d Merge branch 'fc/doc-stop-using-manversion'
Doc build simplification.

* fc/doc-stop-using-manversion:
  doc: simplify man version
2023-04-21 15:35:04 -07:00
M Hickford
a5c76569e7 credential: new attribute oauth_refresh_token
Git authentication with OAuth access token is supported by every popular
Git host including GitHub, GitLab and BitBucket [1][2][3]. Credential
helpers Git Credential Manager (GCM) and git-credential-oauth generate
OAuth credentials [4][5]. Following RFC 6749, the application prints a
link for the user to authorize access in browser. A loopback redirect
communicates the response including access token to the application.

For security, RFC 6749 recommends that OAuth response also includes
expiry date and refresh token [6]. After expiry, applications can use
the refresh token to generate a new access token without user
reauthorization in browser. GitLab and BitBucket set the expiry at two
hours [2][3]. (GitHub doesn't populate expiry or refresh token.)

However the Git credential protocol has no attribute to store the OAuth
refresh token (unrecognised attributes are silently discarded). This
means that the user has to regularly reauthorize the helper in browser.
On a browserless system, this is particularly intrusive, requiring a
second device.

Introduce a new attribute oauth_refresh_token. This is especially
useful when a storage helper and a read-only OAuth helper are configured
together. Recall that `credential fill` calls each helper until it has a
non-expired password.

```
[credential]
	helper = storage  # eg. cache or osxkeychain
	helper = oauth
```

The OAuth helper can use the stored refresh token forwarded by
`credential fill` to generate a fresh access token without opening the
browser. See
https://github.com/hickford/git-credential-oauth/pull/3/files
for an implementation tested with this patch.

Add support for the new attribute to credential-cache. Eventually, I
hope to see support in other popular storage helpers.

Alternatives considered: ask helpers to store all unrecognised
attributes. This seems excessively complex for no obvious gain.
Helpers would also need extra information to distinguish between
confidential and non-confidential attributes.

Workarounds: GCM abuses the helper get/store/erase contract to store the
refresh token during credential *get* as the password for a fictitious
host [7] (I wrote this hack). This workaround is only feasible for a
monolithic helper with its own storage.

[1] https://github.blog/2012-09-21-easier-builds-and-deployments-using-git-over-https-and-oauth/
[2] https://docs.gitlab.com/ee/api/oauth2.html#access-git-over-https-with-access-token
[3] https://support.atlassian.com/bitbucket-cloud/docs/use-oauth-on-bitbucket-cloud/#Cloning-a-repository-with-an-access-token
[4] https://github.com/GitCredentialManager/git-credential-manager
[5] https://github.com/hickford/git-credential-oauth
[6] https://datatracker.ietf.org/doc/html/rfc6749#section-5.1
[7] 66b94e489a/src/shared/GitLab/GitLabHostProvider.cs (L207)

Signed-off-by: M Hickford <mirth.hickford@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-21 09:38:30 -07:00
Martin Ågren
ad353d7e77 gittutorial: wrap literal examples in backticks
Our coding guidelines prefer literal examples to be wrapped in
`backticks` to typeset them in monospace.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-20 14:34:08 -07:00
Martin Ågren
67ceed1f82 gittutorial: drop early mention of origin
We don't have an origin at this point in the tutorial, so "Your branch
is up to date" won't actually show up in the output of `git status`.

This line was introduced in 8942821ec0 ("gittutorial: fix output of 'git
status'", 2014-11-13) in what looks like a mistake -- that commit mostly
just wanted to remove leading '#' characters.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-20 14:34:07 -07:00
Junio C Hamano
9c6990cca2 The eleventh batch
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-20 14:33:36 -07:00
Junio C Hamano
a4a4db8cf7 Merge branch 'gc/better-error-when-local-clone-fails-with-symlink'
"git clone --local" stops copying from an original repository that
has symbolic links inside its $GIT_DIR; an error message when that
happens has been updated.

* gc/better-error-when-local-clone-fails-with-symlink:
  clone: error specifically with --local and symlinked objects
2023-04-20 14:33:36 -07:00
Michael Strawbridge
a8022c5f7b send-email: expose header information to git-send-email's sendemail-validate hook
To allow further flexibility in the Git hook, the SMTP header
information of the email which git-send-email intends to send, is now
passed as the 2nd argument to the sendemail-validate hook.

As an example, this can be useful for acting upon keywords in the
subject or specific email addresses.

Cc: Luben Tuikov <luben.tuikov@amd.com>
Cc: Junio C Hamano <gitster@pobox.com>
Cc: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Acked-by: Luben Tuikov <luben.tuikov@amd.com>
Signed-off-by: Michael Strawbridge <michael.strawbridge@amd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-19 14:19:09 -07:00
Felipe Contreras
8dda6c3de2 doc: git-checkout: reorganize examples
The examples are an ordered list, however, they are complex enough that
a callout is inside example 1, and that confuses the parsers as the list
continuation (`+`) is unclear (are we continuing the previous list item,
or the previous callout?).

We could use an open block as the asciidoctor documentation suggests,
but that has a tiny formatting issue (a newline is missing).

To simplify things for everyone (the reader, the writer, and the parser)
let's use subsections.

After this change, the HTML documentation generated with asciidoc has
the right indentation.

Cc: Jeff King <peff@peff.net>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-18 15:47:13 -07:00
Felipe Contreras
f8bc75a55e doc: git-checkout: trivial callout cleanup
The callouts are directly tied to the listing above, remove spaces to
make it clear they are one and the same.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-18 15:36:36 -07:00
Taylor Blau
e3e24de1bf builtin/gc.c: make gc.cruftPacks enabled by default
Back in 5b92477f89 (builtin/gc.c: conditionally avoid pruning objects
via loose, 2022-05-20), `git gc` learned the `--cruft` option and
`gc.cruftPacks` configuration to opt-in to writing cruft packs when
collecting or pruning unreachable objects.

Cruft packs were introduced with the merge in a50036da1a (Merge branch
'tb/cruft-packs', 2022-06-03). They address the problem of "loose object
explosions", where Git will write out many individual loose objects when
there is a large number of unreachable objects that have not yet aged
past `--prune=<date>`.

Instead of keeping track of those unreachable yet recent objects via
their loose object file's mtime, cruft packs collect all unreachable
objects into a single pack with a corresponding `*.mtimes` file that
acts as a table to store the mtimes of all unreachable objects. This
prevents the need to store unreachable objects as loose as they age out
of the repository, and avoids the problem of loose object explosions.

Beyond avoiding loose object explosions, cruft packs also act as a more
efficient mechanism to store unreachable objects as they age out of a
repository. This is because pairs of similar unreachable objects serve
as delta bases for one another.

In 5b92477f89, the feature was introduced as experimental. Since then,
GitHub has been running these patches in every repository generating
hundreds of millions of cruft packs along the way. The feature is
battle-tested, and avoids many pathological cases such as above. Users
who either run `git gc` manually, or via `git maintenance` can benefit
from having cruft packs.

As such, enable cruft pack generation to take place by default (by
making `gc.cruftPacks` have the default of "true" rather than "false).

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-18 14:56:48 -07:00
Taylor Blau
05b9013b71 builtin/gc.c: ignore cruft packs with --keep-largest-pack
When cruft packs were implemented, we never adjusted the code for `git
gc`'s `--keep-largest-pack` and `gc.bigPackThreshold` to ignore cruft
packs. This option and configuration option share a common
implementation, but including cruft packs is wrong in both cases:

  - Running `git gc --keep-largest-pack` in a repository where the
    largest pack is the cruft pack itself will make it impossible for
    `git gc` to prune objects, since the cruft pack itself is kept.

  - The same is true for `gc.bigPackThreshold`, if the size of the cruft
    pack exceeds the limit set by the caller.

In the future, it is possible that `gc.bigPackThreshold` could be used
to write a separate cruft pack containing any new unreachable objects
that entered the repository since the last time a cruft pack was
written.

There are some complexities to doing so, mainly around handling
pruning objects that are in an existing cruft pack that is above the
threshold (which would either need to be rewritten, or else delay
pruning). Rewriting a substantially similar cruft pack isn't ideal, but
it is significantly better than the status-quo.

If users have large cruft packs that they don't want to rewrite, they
can mark them as `*.keep` packs. But in general, if a repository has a
cruft pack that is so large it is slowing down GC's, it should probably
be pruned anyway.

In the meantime, ignore cruft packs in the common implementation for
both of these options, and add a pair of tests to prevent any future
regressions here.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-04-18 14:56:47 -07:00