git.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Matheus Tavares Bernardino <matheus.bernardino@usp.br>
To: Jonathan Nieder <jrnieder@gmail.com>
Cc: git <git@vger.kernel.org>, Junio C Hamano <gitster@pobox.com>,
	Derrick Stolee <stolee@gmail.com>,
	Elijah Newren <newren@gmail.com>,
	Jonathan Tan <jonathantanmy@google.com>
Subject: Re: [PATCH v4 4/6] config: correctly read worktree configs in submodules
Date: Tue, 1 Sep 2020 18:44:18 -0300	[thread overview]
Message-ID: <CAHd-oW6LA7Ovnu-e9c+WapF-e+JMichWZEetxmnbjCT_H6D0AQ@mail.gmail.com> (raw)
In-Reply-To: <20200901024130.GA3332286@google.com>

Hi, Jonathan

On Mon, Aug 31, 2020 at 11:41 PM Jonathan Nieder <jrnieder@gmail.com> wrote:
>
> Hi,
>
> Matheus Tavares wrote:
>
> > One of the steps in do_git_config_sequence() is to load the
> > worktree-specific config file. Although the function receives a git_dir
> > string, it relies on git_pathdup(), which uses the_repository->git_dir,
> > to make the path to the file. Furthermore, it also checks that
> > extensions.worktreeConfig is set through the
> > repository_format_worktree_config variable, which refers to
> > the_repository only. Thus, when a submodule has worktree-specific
> > settings, a command executed in the superproject that recurses into the
> > submodule won't find the said settings.
>
> I think the above goes out of order: it states the "how" before the
> "what".  Instead, a commit message should lead with the problem the
> change aims to solve.

Thanks. I will reorder these two sections in the commit message.

> Is the idea here that until this patch, we're only able to read
> worktree config from a repository when extensions.worktreeConfig is
> set in the_repository, meaning that
>
> - when examining submodule config in a process where the_repository
>   represents the superproject, we do not read the submodule's worktree
>   config even if extensions.worktreeConfig is set in the submodule,
>   unless the superproject has extensions.worktreeConfig set, and

Right.

> - when examining submodule config in a process where the_repository
>   represents the superproject, we *do* read the submodule's worktree
>   config even if extensions.worktreeConfig is not set in the submodule,
>   if the superproject has extensions.worktreeConfig set, and
>
> ?

Right, but with one change: if extensions.worktreeConfig is not set in
the submodule and it is set in the superproject, the *superproject's*
worktree config is read (independently of which git_dir was given as
argument).

> That sounds like a serious problem indeed.  Thanks for fixing it.
>
> > This will be especially important in the next patch: git-grep will learn
> > to honor sparse checkouts and, when running with --recurse-submodules,
> > the submodule's sparse checkout settings must be loaded. As these
> > settings are stored in the config.worktree file, they would be ignored
> > without this patch. So let's fix this by reading the right
> > config.worktree file and extensions.worktreeConfig setting, based on the
> > git_dir and commondir paths given to do_git_config_sequence(). Also
> > add a test to avoid any regressions.
>
> I see.  I'm not sure that's more important than other cases, but I
> can understand if the problem was noticed in this circumstance. :)
>
> > Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
> > ---
> >  config.c                   | 21 +++++++++---
> >  t/helper/test-config.c     | 67 +++++++++++++++++++++++++++++++++-----
> >  t/t2404-worktree-config.sh | 16 +++++++++
> >  3 files changed, 91 insertions(+), 13 deletions(-)
> >
> > diff --git a/config.c b/config.c
> > index 8db9c77098..c2d56309dc 100644
> > --- a/config.c
> > +++ b/config.c
> > @@ -1747,11 +1747,22 @@ static int do_git_config_sequence(const struct config_options *opts,
> >               ret += git_config_from_file(fn, repo_config, data);
> >
> >       current_parsing_scope = CONFIG_SCOPE_WORKTREE;
> > -     if (!opts->ignore_worktree && repository_format_worktree_config) {
> > +     if (!opts->ignore_worktree && repo_config && opts->git_dir) {
>
> Can we eliminate the repository_format_worktree_config global to save
> the next caller from the same problem?

Hmm, I think it's possible, I will investigate it further.

> > +             struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
> > +             struct strbuf buf = STRBUF_INIT;
> > +
> > +             read_repository_format(&repo_fmt, repo_config);
> > +
> > +             if (!verify_repository_format(&repo_fmt, &buf) &&
> > +                 repo_fmt.worktree_config) {
>
> This undoes the caching the repository_format_worktree_config means to
> do.  Can we cache the value in "struct repository" instead?  That way,
> in the common case where we're reading the_repository, we wouldn't
> experience a slowdown.

Yeah, that would be the best solution. But, unfortunately,
do_git_config_sequence() doesn't receive a complete repository struct,
just the 'commondir' and 'git_dir' strings.

> > -             char *path = git_pathdup("config.worktree");
> > +                     char *path = mkpathdup("%s/config.worktree", opts->git_dir);
>
> Can this use a helper like repo_git_path or strbuf_repo_git_path
> (preferably one using strbuf like the latter)?

Hmm, here we would have the same problem of not having a 'struct
repository' to pass to those functions :(

> [...]
> > +             strbuf_release(&buf);
> > +             clear_repository_format(&repo_fmt);
> >       }
> >
> >       current_parsing_scope = CONFIG_SCOPE_COMMAND;
> > diff --git a/t/helper/test-config.c b/t/helper/test-config.c
> > index 61da2574c5..284f83a921 100644
> > --- a/t/helper/test-config.c
> > +++ b/t/helper/test-config.c
> > @@ -2,12 +2,19 @@
> >  #include "cache.h"
> >  #include "config.h"
> >  #include "string-list.h"
> > +#include "submodule-config.h"
> >
> >  /*
> >   * This program exposes the C API of the configuration mechanism
> >   * as a set of simple commands in order to facilitate testing.
> >   *
> > - * Reads stdin and prints result of command to stdout:
> > + * Usage: test-tool config [--submodule=<path>] <cmd> [<args>]
> > + *
> > + * If --submodule=<path> is given, <cmd> will operate on the submodule at the
> > + * given <path>. This option is not valid for the commands: read_early_config,
> > + * configset_get_value and configset_get_value_multi.
>
> Nice!
>
> [...]
> > @@ -93,7 +102,18 @@ int cmd__config(int argc, const char **argv)
> >       if (argc == 0)
> >               goto print_usage_error;
> >
> > +     if (skip_prefix(*argv, "--submodule=", &subrepo_path)) {
> > +             argc--;
> > +             argv++;
> > +             if (argc == 0)
> > +                     goto print_usage_error;
> > +     }
>
> Can this use the parse_options API?

Right, it would make it easier to add more options in the future.
There is only one consideration, though, about parse_options()'s exit
codes on error, but more on that below...

> > +
> >       if (argc == 2 && !strcmp(argv[0], "read_early_config")) {
> > +             if (subrepo_path) {
> > +                     fprintf(stderr, "Cannot use --submodule with read_early_config\n");
> > +                     return TC_USAGE_ERROR;
>
> Should this use die() or BUG()?

The idea of using TC_USAGE_ERROR (129) here and not die() (128), was
that some users of the test-config helper want to detect die() errors
from the config machinery itself. So by using a different exit code,
we can avoid false positives in these tests. Of course they should
also be checking stderr/stdout, but there is at least one test which
only checks the exit code. Rethinking about that now, instead of using
different exit codes in test-config.c, should we adjust the tests to
use `test_must_fail` and only check stderr/stdout? Then we could use
die() (or BUG()) here, as you suggested, as well as the parse_options
API in the snippet above. Does that sound reasonable?

> > +             }
> >               read_early_config(early_config_cb, (void *)argv[1]);
> >               return TC_SUCCESS;
> >       }
> > @@ -101,8 +121,23 @@ int cmd__config(int argc, const char **argv)
> >       setup_git_directory();
> >       git_configset_init(&cs);
> >
> > +     if (subrepo_path) {
> > +             const struct submodule *sub;
> > +             struct repository *subrepo = xcalloc(1, sizeof(*repo));
>
> nit: this could be scoped to cmd__config:
>
>         struct repository subrepo = {0};

OK, will do. Thanks

> > +
> > +             sub = submodule_from_path(the_repository, &null_oid, subrepo_path);
> > +             if (!sub || repo_submodule_init(subrepo, the_repository, sub)) {
> > +                     fprintf(stderr, "Invalid argument to --submodule: '%s'\n",
> > +                             subrepo_path);
> > +                     free(subrepo);
> > +                     ret = TC_USAGE_ERROR;
>
> Likewise: I think may want to use die() or BUG() (and likewise for other
> USAGE_ERROR cases).
>
> Thanks and hope that helps,
> Jonathan

It did :) Thanks a lot for the comments!

  reply	other threads:[~2020-09-01 21:44 UTC|newest]

Thread overview: 123+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-24  6:04 [RFC PATCH 0/3] grep: honor sparse checkout and add option to ignore it Matheus Tavares
2020-03-24  6:11 ` [RFC PATCH 1/3] doc: grep: unify info on configuration variables Matheus Tavares
2020-03-24  7:57   ` Elijah Newren
2020-03-24 21:26     ` Junio C Hamano
2020-03-24 23:38       ` Matheus Tavares
2020-03-24  6:12 ` [RFC PATCH 2/3] grep: honor sparse checkout patterns Matheus Tavares
2020-03-24  7:15   ` Elijah Newren
2020-03-24 15:12     ` Derrick Stolee
2020-03-24 16:16       ` Elijah Newren
2020-03-24 17:02         ` Derrick Stolee
2020-03-24 23:01       ` Matheus Tavares Bernardino
2020-03-24 22:55     ` Matheus Tavares Bernardino
2020-04-21  2:10       ` Matheus Tavares Bernardino
2020-04-21  3:08         ` Elijah Newren
2020-04-22 12:08           ` Derrick Stolee
2020-04-23  6:09           ` Matheus Tavares Bernardino
2020-03-24  6:13 ` [RFC PATCH 3/3] grep: add option to ignore sparsity patterns Matheus Tavares
2020-03-24  7:54   ` Elijah Newren
2020-03-24 18:30     ` Junio C Hamano
2020-03-24 19:07       ` Elijah Newren
2020-03-25 20:18         ` Junio C Hamano
2020-03-30  3:23       ` Matheus Tavares Bernardino
2020-03-31 19:12         ` Elijah Newren
2020-03-31 20:02           ` Derrick Stolee
2020-04-27 17:15             ` Matheus Tavares Bernardino
2020-04-29 16:46               ` Elijah Newren
2020-04-29 17:21             ` Elijah Newren
2020-03-25 23:15     ` Matheus Tavares Bernardino
2020-03-26  6:02       ` Elijah Newren
2020-03-27 15:51         ` Junio C Hamano
2020-03-27 19:01           ` Elijah Newren
2020-03-30  1:12         ` Matheus Tavares Bernardino
2020-03-31 16:48           ` Elijah Newren
2020-05-10  0:41 ` [RFC PATCH v2 0/4] grep: honor sparse checkout and add option to ignore it Matheus Tavares
2020-05-10  0:41   ` [RFC PATCH v2 1/4] doc: grep: unify info on configuration variables Matheus Tavares
2020-05-10  0:41   ` [RFC PATCH v2 2/4] config: load the correct config.worktree file Matheus Tavares
2020-05-11 19:10     ` Junio C Hamano
2020-05-12 22:55       ` Matheus Tavares Bernardino
2020-05-12 23:22         ` Junio C Hamano
2020-05-10  0:41   ` [RFC PATCH v2 3/4] grep: honor sparse checkout patterns Matheus Tavares
2020-05-11 19:35     ` Junio C Hamano
2020-05-13  0:05       ` Matheus Tavares Bernardino
2020-05-13  0:17         ` Junio C Hamano
2020-05-21  7:26           ` Elijah Newren
2020-05-21 17:35             ` Matheus Tavares Bernardino
2020-05-21 17:52               ` Elijah Newren
2020-05-22  5:49                 ` Matheus Tavares Bernardino
2020-05-22 14:26                   ` Elijah Newren
2020-05-22 15:36                     ` Elijah Newren
2020-05-22 20:54                       ` Matheus Tavares Bernardino
2020-05-22 21:06                         ` Elijah Newren
2020-06-10 11:40                     ` Derrick Stolee
2020-06-10 16:22                       ` Matheus Tavares Bernardino
2020-06-10 17:42                         ` Derrick Stolee
2020-06-10 18:14                           ` Matheus Tavares Bernardino
2020-06-10 20:12                         ` Elijah Newren
2020-06-10 19:58                       ` Elijah Newren
2020-05-21  7:36       ` Elijah Newren
2020-05-10  0:41   ` [RFC PATCH v2 4/4] config: add setting to ignore sparsity patterns in some cmds Matheus Tavares
2020-05-10  4:23     ` Matheus Tavares Bernardino
2020-05-21 17:18       ` Elijah Newren
2020-05-21  7:09     ` Elijah Newren
2020-05-28  1:12   ` [PATCH v3 0/5] grep: honor sparse checkout and add option to ignore it Matheus Tavares
2020-05-28  1:12     ` [PATCH v3 1/5] doc: grep: unify info on configuration variables Matheus Tavares
2020-05-28  1:13     ` [PATCH v3 2/5] t/helper/test-config: return exit codes consistently Matheus Tavares
2020-05-30 14:29       ` Elijah Newren
2020-06-01  4:36         ` Matheus Tavares Bernardino
2020-05-28  1:13     ` [PATCH v3 3/5] config: correctly read worktree configs in submodules Matheus Tavares
2020-05-30 14:49       ` Elijah Newren
2020-06-01  4:38         ` Matheus Tavares Bernardino
2020-05-28  1:13     ` [PATCH v3 4/5] grep: honor sparse checkout patterns Matheus Tavares
2020-05-30 15:48       ` Elijah Newren
2020-06-01  4:44         ` Matheus Tavares Bernardino
2020-06-03  2:38           ` Elijah Newren
2020-06-10 17:08             ` Matheus Tavares Bernardino
2020-05-28  1:13     ` [PATCH v3 5/5] config: add setting to ignore sparsity patterns in some cmds Matheus Tavares
2020-05-30 16:18       ` Elijah Newren
2020-06-01  4:45         ` Matheus Tavares Bernardino
2020-06-03  2:39           ` Elijah Newren
2020-06-10 21:15             ` Matheus Tavares Bernardino
2020-06-11  0:35               ` Elijah Newren
2020-06-12 15:44     ` [PATCH v4 0/6] grep: honor sparse checkout and add option to ignore it Matheus Tavares
2020-06-12 15:44       ` [PATCH v4 1/6] doc: grep: unify info on configuration variables Matheus Tavares
2020-06-12 15:45       ` [PATCH v4 2/6] t/helper/test-config: return exit codes consistently Matheus Tavares
2020-06-12 15:45       ` [PATCH v4 3/6] t/helper/test-config: facilitate addition of new cli options Matheus Tavares
2020-06-12 15:45       ` [PATCH v4 4/6] config: correctly read worktree configs in submodules Matheus Tavares
2020-06-16 19:13         ` Elijah Newren
2020-06-21 16:05           ` Matheus Tavares Bernardino
2020-09-01  2:41         ` Jonathan Nieder
2020-09-01 21:44           ` Matheus Tavares Bernardino [this message]
2020-06-12 15:45       ` [PATCH v4 5/6] grep: honor sparse checkout patterns Matheus Tavares
2020-06-12 15:45       ` [PATCH v4 6/6] config: add setting to ignore sparsity patterns in some cmds Matheus Tavares
2020-06-16 22:31       ` [PATCH v4 0/6] grep: honor sparse checkout and add option to ignore it Elijah Newren
2020-09-02  6:17       ` [PATCH v5 0/8] " Matheus Tavares
2020-09-02  6:17         ` [PATCH v5 1/8] doc: grep: unify info on configuration variables Matheus Tavares
2020-09-02  6:17         ` [PATCH v5 2/8] t1308-config-set: avoid false positives when using test-config Matheus Tavares
2020-09-02  6:57           ` Eric Sunshine
2020-09-02 16:16             ` Matheus Tavares Bernardino
2020-09-02 16:38               ` Eric Sunshine
2020-09-02  6:17         ` [PATCH v5 3/8] t/helper/test-config: be consistent with exit codes Matheus Tavares
2020-09-02  6:17         ` [PATCH v5 4/8] t/helper/test-config: check argc before accessing argv Matheus Tavares
2020-09-02  7:18           ` Eric Sunshine
2020-09-02  6:17         ` [PATCH v5 5/8] t/helper/test-config: unify exit labels Matheus Tavares
2020-09-02  7:30           ` Eric Sunshine
2020-09-02  6:17         ` [PATCH v5 6/8] config: correctly read worktree configs in submodules Matheus Tavares
2020-09-02 20:15           ` Jonathan Nieder
2020-09-09 13:04             ` Matheus Tavares Bernardino
2020-09-09 23:32               ` Jonathan Nieder
2020-09-02  6:17         ` [PATCH v5 7/8] grep: honor sparse checkout patterns Matheus Tavares
2020-09-02  6:17         ` [PATCH v5 8/8] config: add setting to ignore sparsity patterns in some cmds Matheus Tavares
2020-09-10 17:21         ` [PATCH v6 0/9] grep: honor sparse checkout and add option to ignore it Matheus Tavares
2020-09-10 17:21           ` [PATCH v6 1/9] doc: grep: unify info on configuration variables Matheus Tavares
2020-09-10 17:21           ` [PATCH v6 2/9] t1308-config-set: avoid false positives when using test-config Matheus Tavares
2020-09-10 17:21           ` [PATCH v6 3/9] t/helper/test-config: be consistent with exit codes Matheus Tavares
2020-09-10 17:21           ` [PATCH v6 4/9] t/helper/test-config: diagnose missing arguments Matheus Tavares
2020-09-10 17:21           ` [PATCH v6 5/9] t/helper/test-config: unify exit labels Matheus Tavares
2020-09-10 17:21           ` [PATCH v6 6/9] config: make do_git_config_sequence receive a 'struct repository' Matheus Tavares
2020-09-10 17:21           ` [PATCH v6 7/9] config: correctly read worktree configs in submodules Matheus Tavares
2020-09-10 17:21           ` [PATCH v6 8/9] grep: honor sparse checkout patterns Matheus Tavares
2020-09-10 17:21           ` [PATCH v6 9/9] config: add setting to ignore sparsity patterns in some cmds Matheus Tavares
2021-02-09 21:33           ` [PATCH v7] grep: honor sparse-checkout on working tree searches Matheus Tavares
2021-02-09 23:23             ` Junio C Hamano
2021-02-10  6:12               ` Elijah Newren

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAHd-oW6LA7Ovnu-e9c+WapF-e+JMichWZEetxmnbjCT_H6D0AQ@mail.gmail.com \
    --to=matheus.bernardino@usp.br \
    --cc=git@vger.kernel.org \
    --cc=gitster@pobox.com \
    --cc=jonathantanmy@google.com \
    --cc=jrnieder@gmail.com \
    --cc=newren@gmail.com \
    --cc=stolee@gmail.com \
    --subject='Re: [PATCH v4 4/6] config: correctly read worktree configs in submodules' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).