From: Glen Choo <chooglen@google.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>, git@vger.kernel.org
Cc: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: Re: [RFC PATCH 1/8] submodule--helper: don't use global --super-prefix in "absorbgitdirs"
Date: Thu, 10 Nov 2022 16:12:11 -0800 [thread overview]
Message-ID: <kl6ledua2vtw.fsf@chooglen-macbookpro.roam.corp.google.com> (raw)
In-Reply-To: <RFC-patch-1.8-ad0356b596f-20221109T192315Z-avarab@gmail.com>
Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:
> But in the case of "absorbgitdirs" it only needed "--super-prefix" to
> invoke itself recursively, and we'd never have another "in-between"
> process in the chain. So we didn't need the bigger hammer of "git
> --super-prefix", and the "setenv(GIT_SUPER_PREFIX_ENVIRONMENT, ...)"
> that it entails.
I also thought this was the case, but in the proces of reviewing this, I
I'm not sure any more. More below..
> Eventually (as with all other "--super-prefix" users) we'll want to
> clean this code up so that this all happens in-process. I.e. needing
> any variant of "--super-prefix" is itself a hack around our various
> global state, and implicit reliance on "the_repository". This stepping
> stone makes such an eventual change easier, as we'll need to deal with
> less global state at that point.
Yes, I 100% agree. I am not optimistic that we can clean all of these up
any time soon, but I can buy the argument that we will have to remove
the extra global state at some point, so we should just bite the bullet
now.
> diff --git a/parse-options.h b/parse-options.h
> index b6ef86e0d15..50d852f2991 100644
> --- a/parse-options.h
> +++ b/parse-options.h
> @@ -369,6 +369,10 @@ int parse_opt_tracking_mode(const struct option *, const char *, int);
> { OPTION_CALLBACK, 0, "abbrev", (var), N_("n"), \
> N_("use <n> digits to display object names"), \
> PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
> +#define OPT__SUPER_PREFIX(var) \
> + OPT_STRING_F(0, "super-prefix", (var), N_("prefix"), \
> + N_("prefixed path to initial superproject"), PARSE_OPT_HIDDEN)
> +
> #define OPT__COLOR(var, h) \
> OPT_COLOR_FLAG(0, "color", (var), (h))
> #define OPT_COLUMN(s, l, v, h) \
> diff --git a/submodule.c b/submodule.c
> index c47358097fd..d9fd0af81b6 100644
> --- a/submodule.c
> +++ b/submodule.c
> @@ -2268,7 +2268,8 @@ int validate_submodule_git_dir(char *git_dir, const char *submodule_name)
> * Embeds a single submodules git directory into the superprojects git dir,
> * non recursively.
> */
> -static void relocate_single_git_dir_into_superproject(const char *path)
> +static void relocate_single_git_dir_into_superproject(const char *path,
> + const char *super_prefix)
> {
> char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
> struct strbuf new_gitdir = STRBUF_INIT;
> @@ -2302,7 +2303,7 @@ static void relocate_single_git_dir_into_superproject(const char *path)
> real_old_git_dir[off] == real_new_git_dir[off])
> off++;
> fprintf(stderr, _("Migrating git directory of '%s%s' from '%s' to '%s'\n"),
> - get_super_prefix_or_empty(), path,
> + (super_prefix ? super_prefix : ""), path,
> real_old_git_dir + off, real_new_git_dir + off);
>
> relocate_gitdir(path, real_old_git_dir, real_new_git_dir);
When this gets cleaned up post-RFC, I think we should have
OPT__SUPER_PREFIX handle this "default to empty" behavior for us.
> diff --git a/submodule.h b/submodule.h
> index b52a4ff1e73..e5ee13fb06a 100644
> --- a/submodule.h
> +++ b/submodule.h
> @@ -164,7 +164,12 @@ void submodule_unset_core_worktree(const struct submodule *sub);
> */
> void prepare_submodule_repo_env(struct strvec *env);
>
> -void absorb_git_dir_into_superproject(const char *path);
> +void absorb_git_dir_into_superproject_sp(const char *path,
> + const char *super_prefix);
> +static inline void absorb_git_dir_into_superproject(const char *path)
> +{
> + absorb_git_dir_into_superproject_sp(path, NULL);
> +}
Since absorb_git_dir_into_superproject() is called by
submodule_move_head() (the function that handles submodule changes in
unpack_trees()), it can be called from "git read-tree".
So we really do end up mixing the different values of --super-prefix;
invoking "absorbgitdirs" directly would print the relative path from
cwd, but invoking it indirectly via "read-tree" would print the path
from the root of the superproject tree. I guess that result makes sense,
since "read-tree" and friends print paths from the root of the tree, but
it feels a bit odd.
I'll propose a test for this after I finish reading through the series.
To avoid masking this behavior, I think we'll have to avoid going down
the *_sp() path and just plumb super_prefix everywhere.
>
> /*
> * Return the absolute path of the working tree of the superproject, which this
> --
> 2.38.0.1467.g709fbdff1a9
next prev parent reply other threads:[~2022-11-11 0:12 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-09 0:47 [RFC PATCH 0/4] git: remove --super-prefix Glen Choo
2022-11-09 0:47 ` [RFC PATCH 1/4] submodule--helper: teach --toplevel-cwd-prefix Glen Choo
2022-11-09 2:37 ` Ævar Arnfjörð Bjarmason
2022-11-09 0:47 ` [RFC PATCH 2/4] fetch: refactor --submodule-prefix Glen Choo
2022-11-09 3:06 ` Ævar Arnfjörð Bjarmason
2022-11-09 0:47 ` [RFC PATCH 3/4] read-tree: teach --submodule-prefix Glen Choo
2022-11-09 3:13 ` Ævar Arnfjörð Bjarmason
2022-11-09 0:47 ` [RFC PATCH 4/4] git: remove --super-prefix Glen Choo
2022-11-09 19:34 ` [RFC PATCH 0/8] Get rid of "git --super-prefix" Ævar Arnfjörð Bjarmason
2022-11-09 19:34 ` [RFC PATCH 1/8] submodule--helper: don't use global --super-prefix in "absorbgitdirs" Ævar Arnfjörð Bjarmason
2022-11-11 0:12 ` Glen Choo [this message]
2022-11-09 19:34 ` [RFC PATCH 2/8] submodule--helper: "deinit" has never used "--super-prefix" Ævar Arnfjörð Bjarmason
2022-11-09 19:34 ` [RFC PATCH 3/8] submodule--helper: convert "foreach" to its own "--super-prefix" Ævar Arnfjörð Bjarmason
2022-11-09 19:34 ` [RFC PATCH 4/8] submodule--helper: convert "sync" " Ævar Arnfjörð Bjarmason
2022-11-09 19:34 ` [RFC PATCH 5/8] submodule--helper: convert "status" " Ævar Arnfjörð Bjarmason
2022-11-09 19:34 ` [RFC PATCH 6/8] submodule--helper: convert "{update,clone}" to their " Ævar Arnfjörð Bjarmason
2022-11-09 19:34 ` [RFC PATCH 7/8] submodule tests: test "git branch -t" output and stderr Ævar Arnfjörð Bjarmason
2022-11-09 19:34 ` [RFC PATCH 8/8] read-tree: add "--super-prefix" option, eliminate global Ævar Arnfjörð Bjarmason
2022-11-11 0:40 ` Glen Choo
2022-11-09 21:21 ` [RFC PATCH 0/8] Get rid of "git --super-prefix" Taylor Blau
2022-11-09 21:47 ` Ævar Arnfjörð Bjarmason
2022-11-09 22:27 ` Taylor Blau
2022-11-09 22:54 ` Ævar Arnfjörð Bjarmason
2022-11-10 0:45 ` Glen Choo
2022-11-10 10:51 ` Ævar Arnfjörð Bjarmason
2022-11-11 1:07 ` Glen Choo
2022-11-11 18:29 ` Glen Choo
2022-11-11 21:17 ` Ævar Arnfjörð Bjarmason
2022-11-11 21:51 ` Taylor Blau
2022-11-12 1:10 ` Glen Choo
2022-11-14 10:09 ` Ævar Arnfjörð Bjarmason
2022-11-14 23:33 ` Glen Choo
2022-11-15 1:37 ` Ævar Arnfjörð Bjarmason
2022-11-14 10:08 ` [PATCH v2 00/10] " Ævar Arnfjörð Bjarmason
2022-11-14 10:08 ` [PATCH v2 01/10] read-tree + fetch tests: test failing "--super-prefix" interaction Ævar Arnfjörð Bjarmason
2022-11-14 19:00 ` Glen Choo
2022-11-14 19:14 ` Ævar Arnfjörð Bjarmason
2022-11-14 19:49 ` Glen Choo
2022-11-14 10:08 ` [PATCH v2 02/10] submodule--helper: don't use global --super-prefix in "absorbgitdirs" Ævar Arnfjörð Bjarmason
2022-11-14 21:22 ` Glen Choo
2022-11-17 18:10 ` Ævar Arnfjörð Bjarmason
2022-11-14 10:08 ` [PATCH v2 03/10] submodule--helper: "deinit" has never used "--super-prefix" Ævar Arnfjörð Bjarmason
2022-11-14 10:08 ` [PATCH v2 04/10] submodule--helper: convert "foreach" to its own "--super-prefix" Ævar Arnfjörð Bjarmason
2022-11-14 21:56 ` Glen Choo
2022-11-17 18:14 ` Ævar Arnfjörð Bjarmason
2022-11-14 10:08 ` [PATCH v2 05/10] submodule--helper: convert "sync" " Ævar Arnfjörð Bjarmason
2022-11-14 10:08 ` [PATCH v2 06/10] submodule--helper: convert "status" " Ævar Arnfjörð Bjarmason
2022-11-14 10:08 ` [PATCH v2 07/10] submodule--helper: convert "{update,clone}" to their " Ævar Arnfjörð Bjarmason
2022-11-14 22:04 ` Glen Choo
2022-11-14 10:08 ` [PATCH v2 08/10] submodule tests: test "git branch -t" output and stderr Ævar Arnfjörð Bjarmason
2022-11-14 22:20 ` Glen Choo
2022-11-14 10:08 ` [PATCH v2 09/10] read-tree: add "--super-prefix" option, eliminate global Ævar Arnfjörð Bjarmason
2022-11-14 22:28 ` Glen Choo
2022-11-14 10:08 ` [PATCH v2 10/10] fetch: rename "--submodule-prefix" to "--super-prefix" Ævar Arnfjörð Bjarmason
2022-11-14 22:31 ` Glen Choo
2022-11-14 21:59 ` [PATCH v2 00/10] Get rid of "git --super-prefix" Taylor Blau
2022-11-14 23:20 ` Glen Choo
2022-11-14 23:39 ` Glen Choo
2022-11-15 1:27 ` Ævar Arnfjörð Bjarmason
2022-11-16 21:07 ` Glen Choo
2022-11-17 18:07 ` Ævar Arnfjörð Bjarmason
2022-11-21 19:16 ` Glen Choo
2022-11-19 12:41 ` [PATCH v3 0/9] " Ævar Arnfjörð Bjarmason
2022-11-19 12:41 ` [PATCH v3 1/9] read-tree + fetch tests: test failing "--super-prefix" interaction Ævar Arnfjörð Bjarmason
2022-11-19 12:41 ` [PATCH v3 2/9] submodule.c & submodule--helper: pass along "super_prefix" param Ævar Arnfjörð Bjarmason
2022-11-19 12:41 ` [PATCH v3 3/9] submodule--helper: don't use global --super-prefix in "absorbgitdirs" Ævar Arnfjörð Bjarmason
2022-11-22 19:53 ` Glen Choo
2022-11-19 12:41 ` [PATCH v3 4/9] submodule--helper: convert "foreach" to its own "--super-prefix" Ævar Arnfjörð Bjarmason
2022-11-19 12:41 ` [PATCH v3 5/9] submodule--helper: convert "sync" " Ævar Arnfjörð Bjarmason
2022-11-19 12:41 ` [PATCH v3 6/9] submodule--helper: convert "status" " Ævar Arnfjörð Bjarmason
2022-11-19 12:41 ` [PATCH v3 7/9] submodule--helper: convert "{update,clone}" to their " Ævar Arnfjörð Bjarmason
2022-11-19 12:41 ` [PATCH v3 8/9] read-tree: add "--super-prefix" option, eliminate global Ævar Arnfjörð Bjarmason
2022-11-22 19:57 ` Glen Choo
2022-11-19 12:41 ` [PATCH v3 9/9] fetch: rename "--submodule-prefix" to "--super-prefix" Ævar Arnfjörð Bjarmason
2022-11-22 22:29 ` [PATCH v3 0/9] Get rid of "git --super-prefix" Glen Choo
2022-12-15 9:32 ` [PATCH v4 " Ævar Arnfjörð Bjarmason
2022-12-15 9:32 ` [PATCH v4 1/9] submodule absorbgitdirs tests: add missing "Migrating git..." tests Ævar Arnfjörð Bjarmason
2022-12-15 20:54 ` Glen Choo
2022-12-20 10:32 ` Ævar Arnfjörð Bjarmason
2022-12-15 9:32 ` [PATCH v4 2/9] read-tree + fetch tests: test failing "--super-prefix" interaction Ævar Arnfjörð Bjarmason
2022-12-15 9:32 ` [PATCH v4 3/9] submodule.c & submodule--helper: pass along "super_prefix" param Ævar Arnfjörð Bjarmason
2022-12-15 9:32 ` [PATCH v4 4/9] submodule--helper: don't use global --super-prefix in "absorbgitdirs" Ævar Arnfjörð Bjarmason
2022-12-15 21:05 ` Glen Choo
2022-12-15 9:32 ` [PATCH v4 5/9] submodule--helper: convert "foreach" to its own "--super-prefix" Ævar Arnfjörð Bjarmason
2022-12-15 9:32 ` [PATCH v4 6/9] submodule--helper: convert "sync" " Ævar Arnfjörð Bjarmason
2022-12-15 9:32 ` [PATCH v4 7/9] submodule--helper: convert "status" " Ævar Arnfjörð Bjarmason
2022-12-15 9:32 ` [PATCH v4 8/9] submodule--helper: convert "{update,clone}" to their " Ævar Arnfjörð Bjarmason
2022-12-15 9:32 ` [PATCH v4 9/9] read-tree: add "--super-prefix" option, eliminate global Ævar Arnfjörð Bjarmason
2022-12-15 21:19 ` [PATCH v4 0/9] Get rid of "git --super-prefix" Glen Choo
2022-12-15 22:19 ` Junio C Hamano
2022-12-15 22:12 ` Junio C Hamano
2022-12-20 12:39 ` [PATCH v5 " Ævar Arnfjörð Bjarmason
2022-12-20 12:39 ` [PATCH v5 1/9] submodule absorbgitdirs tests: add missing "Migrating git..." tests Ævar Arnfjörð Bjarmason
2022-12-20 12:39 ` [PATCH v5 2/9] read-tree + fetch tests: test failing "--super-prefix" interaction Ævar Arnfjörð Bjarmason
2022-12-20 12:39 ` [PATCH v5 3/9] submodule.c & submodule--helper: pass along "super_prefix" param Ævar Arnfjörð Bjarmason
2022-12-20 12:39 ` [PATCH v5 4/9] submodule--helper: don't use global --super-prefix in "absorbgitdirs" Ævar Arnfjörð Bjarmason
2022-12-20 12:39 ` [PATCH v5 5/9] submodule--helper: convert "foreach" to its own "--super-prefix" Ævar Arnfjörð Bjarmason
2022-12-20 12:39 ` [PATCH v5 6/9] submodule--helper: convert "sync" " Ævar Arnfjörð Bjarmason
2022-12-20 12:39 ` [PATCH v5 7/9] submodule--helper: convert "status" " Ævar Arnfjörð Bjarmason
2022-12-20 12:39 ` [PATCH v5 8/9] submodule--helper: convert "{update,clone}" to their " Ævar Arnfjörð Bjarmason
2022-12-20 12:39 ` [PATCH v5 9/9] read-tree: add "--super-prefix" option, eliminate global Ævar Arnfjörð Bjarmason
2022-11-09 21:16 ` [RFC PATCH 0/4] git: remove --super-prefix Taylor Blau
2022-11-09 23:55 ` Glen Choo
2022-11-10 2:14 ` Taylor Blau
2022-11-10 23:49 ` Glen Choo
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