From: Jonathan Tan <jonathantanmy@google.com>
To: peff@peff.net
Cc: newren@gmail.com, jonathantanmy@google.com, git@vger.kernel.org,
me@ttaylorr.com, emilyshaffer@google.com, gitster@pobox.com
Subject: Re: [PATCH v3 3/5] submodule: refrain from filtering GIT_CONFIG_COUNT
Date: Fri, 11 Jun 2021 10:02:43 -0700 [thread overview]
Message-ID: <20210611170243.486447-1-jonathantanmy@google.com> (raw)
In-Reply-To: <YMKJSuin9fS/4acr@coredump.intra.peff.net>
> > I'm super confused. It appears that
> > prepare_submodule_repo_env_no_git_dir() is filtering out
> > "GIT_CONFIG_PARAMETERS" (CONFIG_DATA_ENVIRONMENT) and
> > "GIT_CONFIG_COUNT" (CONFIG_COUNT_ENVIRONMENT), using all environment
> > variables other than these ones. But the commit message talks about
> > adding an extra environment variable, rather than filtering another
> > out. I must be mis-reading something somewhere, but I'm struggling to
> > figure it out.
>
> I think there might be a double (triple?) negative here:
>
> - we want to pass through the config parameters variable, but not
> other local repo env variables;
>
> - so we _don't_ want the config variable to appear in the "out"
> strvec, because its presence would cause it to be cleared
> from the child process environment;
>
> - so we go through the list adding everything _except_ that variable;
>
> - and we match using strcmp(), so a true value means "did not match",
> so we should add it to the list
>
> > Also, from looking at the other commit messages you reference, it
> > appears GIT_CONFIG_PARAMETERS was just one big environment variable,
> > whereas GIT_CONFIG_COUNT is closely associated with 2*N other
> > environment variables...so shouldn't your loop (and perhaps also
> > git-submodule.sh) also be checking GIT_CONFIG_KEY_\d+ and
> > GIT_CONFIG_VALUE_\d+ ?
>
> We definitely could clean out those GIT_CONFIG_KEY_* values. But the
> COUNT serves as a master parameter. Anybody who sets COUNT would then
> also set the individual key/value parameters, too (and even it only sets
> it to "5", and there is a crufty GIT_CONFIG_KEY_6 in the environment,
> that is not wrong).
>
> -Peff
As Peff describes, if an envvar is present in the list, it becomes
unset. (Perhaps confusingly, if an string of the form "ENVVAR=VALUE"
(note the "=") is present in the list, it becomes set to the given
value.) So in order to *not* filter out the envvar from the subprocess,
we need to filter out the envvar from env_array.
If you can think of a better way to document this, please let me know.
One way I thought of that might reduce confusion is for this function to
take the struct child_process directly. I don't like taking the whole
struct when we're just modifying env_array, but I think that this
becomes easier to document (just say that we're unsetting all these
envvars from the child process, and in the function body, say that to
unset a variable, we need to make it appear without a "=" in env_array).
next prev parent reply other threads:[~2021-06-11 17:03 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-01 21:34 [PATCH 0/4] First steps towards partial clone submodules Jonathan Tan
2021-06-01 21:34 ` [PATCH 1/4] promisor-remote: read partialClone config here Jonathan Tan
2021-06-04 19:56 ` Taylor Blau
2021-06-05 1:38 ` Jonathan Tan
2021-06-07 22:41 ` Emily Shaffer
2021-06-01 21:34 ` [PATCH 2/4] promisor-remote: support per-repository config Jonathan Tan
2021-06-04 20:09 ` Taylor Blau
2021-06-05 1:43 ` Jonathan Tan
2021-06-04 21:21 ` Elijah Newren
2021-06-05 1:54 ` Jonathan Tan
2021-06-08 0:48 ` Emily Shaffer
2021-06-01 21:34 ` [PATCH 3/4] run-command: move envvar-resetting function Jonathan Tan
2021-06-04 20:19 ` Taylor Blau
2021-06-05 1:57 ` Jonathan Tan
2021-06-08 0:54 ` Emily Shaffer
2021-06-01 21:34 ` [PATCH 4/4] promisor-remote: teach lazy-fetch in any repo Jonathan Tan
2021-06-04 21:25 ` Taylor Blau
2021-06-05 2:11 ` Jonathan Tan
2021-06-04 21:35 ` Elijah Newren
2021-06-05 2:16 ` Jonathan Tan
2021-06-05 3:48 ` Elijah Newren
2021-06-05 0:22 ` Elijah Newren
2021-06-05 2:16 ` Jonathan Tan
2021-06-08 1:41 ` Emily Shaffer
2021-06-09 4:52 ` Jonathan Tan
2021-06-08 0:25 ` [PATCH v2 0/4] First steps towards partial clone submodules Jonathan Tan
2021-06-08 0:25 ` [PATCH v2 1/4] promisor-remote: read partialClone config here Jonathan Tan
2021-06-08 3:18 ` Junio C Hamano
2021-06-09 4:26 ` Jonathan Tan
2021-06-09 9:30 ` Junio C Hamano
2021-06-09 17:16 ` Jonathan Tan
2021-06-08 17:28 ` Elijah Newren
2021-06-09 4:44 ` Jonathan Tan
2021-06-09 5:34 ` Elijah Newren
2021-06-10 17:25 ` Jonathan Tan
2021-06-08 0:25 ` [PATCH v2 2/4] promisor-remote: support per-repository config Jonathan Tan
2021-06-08 3:30 ` Junio C Hamano
2021-06-09 4:29 ` Jonathan Tan
2021-06-08 0:25 ` [PATCH v2 3/4] run-command: move envvar-resetting function Jonathan Tan
2021-06-08 4:14 ` Junio C Hamano
2021-06-09 4:32 ` Jonathan Tan
2021-06-09 5:28 ` Junio C Hamano
2021-06-09 18:15 ` Jonathan Tan
2021-06-08 0:25 ` [PATCH v2 4/4] promisor-remote: teach lazy-fetch in any repo Jonathan Tan
2021-06-08 4:33 ` Junio C Hamano
2021-06-09 4:39 ` Jonathan Tan
2021-06-09 5:33 ` Junio C Hamano
2021-06-09 18:20 ` Jonathan Tan
2021-06-10 1:26 ` Junio C Hamano
2021-06-08 17:42 ` Elijah Newren
2021-06-09 4:46 ` Jonathan Tan
2021-06-08 17:50 ` [PATCH v2 0/4] First steps towards partial clone submodules Elijah Newren
2021-06-08 23:42 ` Junio C Hamano
2021-06-09 0:07 ` Elijah Newren
2021-06-09 0:18 ` Junio C Hamano
2021-06-09 4:58 ` Jonathan Tan
2021-06-08 1:44 ` [PATCH " Emily Shaffer
2021-06-10 17:35 ` [PATCH v3 0/5] " Jonathan Tan
2021-06-10 17:35 ` [PATCH v3 1/5] repository: move global r_f_p_c to repo struct Jonathan Tan
2021-06-10 20:47 ` Elijah Newren
2021-06-10 17:35 ` [PATCH v3 2/5] promisor-remote: support per-repository config Jonathan Tan
2021-06-10 17:35 ` [PATCH v3 3/5] submodule: refrain from filtering GIT_CONFIG_COUNT Jonathan Tan
2021-06-10 21:13 ` Elijah Newren
2021-06-10 21:51 ` Jeff King
2021-06-11 17:02 ` Jonathan Tan [this message]
2021-06-10 17:35 ` [PATCH v3 4/5] run-command: refactor subprocess env preparation Jonathan Tan
2021-06-10 21:21 ` Elijah Newren
2021-06-10 17:35 ` [PATCH v3 5/5] promisor-remote: teach lazy-fetch in any repo Jonathan Tan
2021-06-10 21:29 ` [PATCH v3 0/5] First steps towards partial clone submodules Elijah Newren
2021-06-15 21:22 ` Elijah Newren
2021-06-17 17:13 ` [PATCH v4 " Jonathan Tan
2021-06-17 17:13 ` [PATCH v4 1/5] repository: move global r_f_p_c to repo struct Jonathan Tan
2021-06-17 17:13 ` [PATCH v4 2/5] promisor-remote: support per-repository config Jonathan Tan
2021-06-17 17:13 ` [PATCH v4 3/5] submodule: refrain from filtering GIT_CONFIG_COUNT Jonathan Tan
2021-06-17 17:13 ` [PATCH v4 4/5] run-command: refactor subprocess env preparation Jonathan Tan
2021-06-17 17:13 ` [PATCH v4 5/5] promisor-remote: teach lazy-fetch in any repo Jonathan Tan
2021-06-19 20:01 ` [PATCH v4 0/5] First steps towards partial clone submodules Elijah Newren
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