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From: Stefan Beller <sbeller@google.com>
To: Brandon Williams <bmwill@google.com>
Cc: "Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>, git <git@vger.kernel.org>
Subject: Re: [PATCH] run-command.c: print env vars when GIT_TRACE is set
Date: Wed, 10 Jan 2018 11:14:32 -0800	[thread overview]
Message-ID: <CAGZ79ka0mhPy776fRYtvnaqd5P1dwvuaeONozEWpaJVZxSneiA@mail.gmail.com> (raw)
In-Reply-To: <20180110180945.GA53941@google.com>

On Wed, Jan 10, 2018 at 10:09 AM, Brandon Williams <bmwill@google.com> wrote:
> On 01/10, Nguyễn Thái Ngọc Duy wrote:
>> Occasionally submodule code could execute new commands with GIT_DIR set
>> to some submodule. GIT_TRACE prints just the command line which makes it
>> hard to tell that it's not really executed on this repository.

Speaking of GIT_DIR, we may also want to print the dir that the command is
executed in as the GIT_DIR for submodules usually is only ".git" assuming the
run-command struct set the .dir to the submodules worktree. I think I had a
patch for printing the cwd of a process on the list once upon a time, but
I am unable to find it again. Maybe we'd want to include the cwd of a spawned
process if it differs from the current process?

>>
>> Print env variables in this case. Note that the code deliberately ignore
>> variables unsetting because there are so many of them (to keep git
>> environment clean for the next process) and really hard to read.
>>
>> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
>> ---
>>  A minor thing that I ignored in this patch is quoting the environment
>>  variables. For me it's meh. Perhaps I should just dumb the env
>>  without quoting at all.
>
> A patch like this would have been very helpful to me on some previous
> occasions, so thanks for writing it up.

The patch I mentioned above (very similar though less powerful than this one)
was carried by locally for some time, so I definitely see value in this patch.
Thanks for writing it!

>
>>
>>  run-command.c |  3 ++-
>>  trace.c       | 38 +++++++++++++++++++++++++++++++++++---
>>  trace.h       | 18 +++++++++++++++---
>>  3 files changed, 52 insertions(+), 7 deletions(-)
>>
>> diff --git a/run-command.c b/run-command.c
>> index 31fc5ea86e..235367087d 100644
>> --- a/run-command.c
>> +++ b/run-command.c
>> @@ -624,7 +624,8 @@ int start_command(struct child_process *cmd)
>>               cmd->err = fderr[0];
>>       }
>>
>> -     trace_argv_printf(cmd->argv, "trace: run_command:");
>> +     trace_env_argv_printf(cmd->env, cmd->argv, "trace: run_command:");
>> +
>>       fflush(NULL);
>>
>>  #ifndef GIT_WINDOWS_NATIVE
>> diff --git a/trace.c b/trace.c
>> index b7530b51a9..d8967b66e8 100644
>> --- a/trace.c
>> +++ b/trace.c
>> @@ -146,7 +146,26 @@ static void trace_vprintf_fl(const char *file, int line, struct trace_key *key,
>>       print_trace_line(key, &buf);
>>  }
>>
>> +static void concatenate_env(struct strbuf *dst, const char *const *env)
>> +{
>> +     int i;
>> +
>> +     /* Copy into destination buffer. */
>> +     strbuf_grow(dst, 255);
>> +     for (i = 0; env[i]; ++i) {
>> +             /*
>> +              * the main interesting is setting new vars
>> +              * e.g. GIT_DIR, ignore the unsetting to reduce noise.
>> +              */
>
> I think you're missing a word, maybe:
>   'The main interesting part is setting new vars'
>
>> +             if (!strchr(env[i], '='))
>> +                     continue;
>> +             strbuf_addch(dst, ' ');
>> +             sq_quote_buf(dst, env[i]);
>> +     }
>
> At first when i read this I was under the impression that the whole
> environment was going to be printed out...but i now realize that this
> tracing  will only print out the delta's or the additions to the
> environment that the child will see.  Maybe this should be called out
> more clearly in the commit message?

It only adds newly set variables, I wonder why deletions are noisy?
I could not find an example of a removal of environment variables
specific to submodules that would be noisy.

Stefan

  reply	other threads:[~2018-01-10 19:14 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-10 10:48 [PATCH] run-command.c: print env vars when GIT_TRACE is set Nguyễn Thái Ngọc Duy
2018-01-10 18:09 ` Brandon Williams
2018-01-10 19:14   ` Stefan Beller [this message]
2018-01-10 19:26     ` Brandon Williams
2018-01-10 19:35       ` Stefan Beller
2018-01-11  9:47 ` [PATCH v2] " Nguyễn Thái Ngọc Duy
2018-01-11 11:25   ` Duy Nguyen
2018-01-11 17:53   ` Brandon Williams
2018-01-11 18:20     ` Stefan Beller
2018-01-11 19:27   ` Junio C Hamano
2018-01-12  9:23     ` Duy Nguyen
2018-01-12  9:56   ` [PATCH v3 0/4] " Nguyễn Thái Ngọc Duy
2018-01-12  9:56     ` [PATCH v3 1/4] trace.c: introduce trace_run_command() Nguyễn Thái Ngọc Duy
2018-01-12 13:05       ` Jeff King
2018-01-12 13:11         ` Jeff King
2018-01-12  9:56     ` [PATCH v3 2/4] trace.c: print program 'git' when child_process.git_cmd is set Nguyễn Thái Ngọc Duy
2018-01-12 13:05       ` Jeff King
2018-01-12  9:56     ` [PATCH v3 3/4] trace.c: print env vars in trace_run_command() Nguyễn Thái Ngọc Duy
2018-01-12 13:13       ` Jeff King
2018-01-12  9:56     ` [PATCH v3 4/4] trace.c: be smart about what env to print " Nguyễn Thái Ngọc Duy
2018-01-12 13:33       ` Jeff King
2018-01-12 18:24         ` Junio C Hamano
2018-01-12 18:45           ` Jeff King
2018-01-12 19:19             ` Junio C Hamano
2018-01-12 19:23               ` Jeff King
2018-01-12 20:28                 ` Brandon Williams
2018-01-12 22:54         ` Junio C Hamano
2018-01-13  4:54           ` Duy Nguyen
2018-01-13  6:47             ` Duy Nguyen
2018-01-12 13:36     ` [PATCH v3 0/4] run-command.c: print env vars when GIT_TRACE is set Jeff King
2018-01-12 13:38       ` [PATCH 5/4] sq_quote_argv: drop maxlen parameter Jeff King
2018-01-12 23:20         ` Junio C Hamano
2018-01-12 13:39       ` [PATCH 6/4] trace: avoid unnecessary quoting Jeff King
2018-01-12 18:06       ` [PATCH v3 0/4] run-command.c: print env vars when GIT_TRACE is set Stefan Beller
2018-01-12 17:19     ` Stefan Beller
2018-01-13  6:54       ` Duy Nguyen
2018-01-13  6:49     ` [PATCH v4 0/7] Trace env variables in run_command() Nguyễn Thái Ngọc Duy
2018-01-13  6:49       ` [PATCH v4 1/7] sq_quote_argv: drop maxlen parameter Nguyễn Thái Ngọc Duy
2018-01-13  6:49       ` [PATCH v4 2/7] trace: avoid unnecessary quoting Nguyễn Thái Ngọc Duy
2018-01-13  6:49       ` [PATCH v4 3/7] trace.c: move strbuf_release() out of print_trace_line() Nguyễn Thái Ngọc Duy
2018-01-13  7:14         ` Jeff King
2018-01-13  6:49       ` [PATCH v4 4/7] trace.c: introduce trace_run_command() Nguyễn Thái Ngọc Duy
2018-01-13  6:49       ` [PATCH v4 5/7] trace.c: print program 'git' when child_process.git_cmd is set Nguyễn Thái Ngọc Duy
2018-01-13  6:49       ` [PATCH v4 6/7] trace.c: print env vars in trace_run_command() Nguyễn Thái Ngọc Duy
2018-01-13  7:25         ` Jeff King
2018-01-16 22:13         ` Junio C Hamano
2018-01-16 22:20           ` Stefan Beller
2018-01-17  1:32             ` Junio C Hamano
2018-01-13  6:49       ` [PATCH v4 7/7] trace.c: print new cwd " Nguyễn Thái Ngọc Duy
2018-01-13  7:26       ` [PATCH v4 0/7] Trace env variables in run_command() Jeff King
2018-01-15 10:59       ` [PATCH v5 " Nguyễn Thái Ngọc Duy
2018-01-15 10:59         ` [PATCH v5 1/7] sq_quote_argv: drop maxlen parameter Nguyễn Thái Ngọc Duy
2018-01-15 10:59         ` [PATCH v5 2/7] trace: avoid unnecessary quoting Nguyễn Thái Ngọc Duy
2018-01-15 10:59         ` [PATCH v5 3/7] trace.c: move strbuf_release() out of print_trace_line() Nguyễn Thái Ngọc Duy
2018-01-16 18:24           ` Brandon Williams
2018-01-15 10:59         ` [PATCH v5 4/7] trace.c: introduce trace_run_command() Nguyễn Thái Ngọc Duy
2018-01-17 22:21           ` Jeff King
2018-01-17 22:41             ` Junio C Hamano
2018-01-15 10:59         ` [PATCH v5 5/7] trace.c: print program 'git' when child_process.git_cmd is set Nguyễn Thái Ngọc Duy
2018-01-15 10:59         ` [PATCH v5 6/7] trace.c: print env vars in trace_run_command() Nguyễn Thái Ngọc Duy
2018-01-16 18:32           ` Brandon Williams
2018-01-15 10:59         ` [PATCH v5 7/7] trace.c: print new cwd " Nguyễn Thái Ngọc Duy
2018-01-18  9:45         ` [PATCH v6 0/7] Trace env variables in run_command() Nguyễn Thái Ngọc Duy
2018-01-18  9:45           ` [PATCH v6 1/7] sq_quote_argv: drop maxlen parameter Nguyễn Thái Ngọc Duy
2018-01-18  9:45           ` [PATCH v6 2/7] trace: avoid unnecessary quoting Nguyễn Thái Ngọc Duy
2018-01-18  9:45           ` [PATCH v6 3/7] trace.c: move strbuf_release() out of print_trace_line() Nguyễn Thái Ngọc Duy
2018-01-18  9:45           ` [PATCH v6 4/7] run-command.c: introduce trace_run_command() Nguyễn Thái Ngọc Duy
2018-01-18  9:45           ` [PATCH v6 5/7] run-command.c: print program 'git' when tracing git_cmd mode Nguyễn Thái Ngọc Duy
2018-01-18  9:45           ` [PATCH v6 6/7] run-command.c: print env vars in trace_run_command() Nguyễn Thái Ngọc Duy
2018-01-18  9:45           ` [PATCH v6 7/7] run-command.c: print new cwd " Nguyễn Thái Ngọc Duy
2018-01-19 21:39           ` [PATCH v6 0/7] Trace env variables in run_command() Jeff King
2018-01-11 10:07 ` [PATCH] run-command.c: print env vars when GIT_TRACE is set Jeff King
2018-01-11 11:13   ` Duy Nguyen
2018-01-11 18:21   ` Johannes Sixt

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