Re: [PATCH 1/3] describe: debug is incompatible with contains

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Michael J Gruber <git@xxxxxxxxxxxxxxxxxxxx> writes:

> `git describe --contains` calls into `git name-rev` which does not have
> any searching to do and thus does not display any debug information.
>
> Say so in the documentation and catch the incompatible arguments.

I am not sure if this is worth it.  Those who are really doing the
debugging would be staring at the code while running it anyway, so
it is not like this new error condition would help anybody from
wasting time scratching her head before viewing the source and
realize that the underlying name-rev does not honor the option.

If "--debug" is truly valuable, "name-rev" can gain "--debug" later
and then we can pass it down if we want.

Also, it is not like "--debug" is incompatible.  It is just the
"--contains" codepath is overly silent and does not give any useful
information when run in the debug mode.  "incompatible" is more like
"would not work correctly when both are given", which is not the
case here.

>
> Signed-off-by: Michael J Gruber <git@xxxxxxxxxxxxxxxxxxxx>
> ---
>  Documentation/git-describe.txt | 2 +-
>  builtin/describe.c             | 2 ++
>  2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/git-describe.txt b/Documentation/git-describe.txt
> index 8755f3af7b..0f9adb6e9a 100644
> --- a/Documentation/git-describe.txt
> +++ b/Documentation/git-describe.txt
> @@ -69,7 +69,7 @@ OPTIONS
>  --debug::
>  	Verbosely display information about the searching strategy
>  	being employed to standard error.  The tag name will still
> -	be printed to standard out.
> +	be printed to standard out. This is incompatible with --contains.
>  
>  --long::
>  	Always output the long format (the tag, the number of commits
> diff --git a/builtin/describe.c b/builtin/describe.c
> index 76c18059bf..01a6d159a0 100644
> --- a/builtin/describe.c
> +++ b/builtin/describe.c
> @@ -462,6 +462,8 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
>  
>  	if (longformat && abbrev == 0)
>  		die(_("--long is incompatible with --abbrev=0"));
> +	if (contains && debug)
> +		die(_("--debug is incompatible with --contains"));
>  
>  	if (contains) {
>  		struct string_list_item *item;



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