Re: [PATCH v2] config: introduce an Operating System-specific `includeIf` condition

[Phillip Wood <phillip.wood123@gmail.com>]

On 22/11/2022 14:01, Ævar Arnfjörð Bjarmason wrote:
> 
> On Mon, Nov 21 2022, Johannes Schindelin via GitGitGadget wrote:
> 
>> From: Johannes Schindelin <johannes.schindelin@gmx.de>
>>
>> +`os`::
>> +	The data that follows this keyword is taken as the name of an
>> +	Operating System, e.g. `Linux` or `Windows`; If it matches the
>> +	current Operating System, the include condition is met.
>> +
>>   A few more notes on matching via `gitdir` and `gitdir/i`:
> 
> The reste of the "includeif" use glob matching and "/i" for icase. IOW
> this is how this new feature would fit in:
> 	
> 	|--------+--------+----------+----------+------------------+----|
> 	|        | gitdir | gitdir/i | onbranch | hasconfig:remote | os |
> 	|--------+--------+----------+----------+------------------+----|
> 	| icase? | N      | Y        | N        | N                | Y  |
> 	| glob?  | Y      | Y        | Y        | Y                | N  |
> 	| path?  | Y      | Y        | Y        | Y                | N  |
> 	|--------+--------+----------+----------+------------------+----|
> 
> I think at least flipping that "glob" to "Y" so you could match e.g.
> "*BSD" would be useful, and easier to explain in context, rather than
> why the rest use wildmatch() and this doesn't.

Globbing could be useful for the BSDs.

One other thing I thought of is will users know "Darwin" means MacOS?

> For matching the uname the case doesn't really matter, but for
> consistency of the interface I think making it case-sensitive or adding
> an "os/i" would make sense. I.e. let's consistently use "/i" if & when
> something's case-insensitive.

All the other items listed in your table such as branch names are case 
sensitive. The os name is not so it is of no benefit at all to the user 
to match it case sensitively. Let's consistently test case sensitive 
keys cases sensitively and case insensitive keys case insensitively.

Best Wishes

Phillip

>> +test_expect_success '[includeIf "os:..."]' '
>> +	test_config x.y 0 &&
>> +	echo "[x] y = z" >.git/xyz &&
>> +
>> +	if test_have_prereq MINGW
>> +	then
>> +		uname_s=Windows
>> +	else
>> +		uname_s="$(uname -s)"
>> +	fi &&
>> +	test_config "includeIf.os:not-$uname_s.path" xyz &&
>> +	test 0 = "$(git config x.y)" &&
>> +	test_config "includeIf.os:$uname_s.path" xyz &&
>> +	test z = "$(git config x.y)"
>> +'
> 
> As I pointed out in the v1, this still:
> 
>   * Hides segfaults in "git config", let's check the exit code.
>   * Doesn't test the "icase" semantics you're introducing. Let's do that
>     if it's intentional.