On Thu, Jun 2, 2016 at 11:42 AM, Ramsay Jones
<[email protected]> wrote:
>
>
> On 02/06/16 17:10, Junio C Hamano wrote:
>> Ramsay Jones <[email protected]> writes:
>>
>>> So, at risk of annoying you, let me continue in my ignorance a little
>>> longer and ask: even if you have to protect all of this 'magic' from
>>> the shell with '/" quoting, could you not use (nested) quotes to
>>> protect the <value> part of an <attr>? For example:
>>>
>>> git ls-files ':(attr:whitespace="indent,trail,space",icase)'
>>
>> That would be workable, I would think. Before attr:VAR=VAL
>> extention, supported pathspec <magic> were only single lowercase-ascii
>> alphabet tokens, so nobody would have used " as a part of magic. So
>> quting with double-quote pair would work.
>
> I was thinking about both ' and ", so that you could do:
>
> $ ./args ':(attr:whitespace="indent,trail,space",icase)'
> 1::(attr:whitespace="indent,trail,space",icase)
>
> $ ./args ":(attr:whitespace='indent,trail,space',icase)"
> 1::(attr:whitespace='indent,trail,space',icase)
>
> $ p=':(attr:whitespace="indent,trail,space",icase)'
> $ ./args "$p"
> 1::(attr:whitespace="indent,trail,space",icase)
>
> $ p=":(attr:whitespace=\"indent,trail,space\",icase)"
> $ ./args "$p"
> 1::(attr:whitespace="indent,trail,space",icase)
>
> but limiting it to " would probably be OK too.
>
>> You'd need to come up with a way to quote a double quote that
>> happens to be a part of VAL somehow, though.
>
> Yes I was assuming \ quoting as well - I just want to reduce the
> need for such quoting (especially on windows).
>
>> I think attribute
>> value is limited to a string with non-whitespace letters; even
>> though the built-in attributes that have defined meaning to the Git
>> itself may not use values with letters beyond [-a-zA-Z0-9,], end
>> users and projects can add arbitrary values within the allowed
>> syntax, so it is not unconceivable that some project may have a
>> custom attribute that lists forbidden characters in a path with
>>
>> === .gitattributes ===
>> *.txt forbidden=`"
We restrict the 'forbidden' to follow [-a-zA-Z0-9,], so we could enforce
it for the values, too.
>
> $ ./args ":(attr:*.txt forbidden=\'\\\",icase)"
> 1::(attr:*.txt forbidden=\'\",icase)
You should lose the *.txt in there, but put it at the back
> $ ./args ":(attr:forbidden=\'\\\",icase)*.txt"
>
> $ ./args ':(attr:*.txt forbidden=\'\''\",icase)'
> 1::(attr:*.txt forbidden=\'\",icase)
I see, so quoting by " or ' is preferred. What if the user
wants to do a
forbidden=',"
so we have to escape those in there, such as
./args ':(attr:"forbidden=\',\"")'
We need to escape both ' and ", one for the outer
shell and one for Git parsing.
Does that seem ok?
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