Subject: Re: Re: [PATCH] t/lib-httpd: switch SANITY check for NOT_ROOT

From: Torsten Bögershausen <[email-masked]>
Date: Fri, 23 Jan 2015 07:00:53 +0100

On 2015-01-22 23.07, Junio C Hamano wrote:
> Torsten Bögershausen <[email-masked]> writes:
> 
>> If I run that sequence manually:
>> chmod 755 .
>> touch x
>> chmod a-w .
>> rm x
>> touch y
>>
>> x is gone, (but shoudn't according to POSIX)
>> y is not created, "access denied"
> 
> Good (or is that Sad?).
It feels that this is by design:
In old days under MS/DOS the only way to hinder people
from deleting a file was to make it "read only" with help
of the ATTRIB command.
https://en.wikipedia.org/wiki/ATTRIB

Later NTFS introduced the (ACL like) secutity information,
and (unless I am completely wrong) the "delete file" is part
of the "modify" permission, not write.
> 
>> diff --git a/t/test-lib.sh b/t/test-lib.sh
>> --- a/t/test-lib.sh
>> +++ b/t/test-lib.sh
>> @@ -1039,7 +1039,17 @@ test_lazy_prereq NOT_ROOT '
>>  # When the tests are run as root, permission tests will report that
>>  # things are writable when they shouldn't be.
>>  test_lazy_prereq SANITY '
>> -       test_have_prereq POSIXPERM,NOT_ROOT
>> +       mkdir ds &&
>> +       touch ds/x &&
>> +       chmod -w ds &&
>> +       if rm ds/x
>> +       then
>> +               chmod +w ds
>> +               false
>> +       else
>> +               chmod +w ds
>> +               true
>> +       fi
>>  '
> 
> It looks like a better approach overall.
> 
> Because we cannot know where $(pwd) is when lazy prereq is evaluated
> (it typically is at the root of the trash hierarchy, but not always)
> and we would not want to add, leave or remove random files in the
> working tree that are not expected by the tests proper (e.g. a test
> that counts untracked paths are not expecting ds/ to be there), your
> actual "fix" may need to be a bit more careful, though.
> 
> Thanks.
> 
So true, what is a better place or way to run the test ?
Can we use /tmp  (Which may be a different file system)?
Or can we use $HOME/$$ds (Which is an artificial HOME)

We already "pollute" the $PWD here
test_lazy_prereq CASE_INSENSITIVE_FS '
  	echo good >CamelCase &&
	echo bad >camelcase &&
	test "$(cat CamelCase)" != good
'
and here:
test_lazy_prereq UTF8_NFD_TO_NFC '
....

Would 
mkdir $HOME/ds
be a better approach then ?

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