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

On 2015-01-22 23.07, Junio C Hamano wrote:

Torsten Bögershausen [off-list ref] writes:

quoted

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.

quoted

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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