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+ Thu, 13 Jun 2013 22:47:33 +0300 (EEST)\r
+From: Tomi Ollila <tomi.ollila@iki.fi>\r
+To: Austin Clements <amdragon@MIT.EDU>\r
+Subject: Re: [PATCH 1/1] test/basic: replaced find -perm +111 with portable\r
+ alternative\r
+In-Reply-To: <20130610155940.GE22196@mit.edu>\r
+References: <1370641049-17390-1-git-send-email-tomi.ollila@iki.fi>\r
+ <20130610155940.GE22196@mit.edu>\r
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+Date: Thu, 13 Jun 2013 22:47:33 +0300\r
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+\r
+On Mon, Jun 10 2013, Austin Clements <amdragon@MIT.EDU> wrote:\r
+\r
+> LGTM. Though, I wonder, why not *just* -perm -100? That isn't quite\r
+> a correct test of whether the user can execute it: e.g., if the file\r
+> is owned by some other user and a group the current user isn't in,\r
+> then -perm -1 is the correct test, though unless the file has some\r
+> unusual permissions, -perm -100 is likely to pass anyway. But the\r
+> test you have (and the test that was there before) isn't quite correct\r
+> either: if the file is owned by the current user and has some crazy\r
+> permission like 0611, the user won't be able to execute it, even\r
+> though someone else could.\r
+\r
+While giving considerable amount of thought for such an insignificant\r
+issue I came to realize this:\r
+\r
+The purpose of the '-perm ...' part in that expression is not to check\r
+whether the file is executable by the user but just to reduce the set\r
+of files the whole expression returns without need to "blacklist" more\r
+files that are already blacklisted with '! -name ...' subexpressions\r
+("Makefile", ".gitignore" and so on).\r
+\r
+With +111, /ppp and their portable alternative\r
+( -perm -100 -or -perm -10 -or -perm 1 ) the implicit reduction this\r
+part does is smaller than with -100.\r
+\r
+The returned list is then compared with ${TESTS} and if there is no\r
+exact match then this particular test fails.\r
+\r
+Whatever this test result is, the execution of any file in ${TESTS}\r
+will fail with "permission denied" if it is not executable by\r
+the user running the tests.\r
+\r
+I think that as we're doing this "shortcut" instead of full file\r
+blacklisting, this should reduce the output less rather than\r
+more and therefore use the version provided in this patch\r
+instead of changing +111 to -100.\r
+\r
+(In the future I'd like to see that we had some convention to name\r
+the test scripts and either do comparison to that list or that\r
+convention also dictates order and this test could be removed. There\r
+are a few alternatives that we could think of...).\r
+\r
+> It's too bad "-executable" is a GNU extension.\r
+\r
+I'd have uses for that :D\r
+\r
+Tomi\r
+\r
+> Quoth Tomi Ollila on Jun 08 at 12:37 am:\r
+>> The find option syntax `-perm +111` is deprecated gnu find feature.\r
+>> The replacement `( -perm -100 -o -perm -10 -o -perm 1 )` should also\r
+>> work outside of the GNU domain.\r
+>> ---\r
+>> test/basic | 3 ++-\r
+>> 1 file changed, 2 insertions(+), 1 deletion(-)\r
+>>\r
+>> diff --git a/test/basic b/test/basic\r
+>> index 1b2a7d2..64eb7d7 100755\r
+>> --- a/test/basic\r
+>> +++ b/test/basic\r
+>> @@ -53,7 +53,8 @@ test_expect_code 2 'failure to clean up causes the test to fail' '\r
+>> test_begin_subtest 'Ensure that all available tests will be run by notmuch-test'\r
+>> eval $(sed -n -e '/^TESTS="$/,/^"$/p' $TEST_DIRECTORY/notmuch-test)\r
+>> tests_in_suite=$(for i in $TESTS; do echo $i; done | sort)\r
+>> -available=$(find "$TEST_DIRECTORY" -maxdepth 1 -type f -perm +111 \\r
+>> +available=$(find "$TEST_DIRECTORY" -maxdepth 1 -type f \\r
+>> + '(' -perm -100 -o -perm -10 -o -perm -1 ')' \\r
+>> ! -name aggregate-results.sh \\r
+>> ! -name arg-test \\r
+>> ! -name hex-xcode \\r
+> _______________________________________________\r
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