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

[Jeff King <peff@peff.net>]

On Thu, Jan 15, 2015 at 04:04:24PM -0800, Junio C Hamano wrote:

> I wondered what 'perl -e 'print $>' would say in mingw, and if that
> is portable enough, though.

Good thinking. I guess the best way to find out is to convince somebody
from msysgit to try this patch. :)

We may simply find that nobody there even has apache installed on their
box, and they do not run the http tests at all.

-- >8 --
The SANITY prerequisite is really about whether the
filesystem will respect the permissions we set, and being
root is only one part of that. But the httpd tests really
just care about not being root, as they are trying to avoid
weirdness in apache (see a1a3011 for details).

Let's switch out SANITY for a new NOT_ROOT prerequisite,
which will let us tweak SANITY more freely.

We implement NOT_ROOT by checking perl's "$>" variable,
since we cannot rely on the "id" program being available
everywhere (and we would rather avoid writing a custom C
program to run geteuid if we can).

Note that we cannot just call this "ROOT" and ask for
"!ROOT". The possible outcomes are:

  1. we know we are root

  2. we know we are not root

  3. we could not tell, because perl was not installed or
     barfed showing us $>

We should conservatively treat (3) as "does not have the
prerequisite", which means that a naive negation would not
work.

Signed-off-by: Jeff King <peff@peff.net>
---
 t/lib-httpd.sh | 2 +-
 t/test-lib.sh  | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/t/lib-httpd.sh b/t/lib-httpd.sh
index fd53b57..d154d1e 100644
--- a/t/lib-httpd.sh
+++ b/t/lib-httpd.sh
@@ -37,7 +37,7 @@ then
 	test_done
 fi
 
-if ! test_have_prereq SANITY; then
+if ! test_have_prereq NOT_ROOT; then
 	test_skip_or_die $GIT_TEST_HTTPD \
 		"Cannot run httpd tests as root"
 fi
diff --git a/t/test-lib.sh b/t/test-lib.sh
index bb1402d..60020ca 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1040,3 +1040,8 @@ test_lazy_prereq UNZIP '
 	"$GIT_UNZIP" -v
 	test $? -ne 127
 '
+
+test_lazy_prereq NOT_ROOT '
+	uid=$(perl -e "print \$<") &&
+	test "$uid" != 0
+'
-- 
2.2.1.425.g441bb3c

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