git-p4: test with limited p4 server results

Change the --changes-block-size git-p4 test to use an account with
limited "maxresults" and "maxscanrows" values.

These conditions are applied in the server *before* the "-m maxchanges"
parameter to "p4 changes" is applied, and so the strategy that git-p4
uses for limiting the number of changes does not work. As a result,
the tests all fail.

Note that "maxscanrows" is set quite high, as it appears to not only
limit results from "p4 changes", but *also* limits results from
"p4 print". Files that have more than "maxscanrows" changes seem
(experimentally) to be impossible to print. There's no good way to
work around this.

Signed-off-by: Luke Diamand <luke@diamand.org>
Acked-by: Lex Spoon <lex@lexspoon.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9818-git-p4-block.sh

@@ -8,6 +8,19 @@ test_expect_success 'start p4d' '
 	start_p4d
 '
 
+create_restricted_group() {
+	p4 group -i <<-EOF
+	Group: restricted
+	MaxResults: 7
+	MaxScanRows: 40
+	Users: author
+	EOF
+}
+
+test_expect_success 'Create group with limited maxrows' '
+	create_restricted_group
+'
+
 test_expect_success 'Create a repo with many changes' '
 	(
 		client_view "//depot/included/... //client/included/..." \
@@ -32,30 +45,34 @@ test_expect_success 'Create a repo with many changes' '
 	)
 '
 
-test_expect_success 'Clone the repo' '
+test_expect_success 'Default user cannot fetch changes' '
+	! p4 changes -m 1 //depot/...
+'
+
+test_expect_failure 'Clone the repo' '
 	git p4 clone --dest="$git" --changes-block-size=7 --verbose //depot/included@all
 '
 
-test_expect_success 'All files are present' '
+test_expect_failure 'All files are present' '
 	echo file.txt >expected &&
 	test_write_lines outer0.txt outer1.txt outer2.txt outer3.txt outer4.txt >>expected &&
 	test_write_lines outer5.txt >>expected &&
 	ls "$git" >current &&
 	test_cmp expected current
 '
 
-test_expect_success 'file.txt is correct' '
+test_expect_failure 'file.txt is correct' '
 	echo 55 >expected &&
 	test_cmp expected "$git/file.txt"
 '
 
-test_expect_success 'Correct number of commits' '
+test_expect_failure 'Correct number of commits' '
 	(cd "$git" && git log --oneline) >log &&
 	wc -l log &&
 	test_line_count = 43 log
 '
 
-test_expect_success 'Previous version of file.txt is correct' '
+test_expect_failure 'Previous version of file.txt is correct' '
 	(cd "$git" && git checkout HEAD^^) &&
 	echo 53 >expected &&
 	test_cmp expected "$git/file.txt"
@@ -85,7 +102,7 @@ test_expect_success 'Add some more files' '
 
 # This should pick up the 10 new files in "included", but not be confused
 # by the additional files in "excluded"
-test_expect_success 'Syncing files' '
+test_expect_failure 'Syncing files' '
 	(
 		cd "$git" &&
 		git p4 sync --changes-block-size=7 &&