Merge branch 'jk/test-chainlint-softer'

The "chainlint" feature in the test framework is a handy way to
catch common mistakes in writing new tests, but tends to get
expensive.  An knob to selectively disable it has been introduced
to help running tests that the developer has not modified.

* jk/test-chainlint-softer:
  t: avoid sed-based chain-linting in some expensive cases

t/README

@@ -196,6 +196,11 @@ appropriately before running "make". Short options can be bundled, i.e.
 	this feature by setting the GIT_TEST_CHAIN_LINT environment
 	variable to "1" or "0", respectively.
 
+	A few test scripts disable some of the more advanced
+	chain-linting detection in the name of efficiency. You can
+	override this by setting the GIT_TEST_CHAIN_LINT_HARDER
+	environment variable to "1".
+
 --stress::
 	Run the test script repeatedly in multiple parallel jobs until
 	one of them fails.  Useful for reproducing rare failures in

t/t0027-auto-crlf.sh

@@ -386,7 +386,9 @@ test_expect_success 'setup main' '
 	test_tick
 '
 
-
+# Disable extra chain-linting for the next set of tests. There are many
+# auto-generated ones that are not worth checking over and over.
+GIT_TEST_CHAIN_LINT_HARDER_DEFAULT=0
 
 warn_LF_CRLF="LF will be replaced by CRLF"
 warn_CRLF_LF="CRLF will be replaced by LF"
@@ -597,6 +599,9 @@ do
 	checkout_files     auto  "$id" ""     false   native   $NL   CRLF  CRLF_mix_LF  LF_mix_CR    LF_nul
 done
 
+# The rest of the tests are unique; do the usual linting.
+unset GIT_TEST_CHAIN_LINT_HARDER_DEFAULT
+
 # Should be the last test case: remove some files from the worktree
 test_expect_success 'ls-files --eol -d -z' '
 	rm crlf_false_attr__CRLF.txt crlf_false_attr__CRLF_mix_LF.txt crlf_false_attr__LF.txt .gitattributes &&

t/t3070-wildmatch.sh

@@ -4,6 +4,11 @@ test_description='wildmatch tests'
 
 . ./test-lib.sh
 
+# Disable expensive chain-lint tests; all of the tests in this script
+# are variants of a few trivial test-tool invocations, and there are a lot of
+# them.
+GIT_TEST_CHAIN_LINT_HARDER_DEFAULT=0
+
 should_create_test_file() {
 	file=$1
 

t/test-lib.sh

@@ -947,8 +947,11 @@ test_run_ () {
 		trace=
 		# 117 is magic because it is unlikely to match the exit
 		# code of other programs
-		if $(printf '%s\n' "$1" | sed -f "$GIT_BUILD_DIR/t/chainlint.sed" | grep -q '?![A-Z][A-Z]*?!') ||
-			test "OK-117" != "$(test_eval_ "(exit 117) && $1${LF}${LF}echo OK-\$?" 3>&1)"
+		if test "OK-117" != "$(test_eval_ "(exit 117) && $1${LF}${LF}echo OK-\$?" 3>&1)" ||
+		   {
+			test "${GIT_TEST_CHAIN_LINT_HARDER:-${GIT_TEST_CHAIN_LINT_HARDER_DEFAULT:-1}}" != 0 &&
+			$(printf '%s\n' "$1" | sed -f "$GIT_BUILD_DIR/t/chainlint.sed" | grep -q '?![A-Z][A-Z]*?!')
+		   }
 		then
 			BUG "broken &&-chain or run-away HERE-DOC: $1"
 		fi