[PATCH v4 2/3] test-lib.sh: remove the now-unused "test_untraceable" facility

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

In the preceding commit the use of "test_untraceable=UnfortunatelyYes"
was removed from "t1510-repo-setup.sh" in favor of more narrow
redirections of the output of specific commands (and not entire
sub-shells or functions).

This is in line with the fixes in the series that introduced the
"test_untraceable" facility. See 571e472dc43 (Merge branch
'sg/test-x', 2018-03-14) for the series as a whole, and
e.g. 91538d0cde9 (t5570-git-daemon: don't check the stderr of a
subshell, 2018-02-24) for a commit that's in line with the changes in
the preceding commit.

We've thus solved the TODO item noted when "test_untraceable" was
added to "t1510-repo-setup.sh" in 58275069288 (t1510-repo-setup: mark
as untraceable with '-x', 2018-02-24).

So let's remove the feature entirely. Not only is it currently unused,
but it actively encourages an anti-pattern in our tests. We should be
testing the output of specific commands, not entire subshells or
functions.

That the "-x" output had to be disabled as a result is only one
symptom, but even under bash those tests will be harder to debug as
the subsequent check of the redirected file will be far removed from
the command that emitted the output.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 t/README      |  3 ---
 t/test-lib.sh | 23 -----------------------
 2 files changed, 26 deletions(-)

diff --git a/t/README b/t/README
index 29f72354bf1..3d30bbff34a 100644
--- a/t/README
+++ b/t/README
@@ -86,9 +86,6 @@ appropriately before running "make". Short options can be bundled, i.e.
 -x::
 	Turn on shell tracing (i.e., `set -x`) during the tests
 	themselves. Implies `--verbose`.
-	Ignored in test scripts that set the variable 'test_untraceable'
-	to a non-empty value, unless it's run with a Bash version
-	supporting BASH_XTRACEFD, i.e. v4.1 or later.
 
 -d::
 --debug::
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 57efcc5e97a..ddfa0567e9e 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -381,29 +381,6 @@ then
 	exit
 fi
 
-if test -n "$trace" && test -n "$test_untraceable"
-then
-	# '-x' tracing requested, but this test script can't be reliably
-	# traced, unless it is run with a Bash version supporting
-	# BASH_XTRACEFD (introduced in Bash v4.1).
-	#
-	# Perform this version check _after_ the test script was
-	# potentially re-executed with $TEST_SHELL_PATH for '--tee' or
-	# '--verbose-log', so the right shell is checked and the
-	# warning is issued only once.
-	if test -n "$BASH_VERSION" && eval '
-	     test ${BASH_VERSINFO[0]} -gt 4 || {
-	       test ${BASH_VERSINFO[0]} -eq 4 &&
-	       test ${BASH_VERSINFO[1]} -ge 1
-	     }
-	   '
-	then
-		: Executed by a Bash version supporting BASH_XTRACEFD.  Good.
-	else
-		echo >&2 "warning: ignoring -x; '$0' is untraceable without BASH_XTRACEFD"
-		trace=
-	fi
-fi
 if test -n "$trace" && test -z "$verbose_log"
 then
 	verbose=t
-- 
2.34.1.1024.g573f2f4b767