[PATCH] test-in-container: Do not set GCONV_PATH, LOCPATH

[Florian Weimer <fweimer@redhat.com>]

These environment variables are incorrect inside the container.

2019-05-20  Florian Weimer  <fweimer@redhat.com>

	test-in-container: Do not set GCONV_PATH, LOCPATH.
	* Makeconfig (run-program-env-container): New variable.
	(run-program-env): Use it.
	* Rules ($(tests-container:%=$(objpfx)%.out)): Update comment.
	Use $(run-program-env-container) instead of $(run-program-env).

diff --git a/Makeconfig b/Makeconfig
index 0e386fbc19..2fbd3c0192 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -743,10 +743,13 @@ run-via-rtld-prefix =							      \
 else
 run-via-rtld-prefix =
 endif
+# Test-in-containers need fewer environment variables.
+run-program-env-container = LC_ALL=C
 # $(run-program-env) is the default environment variable settings to
 # use when running a program built with the newly built library.
 run-program-env = GCONV_PATH=$(common-objpfx)iconvdata \
-		  LOCPATH=$(common-objpfx)localedata LC_ALL=C
+		  LOCPATH=$(common-objpfx)localedata \
+		  $(run-program-env-container)
 # $(run-program-prefix) is a command that, when prepended to the name
 # of a program built with the newly built library, produces a command
 # that, executed on the build system on which "make" is run, runs that
diff --git a/Rules b/Rules
index 222dba6dcb..2c8f1eecb0 100644
--- a/Rules
+++ b/Rules
@@ -273,10 +273,15 @@ $(objpfx)%.out: /dev/null $(objpfx)%	# Make it 2nd arg for canned sequence.
 # Any tests that require an isolated container (filesystem, network
 # and pid namespaces) in which to run, should be added to
 # tests-container.
+#
+# Note: Outer use of $(run-program-env-container) instead of
+# $(run-program-env) assumes that support/test-container does not use
+# locales or gconv modules.
 $(tests-container:%=$(objpfx)%.out): $(objpfx)%.out : $(if $(wildcard $(objpfx)%.files),$(objpfx)%.files,/dev/null) $(objpfx)%
-	$(test-wrapper-env) $(run-program-env) $(run-via-rtld-prefix) \
-	  $(common-objpfx)support/test-container env $(run-program-env) $($*-ENV) \
-	  $(host-test-program-cmd) $($*-ARGS) > $@; \
+	$(test-wrapper-env) $(run-program-env-container) \
+          $(run-via-rtld-prefix) \
+	  $(common-objpfx)support/test-container env $($*-ENV) \
+	    $(host-test-program-cmd) $($*-ARGS) > $@; \
 	$(evaluate-test)