From e70e24a73871e4e23f068c7e556e2cb6106f1f36 Mon Sep 17 00:00:00 2001
From: Tobias Stoeckmann <tobias@stoeckmann.org>
Date: Fri, 30 May 2025 17:32:02 +0200
Subject: [PATCH] test_utils: Reset all locale related entries

Reset current locale settings through setlocale and also all
environment variables which might affect test cases which
spawn children through systemf which in turn would call setlocale
on their own, e.g. bsdtar.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
---
 test_utils/test_main.c | 57 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 55 insertions(+), 2 deletions(-)

diff --git a/test_utils/test_main.c b/test_utils/test_main.c
index 98f77b671..afd077fc6 100644
--- a/test_utils/test_main.c
+++ b/test_utils/test_main.c
@@ -3554,6 +3554,59 @@ test_summarize(int failed, int skips_num)
 	memset(failed_lines, 0, sizeof(failed_lines));
 }
 
+/*
+ * Set or unset environment variable.
+ */
+static void
+set_environment(const char *key, const char *value)
+{
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+	if (!SetEnvironmentVariable(key, value)) {
+		fprintf(stderr, "SetEnvironmentVariable failed with %d\n",
+		    (int)GetLastError());
+	}
+#else
+	if (value == NULL) {
+		if (unsetenv(key) == -1)
+			fprintf(stderr, "unsetenv: %s\n", strerror(errno));
+	} else {
+		if (setenv(key, value, 1) == -1)
+			fprintf(stderr, "setenv: %s\n", strerror(errno));
+	}
+#endif
+}
+
+/*
+ * Enforce C locale for (sub)processes.
+ */
+static void
+set_c_locale()
+{
+	static const char *lcs[] = {
+		"LC_ADDRESS",
+		"LC_ALL",
+		"LC_COLLATE",
+		"LC_CTYPE",
+		"LC_IDENTIFICATION",
+		"LC_MEASUREMENT",
+		"LC_MESSAGES",
+		"LC_MONETARY",
+		"LC_NAME",
+		"LC_NUMERIC",
+		"LC_PAPER",
+		"LC_TELEPHONE",
+		"LC_TIME",
+		NULL
+	};
+	size_t i;
+
+	setlocale(LC_ALL, "C");
+	set_environment("LANG", "C");
+	for (i = 0; lcs[i] != NULL; i++)
+		set_environment(lcs[i], NULL);
+}
+
 /*
  * Actually run a single test, with appropriate setup and cleanup.
  */
@@ -3629,7 +3682,7 @@ test_run(int i, const char *tmpdir)
 		exit(1);
 	}
 	/* Explicitly reset the locale before each test. */
-	setlocale(LC_ALL, "C");
+	set_c_locale();
 	/* Record the umask before we run the test. */
 	umask(oldumask = umask(0));
 	/*
@@ -3643,7 +3696,7 @@ test_run(int i, const char *tmpdir)
 	/* Restore umask */
 	umask(oldumask);
 	/* Reset locale. */
-	setlocale(LC_ALL, "C");
+	set_c_locale();
 	/* Reset directory. */
 	if (!assertChdir(tmpdir)) {
 		fprintf(stderr, "ERROR: Couldn't chdir to temp dir %s\n",
-- 
2.47.3