From 6ec7d1881c0be453c7ece03a7dcc51681c514778 Mon Sep 17 00:00:00 2001
From: Paul Smith <psmith@gnu.org>
Date: Thu, 16 Sep 1999 03:43:10 +0000
Subject: * Fix some tests.

---
 Makefile.am          |  1 +
 tests/ChangeLog      | 10 ++++++++++
 tests/test_driver.pl | 35 ++++++++++++++++++++++++++++-------
 3 files changed, 39 insertions(+), 7 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index bb613c3..1319654 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -116,6 +116,7 @@ check-regression:
 	  if $(PERL) -v >/dev/null 2>&1; then \
 	    case `cd $(srcdir); pwd` in `pwd`) : ;; \
 	      *) test -d tests || mkdir tests; \
+		 rm -f srctests; \
 		 if ln -s "$(srcdir)/tests" srctests; then \
 		   for f in run_make_tests run_make_tests.pl test_driver.pl scripts; do \
 		     rm -f tests/$$f; ln -s ../srctests/$$f tests; \
diff --git a/tests/ChangeLog b/tests/ChangeLog
index ee4b4a3..dd763b1 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,5 +1,15 @@
 1999-09-15  Paul D. Smith  <psmith@gnu.org>
 
+	* test_driver.pl (touch): Rewrite this function.  Previously it
+	used to use utime() to hard-set the time based on the current
+	local clock.  This fails badly on networked filesystems where the
+	FS server clock is skewed from the local clock: normally modifying
+	a file causes it to get a mod time based on the _server's_ clock.
+	Hard-setting it based on the _local_ clock causes gratuitous
+	errors and makes the tests unreliable except on local filesystems.
+	The new function will simply modify the file, allowing the
+	filesystem to set the mod time as it sees fit.
+
 	* scripts/features/parallelism: The second test output could
 	change depending on how fast some scripts completed; use "sleep"
 	to force the order we want.
diff --git a/tests/test_driver.pl b/tests/test_driver.pl
index 7dd7fda..001d247 100644
--- a/tests/test_driver.pl
+++ b/tests/test_driver.pl
@@ -785,19 +785,40 @@ sub remove_directory_tree_inner
   return 1;
 }
 
+# We used to use this behavior for this function:
+#
+#sub touch
+#{
+#  local (@filenames) = @_;
+#  local ($now) = time;
+#  local ($file);
+#
+#  foreach $file (@filenames)
+#  {
+#    utime ($now, $now, $file)
+#          || (open (TOUCHFD, ">> $file") && close (TOUCHFD))
+#               || &error ("Couldn't touch $file: $!\n", 1);
+#  }
+#  return 1;
+#}
+#
+# But this behaves badly on networked filesystems where the time is
+# skewed, because it sets the time of the file based on the _local_
+# host.  Normally when you modify a file, it's the _remote_ host that
+# determines the modtime, based on _its_ clock.  So, instead, now we open
+# the file and write something into it to force the remote host to set
+# the modtime correctly according to its clock.
+#
+
 sub touch
 {
   local (@filenames) = @_;
-  local ($now) = time;
   local ($file);
 
-  foreach $file (@filenames)
-  {
-    utime ($now, $now, $file)
-          || (open (TOUCHFD, ">> $file") && close (TOUCHFD))
-               || &error ("Couldn't touch $file: $!\n", 1);
+  foreach $file (@filenames) {
+    (open(T, ">> $file") && print(T "\n") && close(T))
+	|| &error("Couldn't touch $file: $!\n", 1);
   }
-  return 1;
 }
 
 # open a file, write some stuff to it, and close it.
-- 
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