X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=tests%2Fincremen.sh;h=7e05da66592b9f77d14012985632a33772ed33ca;hb=82eff37f6fbf853b4f32bdc0ef822192c0a31b91;hp=c723e9c9b66b2c2fc26cb64122373296865f28d6;hpb=70fdfd4fa136db573a473fcb30a6e2d8e58e5c72;p=chaz%2Ftar

diff --git a/tests/incremen.sh b/tests/incremen.sh
index c723e9c..7e05da6 100755
--- a/tests/incremen.sh
+++ b/tests/incremen.sh
@@ -1,18 +1,52 @@
 #! /bin/sh
+
 # A directory older than the listed entry was skipped completely.
 
+# This file is part of GNU tar testsuite.
+# Copyright (C) 2004 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+
 . ./preset
+TAR_ARCHIVE_FORMATS="gnu oldgnu"
 . $srcdir/before
 
 set -e
 mkdir structure
-touch structure/file
-# FIXME: The sleep is necessary for the second tar to work.  Exactly why?
+echo x >structure/file
+
+# On Nextstep (and perhaps other 4.3BSD systems),
+# a newly created file's ctime isn't updated
+# until the next sync or stat operation on the file.
+ls -l structure/file >/dev/null
+
+# If the time of an initial backup and the creation time of a file contained
+# in that backup are the same, the file will be backed up again when an
+# incremental backup is done, because the incremental backup backs up
+# files created `on or after' the initial backup time.  Without the sleep
+# command, behaviour of tar becomes variable, depending whether the system
+# clock ticked over to the next second between creating the file and
+# backing it up.
 sleep 1
+
 tar cf archive --listed=list structure
 tar cfv archive --listed=list structure
 echo -----
-touch structure/file
+sleep 1
+echo y >structure/file
 tar cfv archive --listed=list structure
 
 out="\