tar/tests/incremen.sh

#! /bin/sh
# A directory older than the listed entry was skipped completely.

. ./preset
. $srcdir/before

set -e
mkdir structure
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 --format=gnu --listed=list structure
tar cfv archive --format=gnu --listed=list structure
echo -----
sleep 1
echo y >structure/file
tar cfv archive --format=gnu --listed=list structure

out="\
structure/
-----
structure/
structure/file
"

. $srcdir/after