Date: 09 Sep 2005 14:33:37 -0400 From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: gjbailey@gmail.com Cc: kientzle@freebsd.org, freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: tar -u adds all files regardless of mod date Message-ID: <44u0guw0ou.fsf@be-well.ilk.org> In-Reply-To: <48a5f32a05090901591a16c062@mail.gmail.com> References: <48a5f32a05090901591a16c062@mail.gmail.com>
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Gareth Bailey <gjbailey@gmail.com> writes: > I have a directory I want to backup at /usr/dir_a/dir_b. > I want to back the content of this dir to /usr/backups/dir_b > so I tried the following: > > # cd /usr/backups/dir_b > # tar -cf dir_b.tar /usr/dir_a/dir_b > > Now I have dir_b.tar which is 65MB in size. > If i then try to update modified files by doing this: > > # tar -uf dir_b.tar /usr/dir_a/dir_b > > and I end up with dir_b.tar being 130MB (double size) which > should not be the case since no files have been modified in > /usr/dir_a/dir_b. > > I do not get this problem if I do the same in the /usr/dir_a > directory. In the /usr/dir_a dir the tar file remains the same > size. > > I would much appreciate some input! [This essentially adds up to doing # tar -cf foo.tar $target_path and then immediately # tar -uvf foo.tar $target_path shows an update.] You didn't list any information about your system, so I don't even know whether you're using the Gnu tar or the libarchive one, which has been standard for a few months now. However, I'm seeing something like that on RELENG_5, with the new tar. It isn't happening to all files, though, and I haven't figured out why it's picking the files it is...
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