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Message from discussion Appending files to a cpio archive with gzip
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brumik  
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 More options Nov 5 2012, 2:50 am
Newsgroups: comp.unix.shell
From: brumik <brum...@gmail.com>
Date: Sun, 4 Nov 2012 23:50:47 -0800 (PST)
Local: Mon, Nov 5 2012 2:50 am
Subject: Re: Appending files to a cpio archive with gzip
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On Nov 5, 4:20 am, Barry Margolin <bar...@alum.mit.edu> wrote:

> In article <k76io1$v7...@news.xmission.com>,
>  gaze...@shell.xmission.com (Kenny McCormack) wrote:

> > In article <barmar-18FAF5.15094004112...@news.eternal-september.org>,
> > Barry Margolin  <bar...@alum.mit.edu> wrote:
> > ...
> > >You can't append to an existing compressed file.  You have to decompress
> > >it, add to that, and then recompress.

> > Oopsie!

> > From "man gzip":

> > ADVANCED USAGE
> >        Multiple  compressed  files  can  be concatenated. In this case, gunzip
> >        will extract all members at once. For example:

> >              gzip -c file1  > foo.gz
> >              gzip -c file2 >> foo.gz

> >        Then

> >              gunzip -c foo

> >        is equivalent to

> >              cat file1 file2

> > Whether this works with tar and/or cpio (or any other archiving format) is,
> > of course, a function of the particular archiver format chosen.

> > >The fact that it contains a cpio archive is irrelevant -- this is just
> > >the nature of the gzip file format.

> > Actually, as you now see, it does matter.

> Oops, sorry.

> So the question then is whether you can append one cpio archive onto
> another.  Because your original attempt is effectively equivalent to:

> ( find test | cpio -o; find test1 | cpio ) | gzip -c

> --
> Barry Margolin, bar...@alum.mit.edu
> Arlington, MA
> *** PLEASE post questions in newsgroups, not directly to me ***

I tried this but still cant get it to work, by example I want to
archive all files in dir1, but only directories in dir2 to the
archive:

# find . | sort
.
./dir1
./dir1/testfile
./dir2
./dir2/dir_to_backup
./dir2/dont_backup_file

# ( find dir1 | cpio -ov; find dir2 -type d | cpio -ov ) | gzip -c > /
var/tmp/testarchive.cpio.gz
dir1
dir1/testfile
1 blocks
dir2
dir2/dir_to_backup
1 blocks

# gzip -dc /var/tmp/testarchive.cpio.gz | cpio -it
dir1
dir1/testfile
1 blocks

As we see only dir1 was archived, unfortunately despite many tries I
cant find a way to use the find command (solaris) to find all given
files in a directory but *only* print directory names under dir2 (in
one command), hence was using two find commands,


 
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