Re: tar up a symbolic linked directory

2009-05-04 Thread Douglas A. Tutty 
On Sun, May 03, 2009 at 11:23:33PM -, Cameron Hutchison wrote:
 Douglas A. Tutty dtu...@vianet.ca writes:
 On Sat, May 02, 2009 at 09:04:38PM +, T o n g wrote:
  I want to tar up a symbolic linked directory as if it is a real
  directory. Is there any easy way to do it?
  
  Let me explain with an example (that you can try):
  
   mkdir d1
   touch d1/{a,b,c}
   ln -s c d1/d
   ln -s d1 d2
  
  I want that the result tar file looks like this:
  
   tar -tvzf d2.tgz
   drwxrwx--x tong/tong 0 2009-05-01 09:38 d2/
   -rw-rw tong/tong 0 2009-05-01 09:37 d2/a
   -rw-rw tong/tong 0 2009-05-01 09:37 d2/b
   -rw-rw tong/tong 0 2009-05-01 09:37 d2/c
   lrwxrwxrwx tong/tong 0 2009-05-01 09:38 d2/d - c
  
  Any easy way to do it? 
 
 add -h to the tar parameters.  It dereferences the symbolic lyinks.
 However, then you won't get the d2/d - c reference.
 
 I can't see that it would be possible to dereference the top-level
 symlink but no others. No commands that I know of support selective
 symlink dereferencing, except find(1) with -H.
 
 That lead me to try:
 $ find -H d2 | cpio -o -L -H ustar  d2.tar
 
 This comes close, storing d2/d as a link, but as a hardlink, not a
 symlink.

Before we get too far down the garden path, would you review the why
of this?

It may be simpler to do it in a couple of steps.  Tar up those you want
with the dereferencing, telling tar to ignore those you want without
dereferencing, then do a second tar run without dereferencing, telling
tar to ignore those you did with dereferencing, appending it to the
first tarball.

Doug.


-- 
To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org 
with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org

Re: tar up a symbolic linked directory

2009-05-04 Thread T o n g 
On Mon, 04 May 2009 13:48:07 -0400, Douglas A. Tutty wrote:

  I want to tar up a symbolic linked directory as if it is a real
  directory. Is there any easy way to do it?
  
  Let me explain with an example (that you can try). . .
 
 I can't see that it would be possible to dereference the top-level
 symlink but no others. No commands that I know of support selective
 symlink dereferencing, except find(1) with -H.
 
 That lead me to try:
 $ find -H d2 | cpio -o -L -H ustar  d2.tar
 
 This comes close, storing d2/d as a link, but as a hardlink, not a
 symlink.

Thanks. seems that this is the best approach so far. 

 Before we get too far down the garden path, would you review the why
 of this?

Simple -- I want to maintain an identical working environment across all 
places, in my prime home environment, or on remote sites, on Live CDs or 
their HD installations. The most important thing about the identical is 
logical identical, as oppose to physical. I.e., I expect a certain path 
name to be at a specific location, across all environments that I work 
in, despite the fact that such path name might be a symlink one to other 
folder on another volume with another name. 

 It may be simpler to do it in a couple of steps. . .

Thanks, but that still seems too complicated to me. So I'll propose to 
tar developers for my seems-legitimate request, to, either differentiate 
d2 and d2/ as sync does, or add a option similar to find -H. 

Thanks for the comments.

-- 
Tong (remove underscore(s) to reply)
  http://xpt.sourceforge.net/techdocs/
  http://xpt.sourceforge.net/tools/


-- 
To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org 
with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org

Re: tar up a symbolic linked directory

2009-05-03 Thread Douglas A. Tutty 
On Sat, May 02, 2009 at 09:04:38PM +, T o n g wrote:
 Hi, 
 
 I want to tar up a symbolic linked directory as if it is a real
 directory. Is there any easy way to do it?
 
 Let me explain with an example (that you can try):
 
  mkdir d1
  touch d1/{a,b,c}
  ln -s c d1/d
  ln -s d1 d2
 
 I want that the result tar file looks like this:
 
  tar -tvzf d2.tgz
  drwxrwx--x tong/tong 0 2009-05-01 09:38 d2/
  -rw-rw tong/tong 0 2009-05-01 09:37 d2/a
  -rw-rw tong/tong 0 2009-05-01 09:37 d2/b
  -rw-rw tong/tong 0 2009-05-01 09:37 d2/c
  lrwxrwxrwx tong/tong 0 2009-05-01 09:38 d2/d - c
 
 Any easy way to do it? 

add -h to the tar parameters.  It dereferences the symbolic lyinks.
However, then you won't get the d2/d - c reference.

Doug.


-- 
To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org 
with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org

Re: tar up a symbolic linked directory

2009-05-03 Thread Cameron Hutchison 
Douglas A. Tutty dtu...@vianet.ca writes:

On Sat, May 02, 2009 at 09:04:38PM +, T o n g wrote:
 Hi, 
 
 I want to tar up a symbolic linked directory as if it is a real
 directory. Is there any easy way to do it?
 
 Let me explain with an example (that you can try):
 
  mkdir d1
  touch d1/{a,b,c}
  ln -s c d1/d
  ln -s d1 d2
 
 I want that the result tar file looks like this:
 
  tar -tvzf d2.tgz
  drwxrwx--x tong/tong 0 2009-05-01 09:38 d2/
  -rw-rw tong/tong 0 2009-05-01 09:37 d2/a
  -rw-rw tong/tong 0 2009-05-01 09:37 d2/b
  -rw-rw tong/tong 0 2009-05-01 09:37 d2/c
  lrwxrwxrwx tong/tong 0 2009-05-01 09:38 d2/d - c
 
 Any easy way to do it? 

add -h to the tar parameters.  It dereferences the symbolic lyinks.
However, then you won't get the d2/d - c reference.

I can't see that it would be possible to dereference the top-level
symlink but no others. No commands that I know of support selective
symlink dereferencing, except find(1) with -H.

That lead me to try:
$ find -H d2 | cpio -o -L -H ustar  d2.tar

This comes close, storing d2/d as a link, but as a hardlink, not a
symlink.


-- 
To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org 
with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org