cpio deleting source files. Can't figure out why! Post: 302677735

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Operating Systems HP-UX cpio deleting source files. Can't figure out why! Post 302677735 by paqman on Thursday 26th of July 2012 03:24:31 PM

07-26-2012

Registered User

cpio deleting source files. Can't figure out why!

So I ran into a strange problem the other day when using cpio. I'm not really sure this needed to be in an HPUX specific forum, but wasn't sure where else to put it. I'm running HPUX 11.11 PARISC.

I was using cpio to copy a directory and its entire contents from one server, we'll call it server A, to another server, we'll call it server B, via an NFS mount.

Server A is exporting /source/dir, and server B is mounting it as a client, mounting it as /nfs/source/dir. My current working directory on server B was /nfs/source/dir. As you can see, I am trying to copy all the contents of /nfs/source/dir into /dest/dir. here is the command I ran, sitting inside /nfs/source/dir:

Code:

find . | cpio -pmduv /dest/dir/.

It copied all the files to the destination directory just fine, but after it did that it prompted me with a message asking if it's ok to delete a file. I wasn't sure what file it was referencing, but I didn't want to delete anything, so I told it no, and it went on to ask me about more files. I cancelled out of it. Well it seems that it deleted some files without prompting me before I got the first prompt. (I think permissions of some files allowed it to delete without prompting me)

Why would cpio remove files from the source after the copy was done?

I found a couple links referencing a similar issue, but I'm not doing it the same way as either of them. Here are the links in case you're curious:
[TCLUG] cpio bug?
[Bug-cpio] CPIO can also delete the files from destination location.

I tried reproducing the problem in a test directory and couldn't do it. Even using the methods used in those links, (which are very old), I couldn't get it to replicate the problem. I did get it to give me an error saying that it couldn't copy from one directory to the same directory, when trying to basically copy from one directory back to itself, but it certainly didn't try deleting anything, and it's not even close to the command I was running.

Any ideas as to why this would happen?

Last edited by paqman; 07-26-2012 at 06:32 PM..

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LEARN ABOUT HPUX

cpio

cpio(4) 						     Kernel Interfaces Manual							   cpio(4)

NAME

       cpio - format of cpio archive

DESCRIPTION

       The header structure, when the option of is not used (see cpio(1)), is:

       When the option is used, the header information is described by:

       Longtime  and Longfile are equivalent to and respectively.  The contents of each file are recorded together with other items describing the
       file.  Every instance of contains the constant 070707 (octal).  The items through have meanings explained in stat(2).  The  length  of  the
       null-terminated path name including the null byte, is given by

       The last record of the archive always contains the name Directories and the trailer are recorded with equal to zero.

       It  will not always be the case that and correspond to the results of but the values are always sufficient to tell whether two files in the
       archive are linked to each other.

       When a device special file is archived by HP-UX (using the option), contains a magic constant which is dependent  upon  the  implementation
       doing  the writing.  flags the device file as an HP-UX 32-bit device specifier, and contains the 32-bit device specifier (see stat(2)).	If
       the option is not present, special files are not archived or restored.  Non-HPUX device special files are never restored.

SEE ALSO

       cpio(1), find(1), stat(2).

STANDARDS CONFORMANCE

																	   cpio(4)