[Errno 18] Invalid cross-device link using os.rename

Discussion in 'Python' started by Scott Whitney, Feb 14, 2005.

  1. oldName=/backup/backups/data/WWW_httpd.conf_backups/20050204.httpd.conf

    newName=/backup_old/data/WWW_httpd.conf_backups/20050204.httpd.conf

    os.rename(oldName,newName) gives:

    OSError: [Errno 18] Invalid cross-device link

    mv from the shell works fine.

    This is Python 2.2.3 from RedHat 9.0.

    Any suggestions (other than os.system('mv %s %s')?)
     
    Scott Whitney, Feb 14, 2005
    #1
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  2. catch exception and copy if error == errno.EXDEV.

    (this is what "mv" does, of course)

    or use shutil.move:
    Help on function move in module shutil:

    move(src, dst)
    Recursively move a file or directory to another location.

    If the destination is on our current filesystem, then simply use
    rename. Otherwise, copy src to the dst and then remove src.
    A lot more could be done here... A look at a mv.c shows a lot of
    the issues this implementation glosses over.

    </F>
     
    Fredrik Lundh, Feb 14, 2005
    #2
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  3. Scott  Whitney

    Jeff Epler Guest

    mv is a surprisingly complex program, while os.rename is a wrapper
    around rename(2) which is probably documented on your system to return
    EXDEV under these circumstanes.

    os.xxx is generally a fairly thin wrapper around what your OS provides,
    and inherits all the "gotchas". For some activities, os.shutil provides
    something that is between os.xxx and os.system("xxx") in complexity and
    capability.

    Jeff

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    Jeff Epler, Feb 15, 2005
    #3
  4. Scott  Whitney

    JustScott Guest

    Thanks, Jeff. I appreciate the input. I just stuck with os.system('mv
    %s %s'). Seems to work fine.
     
    JustScott, Feb 16, 2005
    #4
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