cp -pu NTFS problem

Shane squindler at gmail.com
Thu Dec 9 11:22:46 CST 2010


I run into this all the time - similar situation too ... I found that
NTFS mounted on linux just doesn't like mtimes.  ctime comparison and
updating worked fine, I'm yet to find a workaround to this either -
quite painful problem really as it affects lots of *nix tools for
backup - eg rsync, scp, cp ...

My workaround have been to install git and push / pull / clone between
home / work / usb.

Shane.


On 9 December 2010 11:06, Garry Trethewey <garrytre at bigpond.com> wrote:
>
> Hi all
>
>
> Problem
> cp -pu doesn't seem to work properly with timestamps from an ntfs partition.
>
> Just to remind people,
> -p     same as --preserve=mode,ownership,timestamps
> -u, --update copy only when the SOURCE file is newer than the
> destination file or when the destination file is missing
>
> Here's the gory details.
>
> For a couple of years I've been doing
> cp -puv -t $dest $source
> from one ext3 partition to another, no problem.
>
> But now I've copied my whole data disk to an NTFS partition on a USB
> portable hard drive. NTFS so I can use it at work.
>
> I want to copy files from this NTFS partition to an ext3 destination
> with timestamps intact, so that next week when I do the same thing, I
> only copy new or changed files.
>
>
>
> My code is
> source=/media/data/aaa_S500_data/*    # the NTFS partition
> dest='/home/garry/Desktop/junk'       # a ext3 partition
> cp -puv -t $dest $source
>
>
> Here is a demo source directory
> garry at S500-lucid:~$ ls -l /media/data/aaa_S500_data/
> total 64
> -rwxrwxrwx 1 garry garry 38254 2010-12-02 06:20 elephantGreen.ico
> -rwxrwxrwx 1 garry garry  5978 2010-10-25 17:27 elephant.ico
> -rwxrwxrwx 1 garry garry    69 2010-11-30 05:55 readme.txt
> -rwxrwxrwx 1 garry garry   766 2002-10-14 04:27 wdlogo.ico
> -rwxrwxrwx 1 garry garry  5978 2010-10-25 17:27 wooly-mammoth.ico
> garry at S500-lucid:~$
>
>
> So into an empty directory, '/home/garry/Desktop/junk'  I copy
> garry at S500-lucid:~$ cp -puv  -t '/home/garry/Desktop/junk'
> /media/data/aaa_S500_data/*
> `/media/data/aaa_S500_data/elephantGreen.ico' ->
> `/home/garry/Desktop/junk/elephantGreen.ico'
> `/media/data/aaa_S500_data/elephant.ico' ->
> `/home/garry/Desktop/junk/elephant.ico'
> `/media/data/aaa_S500_data/readme.txt' ->
> `/home/garry/Desktop/junk/readme.txt'
> `/media/data/aaa_S500_data/wdlogo.ico' ->
> `/home/garry/Desktop/junk/wdlogo.ico'
> `/media/data/aaa_S500_data/wooly-mammoth.ico' ->
> `/home/garry/Desktop/junk/wooly-mammoth.ico'
> garry at S500-lucid:~$
>
> Then without changing any files in $source, and if I do
> cp -puv  -t '/home/garry/Desktop/junk' /media/data/aaa_S500_data/*
> again, nothing should be copied.
>
> But the two files that were created / altered on the NTFS partition
> _AFTER_ it got created with gparted & partimage get copied again.
>
> garry at S500-lucid:~$ cp -puv  -t '/home/garry/Desktop/junk'
> /media/data/aaa_S500_data/*
> `/media/data/aaa_S500_data/elephantGreen.ico' ->
> `/home/garry/Desktop/junk/elephantGreen.ico'
> `/media/data/aaa_S500_data/readme.txt' ->
> `/home/garry/Desktop/junk/readme.txt'
> garry at S500-lucid:~$
>
> and again
>
> garry at S500-lucid:~$ cp -puv -t $dest $source
> `/media/data/aaa_S500_data/elephantGreen.ico' ->
> `/home/garry/Desktop/junk/elephantGreen.ico'
> `/media/data/aaa_S500_data/readme.txt' ->
> `/home/garry/Desktop/junk/readme.txt'
>
>
> So it seems that cp -pu is recognising something that it needs to copy,
> but not what it's supposed to.
>
> Have I conceptualised the problem correctly or is there something else
> going on that I'm missing?
>
> Is there a fix or workaround?
>
> regards
>
> ------------------------------------
> Garry Trethewey
> ------------------------------------
>
>
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