GNU logs - #17963, boring messages

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Subject: bug#17963: strange behavior of cp
Resent-From: Paul E Condon <pecondon@HIDDEN>
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Date: Sun, 6 Jul 2014 18:10:44 -0600
From: Paul E Condon <pecondon@HIDDEN>
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I have a situation in which I want to merge two file
sturctures by copying one of the structures onto the
other with the following command:

cp -aulv arxivBtry1/host/* arxivBtry2/host/

This should, I believe, make hardlinks into arxivBtry2/host/ for any
plain file that is present in arxivBtry1/host/ if a newer version of
that file is not already present in arxivBtry2/host/. And, also I
think that if I interrupt this statement and restart it, it should do
nothing to the hardlinks it has already inserted in arxivBtry2/host/
silently.  But when I try this resume operation I get a long list of
reports of removing files from arxivBtry2/host/. Why? Examination of
arxivBtry2/host/, using ls -la indicates that the file in arxivBtry2/host/
that was reported removed is still there, so the removal reports seem
to be false reports.

More details about the environment:

Both arxivBtry1/host/ and arxivBtry2/host/ are directories on an
external harddisk that has 3 TeraB capacity and is half full. This ls
output:

root@big:/media/gfx2/hostmrg2# ls -ls
total 44
4 drwxr-xr-x 3 root root 4096 20140701_144028 arxivAtry1
4 drwxr-xr-x 3 root root 4096 20140630_185519 arxivBtry1
4 drwxr-xr-x 3 root root 4096 20140705_105447 arxivBtry2
4 drwxr-xr-x 3 root root 4096 20140702_071706 glb2try1
4 drwxr-xr-x 3 root root 4096 20140701_154330 glbltry1
4 drwxr-xr-x 3 root root 4096 20140701_150432 mrg4try1
4 drwx------ 3 root root 4096 20140705_102058 sgt1fxd
4 drwxr-xr-x 3 root root 4096 20140702_215246 sgt1xxx
4 drwxr-xr-x 3 root root 4096 20140701_144837 wdp71try1
4 drwxr-xr-x 3 root root 4096 20140701_123858 wdp7vtry1
4 drwxr-xr-x 3 root root 4096 20140630_231448 wdp8try1
root@big:/media/gfx2/hostmrg2# 

The other lines in this listing are other directories
each of which also has a sub-directory named 'host'.
Once I understand what's going on, I intend to merge
them into arxivBtry2/host/, also.

I'd be happy to call this behavior a feature, not a
bug, if it is already known to you and known to 
cause not harm to the actual merge of the plain files
of the two structures into one structure. 

Thanks for your help,
-- 
Paul E Condon           
pecondon@HIDDEN

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Paul E Condon <pecondon@HIDDEN>
Subject: bug#17963: Acknowledgement (strange behavior of cp)
Message-ID: <handler.17963.B.14046918778248.ack <at> debbugs.gnu.org>
References: <20140707001044.GA2710@HIDDEN>
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Date: Mon, 07 Jul 2014 00:12:02 +0000

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Message sent to bug-coreutils@HIDDEN:

Subject: bug#17963: strange behavior of cp
Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady <P@HIDDEN>
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Date: Mon, 07 Jul 2014 16:44:16 +0100
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On 07/07/2014 01:10 AM, Paul E Condon wrote:
> 
> I have a situation in which I want to merge two file
> sturctures by copying one of the structures onto the
> other with the following command:
> 
> cp -aulv arxivBtry1/host/* arxivBtry2/host/
> 
> This should, I believe, make hardlinks into arxivBtry2/host/ for any
> plain file that is present in arxivBtry1/host/ if a newer version of
> that file is not already present in arxivBtry2/host/. And, also I
> think that if I interrupt this statement and restart it, it should do
> nothing to the hardlinks it has already inserted in arxivBtry2/host/
> silently.  But when I try this resume operation I get a long list of
> reports of removing files from arxivBtry2/host/. Why? Examination of
> arxivBtry2/host/, using ls -la indicates that the file in arxivBtry2/host/
> that was reported removed is still there, so the removal reports seem
> to be false reports.
> 
> More details about the environment:
> 
> Both arxivBtry1/host/ and arxivBtry2/host/ are directories on an
> external harddisk that has 3 TeraB capacity and is half full. This ls
> output:
> 
> root@big:/media/gfx2/hostmrg2# ls -ls
> total 44
> 4 drwxr-xr-x 3 root root 4096 20140701_144028 arxivAtry1
> 4 drwxr-xr-x 3 root root 4096 20140630_185519 arxivBtry1
> 4 drwxr-xr-x 3 root root 4096 20140705_105447 arxivBtry2
> 4 drwxr-xr-x 3 root root 4096 20140702_071706 glb2try1
> 4 drwxr-xr-x 3 root root 4096 20140701_154330 glbltry1
> 4 drwxr-xr-x 3 root root 4096 20140701_150432 mrg4try1
> 4 drwx------ 3 root root 4096 20140705_102058 sgt1fxd
> 4 drwxr-xr-x 3 root root 4096 20140702_215246 sgt1xxx
> 4 drwxr-xr-x 3 root root 4096 20140701_144837 wdp71try1
> 4 drwxr-xr-x 3 root root 4096 20140701_123858 wdp7vtry1
> 4 drwxr-xr-x 3 root root 4096 20140630_231448 wdp8try1
> root@big:/media/gfx2/hostmrg2# 
> 
> The other lines in this listing are other directories
> each of which also has a sub-directory named 'host'.
> Once I understand what's going on, I intend to merge
> them into arxivBtry2/host/, also.
> 
> I'd be happy to call this behavior a feature, not a
> bug, if it is already known to you and known to 
> cause not harm to the actual merge of the plain files
> of the two structures into one structure. 
> 
> Thanks for your help,

This sounds similar to the redundant link recreation issue at:
http://bugs.debian.org/752892
I've yet to look into these.

thanks,
P�draig.

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retitle 17963 cp: strange behavior (possibly redundant link recreation)

Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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