GNU logs - #28341, boring messages

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Subject: bug#28341: RFE: focusing on source vs. symptoms (reducing duplicate error ouput)
Resent-From: L A Walsh <coreutils@HIDDEN>
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Date: Sun, 03 Sep 2017 15:06:49 -0700
From: L A Walsh <coreutils@HIDDEN>
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(Originally posted w/2 separable issues merged: splitting.)
=20
In copying to a directory from a file system that has no unix
permission bits (from one that does), one gets many duplicate
error messages.  Ex, copying from from a standard linux file
system to a VFAT FS, cp reported:
=20
>  cp -a Valkyrja /l/
cp: preserving permissions for =E2=80=98/l/Valkyrja/folder.jpg=E2=80=99: =
Not supported
cp: preserving permissions for =E2=80=98/l/Valkyrja/01 Valkyrja(=E3=83=B4=
=E3=82=A1=E3=83=AB=E3=82=AD=E3=83=AA=E3=82=A2).=20
flac=E2=80=99: Not supported
cp: preserving permissions for =E2=80=98/l/Valkyrja/02 =E5=A6=96=E7=B2=BE=
=E5=B8=9D=E5=9C=8B.flac=E2=80=99: Not=20
supported
cp: preserving permissions for =E2=80=98/l/Valkyrja/Scans/mo07.jpg=E2=80=99=
: Not supported
cp: preserving permissions for =E2=80=98/l/Valkyrja/Scans/mo05.jpg=E2=80=99=
: Not supported
cp: preserving permissions for =E2=80=98/l/Valkyrja/Scans/mo06.jpg=E2=80=99=
: Not supported
cp: preserving permissions for =E2=80=98/l/Valkyrja/Scans/mo01.jpg=E2=80=99=
: Not supported
...

If Target file system doesn't support preserving permissions,
it would be more useful to issue 1 error message for the
_source_ of the problem (the directory) than 100's to 1000's of messages
for each failure (symptoms of problem).  Maybe
something along the lines of (w/optional clarification in parens):

>  cp -a Valkyrja /l/
cp: preserving permissions for destination '/l/': Not supported.
    (per-file permissions-Not-supported messages suppressed)

Thanks...
linda

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To: L A Walsh <coreutils@HIDDEN>
Subject: bug#28341: Acknowledgement (RFE: focusing on source vs. symptoms
 (reducing duplicate error ouput))
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Subject: bug#28341: RFE: focusing on source vs. symptoms (reducing duplicate error ouput)
Resent-From: Paul Eggert <eggert@HIDDEN>
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L A Walsh wrote:
> If Target file system doesn't support preserving permissions,
> it would be more useful to issue 1 error message for the
> _source_ of the problem (the directory)

That would be more useful in some circumstances. However, I expect some people 
are used to the longstanding behavior, which is more in line with what POSIX 
requires. We could add an option to supress chatter, though.

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