GNU logs - #47059, boring messages

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Subject: bug#47059: bug in cp removing destination file when it can't be replaced due to cross-volume linking
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Was trying to save disk space by linking duplicate
files, in a dir.=20
FWIW, my 'cp', is aliased to 'cp --preserve=3Dall'

>  for f in Roboto*.ttf;do
cp -l /usr/share/fonts/TTF/$f .
>  done
cp: cannot create hard link './Roboto-Bold.ttf' to=20
'/usr/share/fonts/TTF/Roboto-Bold.ttf': Invalid cross-device link
cp: cannot create hard link './Roboto-Italic.ttf' to=20
'/usr/share/fonts/TTF/Roboto-Italic.ttf': Invalid cross-device link
cp: cannot create hard link './Roboto-Light.ttf' to=20
'/usr/share/fonts/TTF/Roboto-Light.ttf': Invalid cross-device link
cp: cannot create hard link './Roboto-Medium.ttf' to=20
'/usr/share/fonts/TTF/Roboto-Medium.ttf': Invalid cross-device link
cp: cannot create hard link './Roboto-Regular.ttf' to=20
'/usr/share/fonts/TTF/Roboto-Regular.ttf': Invalid cross-device link
cp: cannot create hard link './RobotoCondensed-Bold.ttf' to=20
'/usr/share/fonts/TTF/RobotoCondensed-Bold.ttf': Invalid cross-device lin=
k
cp: cannot create hard link './RobotoCondensed-Light.ttf' to=20
'/usr/share/fonts/TTF/RobotoCondensed-Light.ttf': Invalid cross-device li=
nk
cp: cannot create hard link './RobotoCondensed-Regular.ttf' to=20
'/usr/share/fonts/TTF/RobotoCondensed-Regular.ttf': Invalid cross-device =

link
cp: cannot create hard link './RobotoSlab-Bold.ttf' to=20
'/usr/share/fonts/TTF/RobotoSlab-Bold.ttf': Invalid cross-device link
cp: cannot create hard link './RobotoSlab-Light.ttf' to=20
'/usr/share/fonts/TTF/RobotoSlab-Light.ttf': Invalid cross-device link
cp: cannot create hard link './RobotoSlab-Regular.ttf' to=20
'/usr/share/fonts/TTF/RobotoSlab-Regular.ttf': Invalid cross-device link
cp: cannot create hard link './RobotoSlab-Thin.ttf' to=20
'/usr/share/fonts/TTF/RobotoSlab-Thin.ttf': Invalid cross-device link
----
    Well that didn't work, guess I'll copy over the affected files.

    Repeating command w/o "-l":

Ishtar:=E2=80=A6/3.1.16055.164_0> for f in Roboto*.ttf
do
cp -l /usr/share/fonts/TTF/$f .
done
Ishtar:=E2=80=A6/3.1.16055.164_0> ll Roboto*
ls: cannot access 'Roboto*': No such file or directory
---
Huh?...all of the files were deleted!

That's not good.  When creating a link to a local file, I
first create the link to a temporary name to ensure I have
appropriate access (or that its not cross-linked in this
case).  Apparently 'cp' doesn't exercise the same caution.
It seems 'cp' deletes the target first (as
it was linked to some other file), but then can't
perform the requested copy-link, so leaves the
target location with no file at all.

Um...not good.
Is this fixed in a newer core utils version?
coreutils-8.23-2.3.2.x86_64

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: L A Walsh <coreutils@HIDDEN>
Subject: bug#47059: Acknowledgement (bug in cp removing destination file
 when it can't be replaced due to cross-volume linking)
Message-ID: <handler.47059.B.16154124842889.ack <at> debbugs.gnu.org>
References: <60493CF1.3010209@HIDDEN>
X-Gnu-PR-Message: ack 47059
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Reply-To: 47059 <at> debbugs.gnu.org
Date: Wed, 10 Mar 2021 21:42:01 +0000

Thank you for filing a new bug report with debbugs.gnu.org.

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47059: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D47059
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Subject: bug#47059: (bug in cp removing destination file when it can't be replaced due to cross-volume linking)
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Did anyone see this?  Usually someone says something like
confirming it or asking for more info.

Is this a known bug and/or has it been seen before?

(slightly cleaned up report below)

Thanks!

On 2021/03/10 13:41, L A Walsh wrote:
> Was trying to save disk space by linking duplicate files, in a dir.=20
> FWIW, my 'cp', is aliased to 'cp --preserve=3Dall'
>=20
>>  for f in Roboto*.ttf;do > cp -l /usr/share/fonts/TTF/$f .; done
> cp: cannot create hard link './Roboto-Bold.ttf' to=20
> '/usr/share/fonts/TTF/Roboto-Bold.ttf': Invalid cross-device link
> =E2=80=A6
> cp: cannot create hard link './RobotoSlab-Thin.ttf' to=20
> '/usr/share/fonts/TTF/RobotoSlab-Thin.ttf': Invalid cross-device link
> ----
>     Well that didn't work, guess I'll copy over the affected files.
>
>     Repeating command w/o "-l":
>
> Ishtar:=E2=80=A6/3.1.16055.164_0> for f in Roboto*.ttf; do=20
> cp /usr/share/fonts/TTF/$f . ; done
> cp: cannot access '/usr/share/fonts/TTF/Roboto*.ttf': No such file or d=
irectory
> ---
> Huh?...all of the files were deleted!
>
> That's not good.  When creating a link to a local file, I
> first create the link to a temporary name in the same directory
> to ensure I have appropriate access (or that its not cross-linked
> as in this case).  Apparently 'cp' doesn't exercise the same caution.
> It seems 'cp' deletes the target first (as it was linked to some
> other file), but then can't perform the requested copy-link, so
> leaves the target location with no file at all.
>
> Is this fixed in a newer core utils version?
> coreutils-8.23-2.3.2.x86_64

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merge 47059 47883 48002
thanks

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close 48070

tags 48034 moreinfo
close 48034

unmerge 47883
unmerge 48002

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close 48070

tags 48034 moreinfo
close 48034

unmerge 47883
unmerge 48002

Message sent to bug-coreutils@HIDDEN:


X-Loop: help-debbugs@HIDDEN
Subject: bug#47059: bug in cp removing destination file when it can't be replaced due to cross-volume linking
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I can't reproduce the problem with either coreutils 8.23 or 9.0. 
Unfortunately, the original bug report does not have a recipe for 
reproducing the problem from scratch, without having access to your 
system. If you could come up with the a self-contained way to reproduce 
the problem with current coreutils, that would be helpful.

> When creating a link to a local file, I
> first create the link to a temporary name to ensure I have
> appropriate access (or that its not cross-linked in this
> case).  Apparently 'cp' doesn't exercise the same caution.

Actually, cp -l is even more cautious than the procedure you describe. 
If the destination already exists, cp -l fails without altering the 
destination.

$ echo a >abc
$ echo bb >/tmp/def
$ cp -l abc /tmp/def
cp: cannot create hard link '/tmp/def' to 'abc': File exists
$ ls -l abc /tmp/def
-rw-rw-r-- 1 eggert eggert 3 Feb 21 01:13 /tmp/def
-rw-rw-r-- 1 eggert eggert 2 Feb 21 01:13 abc

Hence the symptoms you reported are mysterious; I don't see how they 
could have happened.

Message received at control <at> debbugs.gnu.org:


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tags 47059 moreinfo
Last modified: Fri, 25 Feb 2022 18:15:02 UTC

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