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Subject: bug#20775: cp -a -u destroys files after they are copied
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Hello,

I found that the cp command acts "sub-optimal" when copying hard-linked
files of the same name from several directories to one target directory, it
first copies the files then removes them. I cannot see how that can be the
intended behaviour. Please fix this.

best regards
     Steffen Zahn

sz@gandalf:~ $ cd /tmp
sz@gandalf:/tmp $ mkdir 1 2 3
sz@gandalf:/tmp $ touch 1/a
sz@gandalf:/tmp $ ln 1/a 2/
sz@gandalf:/tmp $ ls -li 1 2
1:
total 0
262424 -rw-r--r-- 2 sz sz 0 Jun  9 06:10 a

2:
total 0
262424 -rw-r--r-- 2 sz sz 0 Jun  9 06:10 a
sz@gandalf:/tmp $ cp -a -u --verbose 1/* 2/* 3/
'1/a' -> '3/a'
removed '3/a'
cp: cannot create hard link '3/a' to '3/a': No such file or directory
sz@gandalf:/tmp $ cp --version
cp (GNU coreutils) 8.21
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Torbjorn Granlund, David MacKenzie, and Jim Meyering.
sz@gandalf:/tmp $ ls -la 3/
total 8
drwxr-xr-x  2 sz   sz   4096 Jun  9 06:11 .
drwxrwxrwt 13 root root 4096 Jun  9 06:11 ..
sz@gandalf:/tmp $ uname -a
Linux gandalf 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux

--089e0118366ef58ee005180e0d6f
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr"><div><font color=3D"#000000" face=3D"Times New Roman" size=
=3D"3"><span style=3D"line-height:normal">Hello,</span></font></div><div><f=
ont color=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=3D"li=
ne-height:normal"><br></span></font></div><div>I found that the cp command =
acts &quot;sub-optimal&quot; when copying hard-linked files of the same nam=
e from several directories to one target directory, it first copies the fil=
es then removes them. I cannot see how that can be the intended behaviour. =
Please fix this.</div><div><br></div><div>best regards</div><div>=C2=A0 =C2=
=A0 =C2=A0Steffen Zahn</div><div><font color=3D"#000000" face=3D"Times New =
Roman" size=3D"3"><span style=3D"line-height:normal"><br></span></font></di=
v><div><font color=3D"#000000" face=3D"Times New Roman" size=3D"3"><span st=
yle=3D"line-height:normal">sz@gandalf:~ $ cd /tmp</span></font></div><div><=
font color=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=3D"l=
ine-height:normal">sz@gandalf:/tmp $ mkdir 1 2 3</span></font></div><div><f=
ont color=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=3D"li=
ne-height:normal">sz@gandalf:/tmp $ touch 1/a</span></font></div><div><font=
 color=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=3D"line-=
height:normal">sz@gandalf:/tmp $ ln 1/a 2/</span></font></div><div><font co=
lor=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=3D"line-hei=
ght:normal">sz@gandalf:/tmp $ ls -li 1 2</span></font></div><div><font colo=
r=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=3D"line-heigh=
t:normal">1:</span></font></div><div><font color=3D"#000000" face=3D"Times =
New Roman" size=3D"3"><span style=3D"line-height:normal">total 0</span></fo=
nt></div><div><font color=3D"#000000" face=3D"Times New Roman" size=3D"3"><=
span style=3D"line-height:normal">262424 -rw-r--r-- 2 sz sz 0 Jun =C2=A09 0=
6:10 a</span></font></div><div><font color=3D"#000000" face=3D"Times New Ro=
man" size=3D"3"><span style=3D"line-height:normal"><br></span></font></div>=
<div><font color=3D"#000000" face=3D"Times New Roman" size=3D"3"><span styl=
e=3D"line-height:normal">2:</span></font></div><div><font color=3D"#000000"=
 face=3D"Times New Roman" size=3D"3"><span style=3D"line-height:normal">tot=
al 0</span></font></div><div><font color=3D"#000000" face=3D"Times New Roma=
n" size=3D"3"><span style=3D"line-height:normal">262424 -rw-r--r-- 2 sz sz =
0 Jun =C2=A09 06:10 a</span></font></div><div><font color=3D"#000000" face=
=3D"Times New Roman" size=3D"3"><span style=3D"line-height:normal">sz@ganda=
lf:/tmp $ cp -a -u --verbose 1/* 2/* 3/</span></font></div><div><font color=
=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=3D"line-height=
:normal">&#39;1/a&#39; -&gt; &#39;3/a&#39;</span></font></div><div><font co=
lor=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=3D"line-hei=
ght:normal">removed &#39;3/a&#39;</span></font></div><div><font color=3D"#0=
00000" face=3D"Times New Roman" size=3D"3"><span style=3D"line-height:norma=
l">cp: cannot create hard link &#39;3/a&#39; to &#39;3/a&#39;: No such file=
 or directory</span></font></div><div><font color=3D"#000000" face=3D"Times=
 New Roman" size=3D"3"><span style=3D"line-height:normal">sz@gandalf:/tmp $=
 cp --version</span></font></div><div><font color=3D"#000000" face=3D"Times=
 New Roman" size=3D"3"><span style=3D"line-height:normal">cp (GNU coreutils=
) 8.21</span></font></div><div><font color=3D"#000000" face=3D"Times New Ro=
man" size=3D"3"><span style=3D"line-height:normal">Copyright (C) 2013 Free =
Software Foundation, Inc.</span></font></div><div><font color=3D"#000000" f=
ace=3D"Times New Roman" size=3D"3"><span style=3D"line-height:normal">Licen=
se GPLv3+: GNU GPL version 3 or later &lt;<a href=3D"http://gnu.org/license=
s/gpl.html">http://gnu.org/licenses/gpl.html</a>&gt;.</span></font></div><d=
iv><font color=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=
=3D"line-height:normal">This is free software: you are free to change and r=
edistribute it.</span></font></div><div><font color=3D"#000000" face=3D"Tim=
es New Roman" size=3D"3"><span style=3D"line-height:normal">There is NO WAR=
RANTY, to the extent permitted by law.</span></font></div><div><font color=
=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=3D"line-height=
:normal"><br></span></font></div><div><font color=3D"#000000" face=3D"Times=
 New Roman" size=3D"3"><span style=3D"line-height:normal">Written by Torbjo=
rn Granlund, David MacKenzie, and Jim Meyering.</span></font></div><div><fo=
nt color=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=3D"lin=
e-height:normal">sz@gandalf:/tmp $ ls -la 3/</span></font></div><div><font =
color=3D"#000000" face=3D"Times New Roman" size=3D"3"><span style=3D"line-h=
eight:normal">total 8</span></font></div><div><font color=3D"#000000" face=
=3D"Times New Roman" size=3D"3"><span style=3D"line-height:normal">drwxr-xr=
-x =C2=A02 sz =C2=A0 sz =C2=A0 4096 Jun =C2=A09 06:11 .</span></font></div>=
<div><font color=3D"#000000" face=3D"Times New Roman" size=3D"3"><span styl=
e=3D"line-height:normal">drwxrwxrwt 13 root root 4096 Jun =C2=A09 06:11 ..<=
/span></font></div><div>sz@gandalf:/tmp $ uname -a<br></div><div><div>Linux=
 gandalf 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_6=
4 x86_64 x86_64 GNU/Linux</div></div><div><br></div></div>

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To: Steffen Zahn <steffzahn@HIDDEN>
Subject: bug#20775: Acknowledgement (cp -a -u destroys files after they
 are copied)
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Subject: bug#20775: cp -a -u destroys files after they are copied
Resent-From: "L. A. Walsh" <coreutils@HIDDEN>
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Date: Tue, 30 Jun 2015 00:02:51 -0700
From: "L. A. Walsh" <coreutils@HIDDEN>
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I think you'll find this was reported 3 years ago..

     "bug#10471: Severe or critical - deletes existing files and leaves 
nothing. (cp)"
https://lists.gnu.org/archive/html/bug-coreutils/2015-04/msg00001.html

Unfortunately it was closed it out w/the reason that  it was a 
"cygwin/windows-only"
-- which I disagreed with.  I was told the cygwin dev would check it out and
if it was in coreutils would move it back to active status (that was 3+ 
years ago).

On 6/8/2015 9:18 PM, Steffen Zahn wrote:
> Hello,
>
> I found that the cp command acts "sub-optimal" when copying 
> hard-linked files of the same name from several directories to one 
> target directory, it first copies the files then removes them. I 
> cannot see how that can be the intended behaviour. Please fix this.
>
> best regards
>      Steffen Zahn
>
> sz@gandalf:~ $ cd /tmp
> sz@gandalf:/tmp $ mkdir 1 2 3
> sz@gandalf:/tmp $ touch 1/a
> sz@gandalf:/tmp $ ln 1/a 2/
> sz@gandalf:/tmp $ ls -li 1 2
> 1:
> total 0
> 262424 -rw-r--r-- 2 sz sz 0 Jun  9 06:10 a
>
> 2:
> total 0
> 262424 -rw-r--r-- 2 sz sz 0 Jun  9 06:10 a
> sz@gandalf:/tmp $ cp -a -u --verbose 1/* 2/* 3/
> '1/a' -> '3/a'
> removed '3/a'
> cp: cannot create hard link '3/a' to '3/a': No such file or directory
> sz@gandalf:/tmp $ cp --version
>

Message sent to bug-coreutils@HIDDEN:

Subject: bug#20775: cp -a -u destroys files after they are copied
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From: Steffen Zahn <steffzahn@HIDDEN>
Date: Tue, 30 Jun 2015 08:35:36 +0000
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--001a11c25cc6db8d0d0519b8177a
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Hello,

the bug was observed on Linux this time. Unfortunately I was hit with the
bug when backing up several large photo directories with hard-links to one
target directory on an external drive. So it was not obvious for me at
first, that something was going wrong.

From my point of view (without looking at the source) it should be easy to
repair by

- not attempting to create a hard-link from a file to itself
- not deleting a file that is about to be used as the source paramter of a
hard-link to be created.


best regards
  Steffen Zahn



On Tue, Jun 30, 2015 at 9:02 AM L. A. Walsh <coreutils@HIDDEN> wrote:

> I think you'll find this was reported 3 years ago..
>
>      "bug#10471: Severe or critical - deletes existing files and leaves
> nothing. (cp)"
> https://lists.gnu.org/archive/html/bug-coreutils/2015-04/msg00001.html
>
> Unfortunately it was closed it out w/the reason that  it was a
> "cygwin/windows-only"
> -- which I disagreed with.  I was told the cygwin dev would check it out
> and
> if it was in coreutils would move it back to active status (that was 3+
> years ago).
>
> On 6/8/2015 9:18 PM, Steffen Zahn wrote:
> > Hello,
> >
> > I found that the cp command acts "sub-optimal" when copying
> > hard-linked files of the same name from several directories to one
> > target directory, it first copies the files then removes them. I
> > cannot see how that can be the intended behaviour. Please fix this.
> >
> > best regards
> >      Steffen Zahn
> >
> > sz@gandalf:~ $ cd /tmp
> > sz@gandalf:/tmp $ mkdir 1 2 3
> > sz@gandalf:/tmp $ touch 1/a
> > sz@gandalf:/tmp $ ln 1/a 2/
> > sz@gandalf:/tmp $ ls -li 1 2
> > 1:
> > total 0
> > 262424 -rw-r--r-- 2 sz sz 0 Jun  9 06:10 a
> >
> > 2:
> > total 0
> > 262424 -rw-r--r-- 2 sz sz 0 Jun  9 06:10 a
> > sz@gandalf:/tmp $ cp -a -u --verbose 1/* 2/* 3/
> > '1/a' -> '3/a'
> > removed '3/a'
> > cp: cannot create hard link '3/a' to '3/a': No such file or directory
> > sz@gandalf:/tmp $ cp --version
> >
>
>

--001a11c25cc6db8d0d0519b8177a
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<div dir=3D"ltr">Hello,<div><br></div><div>the bug was observed on Linux th=
is time. Unfortunately I was hit with the bug when backing up several large=
 photo directories with hard-links to one target directory on an external d=
rive. So it was not obvious for me at first, that something was going wrong=
.</div><div><br></div><div>From my point of view (without looking at the so=
urce) it should be easy to repair by=C2=A0</div><div><br></div><div>- not a=
ttempting to create a hard-link from a file to itself</div><div>- not delet=
ing a file that is about to be used as the source paramter of a hard-link t=
o be created.</div><div><br></div><div><br></div><div>best regards</div><di=
v>=C2=A0 Steffen Zahn</div><div><br></div><div><br></div></div><br><div cla=
ss=3D"gmail_quote"><div dir=3D"ltr">On Tue, Jun 30, 2015 at 9:02 AM L. A. W=
alsh &lt;<a href=3D"mailto:coreutils@HIDDEN">coreutils@HIDDEN</a>&gt;=
 wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex">I think you&#39;ll find thi=
s was reported 3 years ago..<br>
<br>
=C2=A0 =C2=A0 =C2=A0&quot;bug#10471: Severe or critical - deletes existing =
files and leaves<br>
nothing. (cp)&quot;<br>
<a href=3D"https://lists.gnu.org/archive/html/bug-coreutils/2015-04/msg0000=
1.html" rel=3D"noreferrer" target=3D"_blank">https://lists.gnu.org/archive/=
html/bug-coreutils/2015-04/msg00001.html</a><br>
<br>
Unfortunately it was closed it out w/the reason that=C2=A0 it was a<br>
&quot;cygwin/windows-only&quot;<br>
-- which I disagreed with.=C2=A0 I was told the cygwin dev would check it o=
ut and<br>
if it was in coreutils would move it back to active status (that was 3+<br>
years ago).<br>
<br>
On 6/8/2015 9:18 PM, Steffen Zahn wrote:<br>
&gt; Hello,<br>
&gt;<br>
&gt; I found that the cp command acts &quot;sub-optimal&quot; when copying<=
br>
&gt; hard-linked files of the same name from several directories to one<br>
&gt; target directory, it first copies the files then removes them. I<br>
&gt; cannot see how that can be the intended behaviour. Please fix this.<br=
>
&gt;<br>
&gt; best regards<br>
&gt;=C2=A0 =C2=A0 =C2=A0 Steffen Zahn<br>
&gt;<br>
&gt; sz@gandalf:~ $ cd /tmp<br>
&gt; sz@gandalf:/tmp $ mkdir 1 2 3<br>
&gt; sz@gandalf:/tmp $ touch 1/a<br>
&gt; sz@gandalf:/tmp $ ln 1/a 2/<br>
&gt; sz@gandalf:/tmp $ ls -li 1 2<br>
&gt; 1:<br>
&gt; total 0<br>
&gt; 262424 -rw-r--r-- 2 sz sz 0 Jun=C2=A0 9 06:10 a<br>
&gt;<br>
&gt; 2:<br>
&gt; total 0<br>
&gt; 262424 -rw-r--r-- 2 sz sz 0 Jun=C2=A0 9 06:10 a<br>
&gt; sz@gandalf:/tmp $ cp -a -u --verbose 1/* 2/* 3/<br>
&gt; &#39;1/a&#39; -&gt; &#39;3/a&#39;<br>
&gt; removed &#39;3/a&#39;<br>
&gt; cp: cannot create hard link &#39;3/a&#39; to &#39;3/a&#39;: No such fi=
le or directory<br>
&gt; sz@gandalf:/tmp $ cp --version<br>
&gt;<br>
<br>
</blockquote></div>

--001a11c25cc6db8d0d0519b8177a--

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Steffen Zahn wrote:
> it should be easy to repair

Really?  Without significantly affecting performance in the usual case?  Let's 
see a patch.

Message sent to bug-coreutils@HIDDEN:

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severity 20775 wishlist
retitle 20775 cp: improve hardlink dups handling with "cp -a -u"
stop

With no further comments in more than 3 years,
I'm marking this as a "wish list" item.

-assaf

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Subject: Re: bug#20775: cp -a -u destroys files after they are copied
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severity 20775 wishlist
retitle 20775 cp: improve hardlink dups handling with "cp -a -u"
stop

With no further comments in more than 3 years,
I'm marking this as a "wish list" item.

-assaf

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Subject: Re: bug#20775: cp -a -u destroys files after they are copied
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severity 20775 wishlist
retitle 20775 cp: improve hardlink dups handling with "cp -a -u"
stop

With no further comments in more than 3 years,
I'm marking this as a "wish list" item.

-assaf

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