GNU logs - #13635, boring messages

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Subject: bug#13635: Strange ls bug (Combination of -a and --color)
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Hi,

I'm using 'ls' and I'm encountering a pretty strange bug.

I just rsync'd my remote server for backup, and on my local machine I
run the command 'ls -lh csf/'
Well.. Here's the result;

$ ls -lh csf/
ls: cannot access csf/.: Permission denied
ls: cannot access csf/..: Permission denied
total 0
d????????? ? ? ? ?                ? .
d????????? ? ? ? ?                ? ..


running just 'ls csf/'
$ ls csf/
ls: cannot access csf/.: Permission denied
ls: cannot access csf/..: Permission denied
=2E  ..


It appears to be outputting the information, even though it should be
exiting after it says permission denied.

I've tried rm -rf csf/ and re-rsyncing it, but the problem persists.


My .bashrc;
    alias ls=3D'ls -aC --color=3Dauto'


Running '/bin/ls csf/'
just results in a newline.

running '/bin/ls -aC' doesn't cause the error, neither does '/bin/ls -C
--color=3Dauto csf/'
But, '/bin/ls -a --color=3Dauto csf/' DOES.
So it seems to be the combination of --color and -a.

Thanks


--=20
*Joshua Rogers* - Retro Game Collector && IT Security Specialist
gpg pubkey <http://www.internot.info/docs/gpg_pubkey.asc.gpg>

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    Hi,<br>
    <br>
    I'm using 'ls' and I'm encountering a pretty strange bug.<br>
    <br>
    I just rsync'd my remote server for backup, and on my local machine
    I run the command 'ls -lh csf/'<br>
    Well.. Here's the result;<br>
    <br>
    $ ls -lh csf/<br>
    ls: cannot access csf/.: Permission denied<br>
    ls: cannot access csf/..: Permission denied<br>
    total 0<br>
    d????????? ? ? ? ?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ? .<br>
    d????????? ? ? ? ?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ? ..<br>
    <br>
    <br>
    running just 'ls csf/'<br>
    $ ls csf/<br>
    ls: cannot access csf/.: Permission denied<br>
    ls: cannot access csf/..: Permission denied<br>
    .&nbsp; ..<br>
    <br>
    <br>
    It appears to be outputting the information, even though it should
    be exiting after it says permission denied.<br>
    <br>
    I've tried rm -rf csf/ and re-rsyncing it, but the problem persists.<br>
    <br>
    <br>
    My .bashrc;<br>
    &nbsp;&nbsp;&nbsp; alias ls='ls -aC --color=auto'<br>
    <br>
    <br>
    Running '/bin/ls csf/'<br>
    just results in a newline.<br>
    <br>
    running '/bin/ls -aC' doesn't cause the error, neither does '/bin/ls
    -C --color=auto csf/'<br>
    But, '/bin/ls -a --color=auto csf/' DOES.<br>
    So it seems to be the combination of --color and -a.<br>
    <br>
    Thanks<br>
    <br>
    <br>
    <div class="moz-signature">-- <br>
      <b>Joshua Rogers</b> - Retro Game Collector &amp;&amp; IT Security
      Specialist<br>
      <font size="3"><a
          href="http://www.internot.info/docs/gpg_pubkey.asc.gpg">gpg
          pubkey</a></font></div>
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Joshua Rogers <megamansec@HIDDEN>
Subject: bug#13635: Acknowledgement (Strange ls bug (Combination of -a and
 --color))
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Date: Wed, 06 Feb 2013 07:58:03 +0000

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--=20
13635: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D13635
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Message sent to bug-coreutils@HIDDEN:

Subject: bug#13635: Strange ls bug (Combination of -a and --color)
Resent-From: Bob Proulx <bob@HIDDEN>
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Joshua Rogers wrote:
> I just rsync'd my remote server for backup, and on my local machine I
> run the command 'ls -lh csf/'
> Well.. Here's the result;
> 
> $ ls -lh csf/
> ls: cannot access csf/.: Permission denied
> ls: cannot access csf/..: Permission denied
> total 0
> d????????? ? ? ? ?                ? .
> d????????? ? ? ? ?                ? ..

What is the output of (without the trailing slash and with -d):

  ls -ld csf

I suspect that you are missing the 'x' search permission bit but have
the 'r' bit.  You can read the directory but cannot search it.  To fix
this add the 'x' bit back to the directory.  If it is a directory.

  chmod a+x csf

Bob

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Subject: bug#13635: Strange ls bug (Combination of -a and --color)
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Date: Wed, 06 Feb 2013 19:10:47 +1100
From: Joshua Rogers <megamansec@HIDDEN>
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Hi Bob,

Here is the result of that command;

$ ls -ld csf
drw------- 2 toil toil 4096 2013-02-05 19:26 csf


The result of running it with the trailing / aswell;
$ ls -ld csf/
drw------- 2 toil toil 4096 2013-02-05 19:26 csf/


So it seems that you may be correct.
That chmod fixes the problem, But it is still a bug that it does not
exit if it does have permissions, and has color on.


Thanks
*Joshua Rogers* - Retro Game Collector && IT Security Specialist
gpg pubkey <http://www.internot.info/docs/gpg_pubkey.asc.gpg>
On 06/02/13 19:07, Bob Proulx wrote:
>   ls -ld csf


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    <div class="moz-cite-prefix">Hi Bob,<br>
      <br>
      Here is the result of that command;<br>
      <br>
      $ ls -ld csf<br>
      drw------- 2 toil toil 4096 2013-02-05 19:26 csf<br>
      <br>
      <br>
      The result of running it with the trailing / aswell;<br>
      $ ls -ld csf/<br>
      drw------- 2 toil toil 4096 2013-02-05 19:26 csf/<br>
      <br>
      <br>
      So it seems that you may be correct.<br>
      That chmod fixes the problem, But it is still a bug that it does
      not exit if it does have permissions, and has color on.<br>
      <br>
      <br>
      Thanks<br>
      <div class="moz-signature"><b>Joshua Rogers</b> - Retro Game
        Collector &amp;&amp; IT Security Specialist<br>
        <font size="3"><a
            href="http://www.internot.info/docs/gpg_pubkey.asc.gpg">gpg
            pubkey</a></font></div>
      On 06/02/13 19:07, Bob Proulx wrote:<br>
    </div>
    <blockquote cite="mid:20130206080700.GA8110@HIDDEN"
      type="cite">
      <pre wrap="">  ls -ld csf</pre>
    </blockquote>
    <br>
  </body>
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Joshua Rogers wrote:
> $ ls -ld csf
> drw------- 2 toil toil 4096 2013-02-05 19:26 csf

Yes. :-)

> So it seems that you may be correct.
> That chmod fixes the problem,

Yes.  You said you rsync'd data from another machine.  Was the
permissions copied from the remote machine the same there?

> But it is still a bug that it does not exit if it does have
> permissions, and has color on.

Sorry but I don't understand what you are saying.  The ls command
didn't create the directory with that permission.  The ls command
simply reported it.  That isn't a bug in ls.  And I am sure not a bug
in rsync either since I am sure that rsync just copied the source
permissions directly.  I think this is all expected behavior.

If either --color or -l is specified then it will cause ls to need to
stat(2) each entry in order to get information about it.  But it can't
stat without the 'x' bit allowing it.  So it reports what it can which
is simply the file name and nothing more.  And of course the program
does exit afterward.

Using 'ls -l' reports both "." and ".." and therefore they are listed
by name but without the missing attributes.  Using 'ls' without -l
does not report "." and ".." and therefore reported nothing but a
newline.

Bob

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Okay, I understand that, but the

"

d????????? ? ? ? ?                ? .
d????????? ? ? ? ?                ? .."

That is a bug, no?


Thanks

*Joshua Rogers* - Retro Game Collector && IT Security Specialist
gpg pubkey <http://www.internot.info/docs/gpg_pubkey.asc.gpg>

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    -----BEGIN PGP SIGNED MESSAGE-----<br>
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    <br>
    Okay, I understand that, but the<br>
    <br>
    "<br>
    <br>
    d????????? ? ? ? ?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ? .<br>
    d????????? ? ? ? ?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ? .."<br>
    <br>
    That is a bug, no?<br>
    <br>
    <br>
    Thanks<br>
    <br>
    *Joshua Rogers* - Retro Game Collector &amp;&amp; IT Security
    Specialist<br>
    gpg pubkey <a class="moz-txt-link-rfc2396E" href="http://www.internot.info/docs/gpg_pubkey.asc.gpg">&lt;http://www.internot.info/docs/gpg_pubkey.asc.gpg&gt;</a><br>
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Message sent to bug-coreutils@HIDDEN:

X-Loop: help-debbugs@HIDDEN
Subject: bug#13635: Strange ls bug (Combination of -a and --color)
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Joshua Rogers wrote:
> Okay, I understand that, but the
>=20
> "
>=20
> d????????? ? ? ? ?                ? .
> d????????? ? ? ? ?                ? .."
>=20
> That is a bug, no?

No it isn't.  Since ls didn't have permission to search the directory
it could not stat those files and therefore could not report any
information aout them.  The long format was specified using -l and
therefore the missing columns were filled in with '?'.

If the above was all there was printed then that would be a bug.  But
That wasn't all of the output.  Let me reproduce it including the
important part.

  $ ls -lh csf/
  ls: cannot access csf/.: Permission denied
  ls: cannot access csf/..: Permission denied
  total 0
  d??? ? ? ? ?                ? .
  d??? ? ? ? ?                ? ..

Specifically these lines:

  ls: cannot access csf/.: Permission denied
  ls: cannot access csf/..: Permission denied

That is an error message printed by ls that it did not have the
permission it needed.  It can read their names but it can't find any
stat information about them such as file mode, owner, group, size or
timestamp.  It printed an error message to stderr.  It then gave the
listing with the information it had available.

Also if you were to check the exit code of ls you would find that it
exited with a non-zero exit code indicating that an error occured.

  echo $?
  1

As long as that isn't asked to be printed then it is okay without
knowing those things.  But when asked with any of -l or --color or -a
then it tries to get information about those files, fails, prints the
error message, and exits non-zero.

The ls program has printed an error message where appropriate and has
exited with an error when appropriate.  I see no bug there.  Plus it
has been this way for forty years.  I wouldn't want to change this
core behavior now without a very good reason to do so.

I think the part you are having trouble with is the separation of
permission between 'r' and 'x'.  The 'r' allows reading the names of
the files.  The 'x' allows "searching" which in this case means being
able to stat(2) the file.

  man 2 stat

       These functions return information about a file.  No
       permissions are required on the file itself, but=E2=80=94in the ca=
se of
       stat() and lstat() =E2=80=94 execute (search) permission is requir=
ed on
       all of the directories in path that lead to the file.

And so we see that some actions need 'r' and some need 'x'.  I don't
know why the permissions were split this way.  But they were and so
they continue to be because changing long established behavior is very
disruptive.

Bob

Message sent to bug-coreutils@HIDDEN:

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Subject: bug#13635: Strange ls bug (Combination of -a and --color)
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My guess is that 'csf' is readable but not searchable.
That would explain your symptoms:

$ ls -ld csf
dr--------. 2 eggert eggert 4096 Feb  6 15:31 csf
$ ls -ld csf/.
ls: cannot access csf/.: Permission denied
$ ls --color=always -a csf
ls: cannot access csf/.: Permission denied
ls: cannot access csf/..: Permission denied
.  ..

In the last example, 'ls' needs to stat csf/. and csf/..
to see whether their permissions are weird (since directories
with weird permissions are given different colors), but
it cannot do so since csf lacks search permission.

One possible fix would be to alter 'ls' so that, if 'ls' cannot
find out about a file, it gives the file an even weirder
color.  That might be more useful than the current behavior.
Is this something you could write?

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

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severity 13635 wishlist
retitle 13635 ls: use different color for unreadable files

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From: Assaf Gordon <assafgordon@HIDDEN>
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 Content preview: severity 13635 wishlist retitle 13635 ls: use different color
 for unreadable files [...] 
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severity 13635 wishlist
retitle 13635 ls: use different color for unreadable files

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

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