bugGNU Wget - Bugs: bug #45037, wget -O foo...

 
 

bug #45037: wget -O foo ftp://ftp.funet.fi/pub/Linux/mirrors/debian/README deletes README symlink

Submitter:  Noël Köthe <nok>
Submitted:  Wed 06 May 2015 01:36:34 PM UTC
   
 
Category:  Program Logic Severity:  3 - Normal
Priority:  5 - Normal Status:  Confirmed
Privacy:  Public Assigned to:  None
Originator Name:  Open/Closed:  Open
Release:  1.16.3 Operating System:  GNU/Linux
Reproducibility:  Every Time Fixed Release:  None
Planned Release:  None Regression:  None
Work Required:  None Patch Included:  No
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Wed 06 May 2015 10:34:13 PM UTC, comment #3: 

It's clearly a bug. If we are downloading README to local file foo, there's no reason to remove the local symlink README.

When we want to save into a name where there's currently a symlink, consistency with shell > would dictate just to follow the link on writing, but as that may lead to security issues, replacing with a file may also be acceptable.

Ángel <angel_>
Wed 06 May 2015 07:10:15 PM UTC, comment #2: 

Use -d to get
Unlinking README (symlink).

In ftp.c you will find those lines:
  /* Remove it if it's a link.  */
  remove_link (con->target);

This is done by purpose (I just can guess why: not to overwrite the content the link points to).

The question is: is it a bug or a feature ? Should we just document this behaviour (maybe it already is).

Tim Ruehsen <rockdaboot>
Group administrator
Wed 06 May 2015 04:30:34 PM UTC, comment #1: 

slightly related bug..

$ ln -s /etc/passwd README

$ wget  -O README http://foo.bar
README: Permission denied

Giuseppe Scrivano <gscrivano>
Group administrator
Wed 06 May 2015 01:36:34 PM UTC, original submission:  

Hello,

a forwarded bug report which is reproducible:

https://bugs.debian.org/784348

--8<--
joey@darkstar:~/tmp/y>ln -s /etc/passwd README
joey@darkstar:~/tmp/y>ls
README@
joey@darkstar:~/tmp/y>wget -O foo ftp://ftp.funet.fi/pub/Linux/mirrors/debian/README
--2015-05-05 13:17:22--  ftp://ftp.funet.fi/pub/Linux/mirrors/debian/README
           => ‘foo’
Resolving ftp.funet.fi (ftp.funet.fi)... 193.166.3.2, 2001:708:10:9::20:2
Connecting to ftp.funet.fi (ftp.funet.fi)|193.166.3.2|:21... connected.
Logging in as anonymous ... Logged in!
==> SYST ... done.    ==> PWD ... done.
==> TYPE I ... done.  ==> CWD (1) /pub/Linux/mirrors/debian ... done.
==> SIZE README ... 1495
==> PASV ... done.    ==> RETR README ... done.
Length: 1495 (1.5K) (unauthoritative)

README              100%[=====================>]   1.46K  5.45KB/s   in 0.3s  

2015-05-05 13:17:28 (5.45 KB/s) - ‘foo’ saved [1495]

joey@darkstar:~/tmp/y>ls
foo

Doesn't happen if README is a file rather than a symlink, doesn't happen when using http. The ftp downloader apparently has a bug..
--8<--


Noël Köthe <nok>

 

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  • -email is unavailable- added by angel_ (Posted a comment)
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  • -email is unavailable- added by gscrivano (Posted a comment)
  • -email is unavailable- added by darnir (Updated the item)
  • -email is unavailable- added by nok (Submitted the item)
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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2015-05-06 darnir StatusNone Confirmed
    2015-05-06 nok Carbon-Copy- Added -email is unavailable-

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