[Lxr-dev] [ lxr-Bugs-3581487 ] genxref crash while reading configuration

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Bugs item #3581487, was opened at 2012-10-28 19:21
Message generated for change (Comment added) made by oliwer_
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Category: genxref
Group: v1.0
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Olivier Duclos (oliwer_)
Assigned to: Nobody/Anonymous (nobody)
Summary: genxref crash while reading configuration

Initial Comment:
When launching genxref with the command './genxref --url=http://lxr.domain.com --allversions' I get the following error:

No matching configuration at ./genxref line 312, <FILETYPE> line 1.

I tried to track down the error and found this a few lines above :

if ($option{'url'}) {   # Single 'url'
        @config = (1);          # Fake list to prevent looping
}

This may prevent looping but the rest of the script needed the data in @config. I tried commenting this passage, but then the script exits without any error and without having generating the database files!

This was on Debian Squeeze with Perl 5.10.1.

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>Comment By: Olivier Duclos (oliwer_)
Date: 2012-10-29 12:44

Message:
Thanks! You're diagnostic was right but incomplete.

After modifying the regex at line 248, the script continued ($hits == 1
before the test), but I still got the error "Can't find the config
for...".

So I continued debugging. A few lines down there is this test to match URLs
:

if      (       $host eq $rt
                &&      $script_path eq $virtroot
        )

Here are the values of the variables just be fore the test :

HOST=http://lxr.sleepycat.fr
RT=lxr.sleepycat.fr
SCRIPT_PATH=/
VIRTROOT=

So the test failed. To fix the value of $rt, I just prefixed my host_names
with '//' in lxr.conf. I guess this is my fault because the doc says you
need to put // or http:// when entering a hostname. (But then it's not a
hostname anymore!)

I wasn't sure how to fix the value of $script_path as there are several
regex involved. I ended up adding this line after line 232 :

 $script_path = '' if ($script_path eq '/');

Now all the values match! My sources are being indexed as I write...

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Comment By: Andre-Littoz (ajlittoz)
Date: 2012-10-29 09:25

Message:
I must admit this is the only case I haven't tested in depth.

Though I'm rather busy professionally speaking, I may have found something
in in Config.pm sub _initialize. Target URL is first split into components
host and script path. Unhappily, this process assumes there is always a
script path after the hostname. If there is none, the regexp captures
nothing and the internal hostname is EMPTY. Consequently, this internal
host name never matches any in 'host_names'.

If you have more time than me, try the following:
in Config.pm, change line 248 from

       $hits += $virtroot =~ s!^/+!/!;     # and a single starting /

to

       $hits += $virtroot =~ s!^/*!/!;     # and a single starting /
(replace + by * inside regexp)

Explanation: your 'virtroot' contains an empty string and at least a path
separator is needed to build the URL path up to the script name.

Then try the following command:
./genxref --url=//lxr.domain.com/ --alversions

i.e. add a trailing / to your URL.

If it works, it will confirm the diagnostic and I'll design something clean
to cover this case.

Please report back.

----------------------------------------------------------------------

Comment By: Olivier Duclos (oliwer_)
Date: 2012-10-29 07:02

Message:
Thanks for your quick reply.

I should have started from the beginning. My lxr.conf contains this:

'host_names' =>       [ 'lxr.sleepycat.fr' ]
'virtroot'    => ''

When I launch ./genxref --url=//lxr.sleepycat.fr --allversions   I get
this:
Can't find config for http://lxr.sleepycat.fr/: ...

I tried adding 'http://' in the hostname and putting '/' in virtroot but it
doesn't change anything. Then I added this line to lxr.conf : 

, 'baseurl' => 'http://lxr.sleepycat.fr'

and it got me to the problem mentioned above. I'm stuck!

----------------------------------------------------------------------

Comment By: Andre-Littoz (ajlittoz)
Date: 2012-10-29 02:51

Message:
Hi,

Your analysis is wrong: inside the loop, access to data in @config (aka.
through variable $treedescr) is protected by another "if ($option("url"))"
to discriminate between single and multiple URL indexing. It should work as
is.

Check that your --url argument is correct. As I read it, it only contains
the target hostname, i.e. without 'virtroot'. The genxref line should read
something like:

./genxref --url=http://lxr.domain.com/virtroot --allversions

unless, of course, your 'virtroot' is only '/', meaning the host only
contains a single LXR tree (without any other page).

If you forgot nothing, send your lxr.conf.

Regards,
ajl

----------------------------------------------------------------------

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