Re: trouble installing Math::BigInt module

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On 3/31/2014 10:42 PM, Tom Robinson wrote:
> On 01/04/14 16:19, Bennett Haselton wrote:
>> On 3/31/2014 7:56 PM, Tom Robinson wrote:
>>> Can you verify to which packages thefiles belong?
>>>
>>> Try using RPM:
>>>
>>> rpm -qf /usr/lib/perl5/vendor_perl/5.8.8/Net/IP.pm
>> On the old machine:
>> perl-Net-IP-1.25-2.fc6
>>> and
>>>
>>> rpm -qf /usr/lib/perl5/vendor_perl/5.8.8/Crypt/DSA/KeyChain.pm
>> On the new machine:
>> perl-Crypt-DSA-1.16-1.el5.rf
> That should be a good starting point. Your check on installed packages as preposed by John shows two
> very different packaged environments. Did you ever use CPAN on the old or new machine?
Yes, on both.  I needed it because I needed to install Crypt::Twofish 
and it didn't seem to be available from the default repositories used by 
yum but it was available from CPAN.

Because there were dozens of sources that I read, plus probably 
thousands of others that I didn't read, saying that installing from CPAN 
was a way to install Perl modules, I figured it was reasonably safe to 
follow those directions, so I went ahead and did it.

Now, later I found out that you can get your machine into an 
inconsistent state by installing things from both CPAN and yum 
repositories, and moreover apparently you can't even properly uninstall 
things that are installed by CPAN:
http://stackoverflow.com/questions/2626449/how-can-i-de-install-a-perl-module-installed-via-cpan
so by following directions to the letter which are repeated in thousands 
of sources, I apparently put my machine in a state that will cause 
frequent unpredictable conflicts with all the things installed by the 
system package manager, and the damage is irreversible.

Is that about right? :)

At about the same time I learned not to use CPAN, the person helping me 
solve the current problem said that I could make the run-time errors go 
away by going into CPAN and install Math::BigInt -- which led to a new 
error, getting "Math::BigInt: couldn't load specified math lib(s), 
fallback to Math::BigInt::Calc at 
/usr/lib/perl5/vendor_perl/5.8.8/Crypt/DH.pm line 6", so then I 
installed Math::BigInt::Pari through CPAN and it fixed the problem. I 
had to use CPAN because it was the only solution he knew and it was an 
emergency to get that error fixed.

So, going forward, to mitigate the damage, should I just take all the 
packages that are currently only listed as installed on the old machine, 
truncate the version number (so e.g. truncate 
"perl-Compress-Raw-Zlib-2.052-1.el5.rf" to just 
"perl-Compress-Raw-Zlib2") and install that with yum on the command 
line?  (Thanks for that list, by the way.)

And more generally, what is the best practice if I want to install a 
module like Crypt::Twofish that was not in the default yum repositories, 
if John and C.L. are saying to avoid CPAN, and both John and Tom are 
saying to avoid adding extra yum repositories?  I'd like to use yum just 
for consistency since it automatically handles dependencies and such, 
and at least if I always use yum, then yum will always be "aware" of 
what's installed already (as opposed to things installed from CPAN).

Bennett

> I would work
> to bring the new machine's perl environment as close to that of the old machine's.
>
> Indeed, perl-Net-SFTP package is only installed on the new machine!
>
> Your package output is reformatted here. Work through this to bring your environments as close as
> possible and check if you have used CPAN to install packages in the past.
>
> $ diff -yW80 /tmp/oldlist /tmp/newlist
> perl-5.8.8-41.el5                       perl-5.8.8-41.el5
> perl-Compress-Raw-Bzip2-2.052-1.el5.r | perl-Class-Loader-2.03-1.2.el5.rf
> perl-Compress-Raw-Zlib-2.052-1.el5.rf | perl-Compress-Zlib-1.42-1.fc6
> perl-Convert-ASN1-0.22-1.el5.rf       | perl-Convert-ASCII-Armour-1.4-1.2.el5
> perl-Crypt-SSLeay-0.57-3.el5.rf       | perl-Convert-ASN1-0.20-1.1
> perl-DBD-mysql-4.014-1.el5.rf         | perl-Convert-PEM-0.07-1.2.el5.rf
> perl-DBI-1.615-1.el5.rf               | perl-Crypt-CBC-2.30-1.el5.rf
>                                        > perl-Crypt-DES-2.05-3.2.el5.rf
>                                        > perl-Crypt-DH-0.06-1.2.el5.rf
>                                        > perl-Crypt-DSA-1.16-1.el5.rf
>                                        > perl-Crypt-IDEA-1.08-1.el5.rf
>                                        > perl-Crypt-Primes-0.50-1.2.el5.rf
>                                        > perl-Crypt-RSA-1.99-1.el5.rf
>                                        > perl-Crypt-Random-1.25-1.2.el5.rf
>                                        > perl-Crypt-Twofish-2.13-1.el5.rf
>                                        > perl-DBD-MySQL-3.0007-2.el5
>                                        > perl-DBI-1.52-2.el5
>                                        > perl-Data-Buffer-0.04-1.2.el5.rf
> perl-Digest-HMAC-1.01-15                perl-Digest-HMAC-1.01-15
>                                        > perl-Digest-MD2-2.03-1.2.el5.rf
> perl-Digest-SHA1-2.11-1.2.1             perl-Digest-SHA1-2.11-1.2.1
> perl-Email-Date-Format-1.002-1.el5.rf | perl-File-Which-1.09-1.el5.rf
> perl-Expect-1.21-1.el5.rf             | perl-IPC-Run3-0.043-1.el5.rf
> perl-HTML-Parser-3.68-1.el5.rf        | perl-Math-GMP-2.05-1.el5.rf
> perl-HTML-Tagset-3.20-1.el5.rf        | perl-Math-Pari-2.01080603-1.el5.rf
> perl-HTTP-Server-Simple-0.43-1.el5.rf | perl-Net-SFTP-0.10-1.el5.rf
> perl-IO-Compress-2.030-2.el5.rf       | perl-Net-SSH-Perl-1.34-1.el5.rf
> perl-IO-Socket-SSL-1.01-2.el5         | perl-Probe-Perl-0.01-1.el5.rf
> perl-IO-Tty-1.08-2.el5.rf             | perl-Sort-Versions-1.5-1.2.el5.rf
> perl-LWP-UserAgent-Determined-1.04-1. | perl-String-CRC32-1.4-2.fc6
> perl-MIME-Lite-3.029-1.el5.rf         | perl-Test-Script-1.05-1.el5.rf
> perl-Net-DNS-0.59-3.el5               | perl-Tie-EncryptedHash-1.24-1.el5.rf
> perl-Net-Daemon-0.43-1.el5.rf         <
> perl-Net-IP-1.25-2.fc6                <
> perl-Net-SSLeay-1.36-1.el5.rf         <
> perl-Net-Telnet-3.03-5                <
> perl-PlRPC-0.2020-1.el5.rf            <
> perl-Sub-Uplevel-0.2002-1.el5.rf      <
> perl-Test-Mock-LWP-0.05-1.el5.rf      <
> perl-Test-MockObject-1.09-1.el5.rf    <
> perl-Test-Warn-0.22-1.el5.rf          <
> perl-Tree-DAG_Node-1.06-1.el5.rf      <
> perl-UNIVERSAL-can-1.16-1.el5.rf      <
> perl-UNIVERSAL-isa-1.03-1.el5.rf      <
> perl-URI-1.35-3                         perl-URI-1.35-3
> perl-WWW-Mechanize-1.72-1.el5.rf      <
> perl-XML-LibXML-1.70-2.el5.rf         <
> perl-XML-NamespaceSupport-1.11-1.el5. <
> perl-XML-SAX-0.96-1.el5.rf            <
> perl-libwww-perl-5.805-1.1.1          <
> perl-suidperl-5.8.8-41.el5              perl-suidperl-5.8.8-41.el5
>
>
>
>
>
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