MailScanner at ecs.soton.ac.uk
Mon Oct 27 11:36:48 GMT 2008
Rick Cooper wrote:
> > -----Original Message-----
> > From: mailscanner-bounces at lists.mailscanner.info
> > [mailto:mailscanner-bounces at lists.mailscanner.info] On
> > Behalf Of Julian Field
> > Sent: Tuesday, October 21, 2008 9:31 AM
> > To: MailScanner discussion
> > Subject: Re: more install.sh
> > Mark Nienberg wrote:
> > > I think on a centOS system the installer.sh is doing this
> > for the perl
> > > modules that conflict with the base perl:
> > >
> > > check to see if the perl module is installed,
> > > see that it isn't,
> > > build an rpm for the module from the downloaded src,
> > > attempt to install the rpm, but the install fails due to
> > conflict with
> > > installed perl,
> > > force install only for those that absolutely need it.
> > >
> > part of the
> > > the core perl installation? I suspect that must not be possible or
> > > Jules would have done it already.
> > Not easy. You can't find where a Perl module is installed,
> > just that it
> > *is* installed.
> Try perldoc -T perllocal. Outputs all modules that are installed in the
> following format:
> Mon Sep 8 12:53:02 2008: "Module" DBI::Shell
> * "installed into: /usr/lib/perl5/site_perl/5.8.8"
> * "LINKTYPE: dynamic"
> * "VERSION: 11.95"
> * "EXE_FILES: dbish"
> Not hard to parse, gives location (if that is really important) and version
> (where available). If you didn't want to return all modules and parse for
> the ones you want then
> cls;perldoc -t perllocal |grep -A 7 DBI::Shell
> Would return the above but only the one module DBI::Shell. Since you are
> using a shell script I suppose you would have to do a loop and something
> MODULE=`perldoc -t perllocal |grep -A 7 DBI::Shell|grep '"Module"'|sed
> 's/.*Module" //'`
> VERSION=`perldoc -t perllocal |grep -A 7 DBI::Shell|grep 'VERSION'|sed
> 's/.*VERSION: //'|sed 's/"//g'`
> LOCATION=`perldoc -t perllocal |grep -A 7 DBI::Shell|grep 'installed
> into'|sed 's/.*into: //'|sed 's/"//g'`
> Or better yet run the perldoc -t perllocal > tempfile.name
> And grep tempfile.name for the information so the call to perldoc would only
> be used once for speed.
> > >
> > > Also, the installer builds rpms for packages that will not
> > install due
> > > to already installed rpms. For example, on my system it builds
> > > perl-IO-stringy-2.110-1
> > > and tries to install it, but discovers that
> > > perl-IO-stringy-2.110-1.2.el5.rf
> > > is already installed.
> > >
> > > Could the installer test for already installed rpms before
> > building
> > > and attempting installation of the new one?
> > > In the above example it would run "rpm -q perl-IO-stringy"
> > and then do
> > > some sort of version checking.
> > The version checking you need to do is far from trivial.
> > 2.10 is greater
> > than 2.9, but not in numerical or alphabetical terms. It's quite a
> > tricky problem. I really don't want to open that Pandora's box! :-)
> > Nice ideas though...
> If you are just comparing parsed version numbers why not do the following
> with the above example (scale 7 should cover the weird 0.10789 versions)
> echo "scale=7;2.10 >= 2.9"|bc
> Which would output 0 but
> echo 'scale=7;2.10 <= 2.9' |bc
> Would output 1
Well, yes, but that's not so much use when:
2.10 <= 2.9
2.8 <= 2.9
Obviously 2.1 (as a number) is less than 2.9, I need it to be able to
tell that 2.10 (as a version number two point ten) > two point nine.
> Of course you would have to make sure that MODULE|VERSION != '' and install
> as required but that is trivial
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Julian Field MEng CITP CEng
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