NAME
Devel::CheckOS - check what OS we're running on
DESCRIPTION
Devel::CheckOS provides a more friendly interface to $^O, and also lets you check for various OS "families" such as "Unix", which includes things like Linux, Solaris, AIX etc.
SYNOPSIS
use Devel::CheckOS qw(os_is);
print "Hey, I know this, it's a Unix system\n" if(os_is('Unix'));
print "You've got Linux 2.6\n" if(os_is('Linux::v2_6'));USING IT IN Makefile.PL or Build.PL
If you want to use this from Makefile.PL or Build.PL, do not simply copy the module into your distribution as this may cause problems when PAUSE and search.cpan.org index the distro. Instead, use the use-devel-assertos script.
FUNCTIONS
Devel::CheckOS implements the following functions, which load subsidiary OS-specific modules on demand to do the real work. They can be exported by listing their names after use Devel::CheckOS. You can also export groups of functions thus:
use Devel::CheckOS qw(:booleans); # export the boolean functions
# and 'die_unsupported'
use Devel::CheckOS qw(:fatal); # export those that die on no match
use Devel::CheckOS qw(:all); # export everythingBoolean functions
os_is
Takes a list of OS names. If the current platform matches any of them, it returns true, otherwise it returns false. The names can be a mixture of OSes and OS families, eg ...
os_is(qw(Unix VMS)); # Unix is a family, VMS is an OSos_isnt
If the current platform matches any of the parameters it returns false, otherwise it returns true.
Fatal functions
die_if_os_isnt
As os_is(), except that it dies instead of returning false. The die() message matches what the CPAN-testers look for to determine if a module doesn't support a particular platform.
die_if_os_is
As os_isnt(), except that it dies instead of returning false.
And some utility functions ...
die_unsupported
This function simply dies with the message "OS unsupported", which is what the CPAN testers look for to figure out whether a platform is supported or not.
list_platforms
When called in list context, return a list of all the platforms for which the corresponding Devel::AssertOS::* module is available. This includes both OSes and OS families, and both those bundled with this module and any third-party add-ons you have installed.
In scalar context, returns a hashref keyed by platform with the filename of the most recent version of the supporting module that is available to you. This is to make sure that the use-devel-assertos script Does The Right Thing in the case where you have installed the module in one version of perl, then upgraded perl, and installed it again in the new version. Sometimes the old version of perl and all its modules will still be hanging around and perl "helpfully" includes the old perl's search path in its own.
Unfortunately, on some platforms this list may have file case broken. eg, some platforms might return 'freebsd' instead of 'FreeBSD'. This is because they have case-insensitive filesystems so things should Just Work anyway.
PLATFORMS SUPPORTED
To see the list of platforms for which information is available, run this:
perl -MDevel::CheckOS -e 'print join(", ", Devel::CheckOS::list_platforms())'Note that capitalisation is important. These are the names of the underlying Devel::AssertOS::* modules which do the actual platform detection, so they have to be 'legal' filenames and module names, which unfortunately precludes funny characters, so platforms like OS/2 are mis-spelt deliberately. Sorry.
Also be aware that not all of them have been properly tested. I don't have access to most of them and have had to work from information gleaned from perlport and a few other places.
The following OS 'families' are supported 'out of the box':
Apple (Mac OS, both classic and OS X)
DEC
MicrosoftWindows (this matches either MSWin32 or Cygwin)
Sun
UnixIf you want to add your own OSes or families, see Devel::AssertOS::Extending and please feel free to upload the results to the CPAN.
BUGS and FEEDBACK
I welcome feedback about my code, including constructive criticism. Bug reports should be made using http://rt.cpan.org/ or by email.
You will need to include in your bug report the exact value of $^O, what the OS is called (eg Windows Vista 64 bit Ultimate Home Edition), and, if relevant, what "OS family" it should be in and who wrote it.
If you are feeling particularly generous you can encourage me in my open source endeavours by buying me something from my wishlist: http://www.cantrell.org.uk/david/wishlist/
SEE ALSO
$^O in perlvar
The use-devel-assertos script
AUTHOR
David Cantrell <david@cantrell.org.uk>
Thanks to David Golden for the name and ideas about the interface, and to the cpan-testers-discuss mailing list for prompting me to write it in the first place.
Thanks to Ken Williams, from whose Module::Build I lifted some of the information about what should be in the Unix family.
Thanks to Billy Abbott for finding some bugs for me on VMS.
CVS
http://drhyde.cvs.sourceforge.net/drhyde/perlmodules/Devel-CheckOS/
COPYRIGHT and LICENCE
Copyright 2007 David Cantrell
This module is free-as-in-speech software, and may be used, distributed, and modified under the same conditions as perl itself.
CONSPIRACY
This module is also free-as-in-mason software.