1lib::core::only(3)    User Contributed Perl Documentation   lib::core::only(3)
2
3
4

NAME

6       lib::core::only - Remove all non-core paths from @INC to avoid
7       site/vendor dirs
8

SYNOPSIS

10         use lib::core::only; # now @INC contains only the two core directories
11
12       To get only the core directories plus the ones for the local::lib in
13       scope:
14
15         $ perl -Mlib::core::only -Mlocal::lib=~/perl5 myscript.pl
16
17       To attempt to do a self-contained build (but note this will not
18       reliably propagate into subprocesses, see the CAVEATS below):
19
20         $ PERL5OPT='-Mlib::core::only -Mlocal::lib=~/perl5' cpan
21

DESCRIPTION

23       lib::core::only is simply a shortcut to say "please reduce my @INC to
24       only the core lib and archlib (architecture-specific lib) directories
25       of this perl".
26
27       You might want to do this to ensure a local::lib contains only the code
28       you need, or to test an App::FatPacker tree, or to avoid known bad
29       vendor packages.
30
31       You might want to use this to try and install a self-contained tree of
32       perl modules. Be warned that that probably won't work (see "CAVEATS").
33
34       This module was extracted from local::lib's --self-contained feature,
35       and contains the only part that ever worked. I apologise to anybody who
36       thought anything else did.
37

CAVEATS

39       This does not propagate properly across perl invocations like
40       local::lib's stuff does. It can't. It's only a module import, so it
41       only affects the specific perl VM instance in which you load and
42       import() it.
43
44       If you want to cascade it across invocations, you can set the PERL5OPT
45       environment variable to '-Mlib::core::only' and it'll sort of work. But
46       be aware that taint mode ignores this, so some modules' build and test
47       code probably will as well.
48
49       You also need to be aware that perl's command line options are not
50       processed in order - -I options take effect before -M options, so
51
52         perl -Mlib::core::only -Ilib
53
54       is unlike to do what you want - it's exactly equivalent to:
55
56         perl -Mlib::core::only
57
58       If you want to combine a core-only @INC with additional paths, you need
59       to add the additional paths using -M options and the lib module:
60
61         perl -Mlib::core::only -Mlib=lib
62
63         # or if you're trying to test compiled code:
64
65         perl -Mlib::core::only -Mblib
66
67       For more information on the impossibility of sanely propagating this
68       across module builds without help from the build program, see
69       http://www.shadowcat.co.uk/blog/matt-s-trout/tainted-love
70       <http://www.shadowcat.co.uk/blog/matt-s-trout/tainted-love> - and for
71       ways to achieve the old --self-contained feature's results, look at
72       App::FatPacker's tree function, and at App::cpanminus's
73       --local-lib-contained feature.
74

AUTHOR

76       Matt S. Trout <mst@shadowcat.co.uk>
77

LICENSE

79       This library is free software under the same terms as perl itself.
80

82       (c) 2010 the lib::core::only "AUTHOR" as specified above.
83
84
85
86perl v5.12.2                      2010-06-09                lib::core::only(3)
Impressum