File perl-Lexical-SealRequireHints.spec of Package perl-Lexical-SealRequireHints

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File perl-Lexical-SealRequireHints.spec of Package perl-Lexical-SealRequireHints (Revision 69cabbb9da9120f7cb7b2767bb4921f5)

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#
# spec file for package perl-Lexical-SealRequireHints
#
# Copyright (c) 2017 SUSE LINUX GmbH, Nuernberg, Germany.
#
# All modifications and additions to the file contributed by third parties
# remain the property of their copyright owners, unless otherwise agreed
# upon. The license for this file, and modifications and additions to the
# file, is the same license as for the pristine package itself (unless the
# license for the pristine package is not an Open Source License, in which
# case the license is the MIT License). An "Open Source License" is a
# license that conforms to the Open Source Definition (Version 1.9)
# published by the Open Source Initiative.

# Please submit bugfixes or comments via http://bugs.opensuse.org/
#

Name:           perl-Lexical-SealRequireHints
Version:        0.011
Release:        0
%define cpan_name Lexical-SealRequireHints
Summary:        Prevent Leakage of Lexical Hints
License:        Artistic-1.0 or GPL-1.0+
Group:          Development/Libraries/Perl
Url:            http://search.cpan.org/dist/Lexical-SealRequireHints/
Source0:        https://cpan.metacpan.org/authors/id/Z/ZE/ZEFRAM/%{cpan_name}-%{version}.tar.gz
Source1:        cpanspec.yml
BuildRoot:      %{_tmppath}/%{name}-%{version}-build
BuildRequires:  perl
BuildRequires:  perl-macros
BuildRequires:  perl(Module::Build)
%{perl_requires}

%description
This module works around two historical bugs in Perl's handling of the
'%^H' (lexical hints) variable. One bug causes lexical state in one file to
leak into another that is 'require'd/'use'd from it. This bug, [perl
#68590], was present from Perl 5.6 up to Perl 5.10, fixed in Perl 5.11.0.
The second bug causes lexical state (normally a blank '%^H' once the first
bug is fixed) to leak outwards from 'utf8.pm', if it is automatically
loaded during Unicode regular expression matching, into whatever source is
compiling at the time of the regexp match. This bug, [perl #73174], was
present from Perl 5.8.7 up to Perl 5.11.5, fixed in Perl 5.12.0.

Both of these bugs seriously damage the usability of any module relying on
'%^H' for lexical scoping, on the affected Perl versions. It is in practice
essential to work around these bugs when using such modules. On versions of
Perl that require such a workaround, this module globally changes the
behaviour of 'require', including 'use' and the implicit 'require'
performed in Unicode regular expression matching, so that it no longer
exhibits these bugs.

The workaround supplied by this module takes effect the first time its
'import' method is called. Typically this will be done by means of a 'use'
statement. This should be done as early as possible, because it only
affects 'require'/'use' statements that are compiled after the workaround
goes into effect. For 'use' statements, and 'require' statements that are
executed immediately and only once, it suffices to invoke the workaround
when loading the first module that will set up vulnerable lexical state.
Delayed-action 'require' statements, however, are more troublesome, and can
require the workaround to be loaded much earlier. Ultimately, an affected
Perl program may need to load the workaround as very nearly its first
action. Invoking this module multiple times, from multiple modules, is not
a problem: the workaround is only applied once, and applies to everything
subsequently compiled.

This module is implemented in XS, with a pure Perl backup version for
systems that can't handle XS modules. The XS version has a better chance of
playing nicely with other modules that modify 'require' handling. The pure
Perl version can't work at all on some Perl versions; users of those
versions must use the XS. On all Perl versions suffering the underlying
hint leakage bug, pure Perl hooking of 'require' breaks the use of
'require' without an explicit parameter (implicitly using '$_').

%prep
%setup -q -n %{cpan_name}-%{version}

%build
%{__perl} Build.PL installdirs=vendor optimize="%{optflags}"
./Build build flags=%{?_smp_mflags}

%check
./Build test

%install
./Build install destdir=%{buildroot} create_packlist=0
%perl_gen_filelist

%files -f %{name}.files
%defattr(-,root,root,755)
%doc Changes README

%changelog

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File perl-Lexical-SealRequireHints.spec of Package perl-Lexical-SealRequireHints (Revision 69cabbb9da9120f7cb7b2767bb4921f5)

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