1 | =head1 NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | Canary::Stability - to be done |
3 | Canary::Stability - canary to check perl compatibility for schmorp's modules |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use Canary::Stability; |
7 | # in Makefile.PL |
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8 | use Canary::Stability DISTNAME => 2001, MINIMUM_PERL_VERSION; |
8 | |
9 | |
9 | =head1 DESCRIPTION |
10 | =head1 DESCRIPTION |
10 | |
11 | |
11 | This is just a placeholder module, to be filled later. |
12 | This module is used by Schmorp's modules during configuration stage to |
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13 | test the installed perl for compatibility with his modules. |
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14 | |
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15 | It's not, at this stage, meant as a tool for other module authors, |
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16 | although in principle nothing prevents them from subscribing to the same |
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17 | ideas. |
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18 | |
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19 | See the F<Makefile.PL> in L<Coro> or L<AnyEvent> for usage examples. |
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20 | |
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21 | =cut |
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22 | |
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23 | package Canary::Stability; |
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24 | |
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25 | BEGIN { |
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26 | $VERSION = 2011; |
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27 | } |
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28 | |
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29 | sub sgr { |
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30 | # we just assume ANSI almost everywhere |
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31 | # red 31, yellow 33, green 32 |
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32 | local $| = 1; |
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33 | |
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34 | $ENV{PERL_CANARY_STABILITY_COLOUR} ne 0 |
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35 | and ((-t STDOUT and length $ENV{TERM}) or $ENV{PERL_CANARY_STABILITY_COLOUR}) |
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36 | and print "\e[$_[0]m"; |
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37 | } |
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38 | |
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39 | sub import { |
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40 | my (undef, $distname, $minvers, $minperl) = @_; |
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41 | |
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42 | $ENV{PERL_CANARY_STABILITY_DISABLE} |
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43 | and return; |
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44 | |
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45 | $minperl ||= 5.008002; |
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46 | |
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47 | sgr 33; |
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48 | print <<EOF; |
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49 | |
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50 | *** |
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51 | *** Canary::Stability COMPATIBILITY AND SUPPORT CHECK |
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52 | *** ================================================= |
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53 | *** |
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54 | *** Hi! |
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55 | *** |
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56 | *** I do my best to provide predictable and reliable software. |
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57 | *** |
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58 | *** However, in recent releases, P5P (who maintain perl) have been |
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59 | *** introducing regressions that are sometimes subtle and at other times |
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60 | *** catastrophic, often for personal preferences with little or no concern |
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61 | *** for existing code, most notably CPAN. |
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62 | *** |
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63 | *** For this reason, it has become very hard for me to maintain the level |
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64 | *** of reliability and support I have committed myself to in the past, at |
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65 | *** least with some perl versions: I simply can't keep up working around new |
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66 | *** bugs or gratituous incompatibilities, and in turn you might suffer from |
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67 | *** unanticipated problems. |
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68 | *** |
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69 | *** Therefore I have introduced a support and compatibility check, the results |
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70 | *** of which follow below, together with a FAQ and some recommendations. |
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71 | *** |
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72 | *** This check is just to let you know that there might be a risk, so you can |
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73 | *** make judgement calls on how to proceed - it will not keep the module from |
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74 | *** installing or working. |
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75 | *** |
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76 | EOF |
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77 | |
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78 | if ($minvers > $VERSION) { |
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79 | sgr 33; |
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80 | print <<EOF; |
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81 | *** The stability canary says: (nothing, it died of old age). |
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82 | *** |
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83 | *** Your Canary::Stability module (used by $distname) is too old. |
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84 | *** This is not a fatal problem - while you might want to upgrade to version |
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85 | *** $minvers (currently installed version: $VERSION) to get better support |
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86 | *** status testing, you might also not want to care at all, and all will |
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87 | *** be well as long $distname works well enough for you, as the stability |
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88 | *** canary is only used when installing the distribution. |
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89 | EOF |
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90 | } elsif ($] < $minperl) { |
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91 | |
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92 | sgr 33; |
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93 | print <<EOF; |
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94 | *** The stability canary says: chirp (it seems concerned about something). |
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95 | *** |
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96 | *** Your perl version ($]) is older than the $distname distribution |
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97 | *** likes ($minperl). This is not a fatal problem - the module might work |
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98 | *** well with your version of perl, but it does mean the author likely |
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99 | *** won't do anything to make it work if it breaks. |
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100 | EOF |
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101 | } elsif (defined $Internals::StabilityBranchVersion) { |
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102 | # note to people studying this modules sources: |
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103 | # the above test is not considered a clean or stable way to |
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104 | # test for the stability branch. |
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105 | |
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106 | sgr 32; |
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107 | print <<EOF; |
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108 | *** The stability canary says: chirp! chirp! (it seems to be quite excited) |
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109 | *** |
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110 | *** It seems you are running schmorp's stability branch of perl. |
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111 | *** All should be well, and if it isn't, you should report this as a bug |
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112 | *** to the $distname author. |
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113 | EOF |
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114 | } elsif ($] < 5.021) { |
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115 | #sgr 32; |
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116 | print <<EOF; |
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117 | *** The stability canary says: chirp! chirp! (it seems to be quite happy) |
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118 | *** |
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119 | *** Your version of perl ($]) is quite supported by $distname, nothing |
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120 | *** else to be said, hope it comes in handy. |
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121 | EOF |
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122 | } else { |
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123 | sgr 31; |
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124 | print <<EOF; |
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125 | *** The stability canary says: (nothing, it was driven away by harsh weather) |
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126 | *** |
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127 | *** It seems you are running perl version $], likely the "official" or |
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128 | *** "standard" version. While there is nothing wrong with doing that, |
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129 | *** standard perl versions 5.022 and up are not supported by $distname. |
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130 | *** While this might be fatal, it might also be all right - if you run into |
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131 | *** problems, you might want to downgrade your perl or switch to the |
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132 | *** stability branch. |
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133 | *** |
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134 | *** If everything works fine, you can ignore this message. |
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135 | EOF |
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136 | sgr 0; |
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137 | print <<EOF; |
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138 | *** |
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139 | *** Stability canary mini-FAQ: |
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140 | *** |
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141 | *** Do I need to do anything? |
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142 | *** With luck, no. While some distributions are known to fail |
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143 | *** already, most should probably work. This message is here |
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144 | *** to alert you that your perl is not supported by $distname, |
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145 | *** and if things go wrong, you either need to downgrade, or |
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146 | *** sidegrade to the stability variant of your perl version, |
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147 | *** or simply live with the consequences. |
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148 | *** |
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149 | *** What is this canary thing? |
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150 | *** It's purpose is to check support status of $distname with |
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151 | *** respect to your perl version. |
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152 | *** |
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153 | *** What is this "stability branch"? |
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154 | *** It's a branch or fork of the official perl, by schmorp, to |
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155 | *** improve stability and compatibility with existing modules. |
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156 | *** |
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157 | *** How can I skip this prompt on automated installs? |
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158 | *** Set PERL_CANARY_STABILITY_NOPROMPT=1 in your environment. |
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159 | *** More info is in the Canary::Stability manpage. |
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160 | *** |
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161 | *** Long version of this FAQ: http://stableperl.schmorp.de/faq.html |
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162 | *** Stability Branch homepage: http://stableperl.schmorp.de/ |
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163 | *** |
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164 | |
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165 | EOF |
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166 | |
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167 | unless ($ENV{PERL_CANARY_STABILITY_NOPROMPT}) { |
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168 | require ExtUtils::MakeMaker; |
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169 | |
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170 | ExtUtils::MakeMaker::prompt ("Continue anyways? ", "y") =~ /^y/i |
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171 | or die "FATAL: User aborted configuration of $distname.\n"; |
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172 | } |
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173 | } |
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174 | |
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175 | sgr 0; |
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176 | } |
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177 | |
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178 | =head1 ENVIRONMENT VARIABLES |
12 | |
179 | |
13 | =over 4 |
180 | =over 4 |
14 | |
181 | |
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182 | =item C<PERL_CANARY_STABILITY_NOPROMPT=1> |
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183 | |
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184 | Do not prompt the user on alert messages. |
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185 | |
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186 | =item C<PERL_CANARY_STABILITY_COLOUR=0> |
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187 | |
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188 | Disable use of colour. |
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189 | |
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190 | =item C<PERL_CANARY_STABILITY_COLOUR=1> |
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191 | |
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192 | Force use of colour. |
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193 | |
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194 | =item C<PERL_CANARY_STABILITY_DISABLE=1> |
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195 | |
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196 | Disable this modules functionality completely. |
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197 | |
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198 | =back |
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199 | |
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200 | =head1 AUTHOR |
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201 | |
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202 | Marc Lehmann <schmorp@schmorp.de> |
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203 | http://software.schmorp.de/pkg/Canary-Stability.html |
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204 | |
15 | =cut |
205 | =cut |
16 | |
206 | |
17 | package Canary::Stability; |
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18 | |
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19 | BEGIN { |
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20 | $VERSION = 1996; #รค the year the ariane 5 crashed due to a software bug |
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21 | } |
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22 | |
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23 | sub import { |
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24 | # |
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25 | } |
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26 | |
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27 | =head1 AUTHOR |
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28 | |
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29 | Marc Lehmann <schmorp@schmorp.de> |
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30 | http://home.schmorp.de/ |
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31 | |
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32 | =cut |
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33 | |
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34 | 1 |
207 | 1 |
35 | |
208 | |