1 | #!/usr/bin/perl -w
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2 | #
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3 | # ProjectBuilder Conf module
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4 | # Conf files subroutines brought by the the Project-Builder project
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5 | # which can be easily used by wahtever perl project
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6 | #
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7 | # Copyright B. Cornec 2007-2012
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8 | # Eric Anderson's changes are (c) Copyright 2012 Hewlett Packard
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9 | # Provided under the GPL v2
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10 | #
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11 | # $Id$
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12 | #
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13 |
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14 | package ProjectBuilder::Conf;
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15 |
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16 | use strict;
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17 | use Carp 'confess';
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18 | use Data::Dumper;
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19 | use ProjectBuilder::Base;
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20 | use ProjectBuilder::Version;
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21 |
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22 | # Inherit from the "Exporter" module which handles exporting functions.
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23 |
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24 | use vars qw($VERSION $REVISION @ISA @EXPORT);
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25 | use Exporter;
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26 |
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27 | # Export, by default, all the functions into the namespace of
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28 | # any code which uses this module.
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29 |
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30 | our @ISA = qw(Exporter);
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31 | our @EXPORT = qw(pb_conf_init pb_conf_add pb_conf_read pb_conf_read_if pb_conf_get pb_conf_get_if pb_conf_print pb_conf_get_all);
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32 | ($VERSION,$REVISION) = pb_version_init();
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33 |
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34 | # Global hash of conf files
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35 | # Key is the conf file name
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36 | # Value is its rank
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37 | my %pbconffiles;
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38 |
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39 | # Global hash of conf file content
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40 | # Key is the config keyword
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41 | # Value is a hash whose key depends on the nature of the config keyword as documented
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42 | # and value is the confguration value
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43 | # We consider that values can not change during the life of pb
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44 | my $h = ();
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45 |
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46 | =pod
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47 |
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48 | =head1 NAME
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49 |
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50 | ProjectBuilder::Conf, part of the project-builder.org - module dealing with configuration files
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51 |
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52 | =head1 DESCRIPTION
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53 |
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54 | This modules provides functions dealing with configuration files.
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55 |
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56 | =head1 SYNOPSIS
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57 |
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58 | use ProjectBuilder::Conf;
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59 |
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60 | #
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61 | # Read hash codes of values from a configuration file and return table of pointers
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62 | #
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63 | my ($k1, $k2) = pb_conf_read_if("$ENV{'HOME'}/.pbrc","key1","key2");
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64 | my ($k) = pb_conf_read("$ENV{'HOME'}/.pbrc","key");
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65 |
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66 | =head1 USAGE
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67 |
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68 | =over 4
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69 |
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70 | =item B<pb_conf_init>
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71 |
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72 | This function setup the environment PBPROJ for project-builder function usage from other projects.
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73 | The first parameter is the project name.
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74 | It sets up environment variables (PBPROJ)
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75 |
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76 | =cut
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77 |
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78 | sub pb_conf_init {
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79 |
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80 | my $proj=shift || undef;
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81 |
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82 | pb_log(1,"Entering pb_conf_init\n");
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83 | #
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84 | # Check project name
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85 | # Could be with env var PBPROJ
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86 | # or option -p
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87 | # if not defined take the first in conf file
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88 | #
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89 | if ((defined $ENV{'PBPROJ'}) &&
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90 | (not defined $proj)) {
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91 | pb_log(2,"PBPROJ env var setup ($ENV{'PBPROJ'}) so using it\n");
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92 | $proj = $ENV{'PBPROJ'};
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93 | }
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94 |
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95 | if (defined $proj) {
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96 | $ENV{'PBPROJ'} = $proj;
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97 | } else {
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98 | $ENV{'PBPROJ'} = "default";
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99 | }
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100 | pb_log(1,"PBPROJ = $ENV{'PBPROJ'}\n");
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101 | }
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102 |
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103 |
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104 | =item B<pb_conf_cache>
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105 |
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106 | This function caches the configuration file content passed as first parameter into the a hash passed in second parameter
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107 | It returns the modified hash
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108 | Can be used in correlation with the %h hash to store permanently values or not if temporarily.
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109 |
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110 | =cut
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111 |
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112 | sub pb_conf_cache {
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113 |
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114 | my $cf = shift;
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115 | my $lh = shift;
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116 |
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117 | # Read the content of the config file and cache it in the %h hash further availble for queries
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118 | open(CONF,$cf) || confess "Unable to open $cf";
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119 | while(<CONF>) {
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120 | if (/^\s*([A-z0-9-_.]+)\s+([[A-z0-9-_.]+)\s*=\s*(.*)$/) {
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121 | pb_log(3,"DEBUG: 1:$1 2:$2 3:$3\n");
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122 | $lh->{$1}->{$2}=$3;
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123 | }
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124 | }
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125 | close(CONF);
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126 | return($lh);
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127 | }
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128 |
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129 | =item B<pb_conf_add>
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130 |
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131 | This function adds the configuration file to the list last, and cache their content in the %h hash
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132 |
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133 | =cut
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134 |
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135 | sub pb_conf_add {
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136 |
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137 | pb_log(2,"DEBUG: pb_conf_add with ".Dumper(@_)."\n");
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138 | my $lh;
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139 |
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140 | foreach my $cf (@_) {
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141 | if (! -r $cf) {
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142 | pb_log(0,"WARNING: pb_conf_add can not read $cf\n");
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143 | next;
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144 | }
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145 | # Skip already used conf files
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146 | return($lh) if (defined $pbconffiles{$cf});
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147 |
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148 | # Add the new one at the end
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149 | my $num = keys %pbconffiles;
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150 | pb_log(2,"DEBUG: pb_conf_cache of $cf at position $num\n");
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151 | $pbconffiles{$cf} = $num;
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152 |
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153 | # Read the content of the config file
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154 | $lh = pb_conf_cache($cf,$lh);
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155 | # and cache it in the %h hash for further queries but after the previous
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156 | # as we load conf files in reverse order (most precise first)
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157 | pb_conf_add_last_in_hash($lh)
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158 | }
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159 | }
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160 |
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161 |
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162 | =item B<pb_conf_read_if>
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163 |
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164 | This function returns a table of pointers on hashes
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165 | corresponding to the keys in a configuration file passed in parameter.
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166 | If that file doesn't exist, it returns undef.
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167 |
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168 | The format of the configuration file is as follows:
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169 |
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170 | key tag = value1,value2,...
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171 |
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172 | Supposing the file is called "$ENV{'HOME'}/.pbrc", containing the following:
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173 |
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174 | $ cat $HOME/.pbrc
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175 | pbver pb = 3
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176 | pbver default = 1
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177 | pblist pb = 12,25
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178 |
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179 | calling it like this:
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180 |
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181 | my ($k1, $k2) = pb_conf_read_if("$ENV{'HOME'}/.pbrc","pbver","pblist");
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182 |
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183 | will allow to get the mapping:
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184 |
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185 | $k1->{'pb'} contains 3
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186 | $k1->{'default'} contains 1
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187 | $k2->{'pb'} contains 12,25
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188 |
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189 | Valid chars for keys and tags are letters, numbers, '-' and '_'.
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190 |
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191 | The file read is forgotten after its usage. If you want permanent caching of the data, use pb_conf_add then pb_conf_get
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192 |
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193 | =cut
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194 |
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195 | sub pb_conf_read_if {
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196 |
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197 | my $conffile = shift;
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198 | my @param = @_;
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199 |
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200 | open(CONF,$conffile) || return((undef));
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201 | close(CONF);
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202 | return(pb_conf_read($conffile,@param));
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203 | }
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204 |
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205 | =item B<pb_conf_read>
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206 |
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207 | This function is similar to B<pb_conf_read_if> except that it dies when the file in parameter doesn't exist.
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208 |
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209 | =cut
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210 |
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211 | sub pb_conf_read {
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212 |
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213 | my $conffile = shift;
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214 | my @param = @_;
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215 | my @ptr;
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216 | my $lh;
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217 |
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218 | $lh = pb_conf_cache($conffile,$lh);
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219 |
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220 | foreach my $param (@param) {
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221 | push @ptr,$lh->{$param};
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222 | }
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223 | return(@ptr);
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224 | }
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225 |
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226 |
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227 |
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228 | =item B<pb_conf_get_in_hash_if>
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229 |
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230 | This function returns a table, corresponding to a set of values queried in the hash passed in parameter or undef if it doesn't exist.
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231 | It takes a table of keys as an input parameter.
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232 |
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233 | =cut
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234 |
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235 | sub pb_conf_get_in_hash_if {
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236 |
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237 | my $lh = shift || return(());
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238 | my @params = @_;
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239 | my @ptr = ();
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240 |
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241 | pb_log(2,"DEBUG: pb_conf_get_in_hash_if on params ".join(' ',@params)."\n");
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242 | foreach my $k (@params) {
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243 | push @ptr,$lh->{$k};
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244 | }
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245 |
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246 | pb_log(2,"DEBUG: pb_conf_get_in_hash_if returns\n".Dumper(@ptr));
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247 | return(@ptr);
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248 | }
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249 |
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250 |
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251 |
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252 | =item B<pb_conf_get_if>
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253 |
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254 | This function returns a table, corresponding to a set of values queried in the %h hash or undef if it doen't exist. It takes a table of keys as an input parameter.
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255 |
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256 | The format of the configurations file is as follows:
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257 |
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258 | key tag = value1,value2,...
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259 |
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260 | It will gather the values from all the configurations files passed to pb_conf_add, and return the values for the keys
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261 |
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262 | $ cat $HOME/.pbrc
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263 | pbver pb = 1
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264 | pblist pb = 4
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265 | $ cat $HOME/.pbrc2
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266 | pbver pb = 3
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267 | pblist default = 5
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268 |
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269 | calling it like this:
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270 |
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271 | pb_conf_add("$HOME/.pbrc","$HOME/.pbrc2");
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272 | my ($k1, $k2) = pb_conf_get_if("pbver","pblist");
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273 |
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274 | will allow to get the mapping:
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275 |
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276 | $k1->{'pb'} contains 3
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277 | $k2->{'pb'} contains 4
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278 |
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279 | Valid chars for keys and tags are letters, numbers, '-' and '_'.
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280 |
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281 | =cut
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282 |
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283 | sub pb_conf_get_if {
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284 |
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285 | return(pb_conf_get_in_hash_if($h,@_));
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286 | }
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287 |
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288 | =item B<pb_conf_add_last_in_hash>
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289 |
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290 | This function merges the values passed in the hash parameter into the %h hash, but only if itdoesn't already contain a value, or if the value is more precise (real value instead of default)
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291 |
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292 | It is used internally by pb_conf_add and is not exported.
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293 |
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294 | =cut
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295 |
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296 | sub pb_conf_add_last_in_hash {
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297 |
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298 | my $ptr = shift || undef;
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299 |
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300 | return if (not defined $ptr);
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301 | # TODO: test $ptr is a hash pointer
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302 |
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303 | # When called without correct initialization, try to work anyway with default as project
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304 | pb_conf_init("default") if (not defined $ENV{'PBPROJ'});
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305 |
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306 | my @params = (sort keys %$ptr);
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307 |
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308 | # Everything is returned via @h
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309 | # @h contains the values overloading what @ptr may contain.
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310 | my @h = pb_conf_get_if(@params);
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311 | my @ptr = pb_conf_get_in_hash_if($ptr,@params);
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312 |
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313 | my $p1;
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314 | my $p2;
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315 |
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316 | pb_log(2,"DEBUG: pb_conf_add_last_in_hash params: ".Dumper(@params)."\n");
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317 | pb_log(2,"DEBUG: pb_conf_add_last_in_hash hash: ".Dumper(@h)."\n");
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318 | pb_log(2,"DEBUG: pb_conf_add_last_in_hash input: ".Dumper(@ptr)."\n");
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319 |
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320 | foreach my $i (0..$#params) {
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321 | $p1 = $h[$i];
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322 | $p2 = $ptr[$i];
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323 | # Always try to take the param from h
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324 | # in order to mask what could be defined already in ptr
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325 | if (not defined $p2) {
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326 | # exit if no p1 either
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327 | next if (not defined $p1);
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328 | # No ref in p2 so use p1
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329 | $p1->{$ENV{'PBPROJ'}} = $p1->{'default'} if ((not defined $p1->{$ENV{'PBPROJ'}}) && (defined $p1->{'default'}));
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330 | } else {
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331 | # Ref found in p2
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332 | if (not defined $p1) {
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333 | # No ref in p1 so use p2's value
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334 | $p2->{$ENV{'PBPROJ'}} = $p2->{'default'} if ((not defined $p2->{$ENV{'PBPROJ'}}) && (defined $p2->{'default'}));
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335 | $p1 = $p2;
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336 | } else {
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337 | # Both are defined - handling the overloading
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338 | if (not defined $p1->{'default'}) {
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339 | if (defined $p2->{'default'}) {
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340 | $p1->{'default'} = $p2->{'default'};
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341 | }
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342 | }
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343 |
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344 | if (not defined $p1->{$ENV{'PBPROJ'}}) {
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345 | if (defined $p2->{$ENV{'PBPROJ'}}) {
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346 | $p1->{$ENV{'PBPROJ'}} = $p2->{$ENV{'PBPROJ'}};
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347 | } else {
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348 | $p1->{$ENV{'PBPROJ'}} = $p1->{'default'} if (defined $p1->{'default'});
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349 | }
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350 | }
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351 | # Now copy back into p1 all p2 content which doesn't exist in p1
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352 | # p1 content always has priority over p2
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353 | foreach my $k (keys %$p2) {
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354 | $p1->{$k} = $p2->{$k} if (not defined $p1->{$k});
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355 | }
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356 | }
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357 | }
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358 | $h->{$params[$i]} = $p1;
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359 | }
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360 | pb_log(2,"DEBUG: pb_conf_add_last_in_hash output: ".Dumper($h)."\n");
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361 | }
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362 |
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363 | =item B<pb_conf_get>
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364 |
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365 | This function is the same B<pb_conf_get_if>, except that it tests each returned value as they need to exist in that case.
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366 |
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367 | =cut
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368 |
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369 | sub pb_conf_get {
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370 |
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371 | my @param = @_;
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372 | my @return = pb_conf_get_if(@param);
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373 | my $proj = undef;
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374 |
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375 | if (not defined $ENV{'PBPROJ'}) {
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376 | $proj = "unknown";
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377 | } else {
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378 | $proj = $ENV{'PBPROJ'};
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379 | }
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380 |
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381 | confess "No params found for $proj" if (not @return);
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382 |
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383 | foreach my $i (0..$#param) {
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384 | confess "No $param[$i] defined for $proj" if (not defined $return[$i]);
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385 | }
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386 | return(@return);
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387 | }
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388 |
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389 |
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390 | =item B<pb_conf_get_all>
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391 |
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392 | This function returns an array wirh all configuration parameters
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393 |
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394 | =cut
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395 |
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396 | sub pb_conf_get_all {
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397 |
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398 | return(sort keys %$h);
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399 | }
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400 |
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401 | =back
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402 |
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403 | =head1 WEB SITES
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404 |
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405 | The main Web site of the project is available at L<http://www.project-builder.org/>. Bug reports should be filled using the trac instance of the project at L<http://trac.project-builder.org/>.
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406 |
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407 | =head1 USER MAILING LIST
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408 |
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409 | None exists for the moment.
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410 |
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411 | =head1 AUTHORS
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412 |
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413 | The Project-Builder.org team L<http://trac.project-builder.org/> lead by Bruno Cornec L<mailto:bruno@project-builder.org>.
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414 |
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415 | =head1 COPYRIGHT
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416 |
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417 | Project-Builder.org is distributed under the GPL v2.0 license
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418 | described in the file C<COPYING> included with the distribution.
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419 |
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420 | =cut
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421 |
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422 |
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423 | 1;
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