1 | #!/usr/bin/perl -w
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2 | #
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3 | # $Id$
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4 | # Copyright B. Cornec 2005-2014
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5 | # Provided under the GPL v2
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6 | #
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7 | # Get the complete network configuration of the system
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8 | #
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9 | use strict 'vars';
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10 | use ProjectBuilder::Base;
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11 | use ProjectBuilder::Version;
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12 | use MondoRescue::Version;
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13 | use Data::Dumper;
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14 | use Getopt::Long qw(:config auto_abbrev no_ignore_case);
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15 | use English;
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16 |
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17 |
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18 | =pod
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19 |
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20 | =head1 NAME
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21 |
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22 | mr-label labelling tool
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23 |
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24 | =head1 DESCRIPTION
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25 |
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26 | mr-label labels VFAT devices or files representing VFAT devices
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27 |
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28 | =head1 SYNOPSIS
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29 |
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30 | mr-label [-v][-h][-L LABEL|-U UUID] device|file
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31 |
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32 | =head1 ARGUMENTS
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33 |
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34 | =over 4
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35 |
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36 | =item B<device|file>
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37 |
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38 | This is the VFAT device or file representing a VFAT device to modify with regards to its label
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39 |
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40 | =back
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41 |
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42 | =head1 OPTIONS
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43 |
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44 | =over 4
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45 |
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46 | =item B<-v|--verbose>
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47 |
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48 | Increase verbosity
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49 |
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50 | =item B<-h|--help>
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51 |
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52 | Print a brief help message and exits.
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53 |
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54 | =item B<--man>
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55 |
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56 | Prints the manual page and exits.
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57 |
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58 | =item B<-L LABEL>
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59 |
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60 | This is the new LABEL to put on the VFAT filesystem
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61 |
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62 | =item B<-U UUID>
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63 |
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64 | This is the new UUID to put on the VFAT filesystem
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65 |
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66 | =back
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67 |
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68 | =head1 WEB SITES
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69 |
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70 | The main Web site of the project is available at L<http://www.mondorescue.org>. Bug reports should be filled using the trac instance of the project at L<http://trac.mondorescue.org/>.
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71 |
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72 | =head1 USER MAILING LIST
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73 |
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74 | For community exchanges around MondoRescue please use the list L<http://sourceforge.net/mailarchive/forum.php?forum_name=mondo-devel>
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75 |
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76 | =head1 AUTHORS
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77 |
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78 | The MondoRescue team lead by Bruno Cornec L<mailto:bruno@mondorescue.org>.
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79 |
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80 | =head1 COPYRIGHT
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81 |
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82 | MondoRescue is distributed under the GPL v2.0 license or later,
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83 | described in the file C<COPYING> included with the distribution.
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84 |
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85 | =cut
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86 |
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87 | # Global variables
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88 | my ($mrver,$mrrev) = mr_version_init();
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89 | my $appname = "mr-label";
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90 | my %opts; # CLI Options
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91 |
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92 | # Initialize the syntax string
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93 |
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94 | pb_syntax_init("$appname Version $mrver-$mrrev\n");
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95 |
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96 | GetOptions("help|?|h" => \$opts{'h'},
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97 | "man" => \$opts{'man'},
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98 | "verbose|v+" => \$opts{'v'},
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99 | "label|L=s" => \$opts{'L'},
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100 | "uuid|U=s" => \$opts{'U'},
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101 | ) || pb_syntax(-1,0);
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102 |
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103 | if (defined $opts{'h'}) {
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104 | pb_syntax(0,1);
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105 | }
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106 | if (defined $opts{'man'}) {
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107 | pb_syntax(0,2);
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108 | }
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109 | if (defined $opts{'v'}) {
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110 | $pbdebug++;
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111 | }
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112 | pb_log_init($pbdebug, $pbLOG);
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113 | pb_temp_init($pbdebug);
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114 |
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115 | my $label=$opts{'L'};
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116 | my $uuid=$opts{'U'};
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117 | die "Unable no label/uuid defined" if ((not defined $label) && (not defined $uuid));
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118 |
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119 | my $inputf = $ARGV[0];
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120 | die "$0: no input file defined" if (not defined $inputf);
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121 |
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122 | my($inputfh, $buffer, $offset, $length, $hexlabel);
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123 |
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124 | # Evaluate the size of the FAT with blkid -p
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125 | open(FS,"blkid -p $inputf|") || die "$0: cannot blkid -p $inputf: $!";
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126 | my $verfs = <FS>;
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127 | close(FS);
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128 | $verfs =~ s/.*VERSION="FAT([0-9][0-9]).*"/FAT$1/;
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129 | chomp($verfs);
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130 | pb_log(1,"Working on a FS ot type ***$verfs***\n");
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131 |
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132 | open($inputfh, "+< $inputf") || die "$0: cannot open $inputf for reading/writing: $!";
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133 | binmode($inputfh) || die "binmode failed: $!";
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134 |
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135 | # Source https://www.win.tue.nl/~aeb/linux/fs/fat/fat-1.html
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136 | if (defined $label) {
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137 | # x first bytes are untouched
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138 | $offset = 43 if (($verfs =~ /FAT16/) || ($verfs =~ /FAT12/));
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139 | $offset = 71 if ($verfs =~ /FAT32/);
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140 | $length = 11;
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141 | } elsif (defined $uuid) {
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142 | # x first bytes are untouched
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143 | $offset = 39 if (($verfs =~ /FAT16/) || ($verfs =~ /FAT12/));
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144 | $offset = 67 if ($verfs =~ /FAT32/);
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145 | $length = 4;
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146 | } else {
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147 | die "Nothing to do no label/uuid defined";
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148 | }
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149 |
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150 | if (! seek($inputfh, $offset,0)) {
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151 | die "Unable to seek $inputf: $!";
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152 | }
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153 | # then read the following bytes
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154 | my $size = read($inputfh, $buffer, $length);
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155 | if ($size != $length) {
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156 | die "Unable to read existing label/uuid: $!";
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157 | }
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158 |
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159 | if (defined $label) {
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160 | pb_log(1,"Previous label was ***$buffer***\n");
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161 | } elsif (defined $uuid) {
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162 | my ($hex) = unpack( 'H*', $buffer );
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163 | pb_log(1,"Previous hex was ***$hex***\n");
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164 | my @loc = ($hex =~ m/../g);
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165 | #print Dumper(@loc);
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166 | $hex = join('',reverse(@loc));
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167 | pb_log(1,"Previous uuid was ***$hex***\n");
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168 | } else {
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169 | die "Nothing to do no label/uuid defined";
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170 | }
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171 |
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172 | if (defined $label) {
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173 | $hexlabel=sprintf("%-11s", uc($label));
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174 | pb_log(1,"New label is ***$hexlabel***\n");
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175 | } elsif (defined $uuid) {
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176 | # Remove separator
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177 | $uuid =~ s/-//;
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178 | pb_log(1,"New uuid is ***$uuid***\n");
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179 | my @loc = ($uuid =~ m/../g);
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180 | my $hex = join('',reverse(@loc));
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181 | ($hexlabel) = pack( 'H*', $hex );
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182 | } else {
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183 | die "Nothing to do no label/uuid defined";
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184 | }
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185 | # Go back
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186 | seek($inputfh, $offset,0);
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187 | print $inputfh $hexlabel;
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188 | close($inputfh) || die "couldn't close $inputf: $!";
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