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package IO::BlockSync; |
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# Basic |
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64680
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use 5.010; |
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use strict; |
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use warnings FATAL => 'all'; |
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# Build in |
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use Carp; |
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use Fcntl qw(:DEFAULT :seek); |
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425
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use POSIX qw(ceil); |
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6187
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use Scalar::Util qw(reftype); |
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# CPAN |
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use Log::Log4perl; |
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45528
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use Log::Log4perl::Level; |
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use Moo; |
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11507
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use Try::Tiny; |
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1269
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# These two come last - in that order |
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use namespace::clean; |
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9241
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1321
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use Exporter qw(import); |
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1454
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################################################################ |
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# Moo roles to implement |
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with('MooseX::Log::Log4perl'); |
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# Make sure log4perl doesn't come with errors |
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if ( not Log::Log4perl->initialized() ) { |
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Log::Log4perl->easy_init( Log::Log4perl::Level::to_priority('OFF') ); |
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} |
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################################################################ |
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=head1 NAME |
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38
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IO::BlockSync - Syncronize changed blocks |
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40
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=head1 VERSION |
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42
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Version 0.002 |
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=cut |
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46
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our $VERSION = '0.002'; |
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48
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################################################################ |
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50
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=head1 SYNOPSIS |
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52
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BlockSync can some of the same stuff that bigsync (by Egor Egorov) can |
53
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- it's just written in perl. |
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55
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BlockSync copies data from source file to destination file (can be a block |
56
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device) and calculates checksum on each block it copies. |
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On all runs after the first only the changed blocks will be copied. |
58
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59
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use IO::BlockSync; |
60
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61
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# OOP way |
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my $bs = IO::BlockSync->new( |
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src => '/path/to/source/file', |
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dst => '/path/to/destination/file', |
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chk => '/path/to/chk/file', |
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); |
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$bs->run; |
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69
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# Non OOP way |
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BlockSync( |
71
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src => '/path/to/source/file', |
72
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dst => '/path/to/destination/file', |
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chk => '/path/to/chk/file', |
74
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); |
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=cut |
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78
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################################################################ |
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80
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=head1 INSTALLATION |
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82
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Look in C<README.pod> |
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84
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Can also be found on |
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L<GitHub|https://github.com/thordreier/perl-IO-BlockSync/blob/master/README.pod> |
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or L<meta::cpan|https://metacpan.org/pod/distribution/IO-BlockSync/README.pod> |
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88
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=cut |
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90
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################################################################ |
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92
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=head1 EXPORT |
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94
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=cut |
95
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96
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our @EXPORT = qw(BlockSync); |
97
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98
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################################################################ |
99
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100
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=head2 BlockSync |
101
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102
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Run BlockSync non-object-oriented |
103
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104
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=cut |
105
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106
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sub BlockSync { |
107
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0
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0
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1
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return __PACKAGE__->new(@_)->run; |
108
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} |
109
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110
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################################################################ |
111
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112
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=head1 ATTRIBUTES |
113
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114
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=cut |
115
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116
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################################################################ |
117
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118
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=head2 src |
119
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120
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Path to source file. |
121
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122
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mandatory - string (containing path) or filehandle |
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124
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=cut |
125
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126
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has 'src' => ( |
127
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is => 'ro', |
128
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required => 1, |
129
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); |
130
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131
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################################################################ |
132
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133
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=head2 dst |
134
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135
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Destination file. If not set, then only checksum file will be updated. |
136
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137
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optional - string (containing path) or filehandle |
138
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139
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=cut |
140
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141
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has 'dst' => ( is => 'ro', ); |
142
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143
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################################################################ |
144
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145
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=head2 chk |
146
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147
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Path to checksum file. |
148
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149
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mandatory - string (containing path) or filehandle |
150
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151
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=cut |
152
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153
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has 'chk' => ( |
154
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is => 'ro', |
155
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required => 1, |
156
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); |
157
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158
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################################################################ |
159
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160
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=head2 bs |
161
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162
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Block size to use in bytes. |
163
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164
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optional - integer - defaults to 1_048_576 B (1 MB) |
165
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166
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=cut |
167
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168
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has 'bs' => ( |
169
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is => 'ro', |
170
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default => 1_048_576, |
171
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); |
172
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173
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################################################################ |
174
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175
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=head2 hash |
176
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177
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Sub that retrurn hashed data. |
178
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179
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optional - sub - defaults to sub that return MD5 hash followed by newline |
180
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181
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=cut |
182
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183
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has 'hash' => ( |
184
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is => 'ro', |
185
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default => sub { |
186
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require Digest::MD5; |
187
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sub { |
188
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Digest::MD5::md5_hex(shift) . "\n"; |
189
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} |
190
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}, |
191
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); |
192
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193
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################################################################ |
194
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195
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=head2 sparse |
196
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197
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Seek in dst file, instead of writing blocks only containing \0 |
198
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199
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optional - boolean - defaults to 0 (false) |
200
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201
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=cut |
202
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203
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has 'sparse' => ( |
204
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is => 'ro', |
205
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default => 0, |
206
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); |
207
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208
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################################################################ |
209
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210
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=head2 truncate |
211
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212
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Truncate the destination file to same size as source file. Does not work on block devices. Will only be tried if C<data> has default value (whole file is copied). |
213
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214
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optional - boolean - defaults to 0 (false) |
215
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216
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=cut |
217
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218
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has 'truncate' => ( |
219
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is => 'ro', |
220
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default => 0, |
221
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); |
222
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223
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################################################################ |
224
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225
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=head2 data |
226
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227
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List of areas (in bytes) inside the source file that should be looked at. |
228
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Usefull if you know excactly which blocks in src that could have changed. |
229
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230
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data => [ |
231
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{start => 0, end => 9999}, |
232
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{start => 88888, end => 777777}, |
233
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] |
234
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235
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optional - array of hashes - defaults to "whole file" |
236
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237
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=cut |
238
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239
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has 'data' => ( |
240
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is => 'ro', |
241
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default => sub { |
242
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[ |
243
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{ |
244
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start => 0, |
245
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end => 0 |
246
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} |
247
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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
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253
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=head2 status |
254
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255
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Sub that will be run everytime a block has been read (and written). |
256
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257
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optional - sub - default to sub doing nothing |
258
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259
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=cut |
260
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261
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has 'status' => ( |
262
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is => 'ro', |
263
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default => sub { |
264
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sub { } |
265
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}, |
266
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); |
267
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268
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################################################################ |
269
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270
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=head1 METHODS |
271
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272
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=cut |
273
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274
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################################################################ |
275
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276
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=head2 run |
277
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278
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This is the method that starts copying data. |
279
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280
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=cut |
281
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282
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|
sub run { ## no critic (Subroutines::ProhibitExcessComplexity) |
283
|
0
|
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|
0
|
1
|
|
my $self = shift; |
284
|
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285
|
0
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|
my ( $srcFh, $srcClose, $dstFh, $dstClose, $chkFh, $chkClose ); |
286
|
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287
|
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|
try { |
288
|
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|
|
# Get file handles for source, destination and checksum files |
289
|
0
|
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|
0
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|
|
$srcFh = $self->_getFh( 'src', $self->src, \$srcClose, O_RDONLY ); |
290
|
0
|
|
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|
|
|
$chkFh = |
291
|
|
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|
|
$self->_getFh( 'chk', $self->chk, \$chkClose, O_RDWR | O_CREAT ); |
292
|
0
|
0
|
|
|
|
|
if ( $self->dst ) { |
293
|
0
|
|
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|
|
|
$dstFh = $self->_getFh( 'dst', $self->dst, \$dstClose, |
294
|
|
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|
O_WRONLY | O_CREAT ); |
295
|
|
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|
|
|
} |
296
|
|
|
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|
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|
else { |
297
|
0
|
|
|
|
|
|
$self->logger->debug('No dst file, only calculating checksums'); |
298
|
|
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|
|
|
} |
299
|
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|
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|
300
|
|
|
|
|
|
|
# Calculate hash for a block only containing ASCII 0 |
301
|
0
|
|
|
|
|
|
my $nullHash = &{ $self->hash }( "\0" x $self->bs ); |
|
0
|
|
|
|
|
|
|
302
|
|
|
|
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|
|
|
303
|
|
|
|
|
|
|
# Get number of bytes that a hash takes up |
304
|
0
|
|
|
|
|
|
my $hashSize = length($nullHash); |
305
|
|
|
|
|
|
|
|
306
|
0
|
|
|
|
|
|
my $srcSeek; |
307
|
|
|
|
|
|
|
|
308
|
|
|
|
|
|
|
# Loop through "areas" that should be copied |
309
|
|
|
|
|
|
|
# Default i one area containing the whole source file |
310
|
0
|
|
|
|
|
|
foreach my $dataBlocks ( @{ $self->data } ) { |
|
0
|
|
|
|
|
|
|
311
|
|
|
|
|
|
|
|
312
|
|
|
|
|
|
|
# Start and end of this "area" (default is $start=0, $end=0) |
313
|
0
|
|
|
|
|
|
my $start = $dataBlocks->{start}; |
314
|
0
|
|
|
|
|
|
my $end = $dataBlocks->{end}; |
315
|
|
|
|
|
|
|
|
316
|
0
|
|
|
|
|
|
$self->logger->debug( |
317
|
|
|
|
|
|
|
"Going to process data from <$start> to <$end>"); |
318
|
|
|
|
|
|
|
|
319
|
|
|
|
|
|
|
# Seek to $start |
320
|
|
|
|
|
|
|
# (or the beginning of the block that $start is in, |
321
|
|
|
|
|
|
|
# if $start is not aligned with bs) |
322
|
0
|
|
|
|
|
|
$srcSeek = int( $start / $self->bs ) * $self->bs; |
323
|
0
|
0
|
|
|
|
|
sysseek( $srcFh, $srcSeek, SEEK_SET ) |
324
|
|
|
|
|
|
|
|| $self->logger->logcroak( |
325
|
|
|
|
|
|
|
"Cannot seek to block <$srcSeek> in src file"); |
326
|
|
|
|
|
|
|
|
327
|
|
|
|
|
|
|
# Just die! Muhahaha. Or not |
328
|
0
|
|
|
|
|
|
my $die = 0; |
329
|
|
|
|
|
|
|
|
330
|
|
|
|
|
|
|
# Can be either sparse, new, unchanged or changed |
331
|
0
|
|
|
|
|
|
my $status; |
332
|
|
|
|
|
|
|
|
333
|
|
|
|
|
|
|
# Read block from source |
334
|
0
|
|
|
|
|
|
while ( my $srcReadSize = sysread( $srcFh, my $data, $self->bs ) ) { |
335
|
|
|
|
|
|
|
|
336
|
|
|
|
|
|
|
# It's ok to read a block smaller than bs if it's the last |
337
|
|
|
|
|
|
|
# block. But it's not ok if it's not the last. |
338
|
0
|
0
|
|
|
|
|
if ($die) { |
339
|
0
|
|
|
|
|
|
croak 'not reading full block'; |
340
|
|
|
|
|
|
|
} |
341
|
0
|
|
|
|
|
|
$die = $srcReadSize != $self->bs; |
342
|
|
|
|
|
|
|
|
343
|
|
|
|
|
|
|
# $block = block number in source with the specified block size |
344
|
0
|
|
|
|
|
|
my $block = $srcSeek / $self->bs; |
345
|
|
|
|
|
|
|
|
346
|
|
|
|
|
|
|
# We start by assuming that we should write to dst |
347
|
|
|
|
|
|
|
# - if dst is set (= we are not just calculating checksum) |
348
|
0
|
|
|
|
|
|
my $writeData = 1 && $dstFh; |
349
|
|
|
|
|
|
|
|
350
|
|
|
|
|
|
|
# We start be assuming that we should write checksum to chk |
351
|
0
|
|
|
|
|
|
my $writeHash = 1; |
352
|
|
|
|
|
|
|
|
353
|
|
|
|
|
|
|
# Calculate hash for data read from src |
354
|
0
|
|
|
|
|
|
my $newHash = &{ $self->hash }($data); |
|
0
|
|
|
|
|
|
|
355
|
|
|
|
|
|
|
|
356
|
|
|
|
|
|
|
# Get old hash for the same block |
357
|
0
|
0
|
|
|
|
|
sysseek( $chkFh, $block * $hashSize, SEEK_SET ) |
358
|
|
|
|
|
|
|
|| $self->logger->logcroak('Cannot seek in chk file'); |
359
|
0
|
|
|
|
|
|
my $oldHashSize = sysread( $chkFh, my $oldHash, $hashSize ); |
360
|
|
|
|
|
|
|
|
361
|
|
|
|
|
|
|
# Test source against checksum |
362
|
0
|
0
|
0
|
|
|
|
if ( $oldHashSize != $hashSize || $oldHash eq "\0" x $hashSize ) |
|
|
0
|
|
|
|
|
|
363
|
|
|
|
|
|
|
{ |
364
|
0
|
0
|
0
|
|
|
|
if ( $self->sparse && $newHash eq $nullHash ) { |
365
|
|
|
|
|
|
|
|
366
|
|
|
|
|
|
|
# Sparse is only for new blocks |
367
|
|
|
|
|
|
|
# Blocks that have been nulled out in source will |
368
|
|
|
|
|
|
|
# also get nulled out in destination |
369
|
0
|
|
|
|
|
|
$status = 'sparse'; |
370
|
0
|
|
|
|
|
|
$writeData = 0; |
371
|
|
|
|
|
|
|
} |
372
|
|
|
|
|
|
|
else { |
373
|
0
|
|
|
|
|
|
$status = 'new'; |
374
|
|
|
|
|
|
|
} |
375
|
|
|
|
|
|
|
} |
376
|
|
|
|
|
|
|
elsif ( $newHash eq $oldHash ) { |
377
|
0
|
|
|
|
|
|
$status = 'unchanged'; |
378
|
0
|
|
|
|
|
|
$writeData = 0; |
379
|
0
|
|
|
|
|
|
$writeHash = 0; |
380
|
|
|
|
|
|
|
} |
381
|
|
|
|
|
|
|
else { |
382
|
0
|
|
|
|
|
|
$status = 'changed'; |
383
|
|
|
|
|
|
|
} |
384
|
|
|
|
|
|
|
|
385
|
|
|
|
|
|
|
# Write data to destination |
386
|
0
|
0
|
|
|
|
|
if ($writeData) { |
387
|
0
|
0
|
|
|
|
|
sysseek( $dstFh, $srcSeek, SEEK_SET ) |
388
|
|
|
|
|
|
|
|| $self->logger->logcroak('Cannot seek in dst file'); |
389
|
0
|
|
|
|
|
|
syswrite( $dstFh, $data ); |
390
|
|
|
|
|
|
|
} |
391
|
|
|
|
|
|
|
|
392
|
|
|
|
|
|
|
# Update hash in checksum |
393
|
0
|
0
|
|
|
|
|
if ($writeHash) { |
394
|
0
|
0
|
|
|
|
|
sysseek( $chkFh, $block * $hashSize, SEEK_SET ) |
395
|
|
|
|
|
|
|
|| $self->logger->logcroak('Cannot seek in chk file'); |
396
|
0
|
|
|
|
|
|
syswrite( $chkFh, $newHash ); |
397
|
|
|
|
|
|
|
} |
398
|
|
|
|
|
|
|
|
399
|
|
|
|
|
|
|
$self->logger->debug( |
400
|
0
|
|
|
|
|
|
sprintf 'Block <%u> was <%s> (<%u> to <%u>)', |
401
|
|
|
|
|
|
|
$block, $status, $srcSeek, $srcSeek + $srcReadSize - 1 ); |
402
|
0
|
|
|
|
|
|
&{ $self->status } |
|
0
|
|
|
|
|
|
|
403
|
|
|
|
|
|
|
( $block, $status, $srcSeek, $srcSeek + $srcReadSize - 1 ); |
404
|
|
|
|
|
|
|
|
405
|
|
|
|
|
|
|
# Next block will start here |
406
|
0
|
|
|
|
|
|
$srcSeek += $srcReadSize; |
407
|
|
|
|
|
|
|
|
408
|
|
|
|
|
|
|
# Was this the last block in this batch |
409
|
0
|
0
|
0
|
|
|
|
if ( $end && $srcSeek > $end ) { |
410
|
0
|
|
|
|
|
|
last; |
411
|
|
|
|
|
|
|
} |
412
|
|
|
|
|
|
|
} |
413
|
|
|
|
|
|
|
|
414
|
|
|
|
|
|
|
# If last block is sparse, it is not enough to seek to where the |
415
|
|
|
|
|
|
|
# EOF should be. We need to at least write a single \0 |
416
|
0
|
0
|
0
|
|
|
|
if ( $dstFh && $status eq 'sparse' ) { |
417
|
0
|
0
|
|
|
|
|
sysseek( $dstFh, $srcSeek - 1, SEEK_SET ) |
418
|
|
|
|
|
|
|
|| $self->logger->logcroak('Cannot seek in dst file'); |
419
|
0
|
|
|
|
|
|
syswrite( $dstFh, "\0" ); |
420
|
|
|
|
|
|
|
} |
421
|
|
|
|
|
|
|
} |
422
|
|
|
|
|
|
|
|
423
|
0
|
0
|
0
|
|
|
|
if ( $self->truncate |
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
424
|
|
|
|
|
|
|
&& $dstFh |
425
|
|
|
|
|
|
|
&& $srcSeek |
426
|
0
|
|
|
|
|
|
&& @{ $self->data } == 1 |
427
|
|
|
|
|
|
|
&& $self->data->[0]->{start} == 0 |
428
|
|
|
|
|
|
|
&& $self->data->[0]->{end} == 0 ) |
429
|
|
|
|
|
|
|
{ |
430
|
0
|
|
|
|
|
|
$self->logger->debug("Truncating dst file at <$srcSeek>"); |
431
|
0
|
|
|
|
|
|
truncate( $dstFh, $srcSeek ); |
432
|
|
|
|
|
|
|
|
433
|
0
|
|
|
|
|
|
my $chkSeek = ceil( $srcSeek / $self->bs ) * $hashSize; |
434
|
0
|
|
|
|
|
|
$self->logger->debug("Truncating chk file at <$chkSeek>"); |
435
|
0
|
|
|
|
|
|
truncate( $chkFh, $chkSeek ); |
436
|
|
|
|
|
|
|
} |
437
|
|
|
|
|
|
|
|
438
|
|
|
|
|
|
|
} |
439
|
|
|
|
|
|
|
catch { |
440
|
0
|
|
|
0
|
|
|
croak $_; |
441
|
|
|
|
|
|
|
} |
442
|
|
|
|
|
|
|
finally { |
443
|
|
|
|
|
|
|
# If we opened the files (we got string with path), then we close them |
444
|
|
|
|
|
|
|
# if we got a filehandle then we do nothing |
445
|
0
|
0
|
|
0
|
|
|
if ($srcClose) { |
446
|
0
|
|
|
|
|
|
$self->logger->debug( sprintf 'closing src file <%s>', $self->src ); |
447
|
|
|
|
|
|
|
} |
448
|
0
|
0
|
|
|
|
|
if ($dstClose) { |
449
|
0
|
|
|
|
|
|
$self->logger->debug( sprintf 'closing dst file <%s>', $self->dst ); |
450
|
|
|
|
|
|
|
} |
451
|
0
|
0
|
|
|
|
|
if ($chkClose) { |
452
|
0
|
|
|
|
|
|
$self->logger->debug( sprintf 'closing chk file <%s>', $self->chk ); |
453
|
|
|
|
|
|
|
} |
454
|
0
|
|
|
|
|
|
}; |
455
|
|
|
|
|
|
|
|
456
|
|
|
|
|
|
|
# Make Perl::Critic happy |
457
|
0
|
|
|
|
|
|
return; |
458
|
|
|
|
|
|
|
} |
459
|
|
|
|
|
|
|
|
460
|
|
|
|
|
|
|
################################################################ |
461
|
|
|
|
|
|
|
|
462
|
|
|
|
|
|
|
=begin comment |
463
|
|
|
|
|
|
|
|
464
|
|
|
|
|
|
|
Private |
465
|
|
|
|
|
|
|
Get file handle |
466
|
|
|
|
|
|
|
|
467
|
|
|
|
|
|
|
=end comment |
468
|
|
|
|
|
|
|
|
469
|
|
|
|
|
|
|
=cut |
470
|
|
|
|
|
|
|
|
471
|
|
|
|
|
|
|
sub _getFh { |
472
|
0
|
|
|
0
|
|
|
my ( $self, $name, $file, $closeFile, $mode ) = @_; |
473
|
|
|
|
|
|
|
|
474
|
0
|
0
|
|
|
|
|
if ( my $t = reftype($file) ) { |
475
|
0
|
0
|
|
|
|
|
if ( $t eq 'GLOB' ) { |
476
|
0
|
|
|
|
|
|
$self->logger->debug( |
477
|
|
|
|
|
|
|
sprintf '%s is a file handle, using that directly', $name ); |
478
|
0
|
|
|
|
|
|
return $file; |
479
|
|
|
|
|
|
|
} |
480
|
|
|
|
|
|
|
else { |
481
|
0
|
|
|
|
|
|
$self->logger->logcroak( |
482
|
|
|
|
|
|
|
sprintf '<%s> is not a supported type for %s', |
483
|
|
|
|
|
|
|
$t, $name ); |
484
|
|
|
|
|
|
|
} |
485
|
|
|
|
|
|
|
} |
486
|
|
|
|
|
|
|
else { |
487
|
0
|
|
|
|
|
|
$self->logger->debug( sprintf 'opening %s file <%s>', $name, $file ); |
488
|
0
|
0
|
|
|
|
|
sysopen( my $fh, $file, $mode ) |
489
|
|
|
|
|
|
|
|| $self->logger->logcroak( sprintf 'error opening <%s>', $file ); |
490
|
0
|
|
|
|
|
|
${$closeFile} = 1; |
|
0
|
|
|
|
|
|
|
491
|
0
|
|
|
|
|
|
return $fh; |
492
|
|
|
|
|
|
|
} |
493
|
|
|
|
|
|
|
|
494
|
|
|
|
|
|
|
# Make Perl::Critic happy |
495
|
0
|
|
|
|
|
|
croak 'We should never end here!'; |
496
|
|
|
|
|
|
|
} |
497
|
|
|
|
|
|
|
|
498
|
|
|
|
|
|
|
################################################################ |
499
|
|
|
|
|
|
|
|
500
|
|
|
|
|
|
|
=head1 LICENSE AND COPYRIGHT |
501
|
|
|
|
|
|
|
|
502
|
|
|
|
|
|
|
This software is copyright (c) 2019 by Thor Dreier-Hansen. |
503
|
|
|
|
|
|
|
|
504
|
|
|
|
|
|
|
This is free software; you can redistribute it and/or modify it under |
505
|
|
|
|
|
|
|
the same terms as the Perl 5 programming language system itself. |
506
|
|
|
|
|
|
|
|
507
|
|
|
|
|
|
|
Terms of the Perl programming language system itself: |
508
|
|
|
|
|
|
|
|
509
|
|
|
|
|
|
|
=over |
510
|
|
|
|
|
|
|
|
511
|
|
|
|
|
|
|
=item * the |
512
|
|
|
|
|
|
|
L<GNU General Public License|http://dev.perl.org/licenses/gpl1.html> |
513
|
|
|
|
|
|
|
as published by the Free Software Foundation; either |
514
|
|
|
|
|
|
|
L<version 1|http://dev.perl.org/licenses/gpl1.html>, |
515
|
|
|
|
|
|
|
or (at your option) any later version, or |
516
|
|
|
|
|
|
|
|
517
|
|
|
|
|
|
|
=item * the L<"Artistic License"|http://dev.perl.org/licenses/artistic.html> |
518
|
|
|
|
|
|
|
|
519
|
|
|
|
|
|
|
=back |
520
|
|
|
|
|
|
|
|
521
|
|
|
|
|
|
|
See L<http://dev.perl.org/licenses/> for more information. |
522
|
|
|
|
|
|
|
|
523
|
|
|
|
|
|
|
=cut |
524
|
|
|
|
|
|
|
|
525
|
|
|
|
|
|
|
1; # End of IO::BlockSync |