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package IO::BlockSync; |
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3
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# Basic |
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1
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1
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53029
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use 5.010; |
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4
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5
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1
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1
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use strict; |
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1
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30
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6
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use warnings FATAL => 'all'; |
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2
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1
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30
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8
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# Build in |
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4
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use Carp; |
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1
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62
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10
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1
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6
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use Fcntl qw(:DEFAULT :seek); |
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2
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1
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360
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429
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use POSIX qw(ceil); |
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5098
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1
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12
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1
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1262
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use Scalar::Util qw(reftype); |
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2
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1
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47
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14
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# CPAN |
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1
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687
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use Log::Log4perl; |
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38133
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1
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5
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16
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1
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46
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use Log::Log4perl::Level; |
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2
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1
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4
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1
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612
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use Moo; |
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9160
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1
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9
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18
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1
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1
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1736
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use Try::Tiny; |
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1062
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1
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49
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# These two come last - in that order |
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1
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1
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401
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use namespace::clean; |
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7768
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1
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1
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1068
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use Exporter qw(import); |
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2
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1
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1221
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23
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24
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################################################################ |
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26
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# Moo roles to implement |
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with('MooseX::Log::Log4perl'); |
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29
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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') ); |
32
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} |
33
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34
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################################################################ |
35
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36
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=head1 NAME |
37
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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 0.001 |
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44
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=cut |
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46
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our $VERSION = '0.001'; |
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48
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################################################################ |
49
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50
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=head1 SYNOPSIS |
51
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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. |
54
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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. |
57
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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 |
62
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my $bs = IO::BlockSync->new( |
63
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src => '/path/to/source/file', |
64
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dst => '/path/to/destination/file', |
65
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chk => '/path/to/chk/file', |
66
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); |
67
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$bs->run; |
68
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69
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# Non OOP way |
70
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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', |
73
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chk => '/path/to/chk/file', |
74
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); |
75
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76
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=cut |
77
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78
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################################################################ |
79
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80
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=head1 EXPORT |
81
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82
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=cut |
83
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84
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our @EXPORT = qw(BlockSync); |
85
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86
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################################################################ |
87
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88
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=head2 BlockSync |
89
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90
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Run BlockSync non-object-oriented |
91
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92
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=cut |
93
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94
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sub BlockSync { |
95
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0
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0
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1
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return __PACKAGE__->new(@_)->run; |
96
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} |
97
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98
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################################################################ |
99
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100
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=head1 ATTRIBUTES |
101
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102
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=cut |
103
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104
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################################################################ |
105
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106
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=head2 src |
107
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108
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Path to source file. |
109
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110
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mandatory - string (containing path) or filehandle |
111
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112
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=cut |
113
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114
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has 'src' => ( |
115
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is => 'ro', |
116
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required => 1, |
117
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); |
118
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119
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################################################################ |
120
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121
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=head2 dst |
122
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123
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Destination file. If not set, then only checksum file will be updated. |
124
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125
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optional - string (containing path) or filehandle |
126
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127
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=cut |
128
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129
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has 'dst' => ( is => 'ro', ); |
130
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131
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################################################################ |
132
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133
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=head2 chk |
134
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135
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Path to checksum file. |
136
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137
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mandatory - 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 'chk' => ( |
142
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is => 'ro', |
143
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required => 1, |
144
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); |
145
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146
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################################################################ |
147
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148
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=head2 bs |
149
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150
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Block size to use in bytes. |
151
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152
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optional - integer - defaults to 1_048_576 B (1 MB) |
153
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154
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=cut |
155
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156
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has 'bs' => ( |
157
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is => 'ro', |
158
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default => 1_048_576, |
159
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); |
160
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161
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################################################################ |
162
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163
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=head2 hash |
164
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165
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Sub that retrurn hashed data. |
166
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167
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optional - sub - defaults to sub that return MD5 hash followed by newline |
168
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169
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=cut |
170
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171
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has 'hash' => ( |
172
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is => 'ro', |
173
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default => sub { |
174
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require Digest::MD5; |
175
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sub { |
176
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Digest::MD5::md5_hex(shift) . "\n"; |
177
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} |
178
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}, |
179
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); |
180
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181
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################################################################ |
182
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183
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=head2 sparse |
184
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185
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Seek in dst file, instead of writing blocks only containing \0 |
186
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187
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optional - boolean - defaults to 0 (false) |
188
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189
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=cut |
190
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191
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has 'sparse' => ( |
192
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is => 'ro', |
193
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default => 0, |
194
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); |
195
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196
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################################################################ |
197
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198
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=head2 truncate |
199
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200
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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). |
201
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202
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optional - boolean - defaults to 0 (false) |
203
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204
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=cut |
205
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206
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has 'truncate' => ( |
207
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is => 'ro', |
208
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default => 0, |
209
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); |
210
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211
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################################################################ |
212
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213
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=head2 data |
214
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215
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List of areas (in bytes) inside the source file that should be looked at. |
216
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Usefull if you know excactly which blocks in src that could have changed. |
217
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218
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data => [ |
219
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{start => 0, end => 9999}, |
220
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{start => 88888, end => 777777}, |
221
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] |
222
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223
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|
|
optional - array of hashes - defaults to "whole file" |
224
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225
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=cut |
226
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227
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has 'data' => ( |
228
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is => 'ro', |
229
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default => sub { |
230
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[ |
231
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{ |
232
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start => 0, |
233
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end => 0 |
234
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} |
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] |
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}, |
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); |
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################################################################ |
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=head2 status |
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Sub that will be run everytime a block has been read (and written). |
244
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optional - sub - default to sub doing nothing |
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=cut |
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has 'status' => ( |
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is => 'ro', |
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default => sub { |
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sub { } |
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}, |
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); |
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256
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################################################################ |
257
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=head1 METHODS |
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=cut |
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262
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################################################################ |
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264
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=head2 run |
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266
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This is the method that starts copying data. |
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268
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=cut |
269
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270
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sub run { ## no critic (Subroutines::ProhibitExcessComplexity) |
271
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0
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0
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1
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my $self = shift; |
272
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273
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0
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my ( $srcFh, $srcClose, $dstFh, $dstClose, $chkFh, $chkClose ); |
274
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275
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try { |
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# Get file handles for source, destination and checksum files |
277
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0
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0
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$srcFh = $self->_getFh( 'src', $self->src, \$srcClose, O_RDONLY ); |
278
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0
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$chkFh = |
279
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$self->_getFh( 'chk', $self->chk, \$chkClose, O_RDWR | O_CREAT ); |
280
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0
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0
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if ( $self->dst ) { |
281
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0
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$dstFh = $self->_getFh( 'dst', $self->dst, \$dstClose, |
282
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O_WRONLY | O_CREAT ); |
283
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} |
284
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else { |
285
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0
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$self->logger->debug('No dst file, only calculating checksums'); |
286
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} |
287
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288
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# Calculate hash for a block only containing ASCII 0 |
289
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0
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my $nullHash = &{ $self->hash }( "\0" x $self->bs ); |
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0
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290
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291
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# Get number of bytes that a hash takes up |
292
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0
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my $hashSize = length($nullHash); |
293
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294
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0
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my $srcSeek; |
295
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296
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# Loop through "areas" that should be copied |
297
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# Default i one area containing the whole source file |
298
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0
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foreach my $dataBlocks ( @{ $self->data } ) { |
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0
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299
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300
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# Start and end of this "area" (default is $start=0, $end=0) |
301
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0
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|
my $start = $dataBlocks->{start}; |
302
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0
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|
my $end = $dataBlocks->{end}; |
303
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304
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0
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|
$self->logger->debug( |
305
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|
"Going to process data from <$start> to <$end>"); |
306
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307
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|
# Seek to $start |
308
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|
# (or the beginning of the block that $start is in, |
309
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|
# if $start is not aligned with bs) |
310
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0
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|
$srcSeek = int( $start / $self->bs ) * $self->bs; |
311
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0
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0
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|
sysseek( $srcFh, $srcSeek, SEEK_SET ) |
312
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|
|| $self->logger->logcroak( |
313
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|
"Cannot seek to block <$srcSeek> in src file"); |
314
|
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315
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|
|
# Just die! Muhahaha. Or not |
316
|
0
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|
my $die = 0; |
317
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318
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|
# Can be either sparse, new, unchanged or changed |
319
|
0
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|
|
my $status; |
320
|
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321
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|
|
|
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|
|
# Read block from source |
322
|
0
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|
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|
|
|
while ( my $srcReadSize = sysread( $srcFh, my $data, $self->bs ) ) { |
323
|
|
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|
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324
|
|
|
|
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|
|
# It's ok to read a block smaller than bs if it's the last |
325
|
|
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|
|
|
|
# block. But it's not ok if it's not the last. |
326
|
0
|
0
|
|
|
|
|
if ($die) { |
327
|
0
|
|
|
|
|
|
croak 'not reading full block'; |
328
|
|
|
|
|
|
|
} |
329
|
0
|
|
|
|
|
|
$die = $srcReadSize != $self->bs; |
330
|
|
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|
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|
331
|
|
|
|
|
|
|
# $block = block number in source with the specified block size |
332
|
0
|
|
|
|
|
|
my $block = $srcSeek / $self->bs; |
333
|
|
|
|
|
|
|
|
334
|
|
|
|
|
|
|
# We start by assuming that we should write to dst |
335
|
|
|
|
|
|
|
# - if dst is set (= we are not just calculating checksum) |
336
|
0
|
|
|
|
|
|
my $writeData = 1 && $dstFh; |
337
|
|
|
|
|
|
|
|
338
|
|
|
|
|
|
|
# We start be assuming that we should write checksum to chk |
339
|
0
|
|
|
|
|
|
my $writeHash = 1; |
340
|
|
|
|
|
|
|
|
341
|
|
|
|
|
|
|
# Calculate hash for data read from src |
342
|
0
|
|
|
|
|
|
my $newHash = &{ $self->hash }($data); |
|
0
|
|
|
|
|
|
|
343
|
|
|
|
|
|
|
|
344
|
|
|
|
|
|
|
# Get old hash for the same block |
345
|
0
|
0
|
|
|
|
|
sysseek( $chkFh, $block * $hashSize, SEEK_SET ) |
346
|
|
|
|
|
|
|
|| $self->logger->logcroak('Cannot seek in chk file'); |
347
|
0
|
|
|
|
|
|
my $oldHashSize = sysread( $chkFh, my $oldHash, $hashSize ); |
348
|
|
|
|
|
|
|
|
349
|
|
|
|
|
|
|
# Test source against checksum |
350
|
0
|
0
|
0
|
|
|
|
if ( $oldHashSize != $hashSize || $oldHash eq "\0" x $hashSize ) |
|
|
0
|
|
|
|
|
|
351
|
|
|
|
|
|
|
{ |
352
|
0
|
0
|
0
|
|
|
|
if ( $self->sparse && $newHash eq $nullHash ) { |
353
|
|
|
|
|
|
|
|
354
|
|
|
|
|
|
|
# Sparse is only for new blocks |
355
|
|
|
|
|
|
|
# Blocks that have been nulled out in source will |
356
|
|
|
|
|
|
|
# also get nulled out in destination |
357
|
0
|
|
|
|
|
|
$status = 'sparse'; |
358
|
0
|
|
|
|
|
|
$writeData = 0; |
359
|
|
|
|
|
|
|
} |
360
|
|
|
|
|
|
|
else { |
361
|
0
|
|
|
|
|
|
$status = 'new'; |
362
|
|
|
|
|
|
|
} |
363
|
|
|
|
|
|
|
} |
364
|
|
|
|
|
|
|
elsif ( $newHash eq $oldHash ) { |
365
|
0
|
|
|
|
|
|
$status = 'unchanged'; |
366
|
0
|
|
|
|
|
|
$writeData = 0; |
367
|
0
|
|
|
|
|
|
$writeHash = 0; |
368
|
|
|
|
|
|
|
} |
369
|
|
|
|
|
|
|
else { |
370
|
0
|
|
|
|
|
|
$status = 'changed'; |
371
|
|
|
|
|
|
|
} |
372
|
|
|
|
|
|
|
|
373
|
|
|
|
|
|
|
# Write data to destination |
374
|
0
|
0
|
|
|
|
|
if ($writeData) { |
375
|
0
|
0
|
|
|
|
|
sysseek( $dstFh, $srcSeek, SEEK_SET ) |
376
|
|
|
|
|
|
|
|| $self->logger->logcroak('Cannot seek in dst file'); |
377
|
0
|
|
|
|
|
|
syswrite( $dstFh, $data ); |
378
|
|
|
|
|
|
|
} |
379
|
|
|
|
|
|
|
|
380
|
|
|
|
|
|
|
# Update hash in checksum |
381
|
0
|
0
|
|
|
|
|
if ($writeHash) { |
382
|
0
|
0
|
|
|
|
|
sysseek( $chkFh, $block * $hashSize, SEEK_SET ) |
383
|
|
|
|
|
|
|
|| $self->logger->logcroak('Cannot seek in chk file'); |
384
|
0
|
|
|
|
|
|
syswrite( $chkFh, $newHash ); |
385
|
|
|
|
|
|
|
} |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
$self->logger->debug( |
388
|
0
|
|
|
|
|
|
sprintf 'Block <%u> was <%s> (<%u> to <%u>)', |
389
|
|
|
|
|
|
|
$block, $status, $srcSeek, $srcSeek + $srcReadSize - 1 ); |
390
|
0
|
|
|
|
|
|
&{ $self->status } |
|
0
|
|
|
|
|
|
|
391
|
|
|
|
|
|
|
( $block, $status, $srcSeek, $srcSeek + $srcReadSize - 1 ); |
392
|
|
|
|
|
|
|
|
393
|
|
|
|
|
|
|
# Next block will start here |
394
|
0
|
|
|
|
|
|
$srcSeek += $srcReadSize; |
395
|
|
|
|
|
|
|
|
396
|
|
|
|
|
|
|
# Was this the last block in this batch |
397
|
0
|
0
|
0
|
|
|
|
if ( $end && $srcSeek > $end ) { |
398
|
0
|
|
|
|
|
|
last; |
399
|
|
|
|
|
|
|
} |
400
|
|
|
|
|
|
|
} |
401
|
|
|
|
|
|
|
|
402
|
|
|
|
|
|
|
# If last block is sparse, it is not enough to seek to where the |
403
|
|
|
|
|
|
|
# EOF should be. We need to at least write a single \0 |
404
|
0
|
0
|
0
|
|
|
|
if ( $dstFh && $status eq 'sparse' ) { |
405
|
0
|
0
|
|
|
|
|
sysseek( $dstFh, $srcSeek - 1, SEEK_SET ) |
406
|
|
|
|
|
|
|
|| $self->logger->logcroak('Cannot seek in dst file'); |
407
|
0
|
|
|
|
|
|
syswrite( $dstFh, "\0" ); |
408
|
|
|
|
|
|
|
} |
409
|
|
|
|
|
|
|
} |
410
|
|
|
|
|
|
|
|
411
|
0
|
0
|
0
|
|
|
|
if ( $self->truncate |
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
412
|
|
|
|
|
|
|
&& $dstFh |
413
|
|
|
|
|
|
|
&& $srcSeek |
414
|
0
|
|
|
|
|
|
&& @{ $self->data } == 1 |
415
|
|
|
|
|
|
|
&& $self->data->[0]->{start} == 0 |
416
|
|
|
|
|
|
|
&& $self->data->[0]->{end} == 0 ) |
417
|
|
|
|
|
|
|
{ |
418
|
0
|
|
|
|
|
|
$self->logger->debug("Truncating dst file at <$srcSeek>"); |
419
|
0
|
|
|
|
|
|
truncate( $dstFh, $srcSeek ); |
420
|
|
|
|
|
|
|
|
421
|
0
|
|
|
|
|
|
my $chkSeek = ceil( $srcSeek / $self->bs ) * $hashSize; |
422
|
0
|
|
|
|
|
|
$self->logger->debug("Truncating chk file at <$chkSeek>"); |
423
|
0
|
|
|
|
|
|
truncate( $chkFh, $chkSeek ); |
424
|
|
|
|
|
|
|
} |
425
|
|
|
|
|
|
|
|
426
|
|
|
|
|
|
|
} |
427
|
|
|
|
|
|
|
catch { |
428
|
0
|
|
|
0
|
|
|
croak $_; |
429
|
|
|
|
|
|
|
} |
430
|
|
|
|
|
|
|
finally { |
431
|
|
|
|
|
|
|
# If we opened the files (we got string with path), then we close them |
432
|
|
|
|
|
|
|
# if we got a filehandle then we do nothing |
433
|
0
|
0
|
|
0
|
|
|
if ($srcClose) { |
434
|
0
|
|
|
|
|
|
$self->logger->debug( sprintf 'closing src file <%s>', $self->src ); |
435
|
|
|
|
|
|
|
} |
436
|
0
|
0
|
|
|
|
|
if ($dstClose) { |
437
|
0
|
|
|
|
|
|
$self->logger->debug( sprintf 'closing dst file <%s>', $self->dst ); |
438
|
|
|
|
|
|
|
} |
439
|
0
|
0
|
|
|
|
|
if ($chkClose) { |
440
|
0
|
|
|
|
|
|
$self->logger->debug( sprintf 'closing chk file <%s>', $self->chk ); |
441
|
|
|
|
|
|
|
} |
442
|
0
|
|
|
|
|
|
}; |
443
|
|
|
|
|
|
|
|
444
|
|
|
|
|
|
|
# Make Perl::Critic happy |
445
|
0
|
|
|
|
|
|
return; |
446
|
|
|
|
|
|
|
} |
447
|
|
|
|
|
|
|
|
448
|
|
|
|
|
|
|
################################################################ |
449
|
|
|
|
|
|
|
|
450
|
|
|
|
|
|
|
=begin comment |
451
|
|
|
|
|
|
|
|
452
|
|
|
|
|
|
|
Private |
453
|
|
|
|
|
|
|
Get file handle |
454
|
|
|
|
|
|
|
|
455
|
|
|
|
|
|
|
=end comment |
456
|
|
|
|
|
|
|
|
457
|
|
|
|
|
|
|
=cut |
458
|
|
|
|
|
|
|
|
459
|
|
|
|
|
|
|
sub _getFh { |
460
|
0
|
|
|
0
|
|
|
my ( $self, $name, $file, $closeFile, $mode ) = @_; |
461
|
|
|
|
|
|
|
|
462
|
0
|
0
|
|
|
|
|
if ( my $t = reftype($file) ) { |
463
|
0
|
0
|
|
|
|
|
if ( $t eq 'GLOB' ) { |
464
|
0
|
|
|
|
|
|
$self->logger->debug( |
465
|
|
|
|
|
|
|
sprintf '%s is a file handle, using that directly', $name ); |
466
|
0
|
|
|
|
|
|
return $file; |
467
|
|
|
|
|
|
|
} |
468
|
|
|
|
|
|
|
else { |
469
|
0
|
|
|
|
|
|
$self->logger->logcroak( |
470
|
|
|
|
|
|
|
sprintf '<%s> is not a supported type for %s', |
471
|
|
|
|
|
|
|
$t, $name ); |
472
|
|
|
|
|
|
|
} |
473
|
|
|
|
|
|
|
} |
474
|
|
|
|
|
|
|
else { |
475
|
0
|
|
|
|
|
|
$self->logger->debug( sprintf 'opening %s file <%s>', $name, $file ); |
476
|
0
|
0
|
|
|
|
|
sysopen( my $fh, $file, $mode ) |
477
|
|
|
|
|
|
|
|| $self->logger->logcroak( sprintf 'error opening <%s>', $file ); |
478
|
0
|
|
|
|
|
|
${$closeFile} = 1; |
|
0
|
|
|
|
|
|
|
479
|
0
|
|
|
|
|
|
return $fh; |
480
|
|
|
|
|
|
|
} |
481
|
|
|
|
|
|
|
|
482
|
|
|
|
|
|
|
# Make Perl::Critic happy |
483
|
0
|
|
|
|
|
|
croak 'We should never end here!'; |
484
|
|
|
|
|
|
|
} |
485
|
|
|
|
|
|
|
|
486
|
|
|
|
|
|
|
################################################################ |
487
|
|
|
|
|
|
|
|
488
|
|
|
|
|
|
|
=head1 LICENSE AND COPYRIGHT |
489
|
|
|
|
|
|
|
|
490
|
|
|
|
|
|
|
This software is copyright (c) 2019 by Thor Dreier-Hansen. |
491
|
|
|
|
|
|
|
|
492
|
|
|
|
|
|
|
This is free software; you can redistribute it and/or modify it under |
493
|
|
|
|
|
|
|
the same terms as the Perl 5 programming language system itself. |
494
|
|
|
|
|
|
|
|
495
|
|
|
|
|
|
|
Terms of the Perl programming language system itself: |
496
|
|
|
|
|
|
|
|
497
|
|
|
|
|
|
|
=over |
498
|
|
|
|
|
|
|
|
499
|
|
|
|
|
|
|
=item * the |
500
|
|
|
|
|
|
|
L<GNU General Public License|http://dev.perl.org/licenses/gpl1.html> |
501
|
|
|
|
|
|
|
as published by the Free Software Foundation; either |
502
|
|
|
|
|
|
|
L<version 1|http://dev.perl.org/licenses/gpl1.html>, |
503
|
|
|
|
|
|
|
or (at your option) any later version, or |
504
|
|
|
|
|
|
|
|
505
|
|
|
|
|
|
|
=item * the L<"Artistic License"|http://dev.perl.org/licenses/artistic.html> |
506
|
|
|
|
|
|
|
|
507
|
|
|
|
|
|
|
=back |
508
|
|
|
|
|
|
|
|
509
|
|
|
|
|
|
|
See L<http://dev.perl.org/licenses/> for more information. |
510
|
|
|
|
|
|
|
|
511
|
|
|
|
|
|
|
=cut |
512
|
|
|
|
|
|
|
|
513
|
|
|
|
|
|
|
1; # End of IO::BlockSync |