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package IPC::Capture; |
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1155
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use base qw( Class::Base ); |
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1034
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=head1 NAME |
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IPC::Capture - portably run external apps and capture the output |
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=head1 SYNOPSIS |
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use IPC::Capture; |
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my $ich = IPC::Capture->new(); |
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$ich->set_filter('stdout_only'); |
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my $output = $ich->run( $this_cmd ); |
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if ( $output ) ) { |
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# work with $output... |
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} |
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unless( $ich->can_run( $another_cmd ) { |
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die "Will not be able to run the external command: $another_cmd\n"; |
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} |
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$ich->set_filter('stderr_only'); |
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my $errors = $ich->run( $another_cmd ); |
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# stdout and stderr together: |
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$ich->set_filter('all_output'); |
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my $all = $ich->run( $another_cmd ); |
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=head1 DESCRIPTION |
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IPC::Capture is a module for running external applications |
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in a portable fashion when you're primarily interested in capturing |
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the returned output. |
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Essentially this is an attempt at creating a portable way of doing |
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"backticks" with io-redirection. In fact, if it looks like it will work, |
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this module will internally just try to run the command via a sub-shell |
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invoked by qx; otherwise, it will try some other approaches which may work |
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(going through other modules such as L, L, and/or |
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L). |
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The different ways of running external commands are called "ways" here |
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(because words like "methods" already have too many other associations). |
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At present, there are only two "ways" defined in this module: "qx" and |
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"ipc_cmd". We probe the system trying each of the known ways (in the |
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order defined in the "ways" attribute), and use the first one that looks |
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like it will work. |
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=head2 METHODS |
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=over |
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=cut |
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1485
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use 5.008; |
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use strict; |
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use warnings; |
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use Carp; |
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2
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1
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79
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use Data::Dumper; |
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2
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1
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60
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963
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use Hash::Util qw( lock_keys unlock_keys ); |
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5202
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1
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8
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161
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use File::Spec qw( devnull ); |
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5
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1
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1
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1399
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use File::Temp qw( tempfile tempdir ); |
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27838
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1
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86
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66
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# Note: IPC::Cmd is used below dynamically (if qx fails) |
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1
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1
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1225
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use List::MoreUtils qw( zip ); |
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2479
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1
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1699
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68
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69
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our $VERSION = '0.06'; |
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my $DEBUG = 0; # TODO change to 0 before shipping |
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72
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# needed for accessor generation |
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our $AUTOLOAD; |
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my %ATTRIBUTES = (); |
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76
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=item new |
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Creates a new IPC::Capture object. |
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Takes a hashref as an argument, with named fields identical |
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to the names of the object attributes (which also may be set |
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later via the accessor methods). These attributes are: |
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84
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=over |
85
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86
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=item filter |
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88
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The "filter" is a code that specifies what command output |
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streams we're interested in capturing. Allowed values: |
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91
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=over |
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93
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=item stdout_only |
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Discards stderr and returns only stdout. Like the Bourne shell |
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redirect: '2>/dev/null' |
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=item stderr_only |
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100
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Discards stdout and returns only stderr. Like the Bourne shell |
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redirect: '2>&1 1>/dev/null' |
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103
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=item all_output |
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105
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Intermixes lines of stdout and stderr in chronological order. |
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Like the Bourne shell redirect: '2>&1' |
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108
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=item all_separated |
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The return will be an array reference with two elements: stdout and stderr. |
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(But under some circumstances, it may not be possible to seperate |
112
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the two, and all output will be returned intermixed, as the first |
113
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item, and the second will be undef.) |
114
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115
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=back |
116
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117
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=item autochomp |
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Set to a true value, causes all returned values to be |
120
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automatically chomped. Defaults to false. |
121
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122
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=item known_ways |
123
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124
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List of known ways of invoking external commands, in the default |
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order in which they'll be tried (as of this writing: ['ex', 'ipc_cmd']. |
126
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127
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=item ways |
128
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129
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List of ways of invoking external commands, in the order the user |
130
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would like to try them. Defaults to L. |
131
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132
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=item way |
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134
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The chosen "way" that will be used for invoking external commands. |
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136
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=item stdout_probe_messages |
137
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138
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List of messages which are sent to STDOUT by the probe sub-script. |
139
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An array reference. |
140
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141
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=item stderr_probe_messages |
142
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143
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List of messages which are sent to STDERR by the probe sub-script. |
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An array reference. |
145
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146
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=back |
147
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148
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Takes an optional hashref as an argument, with named fields |
149
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identical to the names of the object attributes. |
150
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151
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=cut |
152
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153
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# Note: "new" is inherited from Class::Base and |
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# calls the following "init" routine automatically. |
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156
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=item init |
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158
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Method that initializes object attributes and then locks them |
159
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down to prevent accidental creation of new ones. |
160
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161
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Any class that inherits from this one should have an B of |
162
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it's own that calls this B. Otherwise, it's an internally |
163
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used routine that is not of much interest to client coders. |
164
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165
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=cut |
166
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167
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sub init { |
168
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3
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3
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1
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5889
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my $self = shift; |
169
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3
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8
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my $args = shift; |
170
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3
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12
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unlock_keys( %{ $self } ); |
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32
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171
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172
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3
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68
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my @attributes = qw( |
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filter |
174
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175
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autochomp |
176
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177
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known_ways |
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ways |
179
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way |
180
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181
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known_filters |
182
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183
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stdout_probe_messages |
184
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stderr_probe_messages |
185
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186
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success |
187
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); |
188
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189
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3
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9
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foreach my $field (@attributes) { |
190
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27
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56
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$ATTRIBUTES{ $field } = 1; |
191
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27
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61
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$self->{ $field } = $args->{ $field }; |
192
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} |
193
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194
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3
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8
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$self->{ success } = 1; ### TODO stub. |
195
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196
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3
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12
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$self->{ known_ways } = ['qx', 'ipc_cmd']; |
197
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3
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33
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27
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$self->{ ways } ||= $self->{ known_ways }; |
198
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199
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$self->{ known_filters } = |
200
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[ |
201
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3
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12
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'stdout_only', |
202
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'stderr_only', |
203
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'all_output', |
204
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'all_separated', |
205
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]; |
206
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207
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$self->{ stdout_probe_messages } ||= |
208
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3
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50
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31
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[ 'abc', 'ijk', 'xyz' ]; |
209
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210
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$self->{ stderr_probe_messages } ||= |
211
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3
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50
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26
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[ '123', '567', '890' ]; |
212
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213
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3
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11
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my $way = $self->probe_system; |
214
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3
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50
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10
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unless( $way ) { |
215
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0
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0
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$self->debug("IPC::Capture probe_system method has not found a way."); |
216
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} |
217
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3
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50
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23
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$self->{ way } = $way || 'qx'; # TODO should there be a fallback default here? |
218
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219
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3
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50
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12
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$self->debugging( 1 ) if $DEBUG; |
220
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3
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50
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105
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$DEBUG = 1 if $self->debugging(); |
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222
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3
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56
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lock_keys( %{ $self } ); |
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41
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223
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3
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142
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return $self; |
224
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} |
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# Note: logically, known_ways and known_filters |
226
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# could be class data: but I don't think I care. |
227
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228
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=item probe_system |
229
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230
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Internally used during the init phase of object creation. |
231
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Chooses a good "way" of running commands external to perl. |
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233
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=cut |
234
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235
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sub probe_system { |
236
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3
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1
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6
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my $self = shift; |
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3
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my $ways = $self->ways; |
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## Here we use File::Temp to write out a small perl script that sends |
240
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## some known output to stdout and (optionally) to stderr |
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3
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my $code = $self->define_yammer_script(); |
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# creating a temporary perl script file |
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# Note: we explicitly use tmpdir, or else it uses curdir which may not be writable(!) |
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3
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201
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my $tmpdir = File::Spec->tmpdir(); |
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3
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50
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15
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$File::Temp::KEEP_ALL = 1 if $DEBUG; # overrides "UNLINK" & leaves tempfile |
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3
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37
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my ($fh1, $scriptname) = tempfile('yap_XXXX', |
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SUFFIX => '.pl', |
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DIR => $tmpdir, |
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UNLINK => 1 ); |
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3
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2161
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$self->debug( "scriptname: $scriptname\n" ); |
253
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3
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29
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print {$fh1} $code; |
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3
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50
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254
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3
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231
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close( $fh1 ); |
255
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256
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# trying running the script a few different ways |
257
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3
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17
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my $chosen_way; |
258
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3
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4
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foreach my $way (@{ $ways } ) { |
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3
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12
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259
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3
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9
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my $method = "probe_system_$way"; |
260
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3
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15
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my $retval = $self->$method( $scriptname ); |
261
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3
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50
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14
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if ( defined( $retval ) ) { |
262
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3
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19
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$chosen_way = $way; |
263
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3
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21
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last; |
264
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} |
265
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} |
266
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267
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# cleanup |
268
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3
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477
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unlink( $scriptname ); |
269
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270
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3
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32
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return $chosen_way; |
271
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} |
272
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273
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274
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=item define_yammer_script |
275
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276
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This is an internally used routine, broken out as a method for |
277
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ease of testing. |
278
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279
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This generates some code for the 'yammer_script' which is used |
280
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used by L to check which ways work for running |
281
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external commands. The 'yammer_script' sends three lines of |
282
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output to stdout, and if provided with command-line arguments, it |
283
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will echo up to three of them to stderr. The stderr output is |
284
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interleaved with the output sent to stdout, starting with stdout |
285
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(so the pattern is: OeOeOe). |
286
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287
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This method uses the object data L to get |
288
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|
an aref of messages to send to stdout; but this can be overridden |
289
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by passing it an aref of alternate messages. |
290
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291
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|
So, just to make it clear: the STDOUT strings are defined when |
292
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|
this method is called, but the STDERR strings are defined only |
293
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|
when the yammer script it generates is run. |
294
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|
295
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|
=cut |
296
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|
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|
|
297
|
|
|
|
|
|
|
sub define_yammer_script { |
298
|
3
|
|
|
3
|
1
|
7
|
my $self = shift; |
299
|
3
|
|
33
|
|
|
51
|
my $messages = shift || $self->stdout_probe_messages; |
300
|
3
|
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|
|
4
|
my ($x, $y, $z) = @{ $messages }; |
|
3
|
|
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|
9
|
|
301
|
3
|
|
|
|
|
20
|
my $code = |
302
|
|
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|
|
|
|
'$|=1;' . "\n" . |
303
|
|
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|
|
|
|
'print "' . $x . '\n"; ' . "\n" . |
304
|
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|
|
'print STDERR "$ARGV[0]\n" if defined($ARGV[0]); ' . "\n" . |
305
|
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|
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|
|
'print "' . $y . '\n"; ' . "\n" . |
306
|
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|
|
'print STDERR "$ARGV[1]\n" if defined($ARGV[1]); ' . "\n" . |
307
|
|
|
|
|
|
|
'print "' . $z . '\n"; ' . "\n" . |
308
|
|
|
|
|
|
|
'print STDERR "$ARGV[2]\n" if defined($ARGV[2]); ' . "\n" ; |
309
|
3
|
|
|
|
|
8
|
return $code; |
310
|
|
|
|
|
|
|
} |
311
|
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|
|
|
312
|
|
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|
|
|
313
|
|
|
|
|
|
|
=item probe_system_qx |
314
|
|
|
|
|
|
|
|
315
|
|
|
|
|
|
|
Method used internally by the internal method "probe_system". |
316
|
|
|
|
|
|
|
Takes one argument: the script name, which it will try to run |
317
|
|
|
|
|
|
|
via qx. |
318
|
|
|
|
|
|
|
|
319
|
|
|
|
|
|
|
=cut |
320
|
|
|
|
|
|
|
|
321
|
|
|
|
|
|
|
sub probe_system_qx { |
322
|
3
|
|
|
3
|
1
|
5
|
my $self = shift; |
323
|
3
|
|
|
|
|
6
|
my $scriptname = shift; |
324
|
3
|
|
33
|
|
|
29
|
my $stderr_probe_messages = shift || $self->stderr_probe_messages; |
325
|
|
|
|
|
|
|
|
326
|
3
|
|
|
|
|
6
|
my $perl = $^X; # have perl tell us where it is (might not be in path) |
327
|
3
|
|
|
|
|
5
|
my $stderr_args = join ' ', @{ $stderr_probe_messages }; |
|
3
|
|
|
|
|
10
|
|
328
|
3
|
|
|
|
|
8
|
my $cmd = "$perl $scriptname $stderr_args"; |
329
|
|
|
|
|
|
|
|
330
|
3
|
|
|
|
|
9
|
my $stdout_probe_messages = $self->stdout_probe_messages; |
331
|
|
|
|
|
|
|
|
332
|
3
|
|
|
|
|
3
|
my ($capture_stdout, $capture_stderr, $capture_all); |
333
|
3
|
|
|
|
|
11
|
$capture_stdout = $self->run_qx_stdout_only( $cmd ); |
334
|
3
|
|
|
|
|
208
|
chomp($capture_stdout); |
335
|
3
|
|
|
|
|
37
|
$capture_stderr = $self->run_qx_stderr_only( $cmd ); |
336
|
3
|
|
|
|
|
17
|
chomp($capture_stderr); |
337
|
3
|
|
|
|
|
20
|
$capture_all = $self->run_qx_all_output( $cmd ); |
338
|
3
|
|
|
|
|
13
|
chomp($capture_all); |
339
|
|
|
|
|
|
|
|
340
|
3
|
|
|
|
|
8
|
my $expected_stdout = join "\n", @{ $stdout_probe_messages }; |
|
3
|
|
|
|
|
26
|
|
341
|
3
|
|
|
|
|
12
|
my $expected_stderr = join "\n", @{ $stderr_probe_messages }; |
|
3
|
|
|
|
|
15
|
|
342
|
3
|
|
|
|
|
10
|
my $expected_all = join "\n", zip @{ $stdout_probe_messages }, @{ $stderr_probe_messages }; |
|
3
|
|
|
|
|
8
|
|
|
3
|
|
|
|
|
61
|
|
343
|
|
|
|
|
|
|
|
344
|
3
|
50
|
33
|
|
|
124
|
if ( ( $capture_stdout eq $expected_stdout ) && |
|
|
|
33
|
|
|
|
|
345
|
|
|
|
|
|
|
( $capture_stderr eq $expected_stderr ) && |
346
|
|
|
|
|
|
|
( $capture_all eq $expected_all ) ) { |
347
|
3
|
|
|
|
|
41
|
return 1; |
348
|
|
|
|
|
|
|
} else { |
349
|
0
|
|
|
|
|
0
|
return; |
350
|
|
|
|
|
|
|
} |
351
|
|
|
|
|
|
|
} |
352
|
|
|
|
|
|
|
|
353
|
|
|
|
|
|
|
|
354
|
|
|
|
|
|
|
=item probe_system_ipc_cmd |
355
|
|
|
|
|
|
|
|
356
|
|
|
|
|
|
|
Method used internally by the internal method "probe_system". |
357
|
|
|
|
|
|
|
Takes one argument: the script name, which it will try to run |
358
|
|
|
|
|
|
|
via IPC::Cmd. |
359
|
|
|
|
|
|
|
|
360
|
|
|
|
|
|
|
=cut |
361
|
|
|
|
|
|
|
|
362
|
|
|
|
|
|
|
sub probe_system_ipc_cmd { |
363
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
364
|
0
|
|
|
|
|
0
|
my $scriptname = shift; |
365
|
0
|
|
0
|
|
|
0
|
my $stderr_probe_messages = shift || [ '123', '567', '890' ]; |
366
|
|
|
|
|
|
|
|
367
|
0
|
|
|
|
|
0
|
my $perl = $^X; # have perl tell us where it is (might not be in path) |
368
|
0
|
|
|
|
|
0
|
my $stderr_args = join ' ', @{ $stderr_probe_messages }; |
|
0
|
|
|
|
|
0
|
|
369
|
0
|
|
|
|
|
0
|
my $cmd = "$perl $scriptname $stderr_args"; |
370
|
|
|
|
|
|
|
|
371
|
0
|
|
|
|
|
0
|
my $stdout_probe_messages = $self->stdout_probe_messages; |
372
|
|
|
|
|
|
|
|
373
|
0
|
|
|
|
|
0
|
my ($capture_stdout, $capture_stderr, $capture_all); |
374
|
0
|
|
|
|
|
0
|
$capture_stdout = $self->run_ipc_cmd_stdout_only( $cmd ); |
375
|
0
|
|
|
|
|
0
|
chomp($capture_stdout); |
376
|
0
|
|
|
|
|
0
|
$capture_stderr = $self->run_ipc_cmd_stderr_only( $cmd ); |
377
|
0
|
|
|
|
|
0
|
chomp($capture_stderr); |
378
|
0
|
|
|
|
|
0
|
$capture_all = $self->run_ipc_cmd_all_output( $cmd ); |
379
|
0
|
|
|
|
|
0
|
chomp($capture_all); |
380
|
|
|
|
|
|
|
|
381
|
0
|
|
|
|
|
0
|
my $expected_stdout = join "\n", @{ $stdout_probe_messages }; |
|
0
|
|
|
|
|
0
|
|
382
|
0
|
|
|
|
|
0
|
my $expected_stderr = join "\n", @{ $stderr_probe_messages }; |
|
0
|
|
|
|
|
0
|
|
383
|
0
|
|
|
|
|
0
|
my $expected_all = join "\n", zip @{ $stdout_probe_messages }, @{ $stderr_probe_messages }; |
|
0
|
|
|
|
|
0
|
|
|
0
|
|
|
|
|
0
|
|
384
|
|
|
|
|
|
|
|
385
|
0
|
0
|
0
|
|
|
0
|
if ( ( $capture_stdout eq $expected_stdout ) && |
|
|
|
0
|
|
|
|
|
386
|
|
|
|
|
|
|
( $capture_stderr eq $expected_stderr ) && |
387
|
|
|
|
|
|
|
( $capture_all eq $expected_all ) ) { |
388
|
0
|
|
|
|
|
0
|
return 1; |
389
|
|
|
|
|
|
|
} else { |
390
|
0
|
|
|
|
|
0
|
return; |
391
|
|
|
|
|
|
|
} |
392
|
|
|
|
|
|
|
} |
393
|
|
|
|
|
|
|
|
394
|
|
|
|
|
|
|
=item can_run |
395
|
|
|
|
|
|
|
|
396
|
|
|
|
|
|
|
Given the name of an external command, will check to see if we |
397
|
|
|
|
|
|
|
can run it. |
398
|
|
|
|
|
|
|
|
399
|
|
|
|
|
|
|
Note: just because the program has the name you're looking for, |
400
|
|
|
|
|
|
|
there's no guarantee that it's the right program. |
401
|
|
|
|
|
|
|
|
402
|
|
|
|
|
|
|
=cut |
403
|
|
|
|
|
|
|
|
404
|
|
|
|
|
|
|
sub can_run { |
405
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
406
|
0
|
|
|
|
|
0
|
my $cmd = shift; |
407
|
0
|
|
|
|
|
0
|
my $way = $self->way; |
408
|
0
|
|
|
|
|
0
|
my $method = "can_run_$way"; |
409
|
0
|
|
|
|
|
0
|
my $status = $self->$method( $cmd ); |
410
|
0
|
|
|
|
|
0
|
return $status; |
411
|
|
|
|
|
|
|
} |
412
|
|
|
|
|
|
|
|
413
|
|
|
|
|
|
|
=item can_run_qx |
414
|
|
|
|
|
|
|
|
415
|
|
|
|
|
|
|
This is a method used internally by L, it tries to |
416
|
|
|
|
|
|
|
determine if the given program can be run via the shell |
417
|
|
|
|
|
|
|
(i.e. the "qx" way), and returns the full path to the program |
418
|
|
|
|
|
|
|
if it's found, otherwise, undef. |
419
|
|
|
|
|
|
|
|
420
|
|
|
|
|
|
|
=cut |
421
|
|
|
|
|
|
|
|
422
|
|
|
|
|
|
|
# Trying a few different ways, only one of which need work... |
423
|
|
|
|
|
|
|
sub can_run_qx { |
424
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
425
|
0
|
|
|
|
|
0
|
my $program = shift; |
426
|
0
|
|
|
|
|
0
|
my $found; |
427
|
|
|
|
|
|
|
|
428
|
0
|
0
|
|
|
|
0
|
if( $found = $self->can_run_qx_which( $program ) ) { |
|
|
0
|
|
|
|
|
|
429
|
0
|
|
|
|
|
0
|
return $found; |
430
|
|
|
|
|
|
|
} elsif( $found = $self->can_run_qx_path_glob( $program ) ) { |
431
|
0
|
|
|
|
|
0
|
return $found; |
432
|
|
|
|
|
|
|
} |
433
|
|
|
|
|
|
|
|
434
|
0
|
|
|
|
|
0
|
return; # undef, nothing found |
435
|
|
|
|
|
|
|
} |
436
|
|
|
|
|
|
|
|
437
|
|
|
|
|
|
|
|
438
|
|
|
|
|
|
|
=item can_run_qx_which |
439
|
|
|
|
|
|
|
|
440
|
|
|
|
|
|
|
This is a method used internally by L. |
441
|
|
|
|
|
|
|
It uses the old old unix utility "which" to look for |
442
|
|
|
|
|
|
|
the given program. |
443
|
|
|
|
|
|
|
|
444
|
|
|
|
|
|
|
=cut |
445
|
|
|
|
|
|
|
|
446
|
|
|
|
|
|
|
sub can_run_qx_which { |
447
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
448
|
0
|
|
|
|
|
0
|
my $program = shift; |
449
|
0
|
|
|
|
|
0
|
my $subname = ( caller(0) )[3]; |
450
|
|
|
|
|
|
|
|
451
|
0
|
|
|
|
|
0
|
my $which = 'which'; |
452
|
0
|
|
|
|
|
0
|
my $found; |
453
|
0
|
|
|
|
|
0
|
eval { |
454
|
1
|
|
|
1
|
|
8
|
no warnings; |
|
1
|
|
|
|
|
3
|
|
|
1
|
|
|
|
|
2454
|
|
455
|
0
|
|
|
|
|
0
|
$found = qx{ $which $program }; |
456
|
0
|
|
|
|
|
0
|
chomp( $found ); |
457
|
|
|
|
|
|
|
}; |
458
|
0
|
0
|
0
|
|
|
0
|
if ($@) { |
|
|
0
|
|
|
|
|
|
459
|
0
|
|
|
|
|
0
|
$self->debug("$subname: Running '$which' errored out: $@\n"); |
460
|
0
|
|
|
|
|
0
|
return; |
461
|
|
|
|
|
|
|
} elsif ( defined( $found ) && ($found =~ m{ \b $program $ }xms) ) { |
462
|
0
|
|
|
|
|
0
|
return $found; |
463
|
|
|
|
|
|
|
} else { |
464
|
0
|
|
|
|
|
0
|
return; |
465
|
|
|
|
|
|
|
} |
466
|
|
|
|
|
|
|
} |
467
|
|
|
|
|
|
|
|
468
|
|
|
|
|
|
|
|
469
|
|
|
|
|
|
|
=item can_run_qx_path_glob |
470
|
|
|
|
|
|
|
|
471
|
|
|
|
|
|
|
This is a method used internally by L. |
472
|
|
|
|
|
|
|
It looks for the given program by checking looking for |
473
|
|
|
|
|
|
|
an executible file of that name somewhere in the path. |
474
|
|
|
|
|
|
|
|
475
|
|
|
|
|
|
|
=cut |
476
|
|
|
|
|
|
|
|
477
|
|
|
|
|
|
|
sub can_run_qx_path_glob { |
478
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
479
|
0
|
|
|
|
|
0
|
my $program = shift; |
480
|
0
|
|
|
|
|
0
|
my $found; |
481
|
|
|
|
|
|
|
# Just look in each directory in the PATH for an |
482
|
|
|
|
|
|
|
# executable file with the right name, |
483
|
0
|
|
|
|
|
0
|
my @PATH = File::Spec->path(); |
484
|
0
|
|
|
|
|
0
|
foreach my $loc (@PATH) { |
485
|
0
|
|
|
|
|
0
|
chdir( $loc ); |
486
|
|
|
|
|
|
|
# This is better for debugging (for obscure reasons): |
487
|
|
|
|
|
|
|
# my @names = glob '*'; |
488
|
|
|
|
|
|
|
# foreach my $name (@names) { |
489
|
|
|
|
|
|
|
# But this is more memory efficient... |
490
|
0
|
|
|
|
|
0
|
while ( my $name = glob '*' ) { |
491
|
0
|
0
|
0
|
|
|
0
|
if (( $name eq $program ) && ( -f "$loc/$name" ) && ( -x "$loc/$name" )) { |
|
|
|
0
|
|
|
|
|
492
|
0
|
|
|
|
|
0
|
$found = File::Spec->catfile($loc, $name); |
493
|
0
|
|
|
|
|
0
|
return $found; |
494
|
|
|
|
|
|
|
} |
495
|
|
|
|
|
|
|
} |
496
|
|
|
|
|
|
|
} |
497
|
0
|
|
|
|
|
0
|
return; |
498
|
|
|
|
|
|
|
} |
499
|
|
|
|
|
|
|
|
500
|
|
|
|
|
|
|
=item can_run_ipc_cmd |
501
|
|
|
|
|
|
|
|
502
|
|
|
|
|
|
|
Given the name of a program, checks to see if it can run it. |
503
|
|
|
|
|
|
|
Returns the full path to the binary if it is found. |
504
|
|
|
|
|
|
|
|
505
|
|
|
|
|
|
|
Note: this is a simple wrapper around IPC::Cmd::can_run. |
506
|
|
|
|
|
|
|
|
507
|
|
|
|
|
|
|
=cut |
508
|
|
|
|
|
|
|
|
509
|
|
|
|
|
|
|
sub can_run_ipc_cmd { |
510
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
511
|
0
|
|
|
|
|
0
|
my $program = shift; |
512
|
0
|
|
|
|
|
0
|
require IPC::Cmd; |
513
|
0
|
|
|
|
|
0
|
my $path = IPC::Cmd::can_run( $program ); |
514
|
0
|
|
|
|
|
0
|
return $path; |
515
|
|
|
|
|
|
|
} |
516
|
|
|
|
|
|
|
|
517
|
|
|
|
|
|
|
=item run |
518
|
|
|
|
|
|
|
|
519
|
|
|
|
|
|
|
Takes one argument: an external command string. |
520
|
|
|
|
|
|
|
|
521
|
|
|
|
|
|
|
Returns the output from the external command (as controlled by |
522
|
|
|
|
|
|
|
the L setting in the object). The output |
523
|
|
|
|
|
|
|
will almost always be in the form of a multi-line string, |
524
|
|
|
|
|
|
|
except in one case: |
525
|
|
|
|
|
|
|
|
526
|
|
|
|
|
|
|
If filter is set to "all_separated", then this will return a |
527
|
|
|
|
|
|
|
reference to an array of two elements, the first containing |
528
|
|
|
|
|
|
|
stdout, the second stderr. |
529
|
|
|
|
|
|
|
|
530
|
|
|
|
|
|
|
=cut |
531
|
|
|
|
|
|
|
|
532
|
|
|
|
|
|
|
sub run { |
533
|
8
|
|
|
8
|
1
|
70
|
my $self = shift; |
534
|
8
|
|
|
|
|
21
|
my $cmd = shift; |
535
|
8
|
|
|
|
|
21
|
my $output; |
536
|
8
|
|
|
|
|
58
|
my $way = $self->way; |
537
|
8
|
|
|
|
|
37
|
my $od = $self->filter; |
538
|
8
|
|
|
|
|
30
|
my $method = 'run_' . $way. '_' . $od ; # run__ |
539
|
8
|
|
|
|
|
58
|
$output = $self->$method( $cmd ); |
540
|
8
|
|
|
|
|
386
|
return $output; |
541
|
|
|
|
|
|
|
} |
542
|
|
|
|
|
|
|
|
543
|
|
|
|
|
|
|
=back |
544
|
|
|
|
|
|
|
|
545
|
|
|
|
|
|
|
=head2 "run__" |
546
|
|
|
|
|
|
|
|
547
|
|
|
|
|
|
|
These methods are for internal use by the "run" method. |
548
|
|
|
|
|
|
|
|
549
|
|
|
|
|
|
|
=head2 "run_qx_*" methods |
550
|
|
|
|
|
|
|
|
551
|
|
|
|
|
|
|
These are methods that take the given command and simply try to |
552
|
|
|
|
|
|
|
run them via whatever shell is available to the qx{} operator. |
553
|
|
|
|
|
|
|
|
554
|
|
|
|
|
|
|
The L setting is converted to equivalent |
555
|
|
|
|
|
|
|
Bourne shell redirect. |
556
|
|
|
|
|
|
|
|
557
|
|
|
|
|
|
|
=over |
558
|
|
|
|
|
|
|
|
559
|
|
|
|
|
|
|
=item run_qx_all_output |
560
|
|
|
|
|
|
|
|
561
|
|
|
|
|
|
|
=cut |
562
|
|
|
|
|
|
|
|
563
|
|
|
|
|
|
|
sub run_qx_all_output { |
564
|
5
|
|
|
5
|
1
|
9
|
my $self = shift; |
565
|
5
|
|
|
|
|
16
|
my $cmd = shift; |
566
|
5
|
|
|
|
|
16
|
my $output; |
567
|
5
|
|
|
|
|
30
|
my $sod = '2>&1'; |
568
|
5
|
|
|
|
|
158836
|
$output = qx{$cmd $sod}; |
569
|
5
|
50
|
|
|
|
239
|
chomp( $output ) if $self->autochomp; |
570
|
5
|
|
|
|
|
80
|
return $output; |
571
|
|
|
|
|
|
|
} |
572
|
|
|
|
|
|
|
|
573
|
|
|
|
|
|
|
=item run_qx_stdout_only |
574
|
|
|
|
|
|
|
|
575
|
|
|
|
|
|
|
=cut |
576
|
|
|
|
|
|
|
|
577
|
|
|
|
|
|
|
sub run_qx_stdout_only { |
578
|
5
|
|
|
5
|
1
|
9
|
my $self = shift; |
579
|
5
|
|
|
|
|
7
|
my $cmd = shift; |
580
|
5
|
|
|
|
|
5
|
my $output; |
581
|
5
|
|
|
|
|
72
|
my $devnull = File::Spec->devnull; |
582
|
5
|
|
|
|
|
13
|
my $sod = "2>$devnull"; |
583
|
5
|
|
|
|
|
184674
|
$output = qx{$cmd $sod}; |
584
|
5
|
50
|
|
|
|
282
|
chomp( $output ) if $self->autochomp; |
585
|
5
|
|
|
|
|
214
|
return $output; |
586
|
|
|
|
|
|
|
} |
587
|
|
|
|
|
|
|
|
588
|
|
|
|
|
|
|
=item run_qx_stderr_only |
589
|
|
|
|
|
|
|
|
590
|
|
|
|
|
|
|
=cut |
591
|
|
|
|
|
|
|
|
592
|
|
|
|
|
|
|
sub run_qx_stderr_only { |
593
|
5
|
|
|
5
|
1
|
209
|
my $self = shift; |
594
|
5
|
|
|
|
|
14
|
my $cmd = shift; |
595
|
5
|
|
|
|
|
9
|
my $output; |
596
|
5
|
|
|
|
|
97
|
my $devnull = File::Spec->devnull; |
597
|
5
|
|
|
|
|
23
|
my $sod = "2>&1 1>$devnull"; |
598
|
5
|
|
|
|
|
185716
|
$output = qx{$cmd $sod}; |
599
|
5
|
50
|
|
|
|
206
|
chomp( $output ) if $self->autochomp; |
600
|
5
|
|
|
|
|
78
|
return $output; |
601
|
|
|
|
|
|
|
} |
602
|
|
|
|
|
|
|
|
603
|
|
|
|
|
|
|
=item run_qx_all_separated_old |
604
|
|
|
|
|
|
|
|
605
|
|
|
|
|
|
|
(An earlier attempt that seemed "more correct" |
606
|
|
|
|
|
|
|
to me, but doesn't work on MSwin32.) |
607
|
|
|
|
|
|
|
|
608
|
|
|
|
|
|
|
=cut |
609
|
|
|
|
|
|
|
|
610
|
|
|
|
|
|
|
# uses redirection to a temp file to get stderr isolated from stdout |
611
|
|
|
|
|
|
|
sub run_qx_all_separated_old { |
612
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
613
|
0
|
|
|
|
|
0
|
my $cmd = shift; |
614
|
0
|
|
|
|
|
0
|
my ($output, $stdout, $stderr); |
615
|
0
|
|
|
|
|
0
|
my $tmpdir = File::Spec->tmpdir(); |
616
|
|
|
|
|
|
|
|
617
|
0
|
0
|
|
|
|
0
|
$File::Temp::KEEP_ALL = 1 if $DEBUG; |
618
|
|
|
|
|
|
|
|
619
|
0
|
|
|
|
|
0
|
my ($fh, $filename) = tempfile('buf_XXXX', |
620
|
|
|
|
|
|
|
SUFFIX => '.dat', |
621
|
|
|
|
|
|
|
DIR => $tmpdir, |
622
|
|
|
|
|
|
|
UNLINK => 1); |
623
|
|
|
|
|
|
|
|
624
|
|
|
|
|
|
|
|
625
|
0
|
|
|
|
|
0
|
my $sod = "2>$filename"; |
626
|
0
|
|
|
|
|
0
|
$stdout = qx{$cmd $sod}; |
627
|
|
|
|
|
|
|
|
628
|
0
|
|
|
|
|
0
|
while( my $line = <$fh> ) { |
629
|
0
|
|
|
|
|
0
|
$stderr .= $line; |
630
|
|
|
|
|
|
|
} |
631
|
|
|
|
|
|
|
|
632
|
0
|
|
|
|
|
0
|
$output = [ $stdout, $stderr ]; |
633
|
0
|
0
|
|
|
|
0
|
$self->chomp_aref( $output ) if $self->autochomp; |
634
|
0
|
|
|
|
|
0
|
return $output; |
635
|
|
|
|
|
|
|
} |
636
|
|
|
|
|
|
|
|
637
|
|
|
|
|
|
|
|
638
|
|
|
|
|
|
|
=item run_qx_all_separated |
639
|
|
|
|
|
|
|
|
640
|
|
|
|
|
|
|
|
641
|
|
|
|
|
|
|
=cut |
642
|
|
|
|
|
|
|
|
643
|
|
|
|
|
|
|
# And alternate form of L to work |
644
|
|
|
|
|
|
|
# around an mswin32 issue. |
645
|
|
|
|
|
|
|
|
646
|
|
|
|
|
|
|
sub run_qx_all_separated { |
647
|
2
|
|
|
2
|
1
|
14
|
my $self = shift; |
648
|
2
|
|
|
|
|
10
|
my $cmd = shift; |
649
|
2
|
|
|
|
|
8
|
my ($output, $stdout, $stderr); |
650
|
2
|
|
|
|
|
87
|
my $tmpdir = File::Spec->tmpdir(); |
651
|
|
|
|
|
|
|
|
652
|
|
|
|
|
|
|
# $File::Temp::KEEP_ALL = 1 if $DEBUG; |
653
|
|
|
|
|
|
|
|
654
|
2
|
|
|
|
|
41
|
my ($fh, $filename) = tempfile('buf_XXXX', |
655
|
|
|
|
|
|
|
SUFFIX => '.dat', |
656
|
|
|
|
|
|
|
DIR => $tmpdir, |
657
|
|
|
|
|
|
|
UNLINK => 0); |
658
|
|
|
|
|
|
|
|
659
|
2
|
|
|
|
|
1351
|
close($fh); |
660
|
|
|
|
|
|
|
|
661
|
2
|
|
|
|
|
9
|
my $sod = "2>$filename"; |
662
|
2
|
|
|
|
|
174651
|
$stdout = qx{$cmd $sod}; |
663
|
|
|
|
|
|
|
|
664
|
2
|
50
|
|
|
|
180
|
open $fh, '<', $filename or croak "Could not re-open $filename for read: $!"; |
665
|
|
|
|
|
|
|
|
666
|
2
|
|
|
|
|
62
|
while( my $line = <$fh> ) { |
667
|
12
|
|
|
|
|
47
|
$stderr .= $line; |
668
|
|
|
|
|
|
|
} |
669
|
2
|
|
|
|
|
23
|
close($fh); |
670
|
|
|
|
|
|
|
|
671
|
2
|
50
|
|
|
|
293
|
unlink( $filename ) unless $DEBUG; |
672
|
|
|
|
|
|
|
|
673
|
2
|
|
|
|
|
21
|
$output = [ $stdout, $stderr ]; |
674
|
2
|
50
|
|
|
|
37
|
$self->chomp_aref( $output ) if $self->autochomp; |
675
|
2
|
|
|
|
|
51
|
return $output; |
676
|
|
|
|
|
|
|
} |
677
|
|
|
|
|
|
|
|
678
|
|
|
|
|
|
|
|
679
|
|
|
|
|
|
|
|
680
|
|
|
|
|
|
|
=back |
681
|
|
|
|
|
|
|
|
682
|
|
|
|
|
|
|
=head2 "run_ipc_cmd_*" methods |
683
|
|
|
|
|
|
|
|
684
|
|
|
|
|
|
|
These are methods that take the given command and try to |
685
|
|
|
|
|
|
|
run them via the L module, (which in turn will try |
686
|
|
|
|
|
|
|
to use L or L). |
687
|
|
|
|
|
|
|
|
688
|
|
|
|
|
|
|
The L setting determines what kind of |
689
|
|
|
|
|
|
|
IPC::Cmd call to use, and which of it's output channels will |
690
|
|
|
|
|
|
|
be returned. |
691
|
|
|
|
|
|
|
|
692
|
|
|
|
|
|
|
=over |
693
|
|
|
|
|
|
|
|
694
|
|
|
|
|
|
|
=item run_ipc_cmd_stdout_only |
695
|
|
|
|
|
|
|
|
696
|
|
|
|
|
|
|
Used internally by L when the L is set |
697
|
|
|
|
|
|
|
to 'stdout_only' (and the L is 'ipc_cmd'). |
698
|
|
|
|
|
|
|
|
699
|
|
|
|
|
|
|
=cut |
700
|
|
|
|
|
|
|
|
701
|
|
|
|
|
|
|
sub run_ipc_cmd_stdout_only { |
702
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
703
|
0
|
|
|
|
|
0
|
my $cmd = shift; |
704
|
0
|
|
|
|
|
0
|
my $output; |
705
|
|
|
|
|
|
|
my $all_buf; |
706
|
0
|
|
|
|
|
0
|
require IPC::Cmd; |
707
|
0
|
|
|
|
|
0
|
my( $success, $error_code, $all_sep_buf, $stdout_buf, $stderr_buf ) = |
708
|
|
|
|
|
|
|
IPC::Cmd::run( command => $cmd, verbose => 0, buffer=> \$all_buf ); |
709
|
0
|
|
|
|
|
0
|
$output = $stdout_buf->[0]; |
710
|
|
|
|
|
|
|
|
711
|
0
|
0
|
|
|
|
0
|
if( not( $success ) ) { |
712
|
0
|
|
|
|
|
0
|
warn "IPC::Cmd run of $cmd failed."; |
713
|
|
|
|
|
|
|
} |
714
|
0
|
0
|
|
|
|
0
|
chomp( $output ) if $self->autochomp; |
715
|
0
|
|
|
|
|
0
|
return $output; |
716
|
|
|
|
|
|
|
} |
717
|
|
|
|
|
|
|
|
718
|
|
|
|
|
|
|
|
719
|
|
|
|
|
|
|
=item run_ipc_cmd_stderr_only |
720
|
|
|
|
|
|
|
|
721
|
|
|
|
|
|
|
Used internally by L when the L is set |
722
|
|
|
|
|
|
|
to 'stderr_only' (and the L is 'ipc_cmd'): |
723
|
|
|
|
|
|
|
|
724
|
|
|
|
|
|
|
=cut |
725
|
|
|
|
|
|
|
|
726
|
|
|
|
|
|
|
sub run_ipc_cmd_stderr_only { |
727
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
728
|
0
|
|
|
|
|
0
|
my $cmd = shift; |
729
|
0
|
|
|
|
|
0
|
my $output; |
730
|
|
|
|
|
|
|
my $all_buf; |
731
|
0
|
|
|
|
|
0
|
require IPC::Cmd; |
732
|
0
|
|
|
|
|
0
|
my( $success, $error_code, $all_sep_buf, $stdout_buf, $stderr_buf ) = |
733
|
|
|
|
|
|
|
IPC::Cmd::run( command => $cmd, verbose => 0, buffer=> \$all_buf ); |
734
|
0
|
|
|
|
|
0
|
$output = $stderr_buf->[0]; |
735
|
|
|
|
|
|
|
|
736
|
0
|
0
|
|
|
|
0
|
if( not( $success ) ) { |
737
|
0
|
|
|
|
|
0
|
warn "IPC::Cmd run of $cmd has failed"; |
738
|
|
|
|
|
|
|
} |
739
|
0
|
0
|
|
|
|
0
|
chomp( $output ) if $self->autochomp; |
740
|
0
|
|
|
|
|
0
|
return $output; |
741
|
|
|
|
|
|
|
} |
742
|
|
|
|
|
|
|
|
743
|
|
|
|
|
|
|
|
744
|
|
|
|
|
|
|
=item run_ipc_cmd_all_output |
745
|
|
|
|
|
|
|
|
746
|
|
|
|
|
|
|
Used internally by L when the L is set |
747
|
|
|
|
|
|
|
to 'all_output' (and the L is 'ipc_cmd'): |
748
|
|
|
|
|
|
|
|
749
|
|
|
|
|
|
|
=cut |
750
|
|
|
|
|
|
|
|
751
|
|
|
|
|
|
|
sub run_ipc_cmd_all_output { |
752
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
753
|
0
|
|
|
|
|
0
|
my $cmd = shift; |
754
|
0
|
|
|
|
|
0
|
my $output; |
755
|
|
|
|
|
|
|
my $all_buf; |
756
|
0
|
|
|
|
|
0
|
require IPC::Cmd; |
757
|
0
|
0
|
|
|
|
0
|
if( IPC::Cmd::run( command => $cmd, verbose => 0, buffer=> \$all_buf ) ) { |
758
|
0
|
|
|
|
|
0
|
$output = $all_buf; |
759
|
|
|
|
|
|
|
} else { |
760
|
0
|
|
|
|
|
0
|
warn "IPC::Cmd run of $cmd failed."; |
761
|
|
|
|
|
|
|
} |
762
|
0
|
0
|
|
|
|
0
|
chomp( $output ) if $self->autochomp; |
763
|
0
|
|
|
|
|
0
|
return $output; |
764
|
|
|
|
|
|
|
} |
765
|
|
|
|
|
|
|
|
766
|
|
|
|
|
|
|
=item run_ipc_cmd_all_separated |
767
|
|
|
|
|
|
|
|
768
|
|
|
|
|
|
|
Used internally by L when the L is set |
769
|
|
|
|
|
|
|
to 'all_separated' (and the L is 'ipc_cmd'): |
770
|
|
|
|
|
|
|
|
771
|
|
|
|
|
|
|
=cut |
772
|
|
|
|
|
|
|
|
773
|
|
|
|
|
|
|
sub run_ipc_cmd_all_separated { |
774
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
775
|
0
|
|
|
|
|
0
|
my $cmd = shift; |
776
|
0
|
|
|
|
|
0
|
my ($output, $stdout, $stderr); |
777
|
0
|
|
|
|
|
0
|
my $all_buf; |
778
|
0
|
|
|
|
|
0
|
require IPC::Cmd; |
779
|
0
|
|
|
|
|
0
|
my( $success, $error_code, $all_sep_buf, $stdout_buf, $stderr_buf ) = |
780
|
|
|
|
|
|
|
IPC::Cmd::run( command => $cmd, verbose => 0, buffer=> \$all_buf ); |
781
|
0
|
|
|
|
|
0
|
$output = $all_sep_buf; |
782
|
|
|
|
|
|
|
|
783
|
0
|
0
|
|
|
|
0
|
if( not( $success ) ) { |
784
|
0
|
|
|
|
|
0
|
warn "IPC::Cmd run of $cmd failed."; |
785
|
|
|
|
|
|
|
} |
786
|
|
|
|
|
|
|
|
787
|
0
|
0
|
|
|
|
0
|
$self->chomp_aref( $output ) if $self->autochomp; |
788
|
0
|
|
|
|
|
0
|
return $output; |
789
|
|
|
|
|
|
|
} |
790
|
|
|
|
|
|
|
|
791
|
|
|
|
|
|
|
=back |
792
|
|
|
|
|
|
|
|
793
|
|
|
|
|
|
|
=head1 utility methods |
794
|
|
|
|
|
|
|
|
795
|
|
|
|
|
|
|
=over |
796
|
|
|
|
|
|
|
|
797
|
|
|
|
|
|
|
=item chomp_aref |
798
|
|
|
|
|
|
|
|
799
|
|
|
|
|
|
|
Like "chomp", but presumes it's been given an array reference |
800
|
|
|
|
|
|
|
of strings to work on. |
801
|
|
|
|
|
|
|
|
802
|
|
|
|
|
|
|
=cut |
803
|
|
|
|
|
|
|
|
804
|
|
|
|
|
|
|
sub chomp_aref { |
805
|
0
|
|
|
0
|
1
|
0
|
my $self = shift; |
806
|
0
|
|
|
|
|
0
|
my $aref = shift; |
807
|
|
|
|
|
|
|
|
808
|
0
|
0
|
|
|
|
0
|
unless ( ref( $aref ) eq 'ARRAY' ) { |
809
|
0
|
|
|
|
|
0
|
croak "chomp_aref only works on an array reference"; |
810
|
|
|
|
|
|
|
} |
811
|
0
|
|
|
|
|
0
|
foreach ( @{ $aref } ){ |
|
0
|
|
|
|
|
0
|
|
812
|
0
|
|
|
|
|
0
|
chomp( $_ ); |
813
|
|
|
|
|
|
|
} |
814
|
0
|
|
|
|
|
0
|
return $aref; |
815
|
|
|
|
|
|
|
} |
816
|
|
|
|
|
|
|
|
817
|
|
|
|
|
|
|
|
818
|
|
|
|
|
|
|
|
819
|
|
|
|
|
|
|
|
820
|
|
|
|
|
|
|
=back |
821
|
|
|
|
|
|
|
|
822
|
|
|
|
|
|
|
=head2 basic setters and getters |
823
|
|
|
|
|
|
|
|
824
|
|
|
|
|
|
|
The naming convention in use here is that setters begin with |
825
|
|
|
|
|
|
|
"set_", but getters have *no* prefix: the most commonly used case |
826
|
|
|
|
|
|
|
deserves the simplest syntax (and mutators are deprecated). |
827
|
|
|
|
|
|
|
|
828
|
|
|
|
|
|
|
These accessors exist for all of the object attributes (documented |
829
|
|
|
|
|
|
|
above) irrespective of whether they're expected to be externally useful. |
830
|
|
|
|
|
|
|
|
831
|
|
|
|
|
|
|
=head2 automatic generation of accessors |
832
|
|
|
|
|
|
|
|
833
|
|
|
|
|
|
|
=over |
834
|
|
|
|
|
|
|
|
835
|
|
|
|
|
|
|
=item AUTOLOAD |
836
|
|
|
|
|
|
|
|
837
|
|
|
|
|
|
|
=cut |
838
|
|
|
|
|
|
|
|
839
|
|
|
|
|
|
|
sub AUTOLOAD { |
840
|
7
|
50
|
|
7
|
|
227
|
return if $AUTOLOAD =~ /DESTROY$/; # skip calls to DESTROY () |
841
|
|
|
|
|
|
|
|
842
|
7
|
|
|
|
|
195
|
my ($name) = $AUTOLOAD =~ /([^:]+)$/; # extract method name |
843
|
7
|
|
|
|
|
26
|
(my $field = $name) =~ s/^set_//; |
844
|
|
|
|
|
|
|
|
845
|
|
|
|
|
|
|
# check that this is a valid accessor call |
846
|
7
|
50
|
|
|
|
25
|
croak("Unknown method '$AUTOLOAD' called") |
847
|
|
|
|
|
|
|
unless defined( $ATTRIBUTES{ $field } ); |
848
|
|
|
|
|
|
|
|
849
|
1
|
|
|
1
|
|
9
|
{ no strict 'refs'; |
|
1
|
|
|
|
|
1
|
|
|
1
|
|
|
|
|
256
|
|
|
7
|
|
|
|
|
12
|
|
850
|
|
|
|
|
|
|
|
851
|
|
|
|
|
|
|
# create the setter and getter and install them in the symbol table |
852
|
|
|
|
|
|
|
|
853
|
7
|
100
|
|
|
|
34
|
if ( $name =~ /^set_/ ) { |
|
|
50
|
|
|
|
|
|
854
|
|
|
|
|
|
|
|
855
|
|
|
|
|
|
|
*$name = sub { |
856
|
8
|
|
|
8
|
|
9779
|
my $self = shift; |
857
|
8
|
|
|
|
|
42
|
$self->{ $field } = shift; |
858
|
8
|
|
|
|
|
29
|
return $self->{ $field }; |
859
|
1
|
|
|
|
|
24
|
}; |
860
|
|
|
|
|
|
|
|
861
|
1
|
|
|
|
|
9
|
goto &$name; # jump to the new method. |
862
|
|
|
|
|
|
|
} elsif ( $name =~ /^get_/ ) { |
863
|
0
|
|
|
|
|
0
|
carp("Apparent attempt at using a getter with unneeded 'get_' prefix."); |
864
|
|
|
|
|
|
|
} |
865
|
|
|
|
|
|
|
|
866
|
|
|
|
|
|
|
*$name = sub { |
867
|
45
|
|
|
45
|
|
162
|
my $self = shift; |
868
|
45
|
|
|
|
|
307
|
return $self->{ $field }; |
869
|
6
|
|
|
|
|
51
|
}; |
870
|
|
|
|
|
|
|
|
871
|
6
|
|
|
|
|
25
|
goto &$name; # jump to the new method. |
872
|
|
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|
|
|
|
} |
873
|
|
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|
|
|
|
} |
874
|
|
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|
875
|
|
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876
|
|
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1; |
877
|
|
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878
|
|
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|
|
=back |
879
|
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880
|
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|
|
=head1 How It Works |
881
|
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|
882
|
|
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|
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|
|
Where possible, IPC::Capture will simply work by running the |
883
|
|
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|
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|
|
given command in a sub-shell, invoked with a qx. |
884
|
|
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|
885
|
|
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|
During the init phase, it tries to determine if a qx works as |
886
|
|
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|
|
|
|
expected (using Bourne-shell style redirects) by the expedient of |
887
|
|
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|
|
|
|
writing a temporary perl script that generates a known output, |
888
|
|
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|
|
|
|
and then just trying to run the script. (This step will be |
889
|
|
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|
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|
|
skipped if the object is told which style of i/o it should use |
890
|
|
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|
when instantiated.) |
891
|
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892
|
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|
|
It appears that qx with i/o re-direction is a relatively portable |
893
|
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|
|
idiom these days: it's supported by most forms of perl on |
894
|
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|
|
Windows, and I would be surprised if OSX does not support it |
895
|
|
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|
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|
|
also. |
896
|
|
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897
|
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|
If a qx fails, then this system will try another way of doing |
898
|
|
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|
|
|
the job using the L module. |
899
|
|
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|
900
|
|
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|
|
If no way of running a simple command and capturing it's output |
901
|
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|
|
can be found, an error will be signalled during instantiation. |
902
|
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903
|
|
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|
|
L in turn uses L or L (depending |
904
|
|
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|
|
|
on which is installed), which means that this module should have |
905
|
|
|
|
|
|
|
a fair degree of cross-platform portability. |
906
|
|
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|
907
|
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|
|
=head2 further notes |
908
|
|
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|
|
909
|
|
|
|
|
|
|
Depending on the type of output requested with the "filter", |
910
|
|
|
|
|
|
|
this module will choose to do either a scalar or an array context call |
911
|
|
|
|
|
|
|
to IPC::Cmd::run (insulating the user from one of IPC::Cmd's |
912
|
|
|
|
|
|
|
oddities). |
913
|
|
|
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|
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|
|
914
|
|
|
|
|
|
|
=head1 MOTIVATION |
915
|
|
|
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|
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|
|
916
|
|
|
|
|
|
|
The original goal was to find something more portable than |
917
|
|
|
|
|
|
|
shelling out via qx with Bourne shell redirection. |
918
|
|
|
|
|
|
|
|
919
|
|
|
|
|
|
|
I'd just written the L module that shells out to |
920
|
|
|
|
|
|
|
emacs, and I was looking for improvements. (Note: emacs is |
921
|
|
|
|
|
|
|
a widely available program, with portability roughly on the |
922
|
|
|
|
|
|
|
same scale as perl.) |
923
|
|
|
|
|
|
|
|
924
|
|
|
|
|
|
|
The L module looked like a promising simplification |
925
|
|
|
|
|
|
|
over directly using L or L, but it's |
926
|
|
|
|
|
|
|
output capture features seemed clumsy. |
927
|
|
|
|
|
|
|
|
928
|
|
|
|
|
|
|
So: my first thought was to write a wrapper around the wrapper, |
929
|
|
|
|
|
|
|
and as an added bonus, it would fall back on doing a simple qx |
930
|
|
|
|
|
|
|
if L wasn't going to work. |
931
|
|
|
|
|
|
|
|
932
|
|
|
|
|
|
|
My initial tests of that code immediately revealed a problem |
933
|
|
|
|
|
|
|
with L: it usually worked as expected, but sometimes |
934
|
|
|
|
|
|
|
would behave strangely (e.g. returning only one line of output |
935
|
|
|
|
|
|
|
instead of the expected six; or instead of interleaving stderr |
936
|
|
|
|
|
|
|
with stdout, it might return all stderr lines first). |
937
|
|
|
|
|
|
|
My suspicion was that this was due to running on a perl with |
938
|
|
|
|
|
|
|
threads enabled, but in any case, it didn't inspire confidence |
939
|
|
|
|
|
|
|
with the idea that L was going to be more reliable than qx. |
940
|
|
|
|
|
|
|
|
941
|
|
|
|
|
|
|
At which point, it occured to me that I could rewrite the |
942
|
|
|
|
|
|
|
module to work the other way around: just use qx, but fall |
943
|
|
|
|
|
|
|
back on L. And indeed, it wasn't that difficult to |
944
|
|
|
|
|
|
|
write probe routines to find out if qx works reliably. |
945
|
|
|
|
|
|
|
|
946
|
|
|
|
|
|
|
All of this work seemed a little besides the point when I realized |
947
|
|
|
|
|
|
|
that nearly every Windows installation of perl can deal with Bourne |
948
|
|
|
|
|
|
|
shell redirects -- but still this module may very well improve |
949
|
|
|
|
|
|
|
portability to some of the more unusual platforms such as VMS or |
950
|
|
|
|
|
|
|
the older Macs. |
951
|
|
|
|
|
|
|
|
952
|
|
|
|
|
|
|
And at the very least, if I use this module religiously, I can |
953
|
|
|
|
|
|
|
stop worrying about mistyping '2>&1'. |
954
|
|
|
|
|
|
|
|
955
|
|
|
|
|
|
|
|
956
|
|
|
|
|
|
|
=head1 TODO |
957
|
|
|
|
|
|
|
|
958
|
|
|
|
|
|
|
o More filters -- "output_to_file", etc. |
959
|
|
|
|
|
|
|
Add a general purpose, user-defineable one? |
960
|
|
|
|
|
|
|
|
961
|
|
|
|
|
|
|
o IPC::Cmd seems to have reliability problems (possibly, with |
962
|
|
|
|
|
|
|
multi-threaded perls?), the precise output it returns can vary |
963
|
|
|
|
|
|
|
from run to run. Possibly: implement a voting algorithm, return |
964
|
|
|
|
|
|
|
the output most commonly recieved. |
965
|
|
|
|
|
|
|
|
966
|
|
|
|
|
|
|
o Better test coverage: autochomp; probe_system*; |
967
|
|
|
|
|
|
|
|
968
|
|
|
|
|
|
|
o 02-can_run.t tests multiple internal routines, only one flavor of |
969
|
|
|
|
|
|
|
which need work for the overall behavior to work. Possibly should |
970
|
|
|
|
|
|
|
ship only with tests that verify the interface methods... |
971
|
|
|
|
|
|
|
|
972
|
|
|
|
|
|
|
o IPC::Capture lacks "success", as of 0.05. This means the SYNOPSIS |
973
|
|
|
|
|
|
|
is complete nonsense for versions 0.04 and earlier. For now, |
974
|
|
|
|
|
|
|
not mentioning "success", but think about implementing it. |
975
|
|
|
|
|
|
|
|
976
|
|
|
|
|
|
|
=head1 SEE ALSO |
977
|
|
|
|
|
|
|
|
978
|
|
|
|
|
|
|
L |
979
|
|
|
|
|
|
|
L |
980
|
|
|
|
|
|
|
L |
981
|
|
|
|
|
|
|
|
982
|
|
|
|
|
|
|
Shell redirection apparently works on Windows: |
983
|
|
|
|
|
|
|
http://www.perlmonks.org/?node_id=679842 |
984
|
|
|
|
|
|
|
|
985
|
|
|
|
|
|
|
|
986
|
|
|
|
|
|
|
=head1 AUTHOR |
987
|
|
|
|
|
|
|
|
988
|
|
|
|
|
|
|
Joseph Brenner, Edoom@kzsu.stanford.eduE, |
989
|
|
|
|
|
|
|
07 Apr 2008 |
990
|
|
|
|
|
|
|
|
991
|
|
|
|
|
|
|
=head1 COPYRIGHT AND LICENSE |
992
|
|
|
|
|
|
|
|
993
|
|
|
|
|
|
|
Copyright (C) 2008 by Joseph Brenner |
994
|
|
|
|
|
|
|
|
995
|
|
|
|
|
|
|
This library is free software; you can redistribute it and/or modify |
996
|
|
|
|
|
|
|
it under the same terms as Perl itself, either Perl version 5.8.2 or, |
997
|
|
|
|
|
|
|
at your option, any later version of Perl 5 you may have available. |
998
|
|
|
|
|
|
|
|
999
|
|
|
|
|
|
|
=head1 BUGS AND LIMITATIONS |
1000
|
|
|
|
|
|
|
|
1001
|
|
|
|
|
|
|
There are possible security gotchas with using this module, |
1002
|
|
|
|
|
|
|
because it hands strings off to the shell to execute. Any |
1003
|
|
|
|
|
|
|
commands built-up from user input should be scrubbed carefully |
1004
|
|
|
|
|
|
|
before being run with this module. Using taint is strongly |
1005
|
|
|
|
|
|
|
recommended: see L. |
1006
|
|
|
|
|
|
|
|
1007
|
|
|
|
|
|
|
=cut |