1 | # ------------------------------------------------------------------------------ |
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2 | # (C) British Crown Copyright 2006-17 Met Office. |
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3 | # |
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4 | # This file is part of FCM, tools for managing and building source code. |
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5 | # |
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6 | # FCM is free software: you can redistribute it and/or modify |
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7 | # it under the terms of the GNU General Public License as published by |
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8 | # the Free Software Foundation, either version 3 of the License, or |
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9 | # (at your option) any later version. |
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10 | # |
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11 | # FCM is distributed in the hope that it will be useful, |
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12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | # GNU General Public License for more details. |
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15 | # |
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16 | # You should have received a copy of the GNU General Public License |
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17 | # along with FCM. If not, see <http://www.gnu.org/licenses/>. |
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18 | # ------------------------------------------------------------------------------ |
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19 | use strict; |
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20 | use warnings; |
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21 | |
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22 | # ------------------------------------------------------------------------------ |
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23 | package FCM::Util::Locator::SSH; |
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24 | use base qw{FCM::Class::CODE}; |
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25 | |
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26 | use FCM::Util::Exception; |
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27 | use File::Temp; |
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28 | use Text::ParseWords qw{shellwords}; |
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29 | |
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30 | our %ACTION_OF = ( |
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31 | can_work_with => \&_can_work_with, |
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32 | can_work_with_rev => sub {}, |
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33 | cat => \&_cat, |
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34 | dir => \&_dir, |
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35 | export => \&_export, |
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36 | export_ok => sub {1}, |
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37 | find => \&_find, |
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38 | origin => \&_parse, |
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39 | parse => \&_parse, |
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40 | reader => \&_reader, |
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41 | read_property => sub {}, |
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42 | test_exists => \&_test_exists, |
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43 | trunk_at_head => sub {}, |
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44 | ); |
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45 | # Alias to the exception class |
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46 | my $E = 'FCM::Util::Exception'; |
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47 | |
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48 | # Creates the class. |
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49 | __PACKAGE__->class( |
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50 | {type_util_of => '%', util => '&'}, |
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51 | {action_of => \%ACTION_OF}, |
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52 | ); |
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53 | |
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54 | # Returns true if $value looks like a legitimate HOST:PATH. |
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55 | sub _can_work_with { |
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56 | my ($attrib_ref, $value) = @_; |
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57 | if (!$value) { |
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58 | return; |
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59 | } |
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60 | if (index($value, ':') < 0) { |
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61 | return; |
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62 | } |
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63 | my ($auth) = split(':', $value, 2); |
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64 | my $host = index($auth, '@') >= 0 ? (split('@', $auth, 2))[1] : $auth; |
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65 | $host ? gethostbyname($host) : undef; |
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66 | } |
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67 | |
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68 | # Joins @paths to the end of $value. |
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69 | sub _cat { |
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70 | my ($attrib_ref, $value, @paths) = @_; |
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71 | my ($auth, $path) = split(':', $value, 2); |
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72 | $auth . ':' . $attrib_ref->{type_util_of}{fs}->cat($path, @paths); |
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73 | } |
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74 | |
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75 | # Returns the directory name of $value. |
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76 | sub _dir { |
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77 | my ($attrib_ref, $value) = @_; |
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78 | my ($auth, $path) = split(':', $value, 2); |
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79 | $auth . ':' . $attrib_ref->{type_util_of}{fs}->dir($path); |
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80 | } |
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81 | |
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82 | # Rsync $value to $dest. |
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83 | sub _export { |
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84 | my ($attrib_ref, $value, $dest) = @_; |
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85 | my ($auth, $path) = _dir($attrib_ref, $value); |
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86 | my $value_hash_ref = $attrib_ref->{util}->shell_simple([ |
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87 | _shell_cmd_list($attrib_ref, 'rsync'), |
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88 | $value . '/', |
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89 | $dest, |
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90 | ]); |
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91 | if ($value_hash_ref->{rc}) { |
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92 | die($value_hash_ref); |
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93 | } |
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94 | } |
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95 | |
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96 | # Searches directory tree. |
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97 | sub _find { |
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98 | my ($attrib_ref, $value, $callback) = @_; |
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99 | my ($auth, $path) = split(':', $value, 2); |
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100 | my $value_hash_ref = $attrib_ref->{util}->shell_simple([ |
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101 | _shell_cmd_list($attrib_ref, 'ssh'), |
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102 | $auth, |
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103 | "find $path -type f -not -path \"*/.*\" -printf \"%T@ %p\\\\n\"", |
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104 | ]); |
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105 | if ($value_hash_ref->{rc}) { |
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106 | die($value_hash_ref); |
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107 | } |
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108 | my $found; |
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109 | LINE: |
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110 | for my $line (grep {$_} split("\n", $value_hash_ref->{o})) { |
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111 | $found ||= 1; |
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112 | my ($mtime, $name) = split(q{ }, $line, 2); |
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113 | my $ns = substr($name, length($path) + 1); |
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114 | $callback->( |
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115 | $auth . ':' . $name, |
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116 | { is_dir => undef, |
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117 | last_mod_rev => undef, |
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118 | last_mod_time => $mtime, |
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119 | ns => $ns, |
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120 | }, |
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121 | ); |
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122 | } |
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123 | $found; |
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124 | } |
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125 | |
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126 | # Returns a reader (file handle) for a given file system value. |
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127 | sub _reader { |
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128 | my ($attrib_ref, $value) = @_; |
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129 | my ($auth, $path) = split(':', $value, 2); |
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130 | my $handle = File::Temp->new(); |
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131 | my $e; |
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132 | my $rc = $attrib_ref->{util}->shell( |
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133 | [_shell_cmd_list($attrib_ref, 'ssh'), $auth, 'cat', $path], |
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134 | {'e' => \$e, 'o' => sub {print($handle $_[0])}}, |
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135 | ); |
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136 | if ($rc) { |
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137 | die($e); |
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138 | } |
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139 | seek($handle, 0, 0); |
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140 | return $handle; |
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141 | } |
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142 | |
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143 | # Returns $value in scalar context, or ($value,undef) in list context. |
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144 | sub _parse { |
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145 | my ($attrib_ref, $value) = @_; |
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146 | my ($auth, $path) = split(':', $value, 2); |
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147 | $value = $auth . ':' . $attrib_ref->{type_util_of}{fs}->parse($path); |
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148 | return (wantarray() ? ($value, undef) : $value); |
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149 | } |
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150 | |
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151 | # Return a true value if the location $value exists. |
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152 | sub _test_exists { |
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153 | my ($attrib_ref, $value) = @_; |
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154 | my ($auth, $path) = split(':', $value, 2); |
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155 | my $value_hash_ref = $attrib_ref->{util}->shell_simple([ |
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156 | _shell_cmd_list($attrib_ref, 'ssh'), $auth, "test -e '$path'", |
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157 | ]); |
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158 | return !$value_hash_ref->{rc}; |
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159 | } |
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160 | |
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161 | # Get a named command and its flags, return a list. |
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162 | sub _shell_cmd_list { |
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163 | my ($attrib_ref, $key) = @_; |
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164 | map {shellwords($_)} ( |
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165 | $attrib_ref->{util}->external_cfg_get($key), |
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166 | $attrib_ref->{util}->external_cfg_get($key . '.flags'), |
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167 | ); |
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168 | } |
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169 | |
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170 | # ------------------------------------------------------------------------------ |
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171 | 1; |
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172 | __END__ |
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173 | |
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174 | =head1 NAME |
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175 | |
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176 | FCM::Util::Locator::SSH |
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177 | |
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178 | =head1 SYNOPSIS |
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179 | |
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180 | use FCM::Util::Locator::SSH; |
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181 | $util = FCM::Util::Locator::SSH->new(\%option); |
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182 | $handle = $util->reader($value); |
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183 | |
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184 | =head1 DESCRIPTION |
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185 | |
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186 | Provides utilities to manipulate the values of locators on file systems on |
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187 | remote hosts accessible via SSH and RSYNC. |
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188 | |
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189 | =head1 METHODS |
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190 | |
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191 | =over 4 |
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192 | |
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193 | =item $util->can_work_with($value) |
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194 | |
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195 | Returns true if $value is in the form AUTH:PATH and AUTH is a valid user@host. |
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196 | |
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197 | =item $util->can_work_with_rev($revision) |
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198 | |
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199 | Dummy. Always returns false. |
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200 | |
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201 | =item $util->cat($value,@paths) |
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202 | |
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203 | Joins @paths to the end of $value. |
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204 | |
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205 | =item $util->dir($value) |
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206 | |
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207 | Returns the auth:parent-directory of $value. |
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208 | |
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209 | =item $util->export($value,$dest) |
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210 | |
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211 | Rsync a clean directory tree of $value to $dest. |
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212 | |
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213 | =item $util->export_ok($value) |
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214 | |
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215 | Returns true if $util->can_work_with($value). |
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216 | |
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217 | =item $util->find($value,$callback) |
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218 | |
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219 | Searches directory tree of $value. |
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220 | |
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221 | =item $util->origin($value) |
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222 | |
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223 | Alias of $util->parse($value). |
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224 | |
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225 | =item $util->parse($value) |
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226 | |
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227 | In scalar context, returns $value. In list context, returns ($value,undef). |
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228 | |
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229 | =item $util->reader($value) |
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230 | |
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231 | Returns a file handle for $value, if it is a readable regular file. |
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232 | |
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233 | =item $util->read_property($value,$property_name) |
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234 | |
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235 | Dummy. Always returns undef. |
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236 | |
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237 | =item $util->test_exists($value) |
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238 | |
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239 | Return a true value if the location $value exists. |
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240 | |
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241 | =item $util->trunk_at_head($value) |
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242 | |
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243 | Dummy. Always returns undef. |
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244 | |
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245 | =back |
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246 | |
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247 | =head1 COPYRIGHT |
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248 | |
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249 | (C) Crown copyright Met Office. All rights reserved. |
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250 | |
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251 | =cut |
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