Mercurial > repos > fubar > egapx_runner

annotate oldgit/hooks/fsmonitor-watchman.sample @ 2:a3b158471bd3 draft

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planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
author fubar
date Sun, 04 Aug 2024 00:06:43 +0000
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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1 #!/usr/bin/perl
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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2
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3 use strict;
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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4 use warnings;
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5 use IPC::Open2;
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6
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7 # An example hook script to integrate Watchman
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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8 # (https://facebook.github.io/watchman/) with git to speed up detecting
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9 # new and modified files.
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10 #
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11 # The hook is passed a version (currently 2) and last update token
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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12 # formatted as a string and outputs to stdout a new update token and
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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13 # all files that have been modified since the update token. Paths must
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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14 # be relative to the root of the working tree and separated by a single NUL.
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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15 #
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16 # To enable this hook, rename this file to "query-watchman" and set
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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17 # 'git config core.fsmonitor .git/hooks/query-watchman'
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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18 #
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19 my ($version, $last_update_token) = @ARGV;
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20
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21 # Uncomment for debugging
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22 # print STDERR "$0 $version $last_update_token\n";
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23
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24 # Check the hook interface version
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25 if ($version ne 2) {
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26 die "Unsupported query-fsmonitor hook version '$version'.\n" .
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27 "Falling back to scanning...\n";
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28 }
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29
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30 my $git_work_tree = get_working_dir();
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31
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32 my $retry = 1;
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33
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34 my $json_pkg;
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35 eval {
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36 require JSON::XS;
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37 $json_pkg = "JSON::XS";
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38 1;
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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39 } or do {
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40 require JSON::PP;
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41 $json_pkg = "JSON::PP";
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42 };
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43
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44 launch_watchman();
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45
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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46 sub launch_watchman {
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47 my $o = watchman_query();
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48 if (is_work_tree_watched($o)) {
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49 output_result($o->{clock}, @{$o->{files}});
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50 }
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51 }
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52
a3b158471bd3 planemo upload for repository https://github.com/ncbi/egapx commit 98875ef7eda9323fc9991970103954e9097d9e73
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53 sub output_result {
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54 my ($clockid, @files) = @_;
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55
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56 # Uncomment for debugging watchman output
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57 # open (my $fh, ">", ".git/watchman-output.out");
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58 # binmode $fh, ":utf8";
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59 # print $fh "$clockid\n@files\n";
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60 # close $fh;
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61
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62 binmode STDOUT, ":utf8";
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63 print $clockid;
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64 print "\0";
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65 local $, = "\0";
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66 print @files;
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67 }
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68
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69 sub watchman_clock {
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70 my $response = qx/watchman clock "$git_work_tree"/;
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71 die "Failed to get clock id on '$git_work_tree'.\n" .
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72 "Falling back to scanning...\n" if $? != 0;
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73
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74 return $json_pkg->new->utf8->decode($response);
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75 }
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76
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77 sub watchman_query {
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78 my $pid = open2(\*CHLD_OUT, \*CHLD_IN, 'watchman -j --no-pretty')
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79 or die "open2() failed: $!\n" .
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80 "Falling back to scanning...\n";
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81
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82 # In the query expression below we're asking for names of files that
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83 # changed since $last_update_token but not from the .git folder.
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84 #
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85 # To accomplish this, we're using the "since" generator to use the
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86 # recency index to select candidate nodes and "fields" to limit the
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87 # output to file names only. Then we're using the "expression" term to
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88 # further constrain the results.
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89 my $last_update_line = "";
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90 if (substr($last_update_token, 0, 1) eq "c") {
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91 $last_update_token = "\"$last_update_token\"";
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92 $last_update_line = qq[\n"since": $last_update_token,];
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93 }
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94 my $query = <<" END";
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95 ["query", "$git_work_tree", {$last_update_line
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96 "fields": ["name"],
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97 "expression": ["not", ["dirname", ".git"]]
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98 }]
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99 END
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100
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101 # Uncomment for debugging the watchman query
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102 # open (my $fh, ">", ".git/watchman-query.json");
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103 # print $fh $query;
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104 # close $fh;
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105
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106 print CHLD_IN $query;
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107 close CHLD_IN;
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108 my $response = do {local $/; <CHLD_OUT>};
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109
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110 # Uncomment for debugging the watch response
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111 # open ($fh, ">", ".git/watchman-response.json");
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112 # print $fh $response;
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113 # close $fh;
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114
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115 die "Watchman: command returned no output.\n" .
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116 "Falling back to scanning...\n" if $response eq "";
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117 die "Watchman: command returned invalid output: $response\n" .
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118 "Falling back to scanning...\n" unless $response =~ /^\{/;
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119
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120 return $json_pkg->new->utf8->decode($response);
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121 }
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122
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123 sub is_work_tree_watched {
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124 my ($output) = @_;
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125 my $error = $output->{error};
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126 if ($retry > 0 and $error and $error =~ m/unable to resolve root .* directory (.*) is not watched/) {
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127 $retry--;
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128 my $response = qx/watchman watch "$git_work_tree"/;
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129 die "Failed to make watchman watch '$git_work_tree'.\n" .
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130 "Falling back to scanning...\n" if $? != 0;
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131 $output = $json_pkg->new->utf8->decode($response);
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132 $error = $output->{error};
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133 die "Watchman: $error.\n" .
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134 "Falling back to scanning...\n" if $error;
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135
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136 # Uncomment for debugging watchman output
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137 # open (my $fh, ">", ".git/watchman-output.out");
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138 # close $fh;
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139
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140 # Watchman will always return all files on the first query so
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141 # return the fast "everything is dirty" flag to git and do the
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142 # Watchman query just to get it over with now so we won't pay
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143 # the cost in git to look up each individual file.
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144 my $o = watchman_clock();
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145 $error = $output->{error};
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146
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147 die "Watchman: $error.\n" .
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148 "Falling back to scanning...\n" if $error;
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149
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150 output_result($o->{clock}, ("/"));
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151 $last_update_token = $o->{clock};
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152
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153 eval { launch_watchman() };
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154 return 0;
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155 }
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156
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157 die "Watchman: $error.\n" .
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158 "Falling back to scanning...\n" if $error;
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159
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160 return 1;
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161 }
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162
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163 sub get_working_dir {
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164 my $working_dir;
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165 if ($^O =~ 'msys' || $^O =~ 'cygwin') {
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166 $working_dir = Win32::GetCwd();
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167 $working_dir =~ tr/\\/\//;
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168 } else {
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169 require Cwd;
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170 $working_dir = Cwd::cwd();
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171 }
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172
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173 return $working_dir;
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174 }