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1 #!/usr/bin/perl
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2
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3 use strict;
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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
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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 1) and a time in nanoseconds
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12 # formatted as a string and outputs to stdout all files that have been
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13 # modified since the given time. Paths must be relative to the root of
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14 # the working tree and separated by a single NUL.
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15 #
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16 # To enable this hook, rename this file to "query-watchman" and set
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17 # 'git config core.fsmonitor .git/hooks/query-watchman'
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18 #
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19 my ($version, $time) = @ARGV;
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20
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21 # Check the hook interface version
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22
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23 if ($version == 1) {
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24 # convert nanoseconds to seconds
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25 $time = int $time / 1000000000;
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26 } else {
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27 die "Unsupported query-fsmonitor hook version '$version'.\n" .
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28 "Falling back to scanning...\n";
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29 }
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30
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31 my $git_work_tree;
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32 if ($^O =~ 'msys' || $^O =~ 'cygwin') {
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33 $git_work_tree = Win32::GetCwd();
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34 $git_work_tree =~ tr/\\/\//;
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35 } else {
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36 require Cwd;
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37 $git_work_tree = Cwd::cwd();
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38 }
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39
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40 my $retry = 1;
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41
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42 launch_watchman();
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43
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44 sub launch_watchman {
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45
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46 my $pid = open2(\*CHLD_OUT, \*CHLD_IN, 'watchman -j --no-pretty')
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47 or die "open2() failed: $!\n" .
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48 "Falling back to scanning...\n";
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49
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50 # In the query expression below we're asking for names of files that
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51 # changed since $time but were not transient (ie created after
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52 # $time but no longer exist).
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53 #
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54 # To accomplish this, we're using the "since" generator to use the
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55 # recency index to select candidate nodes and "fields" to limit the
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56 # output to file names only. Then we're using the "expression" term to
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57 # further constrain the results.
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58 #
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59 # The category of transient files that we want to ignore will have a
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60 # creation clock (cclock) newer than $time_t value and will also not
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61 # currently exist.
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62
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63 my $query = <<" END";
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64 ["query", "$git_work_tree", {
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65 "since": $time,
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66 "fields": ["name"],
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67 "expression": ["not", ["allof", ["since", $time, "cclock"], ["not", "exists"]]]
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68 }]
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69 END
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70
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71 print CHLD_IN $query;
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72 close CHLD_IN;
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73 my $response = do {local $/; <CHLD_OUT>};
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74
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75 die "Watchman: command returned no output.\n" .
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76 "Falling back to scanning...\n" if $response eq "";
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77 die "Watchman: command returned invalid output: $response\n" .
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78 "Falling back to scanning...\n" unless $response =~ /^\{/;
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79
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80 my $json_pkg;
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81 eval {
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82 require JSON::XS;
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83 $json_pkg = "JSON::XS";
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84 1;
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85 } or do {
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86 require JSON::PP;
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87 $json_pkg = "JSON::PP";
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88 };
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89
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90 my $o = $json_pkg->new->utf8->decode($response);
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91
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92 if ($retry > 0 and $o->{error} and $o->{error} =~ m/unable to resolve root .* directory (.*) is not watched/) {
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93 print STDERR "Adding '$git_work_tree' to watchman's watch list.\n";
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94 $retry--;
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95 qx/watchman watch "$git_work_tree"/;
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96 die "Failed to make watchman watch '$git_work_tree'.\n" .
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97 "Falling back to scanning...\n" if $? != 0;
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98
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99 # Watchman will always return all files on the first query so
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100 # return the fast "everything is dirty" flag to git and do the
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101 # Watchman query just to get it over with now so we won't pay
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102 # the cost in git to look up each individual file.
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103 print "/\0";
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104 eval { launch_watchman() };
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105 exit 0;
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106 }
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107
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108 die "Watchman: $o->{error}.\n" .
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109 "Falling back to scanning...\n" if $o->{error};
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110
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111 binmode STDOUT, ":utf8";
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112 local $, = "\0";
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113 print @{$o->{files}};
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114 }
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