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#!/usr/bin/perl | |
use strict; | |
use warnings; | |
use IPC::Open2; | |
# An example hook script to integrate Watchman | |
# (https://facebook.github.io/watchman/) with git to speed up detecting | |
# new and modified files. | |
# | |
# The hook is passed a version (currently 1) and a time in nanoseconds | |
# formatted as a string and outputs to stdout all files that have been | |
# modified since the given time. Paths must be relative to the root of | |
# the working tree and separated by a single NUL. | |
# | |
# To enable this hook, rename this file to "query-watchman" and set | |
# 'git config core.fsmonitor .git/hooks/query-watchman' | |
# | |
my ($version, $time) = @ARGV; | |
# Check the hook interface version | |
if ($version == 1) { | |
# convert nanoseconds to seconds | |
$time = int $time / 1000000000; | |
} else { | |
die "Unsupported query-fsmonitor hook version '$version'.\n" . | |
"Falling back to scanning...\n"; | |
} | |
my $git_work_tree; | |
if ($^O =~ 'msys' || $^O =~ 'cygwin') { | |
$git_work_tree = Win32::GetCwd(); | |
$git_work_tree =~ tr/\\/\//; | |
} else { | |
require Cwd; | |
$git_work_tree = Cwd::cwd(); | |
} | |
my $retry = 1; | |
launch_watchman(); | |
sub launch_watchman { | |
my $pid = open2(\*CHLD_OUT, \*CHLD_IN, 'watchman -j --no-pretty') | |
or die "open2() failed: $!\n" . | |
"Falling back to scanning...\n"; | |
# In the query expression below we're asking for names of files that | |
# changed since $time but were not transient (ie created after | |
# $time but no longer exist). | |
# | |
# To accomplish this, we're using the "since" generator to use the | |
# recency index to select candidate nodes and "fields" to limit the | |
# output to file names only. Then we're using the "expression" term to | |
# further constrain the results. | |
# | |
# The category of transient files that we want to ignore will have a | |
# creation clock (cclock) newer than $time_t value and will also not | |
# currently exist. | |
my $query = <<" END"; | |
["query", "$git_work_tree", { | |
"since": $time, | |
"fields": ["name"], | |
"expression": ["not", ["allof", ["since", $time, "cclock"], ["not", "exists"]]] | |
}] | |
END | |
print CHLD_IN $query; | |
close CHLD_IN; | |
my $response = do {local $/; <CHLD_OUT>}; | |
die "Watchman: command returned no output.\n" . | |
"Falling back to scanning...\n" if $response eq ""; | |
die "Watchman: command returned invalid output: $response\n" . | |
"Falling back to scanning...\n" unless $response =~ /^\{/; | |
my $json_pkg; | |
eval { | |
require JSON::XS; | |
$json_pkg = "JSON::XS"; | |
1; | |
} or do { | |
require JSON::PP; | |
$json_pkg = "JSON::PP"; | |
}; | |
my $o = $json_pkg->new->utf8->decode($response); | |
if ($retry > 0 and $o->{error} and $o->{error} =~ m/unable to resolve root .* directory (.*) is not watched/) { | |
print STDERR "Adding '$git_work_tree' to watchman's watch list.\n"; | |
$retry--; | |
qx/watchman watch "$git_work_tree"/; | |
die "Failed to make watchman watch '$git_work_tree'.\n" . | |
"Falling back to scanning...\n" if $? != 0; | |
# Watchman will always return all files on the first query so | |
# return the fast "everything is dirty" flag to git and do the | |
# Watchman query just to get it over with now so we won't pay | |
# the cost in git to look up each individual file. | |
print "/\0"; | |
eval { launch_watchman() }; | |
exit 0; | |
} | |
die "Watchman: $o->{error}.\n" . | |
"Falling back to scanning...\n" if $o->{error}; | |
binmode STDOUT, ":utf8"; | |
local $, = "\0"; | |
print @{$o->{files}}; | |
} | |