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Merge pull request #212 fsmonitor updates for improved performance
fsmonitor updates for improved performance
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| #!/usr/bin/perl | ||
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| use strict; | ||
| use warnings; | ||
| use IPC::Open2; | ||
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| # 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; | ||
| #print STDERR "$0 $version $time\n"; | ||
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| # Check the hook interface version | ||
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| if ($version == 1) { | ||
| # convert nanoseconds to seconds | ||
| # subtract one second to make sure watchman will return all changes | ||
| $time = int ($time / 1000000000) - 1; | ||
| } else { | ||
| die "Unsupported query-fsmonitor hook version '$version'.\n" . | ||
| "Falling back to scanning...\n"; | ||
| } | ||
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| 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(); | ||
| } | ||
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| my $retry = 1; | ||
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| launch_watchman(); | ||
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| sub launch_watchman { | ||
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| my $pid = open2(\*CHLD_OUT, \*CHLD_IN, 'watchman -j') | ||
| or die "open2() failed: $!\n" . | ||
| "Falling back to scanning...\n"; | ||
|
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| # 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. | ||
|
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| my $query = <<" END"; | ||
| ["query", "$git_work_tree", { | ||
| "since": $time, | ||
| "fields": ["name"] | ||
| }] | ||
| END | ||
|
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| open (my $fh, ">", ".git/watchman-query.json"); | ||
| print $fh $query; | ||
| close $fh; | ||
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| print CHLD_IN $query; | ||
| close CHLD_IN; | ||
| my $response = do {local $/; <CHLD_OUT>}; | ||
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| open ($fh, ">", ".git/watchman-response.json"); | ||
| print $fh $response; | ||
| close $fh; | ||
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| 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 =~ /^\{/; | ||
|
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| my $json_pkg; | ||
| eval { | ||
| require JSON::XS; | ||
| $json_pkg = "JSON::XS"; | ||
| 1; | ||
| } or do { | ||
| require JSON::PP; | ||
| $json_pkg = "JSON::PP"; | ||
| }; | ||
|
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| my $o = $json_pkg->new->utf8->decode($response); | ||
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| 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 $? != 0; | ||
|
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| # Watchman will always return all files on the first query so | ||
| # return the fast "everything is dirty" flag to git and do the | ||
| # Watchman query just to get it over with now so we won't pay | ||
| # the cost in git to look up each individual file. | ||
|
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| open ($fh, ">", ".git/watchman-output.out"); | ||
| print "/\0"; | ||
| close $fh; | ||
|
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| print "/\0"; | ||
| eval { launch_watchman() }; | ||
| exit 0; | ||
| } | ||
|
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| die "Watchman: $o->{error}.\n" . | ||
| "Falling back to scanning...\n" if $o->{error}; | ||
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| open ($fh, ">", ".git/watchman-output.out"); | ||
| binmode $fh, ":utf8"; | ||
| print $fh @{$o->{files}}; | ||
| close $fh; | ||
|
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| binmode STDOUT, ":utf8"; | ||
| local $, = "\0"; | ||
| print @{$o->{files}}; | ||
| } |
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