| #!/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; |
| #print STDERR "$0 $version $time\n"; |
| |
| # Check the hook interface version |
| |
| if ($version == 1) { |
| # convert nanoseconds to seconds |
| # subtract one second to make sure watchman will return all changes |
| $time = int ($time / 1000000000) - 1; |
| } else { |
| exit 1; |
| } |
| |
| 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') |
| 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. |
| |
| my $query = <<" END"; |
| ["query", "$git_work_tree", { |
| "since": $time, |
| "fields": ["name"] |
| }] |
| END |
| |
| open (my $fh, ">", ".git/watchman-query.json"); |
| print $fh $query; |
| close $fh; |
| |
| print CHLD_IN $query; |
| close CHLD_IN; |
| my $response = do {local $/; <CHLD_OUT>}; |
| |
| open ($fh, ">", ".git/watchman-response.json"); |
| print $fh $response; |
| close $fh; |
| |
| 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 $? != 0; |
| |
| # Watchman will always return all files on the first query so |
| # return the fast "everything is dirty" flag to git and do the |
| # Watchman query just to get it over with now so we won't pay |
| # the cost in git to look up each individual file. |
| |
| open ($fh, ">", ".git/watchman-output.out"); |
| print "/\0"; |
| close $fh; |
| |
| print "/\0"; |
| eval { launch_watchman() }; |
| exit 0; |
| } |
| |
| die "Watchman: $o->{error}.\n" . |
| "Falling back to scanning...\n" if $o->{error}; |
| |
| open ($fh, ">", ".git/watchman-output.out"); |
| binmode $fh, ":utf8"; |
| print $fh @{$o->{files}}; |
| close $fh; |
| |
| binmode STDOUT, ":utf8"; |
| local $, = "\0"; |
| print @{$o->{files}}; |
| } |