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Co-authored-by: 6543 <6543@obermui.de> Co-authored-by: jaqra <48099350+jaqra@users.noreply.github.com> Co-authored-by: Kerry <flatline-studios@users.noreply.github.com> Co-authored-by: Jaqra <jaqra@hotmail.com> Co-authored-by: Kyle Evans <kevans91@users.noreply.github.com> Co-authored-by: Tsakiridis Ilias <TsakiDev@users.noreply.github.com> Co-authored-by: Ilias Tsakiridis <ilias.tsakiridis@outlook.com> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
174 lines
4.5 KiB
Perl
Executable File
174 lines
4.5 KiB
Perl
Executable File
#!/usr/bin/perl
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use strict;
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use warnings;
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use IPC::Open2;
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# An example hook script to integrate Watchman
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# (https://facebook.github.io/watchman/) with git to speed up detecting
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# new and modified files.
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#
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# The hook is passed a version (currently 2) and last update token
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# formatted as a string and outputs to stdout a new update token and
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# all files that have been modified since the update token. Paths must
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# be relative to the root of the working tree and separated by a single NUL.
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#
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# To enable this hook, rename this file to "query-watchman" and set
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# 'git config core.fsmonitor .git/hooks/query-watchman'
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#
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my ($version, $last_update_token) = @ARGV;
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# Uncomment for debugging
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# print STDERR "$0 $version $last_update_token\n";
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# Check the hook interface version
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if ($version ne 2) {
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die "Unsupported query-fsmonitor hook version '$version'.\n" .
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"Falling back to scanning...\n";
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}
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my $git_work_tree = get_working_dir();
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my $retry = 1;
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my $json_pkg;
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eval {
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require JSON::XS;
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$json_pkg = "JSON::XS";
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1;
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} or do {
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require JSON::PP;
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$json_pkg = "JSON::PP";
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};
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launch_watchman();
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sub launch_watchman {
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my $o = watchman_query();
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if (is_work_tree_watched($o)) {
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output_result($o->{clock}, @{$o->{files}});
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}
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}
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sub output_result {
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my ($clockid, @files) = @_;
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# Uncomment for debugging watchman output
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# open (my $fh, ">", ".git/watchman-output.out");
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# binmode $fh, ":utf8";
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# print $fh "$clockid\n@files\n";
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# close $fh;
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binmode STDOUT, ":utf8";
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print $clockid;
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print "\0";
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local $, = "\0";
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print @files;
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}
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sub watchman_clock {
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my $response = qx/watchman clock "$git_work_tree"/;
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die "Failed to get clock id on '$git_work_tree'.\n" .
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"Falling back to scanning...\n" if $? != 0;
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return $json_pkg->new->utf8->decode($response);
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}
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sub watchman_query {
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my $pid = open2(\*CHLD_OUT, \*CHLD_IN, 'watchman -j --no-pretty')
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or die "open2() failed: $!\n" .
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"Falling back to scanning...\n";
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# In the query expression below we're asking for names of files that
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# changed since $last_update_token but not from the .git folder.
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#
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# To accomplish this, we're using the "since" generator to use the
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# recency index to select candidate nodes and "fields" to limit the
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# output to file names only. Then we're using the "expression" term to
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# further constrain the results.
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if (substr($last_update_token, 0, 1) eq "c") {
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$last_update_token = "\"$last_update_token\"";
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}
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my $query = <<" END";
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["query", "$git_work_tree", {
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"since": $last_update_token,
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"fields": ["name"],
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"expression": ["not", ["dirname", ".git"]]
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}]
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END
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# Uncomment for debugging the watchman query
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# open (my $fh, ">", ".git/watchman-query.json");
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# print $fh $query;
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# close $fh;
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print CHLD_IN $query;
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close CHLD_IN;
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my $response = do {local $/; <CHLD_OUT>};
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# Uncomment for debugging the watch response
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# open ($fh, ">", ".git/watchman-response.json");
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# print $fh $response;
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# close $fh;
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die "Watchman: command returned no output.\n" .
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"Falling back to scanning...\n" if $response eq "";
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die "Watchman: command returned invalid output: $response\n" .
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"Falling back to scanning...\n" unless $response =~ /^\{/;
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return $json_pkg->new->utf8->decode($response);
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}
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sub is_work_tree_watched {
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my ($output) = @_;
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my $error = $output->{error};
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if ($retry > 0 and $error and $error =~ m/unable to resolve root .* directory (.*) is not watched/) {
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$retry--;
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my $response = qx/watchman watch "$git_work_tree"/;
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die "Failed to make watchman watch '$git_work_tree'.\n" .
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"Falling back to scanning...\n" if $? != 0;
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$output = $json_pkg->new->utf8->decode($response);
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$error = $output->{error};
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die "Watchman: $error.\n" .
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"Falling back to scanning...\n" if $error;
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# Uncomment for debugging watchman output
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# open (my $fh, ">", ".git/watchman-output.out");
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# close $fh;
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# Watchman will always return all files on the first query so
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# return the fast "everything is dirty" flag to git and do the
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# Watchman query just to get it over with now so we won't pay
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# the cost in git to look up each individual file.
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my $o = watchman_clock();
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$error = $output->{error};
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die "Watchman: $error.\n" .
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"Falling back to scanning...\n" if $error;
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output_result($o->{clock}, ("/"));
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$last_update_token = $o->{clock};
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eval { launch_watchman() };
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return 0;
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}
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die "Watchman: $error.\n" .
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"Falling back to scanning...\n" if $error;
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return 1;
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}
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sub get_working_dir {
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my $working_dir;
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if ($^O =~ 'msys' || $^O =~ 'cygwin') {
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$working_dir = Win32::GetCwd();
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$working_dir =~ tr/\\/\//;
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} else {
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require Cwd;
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$working_dir = Cwd::cwd();
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}
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return $working_dir;
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}
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