f4609b896f
This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because there is some breakage in the git build related to the netrc credentials helper which someone has taken care of in nixpkgs. The stable channel is not used for anything other than git, so this should be fine. Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb
127 lines
3.3 KiB
Perl
Executable file
127 lines
3.3 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 1) and a time in nanoseconds
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# formatted as a string and outputs to stdout all files that have been
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# modified since the given time. Paths must be relative to the root of
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# 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, $time) = @ARGV;
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#print STDERR "$0 $version $time\n";
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# Check the hook interface version
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if ($version == 1) {
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# convert nanoseconds to seconds
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# subtract one second to make sure watchman will return all changes
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$time = int ($time / 1000000000) - 1;
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} else {
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exit 1;
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}
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my $git_work_tree;
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if ($^O =~ 'msys' || $^O =~ 'cygwin') {
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$git_work_tree = Win32::GetCwd();
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$git_work_tree =~ tr/\\/\//;
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} else {
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require Cwd;
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$git_work_tree = Cwd::cwd();
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}
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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')
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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 $time but were not transient (ie created after
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# $time but no longer exist).
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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.
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my $query = <<" END";
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["query", "$git_work_tree", {
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"since": $time,
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"fields": ["name"]
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}]
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END
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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 $/; <CHLD_OUT>};
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open ($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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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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my $o = $json_pkg->new->utf8->decode($response);
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if ($retry > 0 and $o->{error} and $o->{error} =~ m/unable to resolve root .* directory (.*) is not watched/) {
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print STDERR "Adding '$git_work_tree' to watchman's watch list.\n";
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$retry--;
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qx/watchman watch "$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 $? != 0;
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# Watchman will always return all files on the first query so
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# return the fast "everything is dirty" flag to git and do the
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# Watchman query just to get it over with now so we won't pay
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# the cost in git to look up each individual file.
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open ($fh, ">", ".git/watchman-output.out");
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print "/\0";
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close $fh;
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print "/\0";
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eval { launch_watchman() };
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exit 0;
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}
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die "Watchman: $o->{error}.\n" .
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"Falling back to scanning...\n" if $o->{error};
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open ($fh, ">", ".git/watchman-output.out");
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binmode $fh, ":utf8";
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print $fh @{$o->{files}};
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close $fh;
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binmode STDOUT, ":utf8";
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local $, = "\0";
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print @{$o->{files}};
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}
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