From 2a387b17c5bc5e0872bed352a41a2b312ea86f9b Mon Sep 17 00:00:00 2001 From: Alex Vandiver Date: Tue, 3 Oct 2017 23:27:46 -0700 Subject: fsmonitor: read entirety of watchman output In Perl, setting $/ sets the string that is used as the "record separator," which sets the boundary that the `<>` construct reads to. Setting `local $/ = 0666;` evaluates the octal, getting 438, and stringifies it. Thus, the later read from `` stops as soon as it encounters the string "438" in the watchman output, yielding invalid JSON; repositories containing filenames with SHA1 hashes are able to trip this easily. Set `$/` to undefined, thus slurping all output from watchman. Also close STDIN which is provided to watchman, to better guarantee that we cannot deadlock with watchman while both attempting to read. Signed-off-by: Alex Vandiver Signed-off-by: Junio C Hamano --- templates/hooks--fsmonitor-watchman.sample | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'templates') diff --git a/templates/hooks--fsmonitor-watchman.sample b/templates/hooks--fsmonitor-watchman.sample index c68038ef00..9eba8a7409 100755 --- a/templates/hooks--fsmonitor-watchman.sample +++ b/templates/hooks--fsmonitor-watchman.sample @@ -49,9 +49,6 @@ launch_watchman(); sub launch_watchman { - # Set input record separator - local $/ = 0666; - my $pid = open2(\*CHLD_OUT, \*CHLD_IN, 'watchman -j') or die "open2() failed: $!\n" . "Falling back to scanning...\n"; @@ -78,7 +75,8 @@ sub launch_watchman { END print CHLD_IN $query; - my $response = ; + close CHLD_IN; + my $response = do {local $/; }; die "Watchman: command returned no output.\n" . "Falling back to scanning...\n" if $response eq ""; -- cgit v1.2.3