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fsmonitor: query watchman with right valid json 

In rare circumstances where the current git index does not carry the
last_update_token, the fsmonitor v2 hook will be invoked with an
empty string which would caused the final rendered json to be invalid.

  ["query", "/path/to/my/git/repository/", {
          "since": ,
          "fields": ["name"],
          "expression": ["not", ["dirname", ".git"]]
  }]

Which will left user with the following error message

  > git status
  failed to parse command from stdin: line 2, column 13, position 67: unexpected token near ','
  Watchman: command returned no output.
  Falling back to scanning...

Hide the "since" field in json query when "last_update_token" is empty.

Co-authored-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Son Luong Ngoc <sluongng@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Son Luong Ngoc 2022-06-07 13:14:19 +02:00 committed by Junio C Hamano
parent e54793a95a
commit 134047b500
1 changed files with 3 additions and 2 deletions
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5
templates/hooks--fsmonitor-watchman.sample
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@ -86,12 +86,13 @@ sub watchman_query {
# recency index to select candidate nodes and "fields" to limit the
# output to file names only. Then we're using the "expression" term to
# further constrain the results.
my $last_update_line = "";
if (substr($last_update_token, 0, 1) eq "c") {
$last_update_token = "\"$last_update_token\"";
$last_update_line = qq[\n"since": $last_update_token,];
}
my $query = <<" END";
["query", "$git_work_tree", {
"since": $last_update_token,
["query", "$git_work_tree", {$last_update_line
"fields": ["name"],
"expression": ["not", ["dirname", ".git"]]
}]