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src: allows escaping NODE_OPTIONS with backslashes
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The characters specified within NODE_OPTIONS can now be escaped, which
is handy especially in conjunction with `--require` (where the file path
might happen to contain spaces that shouldn't cause the option to be
split into two).

Fixes: #12971

PR-URL: #24065
Backport-PR-URL: #35342
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Refs: microsoft/vscode-js-debug#769
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Maël Nison authored and richardlau committed Oct 7, 2020
1 parent 3564424 commit 2eb6273
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Showing 4 changed files with 51 additions and 12 deletions.
7 changes: 7 additions & 0 deletions doc/api/cli.md
Expand Up @@ -642,6 +642,13 @@ if they had been specified on the command line before the actual command line
(so they can be overridden). Node.js will exit with an error if an option
that is not allowed in the environment is used, such as `-p` or a script file.

In case an option value happens to contain a space (for example a path listed in
`--require`), it must be escaped using double quotes. For example:

```bash
--require "./my path/file.js"
```

Node.js options that are allowed are:
- `--enable-fips`
- `--experimental-modules`
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50 changes: 38 additions & 12 deletions src/node.cc
Expand Up @@ -2610,23 +2610,49 @@ void Init(std::vector<std::string>* argv,

#if !defined(NODE_WITHOUT_NODE_OPTIONS)
std::string node_options;

if (SafeGetenv("NODE_OPTIONS", &node_options)) {
std::vector<std::string> env_argv;
// [0] is expected to be the program name, fill it in from the real argv.
env_argv.push_back(argv->at(0));

// Split NODE_OPTIONS at each ' ' character.
std::string::size_type index = std::string::npos;
do {
std::string::size_type prev_index = index;
index = node_options.find(' ', index + 1);
if (index - prev_index == 1) continue;

const std::string option = node_options.substr(
prev_index + 1, index - prev_index - 1);
if (!option.empty())
env_argv.emplace_back(std::move(option));
} while (index != std::string::npos);
bool is_in_string = false;
bool will_start_new_arg = true;
for (std::string::size_type index = 0;
index < node_options.size();
++index) {
char c = node_options.at(index);

// Backslashes escape the following character
if (c == '\\' && is_in_string) {
if (index + 1 == node_options.size()) {
fprintf(stderr, "invalid value for NODE_OPTIONS "
"(invalid escape)\n");
exit(9);
} else {
c = node_options.at(++index);
}
} else if (c == ' ' && !is_in_string) {
will_start_new_arg = true;
continue;
} else if (c == '"') {
is_in_string = !is_in_string;
continue;
}

if (will_start_new_arg) {
env_argv.push_back(std::string(1, c));
will_start_new_arg = false;
} else {
env_argv.back() += c;
}
}

if (is_in_string) {
fprintf(stderr, "invalid value for NODE_OPTIONS "
"(unterminated string)\n");
exit(9);
}


ProcessArgv(&env_argv, nullptr, true);
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1 change: 1 addition & 0 deletions test/fixtures/print A.js
@@ -0,0 +1 @@
console.log('A')
5 changes: 5 additions & 0 deletions test/parallel/test-cli-node-options.js
Expand Up @@ -15,7 +15,12 @@ tmpdir.refresh();
process.chdir(tmpdir.path);

const printA = require.resolve('../fixtures/printA.js');
const printSpaceA = require.resolve('../fixtures/print A.js');

expect(` -r ${printA} `, 'A\nB\n');
expect(`-r ${printA}`, 'A\nB\n');
expect(`-r ${JSON.stringify(printA)}`, 'A\nB\n');
expect(`-r ${JSON.stringify(printSpaceA)}`, 'A\nB\n');
expect(`-r ${printA} -r ${printA}`, 'A\nB\n');
expect('--no-deprecation', 'B\n');
expect('--no-warnings', 'B\n');
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