fuzzer: add a cargo-bolero fuzz target type

[Ekleog]

This is untested yet, but I'm opening before doing a try-deploy on one of the nayduck machines so there's a trace of what's being deployed

[Ekleog]

I have now tested it on one worker (worker2), and can confirm that the current fuzzers seem to still work well with this change.

[mina86]

Didn’t notice this PR. Is this still a thing?

[Ekleog-NEAR]

Yup it is! I have deployed it only on worker2 for now and am planning on checking it actually works well with cargo-bolero fuzz targets too before proceeding with deployment, but it can already be reviewed and should undergo only minor changes on the cargo-bolero branch of the if :)

[mina86]

Alternatively:

Suggested change

	if self.target.get('type') == 'bolero':
	self.proc = subprocess.Popen(
	[
	'cargo',
	'bolero',
	'test',
	'--fake-nightly-toolchain',
	f'--corpus-dir={corpus.corpus_for(self.target)}',
	f'--crashes-dir={corpus.artifacts_for(self.target)}',
	'-p',
	self.target['crate'],
	self.target['runner'],
	] + [f'--engine-args="{flag}"' for flag in flags],
	cwd = self.repo_dir,
	start_new_session = True,
	stdout = self.log_file,
	stderr = subprocess.STDOUT,
	)
	else:
	self.proc = subprocess.Popen( # pylint: disable=consider-using-with
	[
	'cargo',
	'fuzz',
	'run',
	self.target['runner'],
	'--',
	str(corpus.corpus_for(self.target)),
	str(corpus.artifacts_for(self.target)),
	f'-artifact_prefix={corpus.artifacts_for(self.target)}/',
	] + flags,
	cwd=self.repo_dir / self.target['crate'],
	start_new_session=True,
	stdout=self.log_file,
	stderr=subprocess.STDOUT,
	)
	if self.target.get('type') == 'bolero':
	cmd = [
	'cargo',
	'bolero',
	'test',
	'--fake-nightly-toolchain',
	f'--corpus-dir={corpus.corpus_for(self.target)}',
	f'--crashes-dir={corpus.artifacts_for(self.target)}',
	'-p',
	self.target['crate'],
	self.target['runner'],
	] + [f'--engine-args="{flag}"' for flag in flags]
	cwd = self.repo_dir
	else:
	cmd = [
	'cargo',
	'fuzz',
	'run',
	self.target['runner'],
	'--',
	str(corpus.corpus_for(self.target)),
	str(corpus.artifacts_for(self.target)),
	f'-artifact_prefix={corpus.artifacts_for(self.target)}/',
	] + flags
	cwd = self.repo_dir / self.target['crate']
	self.proc = subprocess.Popen( # pylint: disable=consider-using-with
	cmd,
	cwd=cwd,
	start_new_session=True,
	stdout=self.log_file,
	stderr=subprocess.STDOUT,
	)