Function parseVersion

src/linux/perf.cpp:212–226

Since there is a lot of variety in perf(1) version strings across distributions, we parse just the first 2 version components, which is enough of a version number to implement perf::supported().

// components, which is enough of a version number to implement
// perf::supported().
Try<Version> parseVersion(const string& output)
{
  // Trim off the leading 'perf version ' text to convert.
  string trimmed = strings::remove(
      strings::trim(output), "perf version ", strings::PREFIX);

  vector<string> components = strings::split(trimmed, ".");

  // perf(1) always has a version with least 2 components.
  if (components.size() > 2) {
    components.resize(2);
  }

  return Version::parse(strings::join(".", components));
}


bool supported(const Version& version)