Till Toenshoff created MESOS-1102:
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Summary: Add ability to process::subprocess to run function within
child context
Key: MESOS-1102
URL: https://issues.apache.org/jira/browse/MESOS-1102
Project: Mesos
Issue Type: Improvement
Components: libprocess
Affects Versions: 0.19.0
Reporter: Till Toenshoff
Priority: Minor
I would like to propose the addition of a way to run a function within the
forked child context to process::subprocess.
The subprocess implementation is already extremely valuable and will allow us
to remove many scattered, similar implementations within mesos once it is
flexible enough.
The recent addition (in review) of adding an environment map is just the right
step into that direction.
However, there still are areas, mostly within containerizer specifics that can
not be replaced by the subprocess implementation as is, IMHO because running a
function in the child context is missing. See e.g.
/src/slave/containerizer/launcher.cpp,
/src/slave/containerizer/mesos_containerizer.cpp and last but not least the
pluggable_containerizer (in review).
My envisioned approach would look something like this:
<pre>
// Runs the provided command in a subprocess.
// NOTE: Take extra care about the design of the inChild
// lambda as it must not contain any async unsafe code.
Try<Subprocess> subprocess(
const std::string& command,
const std::map<std::string, std::string>& env = std::map<std::string,
std::string>(),
const lambda::function<void()>& inChild = NULL);
</pre>
Please let me know what you think about this or if I was on a wrong track.
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