Experimental Physics and
Industrial Control System

Am 23.11.20 um 12:05 schrieb Ralph Lange via Core-talk:
> On Mon, 23 Nov 2020 at 11:37, Zimoch Dirk (PSI) via Core-talk <
> core-talk at aps.anl.gov> wrote:
> 
>> One of my colleagues (Till Straumann) has implemented a modification of
>> EPICS mutexes (posix) to support priority inversion safety. (Originally for
>> 3.14.12 but I have ported the change to EPICS 7 now). But there are two
>> problems with the tests.
>> 1. For backward compatibility reasons, the change depends on an
>> environment variable which must be set before libCom is loaded. How to do
>> that for the test? In MAIN, it is too late. Doing it on the command line
>> does not seem to work well for ci.
>> 2. The fix depends on SCHED_FIFO which can only be set with sufficient
>> permissions. Thus, the test only succeeds as root and fails otherwise.
>>
>> How to handle this? Is there a method to set environment variables before
>> a specific test is run? (I could for course fork a new process but that
>> seems rather clumsy). Is isforseen to run tests as root (only)?
> 
> 
> Running tests under SCHED_FIFO would be a good achievement by itself.
> 
> Most CI services grant sudo rights on the runners (usually we're installing
> dependencies as packages). All services supported by ci-scripts
> <https://github.com/epics-base/ci-scripts> do; ci-scripts also allows to
> set environment variables for the jobs.
> In case you need changes in ci-scripts to do this properly and nicely, I'd
> be happy to help and/or accept PRs.

If you don't want to run as root, you could play with setpriv(1). From
capabilities(7) I gather that modifying the scheduling is covered by
CAP_SYS_NICE. Don't ask me about inheritable, ambient or bounding sets
though, I can't claim to understand the difference.

Cheers
Ben
-- 
Niemand hat das Recht zu gehorchen. -- Hannah Arendt

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References:

How to "tweek" tests? Zimoch Dirk (PSI) via Core-talk

Re: How to "tweak" tests? Ralph Lange via Core-talk

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