Timeout child about tini HOT 9 CLOSED

Couldn't this be implemented easily with the "timeout" tool without having tini implement this itself?

ie,

$ docker run -it --rm debian:jessie timeout 5s sleep 10
$ echo $?
124
$ docker run -it --rm debian:jessie timeout 10s sleep 5
$ echo $?
0

from tini.

Counter example (busybox implementation of timeout):

/ # timeout -t 1 sh -c 'sleep 2 && echo foo &'
/ # foo

Point being: if the child forks & exits, timeout will exit with status 0.

from tini.

Correct, I get that same problem when using timeout -t 1 sh -c 'sleep 2 && echo foo &' on debian. Your example would not run in tini in docker anyway since the process that tini would be tracking would have exited, making tini exit, and thus the container would be destroyed (ie, docker run -it --rm busybox sh -c 'sleep 10 && echo foo &' dies immediately, whether or not I use any combination of tini and timeout).

from tini.

Yeah, i have chosen a bad example there. I will think of another one if necessary.

from tini.

Hey @danilobuerger , thanks for your suggestion!

So, this feels a bit more involved that I'd intuitively envision Tini supporting (though that doesn't necessarily mean much... intuition can be wrong!)

But, for what it's worth, I'm working on having pre / post commands in #28 that run (as the name implies) before Tini starts your child and after it exits.

I think this feature would let you solve this problem without any additional work in Tini. Just point --pre to an executable file containing the following script (e.g. pre.sh):

#!/bin/sh
sh -c 'sleep 10 && echo "TIMEOUT" && kill -s TERM 1' &

Then, run:

tini --pre pre.sh -- your program goes here

And that should actually work (I've just tested it locally)

(you could use KILL as well, which would kill Tini immediately and not your child, but yield a non-zero exit code just the same — and of course with a little more shell work you can send KILL directly to the child)

What do you think? If you want to try it out, the feature's already coded, so you can re-compile Tini and try it now.

Cheers,

from tini.

Now that I think about it, you probably don't even need --pre to do this. Just use this as your ENTRYPOINT instead of using Tini directly:

#!/bin/sh
sh -c 'sleep 10 && echo "TIMEOUT" && kill -s TERM 1' &
exec tini -- sh -c 'sleep 20'

Cheers,

from tini.

Actually, never mind. I had an error in my thinking. Everyone else was correct :-).

from tini.

Glad you sorted this out then : )

from tini.

Just for future reference: @tianon was correct, the timeout will work fine.

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