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Make exec Wait For Previous Exec To Complete

asked 2014-10-04 03:41:02 -0500

opticyclic gravatar image

My process is based on 3 execs:

  • Create schema using sqlplus
  • Populate schema from xml using java app1
  • Start java app2

I can't start the 2nd java app until the first one has complete as the database wont be fully populated. I use require to order them correctly but I can't get the wait part correct.

If I use unless and something like ps -ef|grep java app1 the 2nd java app wouldn't run at all.

How do I say "wait until this process is finished before running this next exec"?

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answered 2014-10-04 11:36:43 -0500

jonn gravatar image

It sounds like app1 is going into the background and populating the schema asynchronously. Is it possible to get the app to do this in the foreground and quit with an appropriate exit code when it has finished?

If not, then maybe you could have an extra exec in between those for app1 and app2. This exec could call a script that would poll the database periodically, and only return once it was satisfied that the schema had been populated correctly.

Or, if you don't need to trigger any other puppet resources from the sub-tasks, then you could put the whole "create schema/start app1/wait for schema population to complete/start app2" workflow into a single script, and use one exec for the lot.

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The background issue was spot on. I was calling a script that forks a process so wait wouldn't wait for the grandchild process. I did this to work around it. PID1=$(ps -ef|grep create-db|grep 'java -server'|grep -v grep|awk '{print $2}') while [ -e /proc/$PID1 ]; do sleep 1; done

opticyclic gravatar imageopticyclic ( 2014-10-04 17:53:26 -0500 )edit

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Asked: 2014-10-04 03:41:02 -0500

Seen: 1,306 times

Last updated: Oct 04 '14