[olug] Bash or CygWin quirk waiting for process...

[Dan Linder]

Ok finally found the solution provided by Dave Walker (OLUG lurker).

Use the "--nodaemon" command line option as documented in "
https://mintty.github.io/mintty.1.html" but NOT in the "mintty --help"
output for some reason...

Here's my script that waits for the two "mintty" commands to exit:

#!/bin/bash
echo Building RHEL 6 template
mintty --nodaemon -t RHEL-6 --exec ./build_rhel.sh internal_wcprod 6 &

echo Building RHEL 7 template
mintty --nodaemon -t RHEL-7 --exec ./build_rhel.sh internal_wcprod 7 &

#
https://stackoverflow.com/questions/356100/how-to-wait-in-bash-for-several-subprocesses-to-finish-and-return-exit-code-0
echo Waiting jobs to exit: `jobs -p`
wait
EC=$?
echo "Jobs all exited (exit code: ${EC})"


Thanks again to all who helped!

Dan


On Tue, Jul 4, 2017 at 12:44 PM, Jay Bendon <jaybocc2 at gmail.com> wrote:

> try
>
> bash -c "mintty -t Type-A --exec ./build.sh typeA" &
> bash -c "mintty -t Type-A --exec ./build.sh typeB" &
> jobs -p
> wait
>
> --Jay
>
> On Mon, Jul 3, 2017 at 7:57 AM, Dan Linder <dan at linder.org> wrote:
>
> > Thanks for the responses, sorry for the slot reply with update.
> >
> > I made a simple script with just these lines in a file:
> >
> > /usr/bin/mintty /usr/bin/bash &
> > /usr/bin/mintty /usr/bin/bash &
> > jobs -p
> > wait
> >
> >
> > Running that file in the Git bash (/usr/bin/bash version 4.4.12) on my
> > Windows 10 system the terminal windows open, the "jobs -p" shows the two
> > PIDs, but the script exits seemingly ignoring the "wait".
> >
> > The wait command works if I replace the mintty calls with sleep commands
> > like this:
> >
> > sleep 3 &
> > sleep 5 &
> > jobs -p
> > wait
> >
> >
> > The "jobs -p" output shows the new PIDs, AND the wait command holds up
> the
> > script until both of the sleeps exit.  Thinking it might be related to
> > calling another binary, I made a small sleep.sh script (contents: "sleep
> > $1") and executed "/usr/bin/bash sleep.sh 3" but the wait works as
> > expected.
> >
> > Thinking it was a problem with a new window being opened I replaced it
> with
> > /usr/bin/notepad but wait still works:
> >
> > /usr/bin/notepad /tmp/file1 &
> > /usr/bin/notepad /tmp/file2 &
> > jobs -p
> > wait
> >
> >
> > I don't know why "/usr/bin/mintty" is special but apparently it is
> > somehow.  Guess I'll keep plugging away at it and keep everyone informed
> if
> > I reach a breakthrough.
> >
> > Dan
> >
> > On Thu, Jun 29, 2017 at 6:19 PM, David Gilman <davidgilman1 at gmail.com>
> > wrote:
> >
> > > If you use wait without an argument it'll block until all child
> > > shells/processes finish.  So I think you can take out the for loop and
> > your
> > > use of jobs entirely, and your script becomes:
> > >
> > > mintty foo &
> > > mintty bar &
> > >
> > > wait
> > >
> > >
> > > On Thu, Jun 29, 2017 at 7:01 PM, Boian Berberov (Public) <
> > > bberberov at gmail.com> wrote:
> > >
> > > > You might have to trim the output of jobs -p.  Mine gives extra info.
> > > >
> > > > Respectfully,
> > > >
> > > > Boian Berberov
> > > > _________________________
> > > > https://boian.berberov.eu
> > > >
> > > > On 29/06/17 17:25, Dan Linder wrote:
> > > > > I'm using CygWin in Windows 10 to automate a process.  I have two
> > child
> > > > > shell scripts I want to kick off from my main script, but I want
> the
> > > main
> > > > > script to hang around until both of the child scripts are done.
> > > > >
> > > > > The two child scripts are called as processes of "mintty" so the
> > output
> > > > of
> > > > > each is in separate windows.
> > > > >
> > > > > Here's my script:
> > > > >
> > > > > #!/bin/bash
> > > > > mintty -t Type-A --exec ./build.sh typeA &
> > > > > mintty -t Type-B --exec ./build.sh typeB &
> > > > >
> > > > > for job in `jobs -p` ; do
> > > > >   echo Waiting for child $job of jobs: `jobs -p` to exit.
> > > > >   wait $job
> > > > > done
> > > > >
> > > > > ./process_both.sh
> > > > >
> > > > >
> > > > > Both of the MinTTY consoles open and run the script, but the wait
> > > > for-loop
> > > > > doesn't wait and the "process_both.sh" script fires right away.
> > > > >
> > > > > Any ideas?
> > > > >
> > > > > Dan
> > > > >
> > > > >
> > > > _______________________________________________
> > > > OLUG mailing list
> > > > OLUG at olug.org
> > > > https://lists.olug.org/mailman/listinfo/olug
> > > >
> > >
> > >
> > >
> > > --
> > > David Gilman
> > > :DG<
> > > _______________________________________________
> > > OLUG mailing list
> > > OLUG at olug.org
> > > https://lists.olug.org/mailman/listinfo/olug
> > >
> >
> >
> >
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-- 
***************** ************* *********** ******* ***** *** **
"If you wish to make an apple pie from scratch,
  you must first invent the universe."
  -- Carl Sagan

"Quis custodiet ipsos custodes?"
    (Who can watch the watchmen?)
    -- from the Satires of Juvenal

"I do not fear computers, I fear the lack of them."
    -- Isaac Asimov (Author)
** *** ***** ******* *********** ************* *****************