source: vendor/current/selftest/in_screen

#!/usr/bin/env bash

export TMPDIR="$SELFTEST_TMPDIR"

SERVERNAME="$ENVNAME"
[ -z "$SERVERNAME" ] && SERVERNAME="base"
basedir=$TMPDIR
osname=$(uname)
if [ "$osname" = "Linux" ]; then
        vars=$(mktemp)
else
        vars=$(mktemp -t tmpsmb)
        function seq() {
                dpt=$1
                end=$2
                while [ $dpt -le $end ]; do
                        echo "$dpt"
                        dpt=$(( $dpt + 1))
                done
        }
fi

[ -r $basedir/$SERVERNAME.pid ] && {
    for i in $(seq 2 100); do
        if [ ! -r "$basedir/${SERVERNAME}-$i.pid" ]; then
            SERVERNAME="${SERVERNAME}-$i"
            break
        fi
    done
}

rm -f $basedir/$SERVERNAME.*

# set most of the environment vars we have in the screen session too
_ENV=""
printenv |
  egrep -v '^TERMCAP|^WINDOW|^SHELL|^STY|^SHLVL|^SAMBA_VALGRIND|\$' |
  egrep '^[A-Z]' |
  sed "s/\(^[^=]*=\)\(.*\)/export \1'\2'/g" > $basedir/$SERVERNAME.vars

cat <<EOF > $basedir/$SERVERNAME.launch
cd $PWD
 echo \$\$ > $basedir/$SERVERNAME.pid
 . $basedir/$SERVERNAME.vars
 echo "\$(date) starting $SERVERNAME" >> $basedir/$SERVERNAME.log
 $@
 echo \$? > $basedir/$SERVERNAME.status
 read parent < $basedir/$SERVERNAME.parent.pid
 kill \$parent
EOF
pid=$$

cleanup() {
    trap "exit 1" SIGINT SIGTERM SIGPIPE
    [ -r $basedir/$SERVERNAME.status ] && {
        read status < $basedir/$SERVERNAME.status
        echo "$(date) samba exited with status $status" >> $basedir/$SERVERNAME.log
        exit $status
    }
    read pid < $basedir/$SERVERNAME.pid
    echo "$(date) Killing samba pid $pid from $$" >> $basedir/$SERVERNAME.log
    if [ "$pid" = "$$" ]; then
        exit 1
    fi
    kill -9 $pid 2>&1
    exit 1
}

rm -f $basedir/$SERVERNAME.status $basedir/$SERVERNAME.log
echo $$ > $basedir/$SERVERNAME.parent.pid
trap cleanup SIGINT SIGTERM SIGPIPE

if [[ "$TMUX" ]]; then
    TMUX_CMD=tmux
    if [[ $TMUX = *tmate* ]]; then
        TMUX_CMD=tmate
    fi

    $TMUX_CMD new-window -n test:$SERVERNAME "bash $basedir/$SERVERNAME.launch"
else
    screen -r -X screen -t test:$SERVERNAME bash $basedir/$SERVERNAME.launch
fi
echo "$(date) waiting in $$" >> $basedir/$SERVERNAME.log
read stdin_var
echo "$(date) EOF on stdin" >> $basedir/$SERVERNAME.log
read pid < $basedir/$SERVERNAME.pid
echo "$(date) killing $pid" >> $basedir/$SERVERNAME.log
kill $pid 2> /dev/null
echo "$(date) exiting" >> $basedir/$SERVERNAME.log
exit 0