travis_wait_log

#!/usr/bin/env bash
set -e
if [[ "$1" =~ ^[1-9][0-9]*$ ]]; then # check if 1st param is number >0
  WAIT=$1; shift # set sleep parameter in minutes
fi
let WAIT=${WAIT:-5}*60 # default sleep time 5 minutes
[[ $1 ]] || exit 1 # exit if no command given as a parameter

finish() {
  ERR=$? # store exit code in safe place
  trap - ERR EXIT
  echo # end dots with new line
  if [[ -s "$LOG" ]]; then # display log file only if not empty
    echo -e "Last ${LINES:=500} lines of log:" # allow overwrite number of lines
    tail -$LINES "$LOG"
  fi
  kill $CHPID && wait &>>/dev/null # kill child displaying dots
  exit $ERR # restore exit code from executed command
}

: ${COLUMNS:=70} # allow overwrite number of dots in one line
echo Executing: $@
while sleep $WAIT; do echo -n .; ((++n%COLUMNS)) || echo; done &
CHPID=$! # store child PID for killing them after task terminate

: >"${LOG:=/tmp/travis_wait.log}" # allow overwrite log filename
trap finish ERR EXIT # display log & kill child at error or normal exit
( eval "$@" ) &>>"$LOG" # use eval here to support env variables before cmd