Simple bash live reload for Go

entrypoint.sh

#!/bin/bash

SERVER=/go/bin/api

# create directory for Delve logs, we use it to know that Delve
# debugger is running
mkdir -p /tmp/dlv_log

runServer() {
  echo Running server

  # create directory and file to

  touch /tmp/dlv_log/output.log

  # run server with debug
  dlv --headless=true --continue --listen=:2345 --accept-multiclient --api-version=2 exec \
   "$SERVER" | tee -a /tmp/dlv_log/output.log &

  until serverPid=$(pidof $SERVER)
  do
      sleep 1
  done

  pidof dlv > /tmp/dlv.pid
  echo "$serverPid" > /tmp/server.pid
  echo Delve PID: "$(pidof dlv)", Server PID: "$serverPid"
}

killRunningServer() {
  if [ -f /tmp/dlv.pid ]
  then
    echo killing old Delve, PID: "$(cat /tmp/dlv.pid)"
    # we can't "wait" the process because it's not a child
    kill "$(cat /tmp/dlv.pid)"
    while [ -e /proc/"$(cat /tmp/dlv.pid)" ]; do sleep .5; done
    rm -f /tmp/dlv.pid
  fi

  if [ -f /tmp/server.pid ]
  then
    echo killing old server, PID: "$(cat /tmp/server.pid)"
    kill "$(cat /tmp/server.pid)"
    while [ -e /proc/"$(cat /tmp/server.pid)" ]; do sleep .5; done
    rm -f /tmp/server.pid
  fi
}

buildServer() {
  echo Building...
  go install -gcflags="all=-N -l" ./...
}

rerunServer () {
  buildServer
  killRunningServer
  runServer
}

lockBuild() {
  # waiting for the file to delete
  while [ -f /tmp/server.lock ]
  do
    sleep 1
  done

  touch /tmp/server.lock
}

unlockBuild() {
  # remove lock file
  rm -f /tmp/server.lock
}

# run the server for the first time
buildServer
runServer

inotifywait -e create,delete,modify -r -m --format "%f" ./ | while read -r file
do
  lockBuild
    if [[ $file == *.go ]]; then
      echo File changed: "$file"
      rerunServer
    fi
  unlockBuild
done