entrypoint.sh

#!/usr/bin/env sh

set -e

capture() {
  echo "duration: $2s"
  if [ -z "$2" ]; then
    exit 131 # duration not provided
  fi

  case $1 in
    '')
      pid=$(ps -e -opid= --sort -%cpu | head -n1)
      ;;
    ''|*[!0-9]*)
      pid="$(pgrep $1 || exit 132)" # process not found
      ;;
    *)
      pid="$1"
      ;;
  esac
  echo "pid: $1"

  echo "is it java?"
  exe=$(readlink "/proc/$pid/exe")
  case "$exe" in
    *java*)
      echo "yes"
      cat /proc/$pid/cmdline | grep -qFe '-XX:+PreserveFramePointer' || exit 133
      set +e
      jcmd $pid Compiler.perfmap
      set -e
      if [ $? -ne 0 ]; then
        cp /libperfmap.so /proc/$pid/root
        java -cp /attach-main.jar net.virtualvoid.perf.AttachOnce $pid
        nspid=$(cat proc/$pid/status | grep NSpid | cut -f3)
        cp /proc/$pid/root/tmp/perf-$nspid.map /tmp/perf-$pid.map
      fi
      ;;
    *)
      echo "no"
      ;;
  esac

  echo "capturing..."
  profile --stack-storage-size=65536 -adf -p $pid $2 | tee /out/profile
}

capture "$1" "$2" 1>&2
burn convert --type=folded /out/profile