#!/bin/bash
# every claim in the post comes from this output
set -u
cd "$(dirname "$0")"
IMG=python:3.13-slim
docker pull -q $IMG >/dev/null
echo "== docker $(docker version --format '{{.Server.Version}}')"

echo "== 1. one process, two PIDs"
c=$(docker run -d $IMG python -c "import time; time.sleep(600)")
echo "host PID:      $(docker inspect -f '{{.State.Pid}}' $c)"
echo "container PID 1 cmdline: $(docker exec $c cat /proc/1/cmdline | tr '\0' ' ')"
echo "cgroup: $(docker exec $c cat /proc/1/cgroup)"
docker rm -f $c >/dev/null

echo "== 2. docker stop"
stop() {  # name, docker run args...
  local n=$1; shift
  c=$(docker run -d -v "$PWD/sig:/w" "$@")
  sleep 1.5
  p1=$(docker exec $c cat /proc/1/cmdline | tr '\0' ' ')
  s=$(date +%s.%N 2>/dev/null || python3 -c 'import time;print(time.time())')
  s=$(python3 -c 'import time;print(time.time())')
  docker stop -t 10 $c >/dev/null
  e=$(python3 -c 'import time;print(time.time())')
  printf '%-34s PID1=[%s] stop=%.1fs exit=%s\n' "$n" "$p1" "$(python3 -c "print($e-$s)")" "$(docker inspect -f '{{.State.ExitCode}}' $c)"
  docker rm $c >/dev/null
}
stop "script, no exec"          $IMG sh /w/start.sh
stop "sh -c (shell form)"       $IMG sh -c "python /w/app.py"
stop "sh -c with two commands"  $IMG sh -c "echo hi; python /w/app.py"
stop "exec form, no handler"    $IMG python /w/app.py
stop "exec form + handler"      -e HANDLE=1 $IMG python /w/app.py
stop "--init, no handler"       --init $IMG python /w/app.py

# section 3 (build cache) lives in cache.sh: it needs a change BuildKit has never seen

echo "== 4. memory limit"
c=$(docker run -d --memory 128m --memory-swap 128m $IMG python -c "
a=[]
while True:
    a.append(bytearray(10_000_000)); print(len(a)*10, 'MB', flush=True)")
docker wait $c >/dev/null
echo "exit=$(docker inspect -f '{{.State.ExitCode}}' $c) oom=$(docker inspect -f '{{.State.OOMKilled}}' $c)"
echo "last log lines:"; docker logs $c 2>&1 | tail -3 | sed 's/^/   /'
docker rm $c >/dev/null