Find a PID running container name

find-container-by-pid.sh

#!/bin/bash

set -e

error() {
  echo "Error: $1"
  exit 1
}
trap 'error "An unexpected error occurred. Exiting."' ERR

if [ -z "$1" ]; then
  echo "Usage: $0 <pid>"
  exit 1
fi

CGROUP_PATH=/proc/$1/cgroup
if [ ! -f $CGROUP_PATH ]; then
  echo "Process $1 not found"
  exit 1
fi
if [ ! -r $CGROUP_PATH ]; then
  echo "Permission denied to read $CGROUP_PATH"
  exit 1
fi

CONTAINER_ID=$(cat $CGROUP_PATH | grep -o -E '[0-9a-f]{64}' | head -n 1)
if [ -z "$CONTAINER_ID" ]; then
  echo "Process $1 is not in a container"
  exit 1
fi

CONTAINER_NAME=$(docker inspect --format '{{.Name}}' $CONTAINER_ID | sed 's/^\///')

echo "$CONTAINER_ID: $CONTAINER_NAME"