# การแสดงประวัติการสร้าง Docker image ด้วยคำสั่ง docker history

image2dockerfile.sh

#!/bin/bash
# MrChoke
# Ref: https://docs.docker.com/engine/reference/commandline/history/
# Ref: https://stackoverflow.com/questions/19104847/how-to-generate-a-dockerfile-from-an-image

if [ $# -eq 0 ]; then
    echo "No docker image provided."
    echo -e "Example:\n"
    echo -e "$0 nginx:latest\n"
    exit 1
fi

docker history  \
  --no-trunc \
  --format "{{.CreatedBy}}" \
  $1 \
  | tac \
  | awk '
    {
      gsub(/^\/bin\/sh \-c #\(nop\) /,"");
      gsub(/^\/bin\/sh \-c /,"RUN ");
      gsub(/\/bin\/sh \-c /,"");
      gsub(/^[ \t]+|[ \t]+$/,"");
      gsub(/ && /,"\\\n & ")
    }1'