What is image2df

image2df is a tool for Generate Dockerfile by an image.

This tool is very useful when you only have an image and need to generate a Dockerfile with it.

How does it work

Parsing by the history information of an image.

Quick reference

• Maintained by: cucker0 github⁠

Supported tags and respective Dockerfile links

• 1.4, 1, latest, 1.4-python:3.11.3-docker6.1.2⁠
• 1.3, 1.3-python:3.9.6-docker5.0⁠
• 1.2, 1.2-python:3.9.6-alpine3.14⁠

Change logs

• 1.4
  • Fix EXPOSE instruct fotmat. EXPOSE instruct format have changed in new version docker API(docker 23.0.5), such as EXPOSE map[3306/tcp:{} 53/tcp:{} ...], but Dockerfile don't support this format.
  • Fix VOLUME instruct fotmat. Such as VOLUME [/var/lib/mysql] change to VOLUME ["/var/lib/mysql"].
• 1.3
  Fix this case, when there are more than 2 parameters on ENTRYPOINT or CMD instruction, there is no comma between the parameters.

Deficiencies

The "FROM <basc_image>" maybe is not accurate.

There is a way to get an accurate basc_image info, you should build a Library for mapping images tag to files sha256 value, a file sha256 value likes ADD file:f278386b0cef68136129f5f58c52445590a417b624d62bca158d4dc926c340df in / .

How to use this image

# Command alias
echo "alias image2df='docker run --rm --privileged -v /var/run/docker.sock:/var/run/docker.sock cucker/image2df'" >> ~/.bashrc
. ~/.bashrc

# Excute command
image2df <IMAGE>

• See help

  docker run --rm cucker/image2df --help
  
  # or
  docker run --rm cucker/image2df
  

  Copy

• For example

  $ echo "alias image2df='docker run --rm --privileged -v /var/run/docker.sock:/var/run/docker.sock cucker/image2df'" >> ~/.bashrc
  $ . ~/.bashrc
  $ docker pull mysql
  $ image2df mysql
  
  # ========== Dockerfile ==========
  FROM mysql:latest
  ADD file:61a2085af5116916e7b117c2e7ad7116bdc0282d8fa9ce76191c4101f5e866ff in /
  CMD ["/bin/bash"]
  RUN set -eux; \
      groupadd --system --gid 999 mysql; \
      useradd --system --uid 999 --gid 999 --home-dir /var/lib/mysql --no-create-home mysql
  ENV GOSU_VERSION=1.16
  RUN set -eux; \
      arch="$(uname -m)"; \
      case "$arch" in \
          aarch64) gosuArch='arm64' ;; \
      x86_64) gosuArch='amd64' ;; \
      *) echo >&2 "error: unsupported architecture: '$arch'"; exit 1 ;; \
      esac; \
      curl -fL -o /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$gosuArch.asc"; \
      curl -fL -o /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$gosuArch"; \
      export GNUPGHOME="$(mktemp -d)"; \
      gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
      gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
      rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
      chmod +x /usr/local/bin/gosu; \
      gosu --version; \
      gosu nobody true
  RUN set -eux; \
      microdnf install -y \
          bzip2 \
          gzip \
          openssl \
          xz \
          zstd \
          findutils \
      ; \
      microdnf clean all
  RUN set -eux; \
      key='859BE8D7C586F538430B19C2467B942D3A79BD29'; \
      export GNUPGHOME="$(mktemp -d)"; \
      gpg --batch --keyserver keyserver.ubuntu.com --recv-keys "$key"; \
      gpg --batch --export --armor "$key" > /etc/pki/rpm-gpg/RPM-GPG-KEY-mysql; \
      rm -rf "$GNUPGHOME"
  ENV MYSQL_MAJOR=8.0
  ENV MYSQL_VERSION=8.0.33-1.el8
  RUN set -eu; \
      . /etc/os-release; \
      { \
          echo '[mysql8.0-server-minimal]'; \
      echo 'name=MySQL 8.0 Server Minimal'; \
      echo 'enabled=1'; \
      echo "baseurl=https://repo.mysql.com/yum/mysql-8.0-community/docker/el/${VERSION_ID%%[.-]*}/\$basearch/"; \
      echo 'gpgcheck=1'; \
      echo 'gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql'; \
      echo 'module_hotfixes=true'; \
      } | tee /etc/yum.repos.d/mysql-community-minimal.repo
  RUN set -eux; \
      microdnf install -y "mysql-community-server-minimal-$MYSQL_VERSION"; \
      microdnf clean all; \
      grep -F 'socket=/var/lib/mysql/mysql.sock' /etc/my.cnf; \
      sed -i 's!^socket=.*!socket=/var/run/mysqld/mysqld.sock!' /etc/my.cnf; \
      grep -F 'socket=/var/run/mysqld/mysqld.sock' /etc/my.cnf; \
      { echo '[client]'; echo 'socket=/var/run/mysqld/mysqld.sock'; } >> /etc/my.cnf; \
      ! grep -F '!includedir' /etc/my.cnf; \
      { echo; echo '!includedir /etc/mysql/conf.d/'; } >> /etc/my.cnf; \
      mkdir -p /etc/mysql/conf.d; \
      mkdir -p /var/lib/mysql /var/run/mysqld; \
      chown mysql:mysql /var/lib/mysql /var/run/mysqld; \
      chmod 1777 /var/lib/mysql /var/run/mysqld; \
      mkdir /docker-entrypoint-initdb.d; \
      mysqld --version; \
      mysql --version
  RUN set -eu; \
      . /etc/os-release; \
      { \
          echo '[mysql-tools-community]'; \
      echo 'name=MySQL Tools Community'; \
      echo "baseurl=https://repo.mysql.com/yum/mysql-tools-community/el/${VERSION_ID%%[.-]*}/\$basearch/"; \
      echo 'enabled=1'; \
      echo 'gpgcheck=1'; \
      echo 'gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql'; \
      echo 'module_hotfixes=true'; \
      } | tee /etc/yum.repos.d/mysql-community-tools.repo
  ENV MYSQL_SHELL_VERSION=8.0.33-1.el8
  RUN set -eux; \
      microdnf install -y "mysql-shell-$MYSQL_SHELL_VERSION"; \
      microdnf clean all; \
      mysqlsh --version
  VOLUME ["/var/lib/mysql"]
  COPY file:e9c22353a1133b89c5bca24ecacd348acd094e50e5e5c45375a997c6b1f07192 in /usr/local/bin/
  RUN ln -s usr/local/bin/docker-entrypoint.sh /entrypoint.sh # backwards compat
  ENTRYPOINT ["docker-entrypoint.sh"]
  EXPOSE 3306 33060
  CMD ["mysqld"]
  

  Copy