Basic template based Dockerfile approach
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---
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- name: Set default modified_append_tag
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set_fact:
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modified_append_tag: "{{ lookup('pipe','date +-modified-%Y%m%d%H%M%S') }}"
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when: modified_append_tag is undefined or modified_append_tag == None
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- name: Create image build context directory
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tempfile:
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state: directory
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prefix: tripleo-modify-image
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register: context_dir
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- name: Write Dockerfile to {{ context_dir.path }}
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template:
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src: Dockerfile.j2
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dest: "{{ context_dir.path }}/Dockerfile"
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- name: Modify image
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docker_image:
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name: "{{ modified_image }}{{ modified_append_tag }}"
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path: "{{ context_dir.path }}"
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2
templates/Dockerfile.j2
Normal file
2
templates/Dockerfile.j2
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FROM {{ source_image }}
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LABEL modified_append_tag={{ modified_append_tag }}
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# Mandatory fully qualified reference to the source image to be modified
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source_image:
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# Mandatory path to the directory containing the Dockerfile to modify the image
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modify_dir_path:
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# String to be appended after the tag to indicate this is a modified version of
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# the source image.
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modified_append_tag: "-modified-{{lookup('pipe','date +%Y%m%d%H%M%S')}}"
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# the source image. Defaults to the output of the command
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# "date +-modified-%Y%m%d%H%M%S"
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modified_append_tag:
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# If set, the modified image will be tagged with this reference. If the purpose
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# of the image is not changing, it may be enough to rely on modified_append_tag
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# to identify that this is a modified version of the source image.
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# modified_append_tag will still be appended to this reference.
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modified_image:
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# Build-time variables for the image build. The role variables source_image and
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# modified_append_tag will be merged with this dict.
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modify_buildargs: {}
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modified_image: {{ source_image }}
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