62 lines
1.6 KiB
Plaintext
62 lines
1.6 KiB
Plaintext
obs-service-docker_label_helper
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===============================
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This service can be enabled to run during buildtime, when it will edit the
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Dockerfile to expand the LABEL instruction.
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A new syntax using entry/exit flags has been introduced to provide
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compatibility with stock docker build command while allowing to add prefixed
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labels based on existing LABEL instructions.
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Both new and old syntax are supported, but you should not mix both in the
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same Dockerfile.
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1 - New syntax using entry/exit flags
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Only LABEL between # labelprefix and # endlabelprefix will be considered
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Example:
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```
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FROM opensuse/tumbleweed
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# labelprefix=org.opensuse.nano
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LABEL org.opencontainers.image.title="Example container"
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LABEL org.opencontainers.image.description="This contains nano"
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# endlabelprefix
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LABEL not.expanded.label="example"
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```
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expands to
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```
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FROM opensuse/tumbleweed
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LABEL org.opensuse.nano.title="Example container"
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LABEL org.opencontainers.image.title="Example container"
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LABEL org.opensuse.nano.description="This contains nano"
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LABEL org.opencontainers.image.description="This contains nano"
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LABEL not.expanded.label="example"
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```
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2 - Old syntax
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Expand the PREFIXEDLABEL instruction.
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Example:
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```
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FROM opensuse/tumbleweed
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# labelprefix=org.opensuse.nano
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PREFIXEDLABEL org.opencontainers.image.title="Example container"
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PREFIXEDLABEL org.opencontainers.image.description="This contains nano"
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```
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expands to
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```
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FROM opensuse/tumbleweed
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LABEL org.opensuse.nano.title="Example container"
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LABEL org.opencontainers.image.title="Example container"
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LABEL org.opensuse.nano.description="This contains nano"
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LABEL org.opencontainers.image.description="This contains nano"
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```
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