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31 lines
1.3 KiB
Markdown
31 lines
1.3 KiB
Markdown
####> This option file is used in:
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####> podman build, farm build
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####> If file is edited, make sure the changes
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####> are applicable to all of those.
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#### **--build-context**=*name=value*
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Specify an additional build context using its short name and its location.
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Additional build contexts can be referenced in the same manner as we access
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different stages in COPY instruction.
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Valid values are:
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* Local directory – e.g. --build-context project2=../path/to/project2/src (This option is not available with the remote Podman client. On Podman machine setup (i.e macOS and Windows) path must exists on the machine VM)
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* HTTP URL to a tarball – e.g. --build-context src=https://example.org/releases/src.tar
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* Container image – specified with a container-image:// prefix, e.g. --build-context alpine=container-image://alpine:3.15, (also accepts docker://, docker-image://)
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On the Containerfile side, reference the build context on all
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commands that accept the “from” parameter. Here’s how that might look:
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```dockerfile
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FROM [name]
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COPY --from=[name] ...
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RUN --mount=from=[name] …
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```
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The value of [name] is matched with the following priority order:
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* Named build context defined with --build-context [name]=..
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* Stage defined with AS [name] inside Containerfile
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* Image [name], either local or in a remote registry
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