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Support build args without explicit value #1417

Merged
merged 1 commit into from
Oct 19, 2022
Merged

Support build args without explicit value #1417

merged 1 commit into from
Oct 19, 2022

Commits on Oct 13, 2022

  1. Support build args without explicit value 

    When a build arg key is specified without an explicit value, the
value should be taken from the corresponding environment variable
on the host [1].

When the corresponding environment variable on the host is unset,
the build arg should be ignored [2] to avoid masking a possible default
value specified in the Dockerfile [3]. To pass an empty string as
build arg, use the form "VAR=" on the CLI/as an environment variable.

[1]: https://docs.docker.com/engine/reference/commandline/build/#set-build-time-variables---build-arg
[2]: https://docs.docker.com/engine/reference/commandline/run/#set-environment-variables--e---env---env-file
[3]: moby/moby#24101

Signed-off-by: Caleb Xu <calebcenter@live.com>
    @alebcay
    alebcay committed Oct 13, 2022
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