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Use absolute WORKDIR.
Superseded by buildkit/WorkdirRelativePath, which provides the same check with improved diagnostics.

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Description

Using a relative WORKDIR without first setting an absolute path can lead to unexpected results if the base image changes its working directory.

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Examples

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Problematic code

FROM nginx
WORKDIR usr/share/nginx/html

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Correct code

FROM nginx
WORKDIR /usr/share/nginx/html

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Reference