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run,create: add support for --env-merge for preprocessing vars
Allow end users to preprocess default environment variables before injecting them into container using `--env-merge` Usage ``` podman run -it --rm --env-merge some=${some}-edit --env-merge some2=${some2}-edit2 myimage sh ``` Closes: containers#15288 Signed-off-by: Aditya R <arajan@redhat.com>
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Original file line number | Diff line number | Diff line change |
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#### **--env-merge**=*env* | ||
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Preprocess default environment variables for the containers. For example | ||
if image contains environment variable `hello=world` user can preprocess | ||
it using `--env-merge hello=${hello}-some` so new value will be `hello=world-some`. |
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