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Detect Docker robustly #3

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Detect Docker robustly #3

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Commits on Sep 12, 2023

  1. Detect Docker robustly 

    "&> /dev/null" works as a redirection from stdout/stderr to /dev/null
in Bash but not in POSIX shell (considered as an asynchronous execution
and the result of the "command" command cannot be retrieved).

As a result, it always assumes that Docker always exists.

This commit makes the redirection robust and portable (makes it possible
to detect "no Docker" condition correctly).

Signed-off-by: Tsukasa OI <[email protected]>
    @a4lg
    a4lg committed Sep 12, 2023
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