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 <research_trasio@irq.a4lg.com>

   

   a4lg committed Sep 12, 2023
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