[misc]: Factorize SetFlagsFromEnvVars and support credentials #4294
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Describe your changes
The code for setting up command flags values from environment variables was copied in three different places, this puts the helper function in the util package so that every component can use it. Furthermore, it now supports reading values from files in
$CREDENTIALS_DIRECTORY
, which allows direct integration with systemd'sLoadCredential
mechanism (but any platform can define such a variable and pass values as files).Note however that it removes support from reading values from variables of the form
WT_...
which is very legacy.Issue ticket number and link
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