[bug #64666] envsubst: passing variables in SHELL-FORMAT without dollar

[Karl Bartel]

URL:
  <https://savannah.gnu.org/bugs/?64666>

                 Summary: envsubst: passing variables in  SHELL-FORMAT without
dollar
                   Group: GNU gettext
               Submitter: karlb
               Submitted: Thu 14 Sep 2023 12:34:56 PM UTC
                Category: End-user / runtime
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any


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Follow-up Comments:


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Date: Thu 14 Sep 2023 12:34:56 PM UTC By: Karl Bartel <karlb>
When using envsubst with a restricted set of variables, the SHELL-FORMAT
parameter has to be given as a comma separated list of dollar prefixed
variables.

Allowing variable names without the dollar prefix would prevent the common
mistake of not escaping the dollar when calling envsubst from the shell
without introducing any ambiguity. It would also make typing and reading the
list slightly more pleasant.

Are there any reasons against allowing this? Would a corresponding patch get
accepted?

Just for context: This change (along with renaming SHELL-FORMAT and passing
variables as separate args) has been suggested in
https://ariadne.space/2021/04/15/a-tale-of-two-envsubst-implementations/
(section "Defining a restricted set of environment variables is bizzare").







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