[bug #60807] envsubst: support an --in-place mode

[Andrew Stribblehill]

URL:
  <https://savannah.gnu.org/bugs/?60807>

                 Summary: envsubst: support an --in-place mode
                 Project: GNU gettext
            Submitted by: stribb
            Submitted on: Mon 21 Jun 2021 01:09:14 PM UTC
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

Quite a few people in the production arena are using envsubst to
interpolate their files as part of their continuous integration / continuous
deployment (CI/CD) pipelines.

At present, the workflow is typically:

  T=$(mktemp)
  envsubst < template_file > $T
  mv $T template_file

or, for those of us lucky enough to have Sponge installed:

  envsubst < template_file | sponge template_file

If envsubst supported in-place editing, this would be simply:

  envsubst -i template_file





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