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fix: fix another incorrect substitution doc #612

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merged 1 commit into from
Apr 16, 2024
Merged

fix: fix another incorrect substitution doc #612

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12 changes: 7 additions & 5 deletions doc/stacker_yaml.md
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Original file line number Diff line number Diff line change
@@ -1,15 +1,17 @@
## The `stacker.yaml` file

When doing a `stacker build`, the behavior of stacker is specified by the yaml
directives below. In addition to these, stacker allows variable substitions of
several forms. For example, a line like:
directives below.

$ONE ${{TWO}} ${{THREE:3}}
Before the yaml is parsed, stacker performs substitution on placeholders in the
file of the format `${{VAR}}` or `${{VAR:default}}`. For example, a line like:

When run with `stacker build --substitute ONE=1 --substitute TWO=2` is
${{ONE}} ${{TWO:3}}

When run with `stacker build --substitute ONE=1` is
processed in stacker as:

1 2 3
1 3

In order to avoid conflict with bash or POSIX shells in the `run` section,
only placeholders with two braces are supported, e.g. `${{FOO}}`.
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