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website: Use a normal file-based template in example, and expand the explanation of $${thing}

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Nick Fagerlund 2019-03-21 13:56:43 -07:00 committed by Nick Fagerlund
parent db6ec472ef
commit b61e50be13
1 changed files with 19 additions and 8 deletions
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27
website/docs/configuration-0-11/interpolation.html.md
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@ -184,7 +184,7 @@ The supported built-in functions are:
**This is not equivalent** of `base64encode(sha512(string))`
since `sha512()` returns hexadecimal representation.
* `bcrypt(password, cost)` - Returns the Blowfish encrypted hash of the string
* `bcrypt(password, cost)` - Returns the Blowfish encrypted hash of the string
at the given cost. A default `cost` of 10 will be used if not provided.
* `ceil(float)` - Returns the least integer value greater than or equal
@ -411,9 +411,9 @@ The supported built-in functions are:
invocation of the function, so in order to prevent diffs on every plan & apply, it must be used with the
[`ignore_changes`](./resources.html#ignore-changes) lifecycle attribute.
* `timeadd(time, duration)` - Returns a UTC timestamp string corresponding to adding a given `duration` to `time` in RFC 3339 format.
For example, `timeadd("2017-11-22T00:00:00Z", "10m")` produces a value `"2017-11-22T00:10:00Z"`.
* `timeadd(time, duration)` - Returns a UTC timestamp string corresponding to adding a given `duration` to `time` in RFC 3339 format.
For example, `timeadd("2017-11-22T00:00:00Z", "10m")` produces a value `"2017-11-22T00:10:00Z"`.
* `title(string)` - Returns a copy of the string with the first characters of all the words capitalized.
* `transpose(map)` - Swaps the keys and list values in a map of lists of strings. For example, transpose(map("a", list("1", "2"), "b", list("2", "3")) produces a value equivalent to map("1", list("a"), "2", list("a", "b"), "3", list("b")).
@ -451,14 +451,20 @@ Terraform 0.12 and later.
Long strings can be managed using templates.
[Templates](/docs/providers/template/index.html) are
[data-sources](./data-sources.html) defined by a
filename and some variables to use during interpolation. They have a
computed `rendered` attribute containing the result.
string with interpolation tokens (usually loaded from a file) and some variables
to use during interpolation. They have a computed `rendered` attribute
containing the result.
A template data source looks like:
```hcl
# templates/greeting.tpl
${hello} ${world}!
```
```hcl
data "template_file" "example" {
template = "$${hello} $${world}!"
template = "${file("templates/greeting.tpl")}"
vars {
hello = "goodnight"
world = "moon"
@ -472,7 +478,12 @@ output "rendered" {
Then the rendered value would be `goodnight moon!`.
Note that the double dollar signs (`$$`) are needed in inline templates. Otherwise Terraform will return an error.
-> **Note:** If you specify the template as a literal string instead of loading
a file, the inline template must use double dollar signs (like `$${hello}`) to
prevent Terraform from interpolating values from the configuration into the
string. This is because `template_file` creates its own instance of the
interpolation system, with values provided by its nested `vars` block instead of
by the surrounding scope of the configuration.
You may use any of the built-in functions in your template. For more
details on template usage, please see the