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Merge branch 'master' of https://github.com/mitchellh/packer

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Chris Bednarski 2016-02-26 10:47:34 -08:00
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CHANGELOG.md
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@ -14,6 +14,8 @@ IMPROVEMENTS:
BUG FIXES:
* builders/parallels: Handle `output_directory` containing . and ..
[GH-3239]
## 0.9.0 (February 19, 2016)

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website/source/docs/templates/user-variables.html.markdown vendored
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@ -1,7 +1,7 @@
---
description: |
User variables allow your templates to be further configured with variables from
the command-line, environmental variables, or files. This lets you parameterize
the command-line, environment variables, or files. This lets you parameterize
your templates so that you can keep secret tokens, environment-specific data,
and other types of information out of your templates. This maximizes the
portability and shareability of the template.
@ -12,7 +12,7 @@ page_title: User Variables in Templates
# User Variables
User variables allow your templates to be further configured with variables from
the command-line, environmental variables, or files. This lets you parameterize
the command-line, environment variables, or files. This lets you parameterize
your templates so that you can keep secret tokens, environment-specific data,
and other types of information out of your templates. This maximizes the
portability and shareability of the template.
@ -62,11 +62,11 @@ function in the form of <code>{{user \`variable\`}}</code>. This function can be
used in *any value* within the template, in builders, provisioners, *anything*.
The user variable is available globally within the template.
## Environmental Variables
## Environment Variables
Environmental variables can be used within your template using user variables.
Environment variables can be used within your template using user variables.
The `env` function is available *only* within the default value of a user
variable, allowing you to default a user variable to an environmental variable.
variable, allowing you to default a user variable to an environment variable.
An example is shown below:
``` {.javascript}
@ -79,13 +79,13 @@ An example is shown below:
}
```
This will default "my\_secret" to be the value of the "MY\_SECRET" environmental
This will default "my\_secret" to be the value of the "MY\_SECRET" environment
variable (or the empty string if it does not exist).
-&gt; **Why can't I use environmental variables elsewhere?** User variables are
-&gt; **Why can't I use environment variables elsewhere?** User variables are
the single source of configurable input to a template. We felt that having
environmental variables used *anywhere* in a template would confuse the user
about the possible inputs to a template. By allowing environmental variables
environment variables used *anywhere* in a template would confuse the user
about the possible inputs to a template. By allowing environment variables
only within default values for user variables, user variables remain as the
single source of input to a template that a user can easily discover using
`packer inspect`.