Resources

Resources describe the desired state of your infrastructure. Each resource represents something to manage and is backed by a provider that implements platform-specific management logic.

Every resource has a type, a unique name, and resource-specific properties.

Resource types

Apply: Compose manifests from smaller reusable manifests
Archive: Download, extract and copy files from tar.gz and zip archives
Exec: Execute commands idempotently
File: Manage files content, ownership and more
Package: Install, upgrade, downgrade and remove packages using OS native packagers
Scaffold: Render template directories into target directories with synchronization and purge support
Service: Enable, disable, start, stop and restart services using OS native service managers

Common properties

All resources support the following common properties:

Property	Description
`name`	Unique identifier for the resource
`ensure`	Desired state (values vary by resource type)
`alias`	Alternative name for use in `subscribe`, `require`, and logging
`provider`	Force a specific provider
`require`	List of resources (`type#name` or `type#alias`) that must succeed first
`health_checks`	Health checks to run after applying (see Monitoring)
`control`	Conditional execution rules (see below)

Conditional resource execution

Resources can be conditionally executed using a control section and expressions that should resolve to boolean values.

package:
  name: zsh
  ensure: 5.9
  control:
    if: lookup("facts.host.info.os") == "linux"
    unless: lookup("facts.host.info.virtualizationSystem") == "docker"

ccm ensure package zsh 5.9 \
    --if "lookup('facts.host.info.os') == 'linux'"
    --unless "lookup('facts.host.info.virtualizationSystem') == 'docker'"

{
  "protocol": "io.choria.ccm.v1.resource.ensure.request",
  "type": "package",
  "properties": {
    "name": "zsh",
    "ensure": "5.9",
    "control": {
      "if": "lookup(\"facts.host.info.os\") == \"linux\"",
      "unless": "lookup(\"facts.host.info.virtualizationSystem\") == \"docker\""
    }
  }
}

This installs zsh on all linux machines unless they are running inside a docker container.

The following table shows how the two conditions interact:

`if`	`unless`	Resource Managed?
(not set)	(not set)	Yes
`true`	(not set)	Yes
`false`	(not set)	No
(not set)	`true`	No
(not set)	`false`	Yes
`true`	`true`	No
`true`	`false`	Yes
`false`	`true`	No
`false`	`false`	No