78 lines
1.8 KiB
Go
78 lines
1.8 KiB
Go
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package packer
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import (
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"fmt"
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"os"
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"github.com/hashicorp/go-multierror"
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"github.com/mitchellh/packer/template"
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)
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// Core is the main executor of Packer. If Packer is being used as a
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// library, this is the struct you'll want to instantiate to get anything done.
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type Core struct {
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cache Cache
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components ComponentFinder
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ui Ui
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template *template.Template
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variables map[string]string
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}
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// CoreConfig is the structure for initializing a new Core. Once a CoreConfig
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// is used to initialize a Core, it shouldn't be re-used or modified again.
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type CoreConfig struct {
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Cache Cache
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Components ComponentFinder
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Ui Ui
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Template *template.Template
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Variables map[string]string
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}
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// NewCore creates a new Core.
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func NewCore(c *CoreConfig) (*Core, error) {
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if c.Ui == nil {
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c.Ui = &BasicUi{
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Reader: os.Stdin,
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Writer: os.Stdout,
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ErrorWriter: os.Stdout,
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}
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}
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return &Core{
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cache: c.Cache,
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components: c.Components,
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ui: c.Ui,
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template: c.Template,
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variables: c.Variables,
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}, nil
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}
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// Validate does a full validation of the template.
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//
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// This will automatically call template.Validate() in addition to doing
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// richer semantic checks around variables and so on.
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func (c *Core) Validate() error {
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// First validate the template in general, we can't do anything else
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// unless the template itself is valid.
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if err := c.template.Validate(); err != nil {
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return err
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}
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// Validate variables are set
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var err error
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for n, v := range c.template.Variables {
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if v.Required {
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if _, ok := c.variables[n]; !ok {
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err = multierror.Append(err, fmt.Errorf(
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"required variable not set: %s", n))
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}
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}
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}
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// TODO: validate all builders exist
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// TODO: ^^ provisioner
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// TODO: ^^ post-processor
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return err
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}
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