terraform/command/flag_var.go

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package command
import (
"fmt"
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"io/ioutil"
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"strings"
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"github.com/hashicorp/hcl"
"github.com/mitchellh/go-homedir"
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)
// FlagVar is a flag.Value implementation for parsing user variables
// from the command-line in the format of '-var key=value'.
type FlagVar map[string]string
func (v *FlagVar) String() string {
return ""
}
func (v *FlagVar) Set(raw string) error {
idx := strings.Index(raw, "=")
if idx == -1 {
return fmt.Errorf("No '=' value in arg: %s", raw)
}
if *v == nil {
*v = make(map[string]string)
}
key, value := raw[0:idx], raw[idx+1:]
(*v)[key] = value
return nil
}
// FlagVarFile is a flag.Value implementation for parsing user variables
// from the command line in the form of files. i.e. '-var-file=foo'
type FlagVarFile map[string]string
func (v *FlagVarFile) String() string {
return ""
}
func (v *FlagVarFile) Set(raw string) error {
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vs, err := loadVarFile(raw)
if err != nil {
return err
}
if *v == nil {
*v = make(map[string]string)
}
for key, value := range vs {
(*v)[key] = value
}
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return nil
}
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func loadVarFile(rawPath string) (map[string]string, error) {
path, err := homedir.Expand(rawPath)
if err != nil {
return nil, fmt.Errorf(
"Error expanding path: %s", err)
}
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// Read the HCL file and prepare for parsing
d, err := ioutil.ReadFile(path)
if err != nil {
return nil, fmt.Errorf(
"Error reading %s: %s", path, err)
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}
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// Parse it
obj, err := hcl.Parse(string(d))
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if err != nil {
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return nil, fmt.Errorf(
"Error parsing %s: %s", path, err)
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}
var result map[string]string
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if err := hcl.DecodeObject(&result, obj); err != nil {
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return nil, err
}
return result, nil
}