78 lines
2.8 KiB
Go
78 lines
2.8 KiB
Go
package function
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/zclconf/go-cty/cty"
|
|
"github.com/zclconf/go-cty/cty/function"
|
|
)
|
|
|
|
// InitTime is the UTC time when this package was initialized. It is
|
|
// used as the timestamp for all configuration templates so that they
|
|
// match for a single build.
|
|
var InitTime time.Time
|
|
|
|
func init() {
|
|
InitTime = time.Now().UTC()
|
|
}
|
|
|
|
// TimestampFunc constructs a function that returns a string representation of the current date and time.
|
|
var TimestampFunc = function.New(&function.Spec{
|
|
Params: []function.Parameter{},
|
|
Type: function.StaticReturnType(cty.String),
|
|
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
|
|
return cty.StringVal(time.Now().UTC().Format(time.RFC3339)), nil
|
|
},
|
|
})
|
|
|
|
// Timestamp returns a string representation of the current date and time.
|
|
//
|
|
// In the HCL language, timestamps are conventionally represented as strings
|
|
// using RFC 3339 "Date and Time format" syntax, and so timestamp returns a
|
|
// string in this format.
|
|
func Timestamp() (cty.Value, error) {
|
|
return TimestampFunc.Call([]cty.Value{})
|
|
}
|
|
|
|
// LegacyIsotimeFunc constructs a function that returns a string representation
|
|
// of the current date and time using golang's datetime formatting.
|
|
var LegacyIsotimeFunc = function.New(&function.Spec{
|
|
Params: []function.Parameter{},
|
|
VarParam: &function.Parameter{
|
|
Name: "format",
|
|
Type: cty.String,
|
|
},
|
|
Type: function.StaticReturnType(cty.String),
|
|
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
|
|
if len(args) > 1 {
|
|
return cty.StringVal(""), fmt.Errorf("too many values, 1 needed: %v", args)
|
|
} else if len(args) == 0 {
|
|
return cty.StringVal(InitTime.Format(time.RFC3339)), nil
|
|
}
|
|
format := args[0].AsString()
|
|
return cty.StringVal(InitTime.Format(format)), nil
|
|
},
|
|
})
|
|
|
|
// LegacyIsotimeFunc returns a string representation of the current date and
|
|
// time using the given format string. The format string follows golang's
|
|
// datetime formatting. See
|
|
// https://www.packer.io/docs/templates/legacy_json_templates/engine#isotime-function-format-reference
|
|
// for more details.
|
|
//
|
|
// This function has been provided to create backwards compatability with
|
|
// Packer's legacy JSON templates. However, we recommend that you upgrade your
|
|
// HCL Packer template to use Timestamp and FormatDate together as soon as is
|
|
// convenient.
|
|
//
|
|
// Please note that if you are using a large number of builders, provisioners
|
|
// or post-processors, the isotime may be slightly different for each one
|
|
// because it is from when the plugin is launched not the initial Packer
|
|
// process. In order to avoid this and make the timestamp consistent across all
|
|
// plugins, set it as a user variable and then access the user variable within
|
|
// your plugins.
|
|
func LegacyIsotime(format cty.Value) (cty.Value, error) {
|
|
return LegacyIsotimeFunc.Call([]cty.Value{format})
|
|
}
|