terraform/states/statemgr/lineage.go

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package statemgr
import (
"fmt"
uuid "github.com/hashicorp/go-uuid"
"github.com/hashicorp/terraform/states/statefile"
"github.com/hashicorp/terraform/version"
)
// NewLineage generates a new lineage identifier string. A lineage identifier
// is an opaque string that is intended to be unique in space and time, chosen
// when state is recorded at a location for the first time and then preserved
// afterwards to allow Terraform to recognize when one state snapshot is a
// predecessor or successor of another.
func NewLineage() string {
lineage, err := uuid.GenerateUUID()
if err != nil {
panic(fmt.Errorf("Failed to generate lineage: %v", err))
}
return lineage
}
// NewStateFile creates a new statefile.File object, with a newly-minted
// lineage identifier and serial 0, and returns a pointer to it.
func NewStateFile() *statefile.File {
return &statefile.File{
Lineage: NewLineage(),
TerraformVersion: version.SemVer,
}
}