terraform/command/state_push.go

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2017-01-19 05:50:45 +01:00
package command
import (
"fmt"
"os"
"strings"
"github.com/hashicorp/terraform/terraform"
"github.com/mitchellh/cli"
)
// StatePushCommand is a Command implementation that shows a single resource.
type StatePushCommand struct {
Meta
StateMeta
}
func (c *StatePushCommand) Run(args []string) int {
args = c.Meta.process(args, true)
var flagForce bool
cmdFlags := c.Meta.flagSet("state push")
cmdFlags.BoolVar(&flagForce, "force", false, "")
if err := cmdFlags.Parse(args); err != nil {
return cli.RunResultHelp
}
args = cmdFlags.Args()
if len(args) != 1 {
c.Ui.Error("Exactly one argument expected: path to state to push")
return 1
}
// Read the state
f, err := os.Open(args[0])
if err != nil {
c.Ui.Error(err.Error())
return 1
}
sourceState, err := terraform.ReadState(f)
f.Close()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error reading source state %q: %s", args[0], err))
return 1
}
// Load the backend
b, err := c.Backend(nil)
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to load backend: %s", err))
return 1
}
// Get the state
state, err := b.State()
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to load destination state: %s", err))
return 1
}
if err := state.RefreshState(); err != nil {
c.Ui.Error(fmt.Sprintf("Failed to load destination state: %s", err))
return 1
}
dstState := state.State()
// If we're not forcing, then perform safety checks
if !flagForce && !dstState.Empty() {
if !dstState.SameLineage(sourceState) {
c.Ui.Error(strings.TrimSpace(errStatePushLineage))
return 1
}
age, err := dstState.CompareAges(sourceState)
if err != nil {
c.Ui.Error(err.Error())
return 1
}
if age == terraform.StateAgeReceiverNewer {
c.Ui.Error(strings.TrimSpace(errStatePushSerialNewer))
return 1
}
}
// Overwrite it
if err := state.WriteState(sourceState); err != nil {
c.Ui.Error(fmt.Sprintf("Failed to write state: %s", err))
return 1
}
if err := state.PersistState(); err != nil {
c.Ui.Error(fmt.Sprintf("Failed to write state: %s", err))
return 1
}
return 0
}
func (c *StatePushCommand) Help() string {
helpText := `
Usage: terraform state push [options] PATH
Update remote state from a local state file at PATH.
This command "pushes" a local state and overwrites remote state
with a local state file. The command will protect you against writing
an older serial or a different state file lineage unless you specify the
"-force" flag.
This command works with local state (it will overwrite the local
state), but is less useful for this use case.
Options:
-force Write the state even if lineages don't match or the
remote serial is higher.
`
return strings.TrimSpace(helpText)
}
func (c *StatePushCommand) Synopsis() string {
return "Update remote state from a local state file"
}
const errStatePushLineage = `
The lineages do not match! The state will not be pushed.
The "lineage" is a unique identifier given to a state on creation. It helps
protect Terraform from overwriting a seemingly unrelated state file since it
represents potentially losing real state.
Please verify you're pushing the correct state. If you're sure you are, you
can force the behavior with the "-force" flag.
`
const errStatePushSerialNewer = `
The destination state has a higher serial number! The state will not be pushed.
A higher serial could indicate that there is data in the destination state
that was not present when the source state was created. As a protection measure,
Terraform will not automatically overwrite this state.
Please verify you're pushing the correct state. If you're sure you are, you
can force the behavior with the "-force" flag.
`