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volume_deregister.go
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volume_deregister.go
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package command
import (
"fmt"
"strings"
"github.com/hashicorp/nomad/api/contexts"
"github.com/posener/complete"
)
type VolumeDeregisterCommand struct {
Meta
}
func (c *VolumeDeregisterCommand) Help() string {
helpText := `
Usage: nomad volume deregister [options] <id>
Remove an unused volume from Nomad.
General Options:
` + generalOptionsUsage() + `
Volume Deregister Options:
-force
Force deregistration of the volume and immediately drop claims for
terminal allocations. Returns an error if the volume has running
allocations. This does not detach the volume from client nodes.
`
return strings.TrimSpace(helpText)
}
func (c *VolumeDeregisterCommand) AutocompleteFlags() complete.Flags {
return mergeAutocompleteFlags(c.Meta.AutocompleteFlags(FlagSetClient),
complete.Flags{
"-force": complete.PredictNothing,
})
}
func (c *VolumeDeregisterCommand) AutocompleteArgs() complete.Predictor {
return complete.PredictFunc(func(a complete.Args) []string {
client, err := c.Meta.Client()
if err != nil {
return nil
}
// When multiple volume types are implemented, this search should merge contexts
resp, _, err := client.Search().PrefixSearch(a.Last, contexts.Volumes, nil)
if err != nil {
return []string{}
}
return resp.Matches[contexts.Volumes]
})
}
func (c *VolumeDeregisterCommand) Synopsis() string {
return "Remove a volume"
}
func (c *VolumeDeregisterCommand) Name() string { return "volume deregister" }
func (c *VolumeDeregisterCommand) Run(args []string) int {
var force bool
flags := c.Meta.FlagSet(c.Name(), FlagSetClient)
flags.Usage = func() { c.Ui.Output(c.Help()) }
flags.BoolVar(&force, "force", false, "Force deregister and drop claims")
if err := flags.Parse(args); err != nil {
c.Ui.Error(fmt.Sprintf("Error parsing arguments %s", err))
return 1
}
// Check that we get exactly one argument
args = flags.Args()
if l := len(args); l != 1 {
c.Ui.Error("This command takes one argument: <id>")
c.Ui.Error(commandErrorText(c))
return 1
}
volID := args[0]
// Get the HTTP client
client, err := c.Meta.Client()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
return 1
}
// Confirm the -force flag
if force {
question := fmt.Sprintf("Are you sure you want to force deregister volume %q? [y/N]", volID)
answer, err := c.Ui.Ask(question)
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to parse answer: %v", err))
return 1
}
if answer == "" || strings.ToLower(answer)[0] == 'n' {
// No case
c.Ui.Output("Cancelling volume deregister")
return 0
} else if strings.ToLower(answer)[0] == 'y' && len(answer) > 1 {
// Non exact match yes
c.Ui.Output("For confirmation, an exact ‘y’ is required.")
return 0
} else if answer != "y" {
c.Ui.Output("No confirmation detected. For confirmation, an exact 'y' is required.")
return 1
}
}
// Deregister only works on CSI volumes, but could be extended to support other
// network interfaces or host volumes
err = client.CSIVolumes().Deregister(volID, force, nil)
if err != nil {
c.Ui.Error(fmt.Sprintf("Error deregistering volume: %s", err))
return 1
}
return 0
}