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metadata.go
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metadata.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package cluster
import (
"context"
"fmt"
"os"
"github.com/spf13/cobra"
"golang.org/x/exp/slices"
"namespacelabs.dev/foundation/internal/cli/fncobra"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/fnapi"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/providers/nscloud/metadata"
)
const (
defaultMetadataSpecFile = "/var/run/nsc/token.spec"
)
var supportedMetadataKeys = []string{"id"}
func NewMetadataCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "metadata",
Short: "Interact with instance metadata.",
}
cmd.AddCommand(newReadCmd())
return cmd
}
func newReadCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "read [metadata-key]",
Short: "Read a metadata value for the provided key.",
Args: cobra.MinimumNArgs(1),
}
cmd.RunE = fncobra.RunE(func(ctx context.Context, args []string) error {
metadataKey := args[0]
if !slices.Contains(supportedMetadataKeys, metadataKey) {
return fnerrors.New("reading instance metadata value for the key %q is not supported", metadataKey)
}
spec, err := fnapi.ResolveSpec()
if err != nil {
return err
}
if spec == "" {
s, err := os.ReadFile(defaultMetadataSpecFile)
if err != nil {
return fnerrors.New("failed to read metadata spec file: %w", err)
}
spec = string(s)
}
value, err := metadata.FetchValueFromSpec(ctx, spec, metadataKey)
if err != nil {
return err
}
fmt.Fprintf(console.Stdout(ctx), value+"\n")
return nil
})
return cmd
}