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kv_patch.go
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kv_patch.go
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package command
import (
"fmt"
"io"
"os"
"strings"
"github.com/mitchellh/cli"
"github.com/posener/complete"
)
var _ cli.Command = (*KVPatchCommand)(nil)
var _ cli.CommandAutocomplete = (*KVPatchCommand)(nil)
type KVPatchCommand struct {
*BaseCommand
testStdin io.Reader // for tests
}
func (c *KVPatchCommand) Synopsis() string {
return "Sets or updates data in the KV store without overwriting"
}
func (c *KVPatchCommand) Help() string {
helpText := `
Usage: vault kv patch [options] KEY [DATA]
*NOTE*: This is only supported for KV v2 engine mounts.
Writes the data to the given path in the key-value store. The data can be of
any type.
$ vault kv patch secret/foo bar=baz
The data can also be consumed from a file on disk by prefixing with the "@"
symbol. For example:
$ vault kv patch secret/foo @data.json
Or it can be read from stdin using the "-" symbol:
$ echo "abcd1234" | vault kv patch secret/foo bar=-
Additional flags and more advanced use cases are detailed below.
` + c.Flags().Help()
return strings.TrimSpace(helpText)
}
func (c *KVPatchCommand) Flags() *FlagSets {
set := c.flagSet(FlagSetHTTP | FlagSetOutputField | FlagSetOutputFormat)
return set
}
func (c *KVPatchCommand) AutocompleteArgs() complete.Predictor {
return nil
}
func (c *KVPatchCommand) AutocompleteFlags() complete.Flags {
return c.Flags().Completions()
}
func (c *KVPatchCommand) Run(args []string) int {
f := c.Flags()
if err := f.Parse(args); err != nil {
c.UI.Error(err.Error())
return 1
}
args = f.Args()
// Pull our fake stdin if needed
stdin := (io.Reader)(os.Stdin)
if c.testStdin != nil {
stdin = c.testStdin
}
switch {
case len(args) < 1:
c.UI.Error(fmt.Sprintf("Not enough arguments (expected >1, got %d)", len(args)))
return 1
case len(args) == 1:
c.UI.Error("Must supply data")
return 1
}
var err error
path := sanitizePath(args[0])
client, err := c.Client()
if err != nil {
c.UI.Error(err.Error())
return 2
}
newData, err := parseArgsData(stdin, args[1:])
if err != nil {
c.UI.Error(fmt.Sprintf("Failed to parse K=V data: %s", err))
return 1
}
mountPath, v2, err := isKVv2(path, client)
if err != nil {
c.UI.Error(err.Error())
return 2
}
if !v2 {
c.UI.Error(fmt.Sprintf("K/V engine mount must be version 2 for patch support"))
return 2
}
path = addPrefixToVKVPath(path, mountPath, "data")
if err != nil {
c.UI.Error(err.Error())
return 2
}
// First, do a read.
// Note that we don't want to see curl output for the read request.
curOutputCurl := client.OutputCurlString()
client.SetOutputCurlString(false)
secret, err := kvReadRequest(client, path, nil)
client.SetOutputCurlString(curOutputCurl)
if err != nil {
c.UI.Error(fmt.Sprintf("Error doing pre-read at %s: %s", path, err))
return 2
}
// Make sure a value already exists
if secret == nil || secret.Data == nil {
c.UI.Error(fmt.Sprintf("No value found at %s", path))
return 2
}
// Verify metadata found
rawMeta, ok := secret.Data["metadata"]
if !ok || rawMeta == nil {
c.UI.Error(fmt.Sprintf("No metadata found at %s; patch only works on existing data", path))
return 2
}
meta, ok := rawMeta.(map[string]interface{})
if !ok {
c.UI.Error(fmt.Sprintf("Metadata found at %s is not the expected type (JSON object)", path))
return 2
}
if meta == nil {
c.UI.Error(fmt.Sprintf("No metadata found at %s; patch only works on existing data", path))
return 2
}
// Verify old data found
rawData, ok := secret.Data["data"]
if !ok || rawData == nil {
c.UI.Error(fmt.Sprintf("No data found at %s; patch only works on existing data", path))
return 2
}
data, ok := rawData.(map[string]interface{})
if !ok {
c.UI.Error(fmt.Sprintf("Data found at %s is not the expected type (JSON object)", path))
return 2
}
if data == nil {
c.UI.Error(fmt.Sprintf("No data found at %s; patch only works on existing data", path))
return 2
}
// Copy new data over
for k, v := range newData {
data[k] = v
}
secret, err = client.Logical().Write(path, map[string]interface{}{
"data": data,
"options": map[string]interface{}{
"cas": meta["version"],
},
})
if err != nil {
c.UI.Error(fmt.Sprintf("Error writing data to %s: %s", path, err))
return 2
}
if secret == nil {
// Don't output anything unless using the "table" format
if Format(c.UI) == "table" {
c.UI.Info(fmt.Sprintf("Success! Data written to: %s", path))
}
return 0
}
if c.flagField != "" {
return PrintRawField(c.UI, secret, c.flagField)
}
return OutputSecret(c.UI, secret)
}