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Expose namespaceSelector for admission webhooks in helm chart (#5074) 

Closes (#5026)

Signed-off-by: Alex Leong <alex@buoyant.io>
Co-authored-by: Raphael Taylor-Davies <r.taylordavies@googlemail.com>
This commit is contained in:
Alex Leong 2020-10-13 16:08:56 -07:00 committed by GitHub
parent f0493a085d
commit 500c1cc2d7
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
30 changed files with 4505 additions and 25 deletions
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4
charts/linkerd2/README.md
View File

@ -156,13 +156,15 @@ their default values.
| `identityPoxyResources` | CPU and Memory resources required by proxy injected into identity pod (see `global.proxy.resources` for sub-fields) | values in `global.proxy.resources` |
| `installNamespace` | Set to false when installing Linkerd in a custom namespace. See the [Linkerd documentation](https://linkerd.io/2/tasks/install-helm/#customizing-the-namespace) for more information. | `true` |
| `omitWebhookSideEffects` | Omit the `sideEffects` flag in the webhook manifests | `false` |
| `proxyInjector.externalSecret` | Do not create a secret resource for the profileValidator webhook. If this is set to `true`, the value `proxyInjector.caBundle` must be set (see below). | false |
| `proxyInjector.externalSecret` | Do not create a secret resource for the profileValidator webhook. If this is set to `true`, the value `proxyInjector.caBundle` must be set (see below). | `false` |
| `proxyInjector.namespaceSelector` | Namespace selector used by admission webhook. If not set defaults to all namespaces without the annotation `config.linkerd.io/admission-webhooks=disabled` | |
| `proxyInjector.crtPEM` | Certificate for the proxy injector. If not provided then Helm will generate one. | |
| `proxyInjector.keyPEM` | Certificate key for the proxy injector. If not provided then Helm will generate one. | |
| `proxyInjector.caBundle` | Bundle of CA certificates for proxy injector. If not provided then Helm will use the certificate generated for `proxyInjector.crtPEM`. If `proxyInjector.externalSecret` is set to true, this value must be set, as no certificate will be generated. | |
| `proxyInjectorResources` | CPU and Memory resources required by the proxy injector (see `global.proxy.resources` for sub-fields) | |
| `proxyInjectorProxyResources` | CPU and Memory resources required by proxy injected into the proxy injector pod (see `global.proxy.resources` for sub-fields) | values in `global.proxy.resources` |
| `profileValidator.externalSecret` | Do not create a secret resource for the profileValidator webhook. If this is set to `true`, the value `profileValidator.caBundle` must be set (see below). | false |
| `profileValidator.namespaceSelector` | Namespace selector used by admission webhook. If not set defaults to all namespaces without the annotation `config.linkerd.io/admission-webhooks=disabled` | |
| `profileValidator.crtPEM` | Certificate for the service profile validator. If not provided then Helm will generate one. | |
| `profileValidator.keyPEM` | Certificate key for the service profile validator. If not provided then Helm will generate one. | |
| `profileValidator.caBundle` | Bundle of CA certificates for service profile validator. If not provided then Helm will use the certificate generated for `profileValidator.crtPEM`. If `profileValidator.externalSecret` is set to true, this value must be set, as no certificate will be generated. | |

6
charts/linkerd2/templates/proxy-injector-rbac.yaml
View File

@ -83,11 +83,7 @@ metadata:
webhooks:
- name: linkerd-proxy-injector.linkerd.io
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
{{- toYaml .Values.proxyInjector.namespaceSelector | trim | nindent 4 }}
clientConfig:
service:
name: linkerd-proxy-injector

6
charts/linkerd2/templates/sp-validator-rbac.yaml
View File

@ -71,11 +71,7 @@ metadata:
webhooks:
- name: linkerd-sp-validator.linkerd.io
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
{{- toYaml .Values.profileValidator.namespaceSelector | trim | nindent 4 }}
clientConfig:
service:
name: linkerd-sp-validator

18
charts/linkerd2/values.yaml
View File

@ -178,6 +178,15 @@ heartbeatSchedule: "0 0 * * *"
# proxy injector configuration
proxyInjector:
externalSecret: false
# Namespace selector used by admission webhook
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
# if empty, Helm will auto-generate these fields
crtPEM: |
@ -194,6 +203,15 @@ proxyInjector:
# service profile validator configuration
profileValidator:
externalSecret: false
# Namespace selector used by admission webhook
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
# if empty, Helm will auto-generate these fields
crtPEM: |

22
cli/cmd/install_helm_test.go
View File

@ -58,6 +58,28 @@ global:
chartControlPlane := chartControlPlane(t, ha, additionalConfig, "333", "444")
testRenderHelm(t, chartControlPlane, "install_helm_output_ha_labels.golden")
})
t.Run("HA mode with custom namespaceSelector", func(t *testing.T) {
ha := true
additionalConfig := `
proxyInjector:
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: In
values:
- enabled
profileValidator:
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: In
values:
- enabled
`
chartControlPlane := chartControlPlane(t, ha, additionalConfig, "111", "222")
testRenderHelm(t, chartControlPlane, "install_helm_output_ha_namespace_selector.golden")
})
}
func testRenderHelm(t *testing.T, chart *pb.Chart, goldenFileName string) {

12
cli/cmd/testdata/install_addon.golden vendored
View File

@ -947,12 +947,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_control-plane.golden vendored
View File

@ -165,12 +165,24 @@ data:
caBundle: ""
crtPEM: ""
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: ""
crtPEM: ""
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_controlplane_tracing_output.golden vendored
View File

@ -947,12 +947,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_custom_registry.golden vendored
View File

@ -947,12 +947,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_default.golden vendored
View File

@ -947,12 +947,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_default_override_dst_get_nets.golden vendored
View File

@ -947,12 +947,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_grafana_existing.golden vendored
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@ -944,12 +944,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_ha_output.golden vendored
View File

@ -972,6 +972,12 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
resources:
@ -985,6 +991,12 @@ data:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources:
cpu:

12
cli/cmd/testdata/install_ha_with_overrides_output.golden vendored
View File

@ -972,6 +972,12 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
resources:
@ -985,6 +991,12 @@ data:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources:
cpu:

12
cli/cmd/testdata/install_heartbeat_disabled_output.golden vendored
View File

@ -903,12 +903,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_helm_output.golden vendored
View File

@ -1122,6 +1122,12 @@ data:
caBundle: test-profile-validator-ca-bundle
crtPEM: test-profile-validator-crt-pem
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
args:
config.file: /etc/prometheus/prometheus.yml
@ -1309,6 +1315,12 @@ data:
caBundle: test-proxy-injector-ca-bundle
crtPEM: test-proxy-injector-crt-pem
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_helm_output_addons.golden vendored
View File

@ -1122,6 +1122,12 @@ data:
caBundle: test-profile-validator-ca-bundle
crtPEM: test-profile-validator-crt-pem
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
args:
config.file: /etc/prometheus/prometheus.yml
@ -1309,6 +1315,12 @@ data:
caBundle: test-proxy-injector-ca-bundle
crtPEM: test-proxy-injector-crt-pem
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_helm_output_ha.golden vendored
View File

@ -1145,6 +1145,12 @@ data:
caBundle: test-profile-validator-ca-bundle
crtPEM: test-profile-validator-crt-pem
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
args:
config.file: /etc/prometheus/prometheus.yml
@ -1337,6 +1343,12 @@ data:
caBundle: test-proxy-injector-ca-bundle
crtPEM: test-proxy-injector-crt-pem
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources:
cpu:

12
cli/cmd/testdata/install_helm_output_ha_labels.golden vendored
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@ -1157,6 +1157,12 @@ data:
caBundle: test-profile-validator-ca-bundle
crtPEM: test-profile-validator-crt-pem
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
args:
config.file: /etc/prometheus/prometheus.yml
@ -1357,6 +1363,12 @@ data:
caBundle: test-proxy-injector-ca-bundle
crtPEM: test-proxy-injector-crt-pem
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources:
cpu:

4168
cli/cmd/testdata/install_helm_output_ha_namespace_selector.golden vendored Normal file
View File

File diff suppressed because it is too large Load Diff

12
cli/cmd/testdata/install_no_init_container.golden vendored
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@ -944,12 +944,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_output.golden vendored
View File

@ -947,6 +947,12 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
image: PrometheusImage
@ -954,6 +960,12 @@ data:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_prometheus_overwrite.golden vendored
View File

@ -947,6 +947,12 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
alertManagers:
- scheme: http
@ -1010,6 +1016,12 @@ data:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_proxy_ignores.golden vendored
View File

@ -947,12 +947,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_restricted_dashboard.golden vendored
View File

@ -879,12 +879,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_tracing.golden vendored
View File

@ -947,12 +947,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

12
cli/cmd/testdata/install_tracing_overwrite.golden vendored
View File

@ -947,12 +947,24 @@ data:
caBundle: profile validator CA bundle
crtPEM: profile validator crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
prometheus:
enabled: true
proxyInjector:
caBundle: proxy injector CA bundle
crtPEM: proxy injector crt
externalSecret: false
namespaceSelector:
matchExpressions:
- key: config.linkerd.io/admission-webhooks
operator: NotIn
values:
- disabled
proxyInjectorProxyResources: null
proxyInjectorResources: null
publicAPIProxyResources: null

8
pkg/charts/linkerd2/values.go
View File

@ -4,6 +4,8 @@ import (
"fmt"
"time"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"github.com/imdario/mergo"
"github.com/linkerd/linkerd2/pkg/charts"
"github.com/linkerd/linkerd2/pkg/k8s"
@ -214,11 +216,13 @@ type (
// ProxyInjector has all the proxy injector's Helm variables
ProxyInjector struct {
*TLS
NamespaceSelector *metav1.LabelSelector `json:"namespaceSelector"`
}
// ProfileValidator has all the profile validator's Helm variables
ProfileValidator struct {
*TLS
NamespaceSelector *metav1.LabelSelector `json:"namespaceSelector"`
}
// Tap has all the Tap's Helm variables
@ -262,8 +266,8 @@ func NewValues(ha bool) (*Values, error) {
v.Global.Proxy.Image.Version = version.Version
v.DebugContainer.Image.Version = version.Version
v.Global.CliVersion = k8s.CreatedByAnnotationValue()
v.ProfileValidator = &ProfileValidator{TLS: &TLS{}}
v.ProxyInjector = &ProxyInjector{TLS: &TLS{}}
v.ProfileValidator.TLS = &TLS{}
v.ProxyInjector.TLS = &TLS{}
v.Global.ProxyContainerName = k8s.ProxyContainerName
v.Tap = &Tap{TLS: &TLS{}}

16
pkg/charts/linkerd2/values_test.go
View File

@ -4,6 +4,8 @@ import (
"reflect"
"testing"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"github.com/linkerd/linkerd2/pkg/version"
)
@ -15,6 +17,16 @@ func TestNewValues(t *testing.T) {
testVersion := "linkerd-dev"
namespaceSelector := &metav1.LabelSelector{
MatchExpressions: []metav1.LabelSelectorRequirement{
{
Key: "config.linkerd.io/admission-webhooks",
Operator: "NotIn",
Values: []string{"disabled"},
},
},
}
expected := &Values{
ControllerImage: "ghcr.io/linkerd/controller",
ControllerImageVersion: testVersion,
@ -134,8 +146,8 @@ func TestNewValues(t *testing.T) {
},
},
ProxyInjector: &ProxyInjector{TLS: &TLS{}},
ProfileValidator: &ProfileValidator{TLS: &TLS{}},
ProxyInjector: &ProxyInjector{TLS: &TLS{}, NamespaceSelector: namespaceSelector},
ProfileValidator: &ProfileValidator{TLS: &TLS{}, NamespaceSelector: namespaceSelector},
Tap: &Tap{TLS: &TLS{}},
Grafana: Grafana{
"enabled": true,

28
pkg/tree/tree.go
View File

@ -152,20 +152,30 @@ func Diff(x interface{}, y interface{}) (Tree, error) {
return xTree.Diff(yTree)
}
// coerceTreeValue accepts a value and returns a value where all child values
// have been coerced to a Tree where such a coercion is possible
func coerceTreeValue(v interface{}) interface{} {
if vt, ok := v.(Tree); ok {
vt.coerceToTree()
} else if vm, ok := v.(map[string]interface{}); ok {
tree := Tree(vm)
tree.coerceToTree()
return tree
} else if va, ok := v.([]interface{}); ok {
for i, v := range va {
va[i] = coerceTreeValue(v)
}
}
return v
}
// coerceToTree recursively casts all instances of map[string]interface{} into
// Tree within this Tree. When a tree document is unmarshaled, the subtrees
// will typically be unmarshaled as map[string]interface{} values. We cast
// each of these into the Tree newtype so that the Tree type is used uniformly
// throughout the tree.
// throughout the tree. Will additionally recurse through arrays
func (t Tree) coerceToTree() {
for k, v := range t {
if vt, ok := v.(Tree); ok {
vt.coerceToTree()
}
if vm, ok := v.(map[string]interface{}); ok {
vt := Tree(vm)
vt.coerceToTree()
t[k] = vt
}
t[k] = coerceTreeValue(v)
}
}