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file_config.rs
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file_config.rs
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use std::{
collections::HashMap,
fs,
path::{Path, PathBuf},
};
use secrecy::{ExposeSecret, SecretString};
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use super::{KubeconfigError, LoadDataError};
/// [`Kubeconfig`] represents information on how to connect to a remote Kubernetes cluster
///
/// Stored in `~/.kube/config` by default, but can be distributed across multiple paths in passed through `KUBECONFIG`.
/// An analogue of the [config type from client-go](https://github.com/kubernetes/client-go/blob/7697067af71046b18e03dbda04e01a5bb17f9809/tools/clientcmd/api/types.go).
///
/// This type (and its children) are exposed primarily for convenience.
///
/// [`Config`][crate::Config] is the __intended__ developer interface to help create a [`Client`][crate::Client],
/// and this will handle the difference between in-cluster deployment and local development.
#[derive(Clone, Debug, Serialize, Deserialize, Default)]
#[cfg_attr(test, derive(PartialEq))]
pub struct Kubeconfig {
/// General information to be use for cli interactions
#[serde(skip_serializing_if = "Option::is_none")]
pub preferences: Option<Preferences>,
/// Referencable names to cluster configs
pub clusters: Vec<NamedCluster>,
/// Referencable names to user configs
#[serde(rename = "users")]
pub auth_infos: Vec<NamedAuthInfo>,
/// Referencable names to context configs
pub contexts: Vec<NamedContext>,
/// The name of the context that you would like to use by default
#[serde(rename = "current-context")]
#[serde(skip_serializing_if = "Option::is_none")]
pub current_context: Option<String>,
/// Additional information for extenders so that reads and writes don't clobber unknown fields.
#[serde(skip_serializing_if = "Option::is_none")]
pub extensions: Option<Vec<NamedExtension>>,
// legacy fields TODO: remove
/// Legacy field from TypeMeta
#[serde(skip_serializing_if = "Option::is_none")]
pub kind: Option<String>,
/// Legacy field from TypeMeta
#[serde(rename = "apiVersion")]
#[serde(skip_serializing_if = "Option::is_none")]
pub api_version: Option<String>,
}
/// Preferences stores extensions for cli.
#[derive(Clone, Debug, Serialize, Deserialize)]
#[cfg_attr(test, derive(PartialEq))]
pub struct Preferences {
/// Enable colors
#[serde(skip_serializing_if = "Option::is_none")]
pub colors: Option<bool>,
/// Extensions holds additional information. This is useful for extenders so that reads and writes don't clobber unknown fields.
#[serde(skip_serializing_if = "Option::is_none")]
pub extensions: Option<Vec<NamedExtension>>,
}
/// NamedExtention associates name with extension.
#[derive(Clone, Debug, Serialize, Deserialize)]
#[cfg_attr(test, derive(PartialEq))]
pub struct NamedExtension {
/// Name of extension
pub name: String,
/// Additional information for extenders so that reads and writes don't clobber unknown fields
pub extension: serde_json::Value,
}
/// NamedCluster associates name with cluster.
#[derive(Clone, Debug, Serialize, Deserialize)]
#[cfg_attr(test, derive(PartialEq))]
pub struct NamedCluster {
/// Name of cluster
pub name: String,
/// Information about how to communicate with a kubernetes cluster
pub cluster: Cluster,
}
/// Cluster stores information to connect Kubernetes cluster.
#[derive(Clone, Debug, Serialize, Deserialize)]
#[cfg_attr(test, derive(PartialEq))]
pub struct Cluster {
/// The address of the kubernetes cluster (https://hostname:port).
pub server: String,
/// Skips the validity check for the server's certificate. This will make your HTTPS connections insecure.
#[serde(rename = "insecure-skip-tls-verify")]
#[serde(skip_serializing_if = "Option::is_none")]
pub insecure_skip_tls_verify: Option<bool>,
/// The path to a cert file for the certificate authority.
#[serde(rename = "certificate-authority")]
#[serde(skip_serializing_if = "Option::is_none")]
pub certificate_authority: Option<String>,
/// PEM-encoded certificate authority certificates. Overrides `certificate_authority`
#[serde(rename = "certificate-authority-data")]
#[serde(skip_serializing_if = "Option::is_none")]
pub certificate_authority_data: Option<String>,
/// URL to the proxy to be used for all requests.
#[serde(rename = "proxy-url")]
#[serde(skip_serializing_if = "Option::is_none")]
pub proxy_url: Option<String>,
/// Additional information for extenders so that reads and writes don't clobber unknown fields
#[serde(skip_serializing_if = "Option::is_none")]
pub extensions: Option<Vec<NamedExtension>>,
}
/// NamedAuthInfo associates name with authentication.
#[derive(Clone, Debug, Serialize, Deserialize)]
#[cfg_attr(test, derive(PartialEq))]
pub struct NamedAuthInfo {
/// Name of the user
pub name: String,
/// Information that describes identity of the user
#[serde(rename = "user")]
pub auth_info: AuthInfo,
}
fn serialize_secretstring<S>(pw: &Option<SecretString>, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
match pw {
Some(secret) => serializer.serialize_str(secret.expose_secret()),
None => serializer.serialize_none(),
}
}
fn deserialize_secretstring<'de, D>(deserializer: D) -> Result<Option<SecretString>, D::Error>
where
D: Deserializer<'de>,
{
match String::deserialize(deserializer) {
Ok(secret) => Ok(Some(SecretString::new(secret))),
Err(e) => Err(e),
}
}
/// AuthInfo stores information to tell cluster who you are.
#[derive(Clone, Debug, Serialize, Deserialize, Default)]
pub struct AuthInfo {
/// The username for basic authentication to the kubernetes cluster.
#[serde(skip_serializing_if = "Option::is_none")]
pub username: Option<String>,
/// The password for basic authentication to the kubernetes cluster.
#[serde(skip_serializing_if = "Option::is_none", default)]
#[serde(
serialize_with = "serialize_secretstring",
deserialize_with = "deserialize_secretstring"
)]
pub password: Option<SecretString>,
/// The bearer token for authentication to the kubernetes cluster.
#[serde(skip_serializing_if = "Option::is_none", default)]
#[serde(
serialize_with = "serialize_secretstring",
deserialize_with = "deserialize_secretstring"
)]
pub token: Option<SecretString>,
/// Pointer to a file that contains a bearer token (as described above). If both `token` and token_file` are present, `token` takes precedence.
#[serde(rename = "tokenFile")]
#[serde(skip_serializing_if = "Option::is_none")]
pub token_file: Option<String>,
/// Path to a client cert file for TLS.
#[serde(rename = "client-certificate")]
#[serde(skip_serializing_if = "Option::is_none")]
pub client_certificate: Option<String>,
/// PEM-encoded data from a client cert file for TLS. Overrides `client_certificate`
#[serde(rename = "client-certificate-data")]
#[serde(skip_serializing_if = "Option::is_none")]
pub client_certificate_data: Option<String>,
/// Path to a client key file for TLS.
#[serde(rename = "client-key")]
#[serde(skip_serializing_if = "Option::is_none")]
pub client_key: Option<String>,
/// PEM-encoded data from a client key file for TLS. Overrides `client_key`
#[serde(rename = "client-key-data")]
#[serde(skip_serializing_if = "Option::is_none", default)]
#[serde(
serialize_with = "serialize_secretstring",
deserialize_with = "deserialize_secretstring"
)]
pub client_key_data: Option<SecretString>,
/// The username to act-as.
#[serde(rename = "as")]
#[serde(skip_serializing_if = "Option::is_none")]
pub impersonate: Option<String>,
/// The groups to imperonate.
#[serde(rename = "as-groups")]
#[serde(skip_serializing_if = "Option::is_none")]
pub impersonate_groups: Option<Vec<String>>,
/// Specifies a custom authentication plugin for the kubernetes cluster.
#[serde(rename = "auth-provider")]
#[serde(skip_serializing_if = "Option::is_none")]
pub auth_provider: Option<AuthProviderConfig>,
/// Specifies a custom exec-based authentication plugin for the kubernetes cluster.
#[serde(skip_serializing_if = "Option::is_none")]
pub exec: Option<ExecConfig>,
}
#[cfg(test)]
impl PartialEq for AuthInfo {
fn eq(&self, other: &Self) -> bool {
serde_json::to_value(&self).unwrap() == serde_json::to_value(&other).unwrap()
}
}
/// AuthProviderConfig stores auth for specified cloud provider.
#[derive(Clone, Debug, Serialize, Deserialize)]
#[cfg_attr(test, derive(PartialEq))]
pub struct AuthProviderConfig {
/// Name of the auth provider
pub name: String,
/// Auth provider configuration
pub config: HashMap<String, String>,
}
/// ExecConfig stores credential-plugin configuration.
#[derive(Clone, Debug, Serialize, Deserialize)]
#[cfg_attr(test, derive(PartialEq))]
pub struct ExecConfig {
/// Preferred input version of the ExecInfo.
///
/// The returned ExecCredentials MUST use the same encoding version as the input.
#[serde(rename = "apiVersion")]
#[serde(skip_serializing_if = "Option::is_none")]
pub api_version: Option<String>,
/// Command to execute.
pub command: String,
/// Arguments to pass to the command when executing it.
#[serde(skip_serializing_if = "Option::is_none")]
pub args: Option<Vec<String>>,
/// Env defines additional environment variables to expose to the process.
///
/// TODO: These are unioned with the host's environment, as well as variables client-go uses to pass argument to the plugin.
#[serde(skip_serializing_if = "Option::is_none")]
pub env: Option<Vec<HashMap<String, String>>>,
}
/// NamedContext associates name with context.
#[derive(Clone, Debug, Serialize, Deserialize)]
#[cfg_attr(test, derive(PartialEq))]
pub struct NamedContext {
/// Name of the context
pub name: String,
/// Associations for the context
pub context: Context,
}
/// Context stores tuple of cluster and user information.
#[derive(Clone, Debug, Serialize, Deserialize)]
#[cfg_attr(test, derive(PartialEq))]
pub struct Context {
/// Name of the cluster for this context
pub cluster: String,
/// Name of the `AuthInfo` for this context
pub user: String,
/// The default namespace to use on unspecified requests
#[serde(skip_serializing_if = "Option::is_none")]
pub namespace: Option<String>,
/// Additional information for extenders so that reads and writes don't clobber unknown fields
#[serde(skip_serializing_if = "Option::is_none")]
pub extensions: Option<Vec<NamedExtension>>,
}
const KUBECONFIG: &str = "KUBECONFIG";
/// Some helpers on the raw Config object are exposed for people needing to parse it
impl Kubeconfig {
/// Read a Config from an arbitrary location
pub fn read_from<P: AsRef<Path>>(path: P) -> Result<Kubeconfig, KubeconfigError> {
let data = fs::read_to_string(&path)
.map_err(|source| KubeconfigError::ReadConfig(source, path.as_ref().into()))?;
// Remap all files we read to absolute paths.
let mut merged_docs = None;
for mut config in kubeconfig_from_yaml(&data)? {
if let Some(dir) = path.as_ref().parent() {
for named in config.clusters.iter_mut() {
if let Some(path) = &named.cluster.certificate_authority {
if let Some(abs_path) = to_absolute(dir, path) {
named.cluster.certificate_authority = Some(abs_path);
}
}
}
for named in config.auth_infos.iter_mut() {
if let Some(path) = &named.auth_info.client_certificate {
if let Some(abs_path) = to_absolute(dir, path) {
named.auth_info.client_certificate = Some(abs_path);
}
}
if let Some(path) = &named.auth_info.client_key {
if let Some(abs_path) = to_absolute(dir, path) {
named.auth_info.client_key = Some(abs_path);
}
}
if let Some(path) = &named.auth_info.token_file {
if let Some(abs_path) = to_absolute(dir, path) {
named.auth_info.token_file = Some(abs_path);
}
}
}
}
if let Some(c) = merged_docs {
merged_docs = Some(Kubeconfig::merge(c, config)?);
} else {
merged_docs = Some(config);
}
}
// Empty file defaults to an empty Kubeconfig
Ok(merged_docs.unwrap_or_default())
}
/// Read a Config from an arbitrary YAML string
///
/// This is preferable to using serde_yaml::from_str() because it will correctly
/// parse multi-document YAML text and merge them into a single `Kubeconfig`
pub fn from_yaml(text: &str) -> Result<Kubeconfig, KubeconfigError> {
kubeconfig_from_yaml(text)?
.into_iter()
.try_fold(Kubeconfig::default(), Kubeconfig::merge)
}
/// Read a Config from `KUBECONFIG` or the the default location.
pub fn read() -> Result<Kubeconfig, KubeconfigError> {
match Self::from_env()? {
Some(config) => Ok(config),
None => Self::read_from(default_kube_path().ok_or(KubeconfigError::FindPath)?),
}
}
/// Create `Kubeconfig` from `KUBECONFIG` environment variable.
/// Supports list of files to be merged.
///
/// # Panics
///
/// Panics if `KUBECONFIG` value contains the NUL character.
pub fn from_env() -> Result<Option<Self>, KubeconfigError> {
match std::env::var_os(KUBECONFIG) {
Some(value) => {
let paths = std::env::split_paths(&value)
.filter(|p| !p.as_os_str().is_empty())
.collect::<Vec<_>>();
if paths.is_empty() {
return Ok(None);
}
let merged = paths.iter().try_fold(Kubeconfig::default(), |m, p| {
Kubeconfig::read_from(p).and_then(|c| m.merge(c))
})?;
Ok(Some(merged))
}
None => Ok(None),
}
}
/// Merge kubeconfig file according to the rules described in
/// <https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/#merging-kubeconfig-files>
///
/// > Merge the files listed in the `KUBECONFIG` environment variable according to these rules:
/// >
/// > - Ignore empty filenames.
/// > - Produce errors for files with content that cannot be deserialized.
/// > - The first file to set a particular value or map key wins.
/// > - Never change the value or map key.
/// > Example: Preserve the context of the first file to set `current-context`.
/// > Example: If two files specify a `red-user`, use only values from the first file's `red-user`.
/// > Even if the second file has non-conflicting entries under `red-user`, discard them.
fn merge(mut self, next: Kubeconfig) -> Result<Self, KubeconfigError> {
if self.kind.is_some() && next.kind.is_some() && self.kind != next.kind {
return Err(KubeconfigError::KindMismatch);
}
if self.api_version.is_some() && next.api_version.is_some() && self.api_version != next.api_version {
return Err(KubeconfigError::ApiVersionMismatch);
}
self.kind = self.kind.or(next.kind);
self.api_version = self.api_version.or(next.api_version);
self.preferences = self.preferences.or(next.preferences);
append_new_named(&mut self.clusters, next.clusters, |x| &x.name);
append_new_named(&mut self.auth_infos, next.auth_infos, |x| &x.name);
append_new_named(&mut self.contexts, next.contexts, |x| &x.name);
self.current_context = self.current_context.or(next.current_context);
self.extensions = self.extensions.or(next.extensions);
Ok(self)
}
}
fn kubeconfig_from_yaml(text: &str) -> Result<Vec<Kubeconfig>, KubeconfigError> {
let mut documents = vec![];
for doc in serde_yaml::Deserializer::from_str(text) {
let value = serde_yaml::Value::deserialize(doc).map_err(KubeconfigError::Parse)?;
let kubeconfig = serde_yaml::from_value(value).map_err(KubeconfigError::InvalidStructure)?;
documents.push(kubeconfig);
}
Ok(documents)
}
#[allow(clippy::redundant_closure)]
fn append_new_named<T, F>(base: &mut Vec<T>, next: Vec<T>, f: F)
where
F: Fn(&T) -> &String,
{
use std::collections::HashSet;
base.extend({
let existing = base.iter().map(|x| f(x)).collect::<HashSet<_>>();
next.into_iter()
.filter(|x| !existing.contains(f(x)))
.collect::<Vec<_>>()
});
}
fn to_absolute(dir: &Path, file: &str) -> Option<String> {
let path = Path::new(&file);
if path.is_relative() {
dir.join(path).to_str().map(str::to_owned)
} else {
None
}
}
impl Cluster {
pub(crate) fn load_certificate_authority(&self) -> Result<Option<Vec<u8>>, KubeconfigError> {
if self.certificate_authority.is_none() && self.certificate_authority_data.is_none() {
return Ok(None);
}
let ca = load_from_base64_or_file(
&self.certificate_authority_data.as_deref(),
&self.certificate_authority,
)
.map_err(KubeconfigError::LoadCertificateAuthority)?;
Ok(Some(ca))
}
}
impl AuthInfo {
pub(crate) fn identity_pem(&self) -> Result<Vec<u8>, KubeconfigError> {
let client_cert = &self.load_client_certificate()?;
let client_key = &self.load_client_key()?;
let mut buffer = client_key.clone();
buffer.extend_from_slice(client_cert);
Ok(buffer)
}
pub(crate) fn load_client_certificate(&self) -> Result<Vec<u8>, KubeconfigError> {
// TODO Shouldn't error when `self.client_certificate_data.is_none() && self.client_certificate.is_none()`
load_from_base64_or_file(&self.client_certificate_data.as_deref(), &self.client_certificate)
.map_err(KubeconfigError::LoadClientCertificate)
}
pub(crate) fn load_client_key(&self) -> Result<Vec<u8>, KubeconfigError> {
// TODO Shouldn't error when `self.client_key_data.is_none() && self.client_key.is_none()`
load_from_base64_or_file(
&self
.client_key_data
.as_ref()
.map(|secret| secret.expose_secret().as_str()),
&self.client_key,
)
.map_err(KubeconfigError::LoadClientKey)
}
}
fn load_from_base64_or_file<P: AsRef<Path>>(
value: &Option<&str>,
file: &Option<P>,
) -> Result<Vec<u8>, LoadDataError> {
let data = value
.map(load_from_base64)
.or_else(|| file.as_ref().map(load_from_file))
.unwrap_or(Err(LoadDataError::NoBase64DataOrFile))?;
Ok(ensure_trailing_newline(data))
}
fn load_from_base64(value: &str) -> Result<Vec<u8>, LoadDataError> {
base64::decode(&value).map_err(LoadDataError::DecodeBase64)
}
fn load_from_file<P: AsRef<Path>>(file: &P) -> Result<Vec<u8>, LoadDataError> {
fs::read(&file).map_err(|source| LoadDataError::ReadFile(source, file.as_ref().into()))
}
// Ensure there is a trailing newline in the blob
// Don't bother if the blob is empty
fn ensure_trailing_newline(mut data: Vec<u8>) -> Vec<u8> {
if data.last().map(|end| *end != b'\n').unwrap_or(false) {
data.push(b'\n');
}
data
}
/// Returns kubeconfig path from `$HOME/.kube/config`.
fn default_kube_path() -> Option<PathBuf> {
use dirs::home_dir;
home_dir().map(|h| h.join(".kube").join("config"))
}
#[cfg(test)]
mod tests {
use super::*;
use serde_json::Value;
use std::str::FromStr;
#[test]
fn kubeconfig_merge() {
let kubeconfig1 = Kubeconfig {
current_context: Some("default".into()),
auth_infos: vec![NamedAuthInfo {
name: "red-user".into(),
auth_info: AuthInfo {
token: Some(SecretString::from_str("first-token").unwrap()),
..Default::default()
},
}],
..Default::default()
};
let kubeconfig2 = Kubeconfig {
current_context: Some("dev".into()),
auth_infos: vec![
NamedAuthInfo {
name: "red-user".into(),
auth_info: AuthInfo {
token: Some(SecretString::from_str("second-token").unwrap()),
username: Some("red-user".into()),
..Default::default()
},
},
NamedAuthInfo {
name: "green-user".into(),
auth_info: AuthInfo {
token: Some(SecretString::from_str("new-token").unwrap()),
..Default::default()
},
},
],
..Default::default()
};
let merged = kubeconfig1.merge(kubeconfig2).unwrap();
// Preserves first `current_context`
assert_eq!(merged.current_context, Some("default".into()));
// Auth info with the same name does not overwrite
assert_eq!(merged.auth_infos[0].name, "red-user".to_owned());
assert_eq!(
merged.auth_infos[0]
.auth_info
.token
.as_ref()
.map(|t| t.expose_secret().to_string()),
Some("first-token".to_string())
);
// Even if it's not conflicting
assert_eq!(merged.auth_infos[0].auth_info.username, None);
// New named auth info is appended
assert_eq!(merged.auth_infos[1].name, "green-user".to_owned());
}
#[test]
fn kubeconfig_deserialize() {
let config_yaml = "apiVersion: v1
clusters:
- cluster:
certificate-authority-data: LS0t<SNIP>LS0tLQo=
server: https://ABCDEF0123456789.gr7.us-west-2.eks.amazonaws.com
name: eks
- cluster:
certificate-authority: /home/kevin/.minikube/ca.crt
extensions:
- extension:
last-update: Thu, 18 Feb 2021 16:59:26 PST
provider: minikube.sigs.k8s.io
version: v1.17.1
name: cluster_info
server: https://192.168.49.2:8443
name: minikube
contexts:
- context:
cluster: minikube
extensions:
- extension:
last-update: Thu, 18 Feb 2021 16:59:26 PST
provider: minikube.sigs.k8s.io
version: v1.17.1
name: context_info
namespace: default
user: minikube
name: minikube
- context:
cluster: arn:aws:eks:us-west-2:012345678912:cluster/eks
user: arn:aws:eks:us-west-2:012345678912:cluster/eks
name: eks
current-context: minikube
kind: Config
preferences: {}
users:
- name: arn:aws:eks:us-west-2:012345678912:cluster/eks
user:
exec:
apiVersion: client.authentication.k8s.io/v1alpha1
args:
- --region
- us-west-2
- eks
- get-token
- --cluster-name
- eks
command: aws
env: null
provideClusterInfo: false
- name: minikube
user:
client-certificate: /home/kevin/.minikube/profiles/minikube/client.crt
client-key: /home/kevin/.minikube/profiles/minikube/client.key";
let config = Kubeconfig::from_yaml(config_yaml).unwrap();
assert_eq!(config.clusters[0].name, "eks");
assert_eq!(config.clusters[1].name, "minikube");
assert_eq!(
config.clusters[1].cluster.extensions.as_ref().unwrap()[0]
.extension
.get("provider"),
Some(&Value::String("minikube.sigs.k8s.io".to_owned()))
);
}
#[test]
fn kubeconfig_multi_document_merge() -> Result<(), KubeconfigError> {
let config_yaml = r#"---
apiVersion: v1
clusters:
- cluster:
certificate-authority-data: aGVsbG8K
server: https://0.0.0.0:6443
name: k3d-promstack
contexts:
- context:
cluster: k3d-promstack
user: admin@k3d-promstack
name: k3d-promstack
current-context: k3d-promstack
kind: Config
preferences: {}
users:
- name: admin@k3d-promstack
user:
client-certificate-data: aGVsbG8K
client-key-data: aGVsbG8K
---
apiVersion: v1
clusters:
- cluster:
certificate-authority-data: aGVsbG8K
server: https://0.0.0.0:6443
name: k3d-k3s-default
contexts:
- context:
cluster: k3d-k3s-default
user: admin@k3d-k3s-default
name: k3d-k3s-default
current-context: k3d-k3s-default
kind: Config
preferences: {}
users:
- name: admin@k3d-k3s-default
user:
client-certificate-data: aGVsbG8K
client-key-data: aGVsbG8K
"#;
let cfg = Kubeconfig::from_yaml(config_yaml)?;
// Ensure we have data from both documents:
assert_eq!(cfg.clusters[0].name, "k3d-promstack");
assert_eq!(cfg.clusters[1].name, "k3d-k3s-default");
Ok(())
}
#[test]
fn kubeconfig_from_empty_string() {
let cfg = Kubeconfig::from_yaml("").unwrap();
assert_eq!(cfg, Kubeconfig::default());
}
#[test]
fn authinfo_debug_does_not_output_password() {
let authinfo_yaml = r#"
username: user
password: kube_rs
"#;
let authinfo: AuthInfo = serde_yaml::from_str(authinfo_yaml).unwrap();
let authinfo_debug_output = format!("{:?}", authinfo);
let expected_output = "AuthInfo { \
username: Some(\"user\"), \
password: Some(Secret([REDACTED alloc::string::String])), \
token: None, token_file: None, client_certificate: None, \
client_certificate_data: None, client_key: None, \
client_key_data: None, impersonate: None, \
impersonate_groups: None, \
auth_provider: None, \
exec: None \
}";
assert_eq!(authinfo_debug_output, expected_output)
}
}