fix(kubernetes): Parse stacked kubeconfigs (#1678)
Have refactored the kubernetes module to better support stacked kubeconfigs. Rather than trying to grab both the current-context and namespace on a single pass we now do two passes. These changes should fix the problems where the current-context is defined in one file but the context and the namespace are defined in a different file.
This commit is contained in:
Thomas O'Donnell
GitHub
parent
975d3232c8
commit
c938eac1d6
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@ -9,7 +9,9 @@ use crate::configs::kubernetes::KubernetesConfig;
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use crate::formatter::StringFormatter;
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use crate::utils;
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fn get_kube_context(contents: &str) -> Option<(String, String)> {
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fn get_kube_context(filename: path::PathBuf) -> Option<String> {
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let contents = utils::read_file(filename).ok()?;
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let yaml_docs = YamlLoader::load_from_str(&contents).ok()?;
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if yaml_docs.is_empty() {
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return None;
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@ -21,41 +23,33 @@ fn get_kube_context(contents: &str) -> Option<(String, String)> {
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if current_ctx.is_empty() {
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return None;
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}
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Some(current_ctx.to_string())
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}
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let ns = conf["contexts"]
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.as_vec()
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.and_then(|contexts| {
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fn get_kube_ns(filename: path::PathBuf, current_ctx: String) -> Option<String> {
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let contents = utils::read_file(filename).ok()?;
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let yaml_docs = YamlLoader::load_from_str(&contents).ok()?;
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if yaml_docs.is_empty() {
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return None;
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}
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let conf = &yaml_docs[0];
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let ns = conf["contexts"].as_vec().and_then(|contexts| {
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contexts
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.iter()
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.filter_map(|ctx| Some((ctx, ctx["name"].as_str()?)))
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.find(|(_, name)| *name == current_ctx)
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.and_then(|(ctx, _)| ctx["context"]["namespace"].as_str())
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})
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.unwrap_or("");
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})?;
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Some((current_ctx.to_string(), ns.to_string()))
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if ns.is_empty() {
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return None;
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}
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fn parse_kubectl_file(filename: &path::PathBuf) -> Option<(String, String)> {
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let contents = utils::read_file(filename).ok()?;
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get_kube_context(&contents)
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Some(ns.to_owned())
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}
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pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
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let kube_cfg = match context.get_env("KUBECONFIG") {
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Some(paths) => env::split_paths(&paths)
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.filter_map(|filename| parse_kubectl_file(&filename))
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.next(),
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None => {
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let filename = dirs_next::home_dir()?.join(".kube").join("config");
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parse_kubectl_file(&filename)
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}
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};
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match kube_cfg {
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Some(kube_cfg) => {
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let (kube_ctx, kube_ns) = kube_cfg;
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let mut module = context.new_module("kubernetes");
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let config: KubernetesConfig = KubernetesConfig::try_load(module.config);
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@ -65,6 +59,17 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
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return None;
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};
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let default_config_file = dirs_next::home_dir()?.join(".kube").join("config");
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let kube_cfg = context
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.get_env("KUBECONFIG")
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.unwrap_or(default_config_file.to_str()?.to_string());
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let kube_ctx = env::split_paths(&kube_cfg).find_map(get_kube_context)?;
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let kube_ns =
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env::split_paths(&kube_cfg).find_map(|filename| get_kube_ns(filename, kube_ctx.clone()));
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let parsed = StringFormatter::new(config.format).and_then(|formatter| {
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formatter
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.map_meta(|variable, _| match variable {
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@ -80,16 +85,10 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
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None => Some(Ok(kube_ctx.as_str())),
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Some(&alias) => Some(Ok(alias)),
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},
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_ => None,
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})
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.map(|variable| match variable {
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"namespace" => {
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if kube_ns != "" {
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Some(Ok(kube_ns.as_str()))
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} else {
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None
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}
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}
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"namespace" => match &kube_ns {
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Some(kube_ns) => Some(Ok(kube_ns)),
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None => None,
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},
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_ => None,
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})
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.parse(None)
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@ -105,43 +104,24 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
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Some(module)
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}
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None => None,
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::test::ModuleRenderer;
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use ansi_term::Color;
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use std::env;
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use std::fs::File;
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use std::io::{self, Write};
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#[test]
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fn parse_empty_config() {
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let input = "";
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let result = get_kube_context(&input);
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let expected = None;
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fn test_none_when_disabled() -> io::Result<()> {
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let dir = tempfile::tempdir()?;
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assert_eq!(result, expected);
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}
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let filename = dir.path().join("config");
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#[test]
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fn parse_no_config() {
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let input = r#"
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apiVersion: v1
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clusters: []
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contexts: []
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current-context: ""
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kind: Config
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preferences: {}
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users: []
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"#;
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let result = get_kube_context(&input);
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let expected = None;
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assert_eq!(result, expected);
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}
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#[test]
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fn parse_only_context() {
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let input = r#"
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let mut file = File::create(&filename)?;
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file.write_all(
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b"
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apiVersion: v1
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clusters: []
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contexts:
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@ -153,16 +133,108 @@ current-context: test_context
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kind: Config
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preferences: {}
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users: []
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"#;
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let result = get_kube_context(&input);
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let expected = Some(("test_context".to_string(), "".to_string()));
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",
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)?;
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file.sync_all()?;
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assert_eq!(result, expected);
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let actual = ModuleRenderer::new("kubernetes")
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.path(dir.path())
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.env("KUBECONFIG", filename.to_string_lossy().as_ref())
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.collect();
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assert_eq!(None, actual);
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dir.close()
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}
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#[test]
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fn parse_context_and_ns() {
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let input = r#"
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fn test_ctx_alias() -> io::Result<()> {
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let dir = tempfile::tempdir()?;
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let filename = dir.path().join("config");
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let mut file = File::create(&filename)?;
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file.write_all(
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b"
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apiVersion: v1
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clusters: []
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contexts: []
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current-context: test_context
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kind: Config
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preferences: {}
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users: []
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",
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)?;
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file.sync_all()?;
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let actual = ModuleRenderer::new("kubernetes")
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.path(dir.path())
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.env("KUBECONFIG", filename.to_string_lossy().as_ref())
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.config(toml::toml! {
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[kubernetes]
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disabled = false
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[kubernetes.context_aliases]
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"test_context" = "test_alias"
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})
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.collect();
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let expected = Some(format!("{} in ", Color::Cyan.bold().paint("☸ test_alias")));
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assert_eq!(expected, actual);
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dir.close()
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}
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#[test]
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fn test_single_config_file_no_ns() -> io::Result<()> {
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let dir = tempfile::tempdir()?;
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let filename = dir.path().join("config");
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let mut file = File::create(&filename)?;
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file.write_all(
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b"
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apiVersion: v1
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clusters: []
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contexts:
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- context:
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cluster: test_cluster
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user: test_user
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name: test_context
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current-context: test_context
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kind: Config
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preferences: {}
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users: []
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",
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)?;
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file.sync_all()?;
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let actual = ModuleRenderer::new("kubernetes")
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.path(dir.path())
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.env("KUBECONFIG", filename.to_string_lossy().as_ref())
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.config(toml::toml! {
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[kubernetes]
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disabled = false
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})
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.collect();
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let expected = Some(format!(
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"{} in ",
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Color::Cyan.bold().paint("☸ test_context")
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));
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assert_eq!(expected, actual);
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dir.close()
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}
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#[test]
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fn test_single_config_file_with_ns() -> io::Result<()> {
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let dir = tempfile::tempdir()?;
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let filename = dir.path().join("config");
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let mut file = File::create(&filename)?;
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file.write_all(
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b"
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apiVersion: v1
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clusters: []
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contexts:
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@ -175,16 +247,37 @@ current-context: test_context
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kind: Config
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preferences: {}
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users: []
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"#;
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let result = get_kube_context(&input);
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let expected = Some(("test_context".to_string(), "test_namespace".to_string()));
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",
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)?;
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file.sync_all()?;
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assert_eq!(result, expected);
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let actual = ModuleRenderer::new("kubernetes")
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.path(dir.path())
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.env("KUBECONFIG", filename.to_string_lossy().as_ref())
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.config(toml::toml! {
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[kubernetes]
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disabled = false
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})
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.collect();
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let expected = Some(format!(
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"{} in ",
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Color::Cyan.bold().paint("☸ test_context (test_namespace)")
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));
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assert_eq!(expected, actual);
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dir.close()
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}
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#[test]
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fn parse_multiple_contexts() {
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let input = r#"
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fn test_single_config_file_with_multiple_ctxs() -> io::Result<()> {
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let dir = tempfile::tempdir()?;
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let filename = dir.path().join("config");
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let mut file = File::create(&filename)?;
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file.write_all(
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b"
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apiVersion: v1
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clusters: []
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contexts:
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@ -202,22 +295,104 @@ current-context: test_context
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kind: Config
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preferences: {}
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users: []
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"#;
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let result = get_kube_context(&input);
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let expected = Some(("test_context".to_string(), "test_namespace".to_string()));
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",
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)?;
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file.sync_all()?;
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assert_eq!(result, expected);
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let actual = ModuleRenderer::new("kubernetes")
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.path(dir.path())
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.env("KUBECONFIG", filename.to_string_lossy().as_ref())
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.config(toml::toml! {
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[kubernetes]
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disabled = false
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})
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.collect();
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let expected = Some(format!(
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"{} in ",
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Color::Cyan.bold().paint("☸ test_context (test_namespace)")
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));
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assert_eq!(expected, actual);
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dir.close()
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}
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#[test]
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fn parse_broken_config() {
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let input = r#"
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---
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dummy_string
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"#;
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let result = get_kube_context(&input);
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let expected = None;
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fn test_multiple_config_files_with_ns() -> io::Result<()> {
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let dir = tempfile::tempdir()?;
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assert_eq!(result, expected);
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let filename_cc = dir.path().join("config_cc");
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let mut file_cc = File::create(&filename_cc)?;
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file_cc.write_all(
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b"
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apiVersion: v1
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clusters: []
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contexts: []
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current-context: test_context
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kind: Config
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preferences: {}
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users: []
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",
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)?;
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file_cc.sync_all()?;
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let filename_ctx = dir.path().join("config_ctx");
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let mut file_ctx = File::create(&filename_ctx)?;
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file_ctx.write_all(
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b"
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apiVersion: v1
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clusters: []
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contexts:
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- context:
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cluster: test_cluster
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user: test_user
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namespace: test_namespace
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name: test_context
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kind: Config
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preferences: {}
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users: []
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",
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)?;
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file_ctx.sync_all()?;
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// Test current_context first
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let actual_cc_first = ModuleRenderer::new("kubernetes")
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.path(dir.path())
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.env(
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"KUBECONFIG",
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env::join_paths([&filename_cc, &filename_ctx].iter())
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.unwrap()
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.to_string_lossy(),
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)
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.config(toml::toml! {
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[kubernetes]
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disabled = false
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})
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.collect();
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// And tes with context and namespace first
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let actual_ctx_first = ModuleRenderer::new("kubernetes")
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.path(dir.path())
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.env(
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"KUBECONFIG",
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env::join_paths([&filename_ctx, &filename_cc].iter())
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.unwrap()
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.to_string_lossy(),
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)
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.config(toml::toml! {
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[kubernetes]
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disabled = false
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})
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.collect();
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let expected = Some(format!(
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"{} in ",
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Color::Cyan.bold().paint("☸ test_context (test_namespace)")
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));
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assert_eq!(expected, actual_cc_first);
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assert_eq!(expected, actual_ctx_first);
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dir.close()
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}
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}
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