feat: switch config file to XDG conform location

The config file is now located in an folder according to the XDG
specification (`XDG_CONFIG_HOME`).

Since this is a breaking change, there is a check in place, which
informs the end user to please migrate to the new config location, if
the a file at the old config path has been located.

This fixes k8sgpt-ai#235.

Signed-off-by: Patrick Pichler <git@patrickpichler.dev>

README.md

@@ -34,7 +34,7 @@ brew install k8sgpt
   <!---x-release-please-end-->
 
   **64 bit:**
- 
+
   <!---x-release-please-start-version-->
   ```
   curl -LO https://github.com/k8sgpt-ai/k8sgpt/releases/download/v0.2.0/k8sgpt_amd64.rpm
@@ -54,7 +54,7 @@ brew install k8sgpt
   ```
   <!---x-release-please-end-->
   **64 bit:**
- 
+
   <!---x-release-please-start-version-->
   ```
   curl -LO https://github.com/k8sgpt-ai/k8sgpt/releases/download/v0.2.0/k8sgpt_amd64.deb
@@ -88,7 +88,7 @@ brew install k8sgpt
   When installing Homebrew on WSL or Linux, you may encounter the following error:
 
   ```
-  ==> Installing k8sgpt from k8sgpt-ai/k8sgpt Error: The following formula cannot be installed from a bottle and must be 
+  ==> Installing k8sgpt from k8sgpt-ai/k8sgpt Error: The following formula cannot be installed from a bottle and must be
   built from the source. k8sgpt Install Clang or run brew install gcc.
   ```
 
@@ -102,7 +102,7 @@ If you install gcc as suggested, the problem will persist. Therefore, you need t
 
 ## Windows
 
-* Download the latest Windows binaries of **k8sgpt** from the [Release](https://github.com/k8sgpt-ai/k8sgpt/releases) 
+* Download the latest Windows binaries of **k8sgpt** from the [Release](https://github.com/k8sgpt-ai/k8sgpt/releases)
   tab based on your system architecture.
 * Extract the downloaded package to your desired location. Configure the system *path* variable with the binary location
 
@@ -117,7 +117,7 @@ If you install gcc as suggested, the problem will persist. Therefore, you need t
 
 * Currently the default AI provider is OpenAI, you will need to generate an API key from [OpenAI](https://openai.com)
   * You can do this by running `k8sgpt generate` to open a browser link to generate it
-* Run `k8sgpt auth` to set it in k8sgpt. 
+* Run `k8sgpt auth` to set it in k8sgpt.
   * You can provide the password directly using the `--password` flag.
 * Run `k8sgpt filters` to manage the active filters used by the analyzer. By default, all filters are executed during analysis.
 * Run `k8sgpt analyze` to run a scan.
@@ -127,7 +127,7 @@ If you install gcc as suggested, the problem will persist. Therefore, you need t
 
 ## Analyzers
 
-K8sGPT uses analyzers to triage and diagnose issues in your cluster. It has a set of analyzers that are built in, but 
+K8sGPT uses analyzers to triage and diagnose issues in your cluster. It has a set of analyzers that are built in, but
 you will be able to write your own analyzers.
 
 ### Built in analyzers
@@ -235,17 +235,25 @@ k8sgpt analyze --explain --filter=Service --output=json
 
 ## What about kubectl-ai?
 
-The kubectl-ai [project](https://github.com/sozercan/kubectl-ai) uses AI to create manifests and apply them to the 
+The kubectl-ai [project](https://github.com/sozercan/kubectl-ai) uses AI to create manifests and apply them to the
 cluster. It is not what we are trying to do here, it is focusing on writing YAML manifests.
 
-K8sgpt is focused on triaging and diagnosing issues in your cluster. It is a tool for SRE, Platform & DevOps engineers 
-to help them understand what is going on in their cluster. Cutting through the noise of logs and multiple tools to find 
+K8sgpt is focused on triaging and diagnosing issues in your cluster. It is a tool for SRE, Platform & DevOps engineers
+to help them understand what is going on in their cluster. Cutting through the noise of logs and multiple tools to find
 the root cause of an issue.
 
 
 ## Configuration
 
-`k8sgpt` stores config data in `~/.k8sgpt.yaml` the data is stored in plain text, including your OpenAI key.
+`k8sgpt` stores config data in the `$XDG_CONFIG_HOME/k8sgpt/k8sgpt.yaml` file. The data is stored in plain text, including your OpenAI key.
+
+Config file locations:
+| OS      | Path                                             |
+|---------|--------------------------------------------------|
+| MacOS   | ~/Library/Application Support/k8sgpt/k8sgpt.yaml |
+| Linux   | ~/.config/k8sgpt/k8sgpt.yaml                     |
+| Windows | %LOCALAPPDATA%/k8sgpt/k8sgpt.yaml                |
+
 
 ## Contributing
 

cmd/root.go

@@ -1,13 +1,16 @@
 package cmd
 
 import (
+	"errors"
+	"fmt"
 	"os"
 	"path/filepath"
 
 	"github.com/k8sgpt-ai/k8sgpt/cmd/filters"
 	"github.com/k8sgpt-ai/k8sgpt/cmd/generate"
 	"k8s.io/client-go/util/homedir"
 
+	"github.com/adrg/xdg"
 	"github.com/fatih/color"
 	"github.com/k8sgpt-ai/k8sgpt/cmd/analyze"
 	"github.com/k8sgpt-ai/k8sgpt/cmd/auth"
@@ -44,6 +47,8 @@ func Execute(v string) {
 }
 
 func init() {
+	checkForOldConfig()
+
 	cobra.OnInitialize(initConfig)
 
 	var kubeconfigPath string
@@ -54,13 +59,12 @@ func init() {
 	rootCmd.AddCommand(analyze.AnalyzeCmd)
 	rootCmd.AddCommand(filters.FiltersCmd)
 	rootCmd.AddCommand(generate.GenerateCmd)
-	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.k8sgpt.yaml)")
+	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", fmt.Sprintf("config file (default is %s)", getConfigFilePath()))
 	rootCmd.PersistentFlags().StringVar(&kubecontext, "kubecontext", "", "Kubernetes context to use. Only required if out-of-cluster.")
 	rootCmd.PersistentFlags().StringVar(&kubeconfig, "kubeconfig", kubeconfigPath, "Path to a kubeconfig. Only required if out-of-cluster.")
 	// Cobra also supports local flags, which will only run
 	// when this action is called directly.
 	// rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
-
 }
 
 // initConfig reads in config file and ENV variables if set.
@@ -69,14 +73,14 @@ func initConfig() {
 		// Use config file from the flag.
 		viper.SetConfigFile(cfgFile)
 	} else {
-		// Find home directory.
-		home, err := os.UserHomeDir()
-		cobra.CheckErr(err)
+		// the config will belocated under `~/.config/k8sgpt/k8sgpt.yaml` on linux
+		configDir := filepath.Join(xdg.ConfigHome, "k8sgpt")
+
+		ensureDirExists(configDir)
 
-		// Search config in home directory with name ".k8sgpt.git" (without extension).
-		viper.AddConfigPath(home)
+		viper.AddConfigPath(configDir)
 		viper.SetConfigType("yaml")
-		viper.SetConfigName(".k8sgpt")
+		viper.SetConfigName("k8sgpt")
 
 		viper.SafeWriteConfig()
 	}
@@ -97,3 +101,37 @@ func initConfig() {
 		//	fmt.Fprintln(os.Stderr, "Using config file:", viper.ConfigFileUsed())
 	}
 }
+
+func getConfigFilePath() string {
+	return filepath.Join(xdg.ConfigHome, "k8sgpt", "k8sgpt.yaml")
+}
+
+func ensureDirExists(dir string) {
+	err := os.Mkdir(dir, 0755)
+
+	if errors.Is(err, os.ErrExist) {
+		return
+	}
+}
+
+// tests if a file exists in the legacy config path and warns the user about it
+func checkForOldConfig() {
+	home, err := os.UserHomeDir()
+
+	// ignoring the error here, as we do not want to exit here even on error
+	if err != nil {
+		return
+	}
+
+	oldConfig := filepath.Join(home, ".k8sgpt.yaml")
+
+	if _, err := os.Stat(oldConfig); err == nil {
+		fmt.Fprintln(os.Stderr, color.RedString("Warning: Legacy config file at `%s` detected!", oldConfig))
+		fmt.Fprintln(os.Stderr, color.RedString("Please migrate to new config file location `%s`", getConfigFilePath()))
+	} else if errors.Is(err, os.ErrNotExist) {
+		// old config file is not existing, exactly what we want
+		return
+	} else {
+		fmt.Fprintln(os.Stderr, color.RedString("error while checking for existance of old config file: %s\n", err))
+	}
+}

go.mod

@@ -17,6 +17,7 @@ require (
 )
 
 require (
+	github.com/adrg/xdg v0.4.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/emicklei/go-restful/v3 v3.10.2 // indirect
 	github.com/evanphx/json-patch v4.12.0+incompatible // indirect

go.sum

@@ -39,6 +39,8 @@ dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/adrg/xdg v0.4.0 h1:RzRqFcjH4nE5C6oTAxhBtoE2IRyjBSa62SCbyPidvls=
+github.com/adrg/xdg v0.4.0/go.mod h1:N6ag73EX4wyxeaoeHctc1mas01KZgsj5tYiAIwqJE/E=
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/buger/jsonparser v1.1.1/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
@@ -407,6 +409,7 @@ golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220908164124-27713097b956/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=