Remove old device ID from server in DeviceIDGen

core/configParser.go

@@ -2,6 +2,7 @@ package core
 
 import (
 	"fmt"
+	"io/fs"
 	"os"
 
 	"gopkg.in/ini.v1"
@@ -49,6 +50,18 @@ func ParseConfig(valuesRequested [][2]string, missingValueError string) []string
 	return config
 }
 
+// GenDeviceIDList returns a pointer to a slice of all registered device IDs.
+// Requires: errorOnFail (set to true to throw an error if the device ID list cannot be generated)
+func GenDeviceIDList(errorOnFail bool) *[]fs.DirEntry {
+	// create a slice of all registered devices
+	deviceIDList, err := os.ReadDir(ConfigDir + PathSeparator + "devices")
+	if err != nil && errorOnFail {
+		fmt.Println(AnsiError + "Failed to read the devices directory: " + err.Error() + AnsiReset)
+		os.Exit(101)
+	}
+	return &deviceIDList
+}
+
 // WriteConfig writes the provided key-value pairs under the specified section headers in the libmutton.ini file.
 // Requires: valuesToWrite (a slice of length 3 arrays each containing a section, a key name, and a value).
 func WriteConfig(valuesToWrite [][3]string, append bool) {

core/init.go

@@ -53,7 +53,8 @@ func GpgKeyGen() string {
 }
 
 // DirInit creates the libmutton directories.
-func DirInit(preserveOldConfigDir bool) {
+// Returns: oldDeviceID (before from before the directory reset).
+func DirInit(preserveOldConfigDir bool) string {
 	// create EntryRoot
 	err := os.MkdirAll(EntryRoot, 0700)
 	if err != nil {
@@ -61,6 +62,9 @@ func DirInit(preserveOldConfigDir bool) {
 		os.Exit(102)
 	}
 
+	// get old device ID before its potential removal
+	oldDeviceID := (*GenDeviceIDList(false))[0].Name() // errorOnFail set to false to ignore error if device ID directory does not exist (error non-critical for this function)
+
 	// remove existing config directory (if it exists and not in append mode)
 	if !preserveOldConfigDir {
 		_, isAccessible := TargetIsFile(ConfigDir, false, 1)
@@ -79,4 +83,6 @@ func DirInit(preserveOldConfigDir bool) {
 		fmt.Println(AnsiError + "Failed to create \"" + ConfigDir + "\": " + err.Error() + AnsiReset)
 		os.Exit(102)
 	}
+
+	return oldDeviceID
 }