[Ingest Manager] Windows agent doesn't uninstall with a lowercase `c:…

…` drive in the path (elastic#23998)

[Ingest Manager] Windows agent doesn't uninstall with a lowercase `c:` drive in the path  (elastic#23998)

x-pack/elastic-agent/CHANGELOG.asciidoc

@@ -33,6 +33,7 @@
 - Fixed reenroll scenario {pull}23686[23686]
 - Fixed Monitoring filebeat and metricbeat not connecting to Agent over GRPC {pull}23843[23843]
 - Fixed make status readable in the log. {pull}23849[23849]
+- Windows agent doesn't uninstall with a lowercase `c:` drive in the path {pull}23998[23998]
 
 ==== New features
 

x-pack/elastic-agent/pkg/agent/install/installed.go

@@ -58,7 +58,7 @@ func RunningInstalled() bool {
 		execDir = filepath.Dir(filepath.Dir(execDir))
 		execPath = filepath.Join(execDir, execName)
 	}
-	return expected == execPath
+	return ArePathsEqual(expected, execPath)
 }
 
 // checkService only checks the status of the service.

x-pack/elastic-agent/pkg/agent/install/paths.go

@@ -28,3 +28,8 @@ const (
 exec /opt/Elastic/Agent/elastic-agent $@
 `
 )
+
+// ArePathsEqual determines whether paths are equal taking case sensitivity of os into account.
+func ArePathsEqual(expected, actual string) bool {
+	return expected == actual
+}

x-pack/elastic-agent/pkg/agent/install/paths_darwin.go

@@ -27,3 +27,8 @@ const (
 exec /Library/Elastic/Agent/elastic-agent $@
 `
 )
+
+// ArePathsEqual determines whether paths are equal taking case sensitivity of os into account.
+func ArePathsEqual(expected, actual string) bool {
+	return expected == actual
+}

x-pack/elastic-agent/pkg/agent/install/paths_test.go

@@ -0,0 +1,33 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License;
+// you may not use this file except in compliance with the Elastic License.
+
+package install
+
+import (
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestEqual(t *testing.T) {
+	isWindows := runtime.GOOS == "windows"
+	testCases := []struct {
+		Name        string
+		Expected    string
+		Actual      string
+		ShouldMatch bool
+	}{
+		{"different paths", "/var/path/a", "/var/path/b", false},
+		{"strictly same paths", "/var/path/a", "/var/path/a", true},
+		{"strictly same win paths", `C:\Program Files\Elastic\Agent`, `C:\Program Files\Elastic\Agent`, true},
+		{"case insensitive win paths", `C:\Program Files\Elastic\Agent`, `c:\Program Files\Elastic\Agent`, isWindows},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.Name, func(t *testing.T) {
+			assert.Equal(t, tc.ShouldMatch, ArePathsEqual(tc.Expected, tc.Actual))
+		})
+	}
+}

x-pack/elastic-agent/pkg/agent/install/paths_windows.go

@@ -6,6 +6,8 @@
 
 package install
 
+import "strings"
+
 const (
 	// BinaryName is the name of the installed binary.
 	BinaryName = "elastic-agent.exe"
@@ -25,3 +27,8 @@ const (
 	// ShellWrapper is the wrapper that is installed.
 	ShellWrapper = "" // no wrapper on Windows
 )
+
+// ArePathsEqual determines whether paths are equal taking case sensitivity of os into account.
+func ArePathsEqual(expected, actual string) bool {
+	return strings.EqualFold(expected, actual)
+}