filetime: support windows paths (#2118)

internal/collector/filetime/filetime.go

@@ -19,6 +19,7 @@ package filetime
 
 import (
 	"fmt"
+	"io/fs"
 	"log/slog"
 	"os"
 	"path/filepath"
@@ -139,16 +140,11 @@ func (c *Collector) Collect(ch chan<- prometheus.Metric) error {
 }
 
 func (c *Collector) collectGlobFilePath(ch chan<- prometheus.Metric, filePattern string) error {
-	basePath, pattern := doublestar.SplitPattern(filePattern)
+	basePath, pattern := doublestar.SplitPattern(filepath.ToSlash(filePattern))
 	basePathFS := os.DirFS(basePath)
 
-	matches, err := doublestar.Glob(basePathFS, pattern, doublestar.WithFilesOnly(), doublestar.WithCaseInsensitive())
-	if err != nil {
-		return fmt.Errorf("failed to glob: %w", err)
-	}
-
-	for _, match := range matches {
-		filePath := filepath.Join(basePath, match)
+	err := doublestar.GlobWalk(basePathFS, pattern, func(path string, d fs.DirEntry) error {
+		filePath := filepath.Join(basePath, path)
 
 		fileInfo, err := os.Stat(filePath)
 		if err != nil {
@@ -157,7 +153,7 @@ func (c *Collector) collectGlobFilePath(ch chan<- prometheus.Metric, filePattern
 				slog.Any("err", err),
 			)
 
-			continue
+			return nil
 		}
 
 		ch <- prometheus.MustNewConstMetric(
@@ -166,6 +162,11 @@ func (c *Collector) collectGlobFilePath(ch chan<- prometheus.Metric, filePattern
 			float64(fileInfo.ModTime().UTC().UnixMicro())/1e6,
 			filePath,
 		)
+
+		return nil
+	}, doublestar.WithFilesOnly(), doublestar.WithCaseInsensitive())
+	if err != nil {
+		return fmt.Errorf("failed to glob: %w", err)
 	}
 
 	return nil