add normalizing GetRealWd() function

daemon.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/cortesi/modd/conf"
 	"github.com/cortesi/modd/shell"
+	"github.com/cortesi/modd/utils"
 	"github.com/cortesi/modd/varcmd"
 	"github.com/cortesi/termlog"
 )
@@ -123,7 +124,7 @@ func NewDaemonPen(block conf.Block, vars map[string]string, log termlog.TermLog)
 		if block.InDir != "" {
 			indir = block.InDir
 		} else {
-			indir, err = os.Getwd()
+			indir, err = utils.GetRealWd()
 			if err != nil {
 				return nil, err
 			}

modd.go

@@ -10,6 +10,7 @@ import (
 	"github.com/cortesi/modd/conf"
 	"github.com/cortesi/modd/notify"
 	"github.com/cortesi/modd/shell"
+	"github.com/cortesi/modd/utils"
 	"github.com/cortesi/moddwatch"
 	"github.com/cortesi/termlog"
 )
@@ -108,7 +109,7 @@ func (mr *ModRunner) PrepOnly(initial bool) error {
 
 func (mr *ModRunner) runBlock(b conf.Block, mod *moddwatch.Mod, dpen *DaemonPen) {
 	if b.InDir != "" {
-		currentDir, err := os.Getwd()
+		currentDir, err := utils.GetRealWd()
 		if err != nil {
 			mr.Log.Shout("Error getting current working directory: %s", err)
 			return
@@ -184,14 +185,14 @@ func (mr *ModRunner) runOnChan(modchan chan *moddwatch.Mod, readyCallback func()
 		ipatts = append(ipatts, filepath.Dir(mr.ConfPath))
 	}
 
-	currentDir, err := os.Getwd()
+	currentDir, err := utils.GetRealWd()
 	if err != nil {
 		return err
 	}
+
 	// FIXME: This takes a long time. We could start it in parallel with the
 	// first process run in a goroutine
 	watcher, err := moddwatch.Watch(currentDir, ipatts, []string{}, lullTime, modchan)
-
 	if err != nil {
 		return fmt.Errorf("Error watching: %s", err)
 	}

utils/utils.go

@@ -2,6 +2,8 @@ package utils
 
 import (
 	"os"
+	"path/filepath"
+	"strings"
 	"testing"
 )
 
@@ -34,3 +36,56 @@ func WithTempDir(t *testing.T) func() {
 		}
 	}
 }
+
+// GetRealWd returns the current working directory with the path
+// segments changed to the actual case on disk. Sticks to the
+// logic of os.Getwd, without resolving symlinks.
+func GetRealWd() (string, error) {
+	indir, err := os.Getwd()
+	if err != nil {
+		return "", err
+	}
+
+	// Initial stat to check if the os considers the file to exist.
+	// INFO: If we pass this point, the os considers this a path to an existing
+	// file. If we now find case discrepancies, we can assume that the
+	// filesystem is case-insensitive.
+	_, err = os.Stat(indir)
+	if err != nil {
+		return "", err
+	}
+
+	sepString := string(filepath.Separator)
+	prefix := filepath.VolumeName(indir) // empty on unix
+	relativePath := indir[len(prefix)+len(sepString):]
+
+	// Split the relative path into segments
+	segments := strings.Split(relativePath, sepString)
+	realPath := prefix + sepString
+
+	// Validate each segment
+Seg:
+	for _, segment := range segments {
+		currentPath := filepath.Join(realPath, segment)
+		parentDir := filepath.Dir(currentPath)
+		if parentDir == "." {
+			parentDir = ""
+		}
+
+		entries, err := os.ReadDir(parentDir)
+		if err != nil {
+			return "", err
+		}
+
+		for _, entry := range entries {
+			if strings.EqualFold(entry.Name(), segment) {
+				realPath = filepath.Join(realPath, entry.Name())
+				continue Seg
+			}
+		}
+
+		return "", os.ErrNotExist
+	}
+
+	return realPath, nil
+}