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vendor/bazil.org/fuse/fs/fstestutil/checkdir.go

@@ -0,0 +1,70 @@
+package fstestutil
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+)
+
+// FileInfoCheck is a function that validates an os.FileInfo according
+// to some criteria.
+type FileInfoCheck func(fi os.FileInfo) error
+
+type checkDirError struct {
+	missing map[string]struct{}
+	extra   map[string]os.FileMode
+}
+
+func (e *checkDirError) Error() string {
+	return fmt.Sprintf("wrong directory contents: missing %v, extra %v", e.missing, e.extra)
+}
+
+// CheckDir checks the contents of the directory at path, making sure
+// every directory entry listed in want is present. If the check is
+// not nil, it must also pass.
+//
+// If want contains the impossible filename "", unexpected files are
+// checked with that. If the key is not in want, unexpected files are
+// an error.
+//
+// Missing entries, that are listed in want but not seen, are an
+// error.
+func CheckDir(path string, want map[string]FileInfoCheck) error {
+	problems := &checkDirError{
+		missing: make(map[string]struct{}, len(want)),
+		extra:   make(map[string]os.FileMode),
+	}
+	for k := range want {
+		if k == "" {
+			continue
+		}
+		problems.missing[k] = struct{}{}
+	}
+
+	fis, err := ioutil.ReadDir(path)
+	if err != nil {
+		return fmt.Errorf("cannot read directory: %v", err)
+	}
+
+	for _, fi := range fis {
+		check, ok := want[fi.Name()]
+		if !ok {
+			check, ok = want[""]
+		}
+		if !ok {
+			problems.extra[fi.Name()] = fi.Mode()
+			continue
+		}
+		delete(problems.missing, fi.Name())
+		if check != nil {
+			if err := check(fi); err != nil {
+				return fmt.Errorf("check failed: %v: %v", fi.Name(), err)
+			}
+		}
+	}
+
+	if len(problems.missing) > 0 || len(problems.extra) > 0 {
+		return problems
+	}
+	return nil
+}