1 files changed, 26 insertions, 0 deletions
diff --git a/internal/errext/errext.go b/internal/errext/errext.go
new file mode 100644
index 0000000..3655ba7
--- /dev/null
+++ b/internal/errext/errext.go
@@ -0,0 +1,26 @@
+package errext
+
+import "errors"
+
+// vendored from https://github.com/sapcc/go-bits/blob/master/errext/errext.go (also licensed Apache 2.0) to prevent go.mod go bump to 1.21
+
+// As is a variant of errors.As() that leverages generics to present a nicer interface.
+//
+//	//this code:
+//	var perr os.PathError
+//	if errors.As(err, &perr) {
+//		handle(perr)
+//	}
+//	//can be rewritten as:
+//	if perr, ok := errext.As[os.PathError](err); ok {
+//		handle(perr)
+//	}
+//
+// This is sometimes more verbose (like in this example), but allows to scope
+// the specific error variable to the condition's then-branch, and also looks
+// more idiomatic to developers already familiar with type casts.
+func As[T error](err error) (T, bool) {
+	var result T
+	ok := errors.As(err, &result)
+	return result, ok
+}