From 810f074e75b4251b1520843b42c204e5a6e376d8 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Wed, 26 Mar 2025 22:50:54 +0100
Subject: fusefrontend: fix unconditional FileGetattrer cast

Essentially a port of
https://github.com/hanwen/go-fuse/commit/531a68551e40e7303e94b53fb3792e6dfb28d15a .

This fixes

	panic: interface conversion: *fs.dirStreamAsFile is not fs.FileGetattrer: missing method Getattr

	goroutine 20 [running]:
	github.com/rfjakob/gocryptfs/v2/internal/fusefrontend.(*Node).Getattr(0x55a7ac9d9090?, {0x55a7ac85a4d8, 0xc0013401c8}, {0x55a7ac80eb40?, 0xc0013401b0}, 0xc000586938)
		github.com/rfjakob/gocryptfs/v2/internal/fusefrontend/node.go:74 +0x22c
	github.com/hanwen/go-fuse/v2/fs.(*rawBridge).getattr(0xc0000b6180, {0x55a7ac85a4d8, 0xc0013401c8}, 0xc0010ea160, {0x55a7ac80eb40?, 0xc0013401b0}, 0xc000586938)
		github.com/hanwen/go-fuse/v2@v2.7.2/fs/bridge.go:569 +0x9b
	[...]

which is a bug exposed by a go-fuse update.

Fixes https://github.com/rfjakob/gocryptfs/issues/897
---
 internal/fusefrontend/node.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/internal/fusefrontend/node.go b/internal/fusefrontend/node.go
index 687a386..91c947e 100644
--- a/internal/fusefrontend/node.go
+++ b/internal/fusefrontend/node.go
@@ -71,7 +71,9 @@ func (n *Node) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (ch
 func (n *Node) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut) (errno syscall.Errno) {
 	// If the kernel gives us a file handle, use it.
 	if f != nil {
-		return f.(fs.FileGetattrer).Getattr(ctx, out)
+		if fga, ok := f.(fs.FileGetattrer); ok {
+			return fga.Getattr(ctx, out)
+		}
 	}
 
 	dirfd, cName, errno := n.prepareAtSyscallMyself()
-- 
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