A name under a directory that may not be searched or written is refused, permission denied, and a Save there says so, not no such directory

`pardes noperm/a/b/c` and `pardes /proc/1/root/x` took the missing
directory for one Save would make, opened a pane and exited 0; its Save
then said "no such directory". fs.deniedAbove finds the nearest
directory there and asks whether it may be searched and written:
forwarding refuses such a name, exit 1, "permission denied", and a
failed Save says "permission denied", which the writer's 9P error
carries as EPERM (9ns: EACCES).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/pardes.zig b/src/pardes.zig
index 945fcafa..f5001797 100644
--- a/src/pardes.zig
+++ b/src/pardes.zig
@@ -5541,7 +5541,11 @@ pub const Pardes = struct {
         const parent = std.fs.path.dirname(path) orelse "/";
         const no_dir = err == error.FileNotFound or err == error.NotDir or
             (if (comptime hosted) (if (filesystem.localPath(parent)) |local| !exec.isDirectory(local) else false) else false);
-        if (no_dir)
+        // Not there because one above refuses: that is the reason, EACCES.
+        const denied = no_dir and (if (comptime hosted) (if (filesystem.localPath(parent)) |local| filesystem.deniedAbove(local) else false) else false);
+        if (denied)
+            p.reportFailure(id, std.fmt.bufPrint(&what, "Save {s}: permission denied", .{path}) catch "Save: permission denied")
+        else if (no_dir)
             p.reportFailure(id, std.fmt.bufPrint(&what, "Save {s}: no such directory", .{path}) catch "Save: no such directory")
         else
             p.reportError(id, std.fmt.bufPrint(&what, "Save {s}", .{path}) catch "Save", err);