Errnos that fit: a Dump into a missing DumpDir and a shell that is not there are ENOENT, a GUI-only setting EINVAL

A Dump into a DumpDir not there failed EIO `file not found`; `no shell
"x"` read as EIO through a mount; and a GUI-only setting on a terminal,
EINVAL in the reply, had no word 9ns reads as EINVAL. Each says so in the
words that give its errno: `no such directory`, `not found`, `invalid
here`.

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

1 files changed, 8 insertions, 1 deletions

diff --git a/src/pardes.zig b/src/pardes.zig
index 35b44871..225dbf9e 100644
--- a/src/pardes.zig
+++ b/src/pardes.zig
@@ -5302,7 +5302,14 @@ pub const Pardes = struct {
     pub fn dumpFailed(p: *Pardes, path: []const u8, err: anyerror) void {
         var what: [limits.host_path_cap + 8]u8 = undefined;
         const operation = std.fmt.bufPrint(&what, "Dump {s}", .{path}) catch "Dump";
-        p.reportError(p.active, operation, err);
+        // Into a DumpDir that is not there: said so, ENOENT, as a Save is.
+        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) {
+            var said: [limits.host_path_cap + 48]u8 = undefined;
+            p.reportFailure(p.active, std.fmt.bufPrint(&said, "{s}: no such directory", .{operation}) catch "Dump: no such directory");
+        } else p.reportError(p.active, operation, err);
         // In the words the message row has, so the write's err is the one
         // record of it (its msg goes: 9p_io, dropMessage).
         const said = if (p.panes[p.active]) |pane| pane.msg[0..pane.msg_len] else "Dump failed";