Tty and Shell refuse a directory: not a shell

A directory passes access(X_OK), so Tty /etc made a pane whose shell
exited 127 and Shell /etc was taken. The shell lookup now refuses a
directory, and both say "not a shell: /etc is a directory" (Tty and
Shell share one refusal, host_io.Shell.refusal). shellset's golden takes
the shared wording (re-recorded by name).

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

1 files changed, 4 insertions, 2 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index 26a18a12..dd2d9ed0 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -1428,8 +1428,10 @@ test "Shell refuses a path that is no executable, and bare it goes back to the d
     const root_ctl = @intFromEnum(tree.TopFile.ctl);
     const refused = wr(p, root_ctl, "Shell /nonexistent/zzsh\n");
     try testing.expectEqual(Status.err, refused.reply.status);
-    try testing.expect(std.mem.indexOf(u8, refused.reply.ename, "Shell: /nonexistent/zzsh: no executable by that name") != null);
-    try testing.expect(th.logHas(p, "/nonexistent/zzsh: no executable"));
+    try testing.expect(std.mem.indexOf(u8, refused.reply.ename, "Shell: no shell \"/nonexistent/zzsh\"") != null);
+    try testing.expect(th.logHas(p, "no shell \"/nonexistent/zzsh\""));
+    try testing.expectEqual(E.IO, wr(p, root_ctl, "Shell /etc\n").errno());
+    try testing.expect(th.logHas(p, "Shell: not a shell: /etc is a directory"));
     try testing.expectEqualStrings("", p.settings.shell.requested.get());
     try testing.expectEqual(Status.ok, wr(p, root_ctl, "Shell /bin/sh\n").reply.status);
     try testing.expectEqualStrings("/bin/sh", p.settings.shell.requested.get());