Tty takes a directory as long as a path may be

A terminal's directory rode inline in the spawn effect, capped at 256
bytes, so Tty in a directory of about 377 bytes said path too long. A
directory past the inline buffer now goes out of line (Pardes.spawn_dirs,
given to the host when the spawn is performed), up to the host's path
limit (4095); past that, Tty says its directory is longer than a path
may be. The effect queue stays its size.

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

1 files changed, 5 insertions, 1 deletions

diff --git a/src/exec.zig b/src/exec.zig
index 73413910..c2d1be21 100644
--- a/src/exec.zig
+++ b/src/exec.zig
@@ -348,6 +348,10 @@ fn spawnTtyWithMount(p: *Pardes, from: usize, v9fs: bool) ?*Pane {
         return null;
     };
     const nt = p.newShell(free, p.execDir(from)) catch |err| {
+        if (err == error.PathTooLong) {
+            p.reportFailure(from, std.fmt.comptimePrint("Tty: its directory is longer than a path may be ({d} bytes)", .{pardes.memory.limits.host_path_cap}));
+            return null;
+        }
         p.reportError(from, "Tty", err);
         return null;
     };
@@ -663,7 +667,7 @@ fn runCommand(p: *Pardes, from: usize, line: []const u8) ?usize {
         if (panes.Terminal.onAlternateScreen(pane)) panes.Terminal.feedOutput(p, pane, "\x1b[?1049l");
         panes.Terminal.feedOutput(p, pane, "\x1b[?1000l\x1b[?1002l\x1b[?1003l\x1b[?1006l\x1b[?2004l\x1b[?25h\x1b[0m");
         echoCommand(p, pane, line);
-        p.emit(.{ .spawn = .{ .pane = @intCast(id), .serial = pane.serial, .cwd = .from(pane.cwdSlice()) } });
+        p.emitSpawn(id, pane.serial, pane.cwdSlice());
         noteRun(p, pane, "run", line);
         return id;
     }