A served-tree pane spoils no Grep, and `look .` from a gone directory is ENOENT

A pane named `/virtual` gave Grep the root `/`, which swallowed every
other pane's directory and ran out of walk before any file: every Grep
missed. Grep passes over panes of the served tree. And `.` from a pane
whose directory was gone resolved to the served tree's root (/virtual/),
or through the jump list to another pane's directory: a dot path is the
looking pane's own, and gone it fails, `look: <dir>: no such directory`.

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

1 files changed, 25 insertions, 0 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index db37fa49..d9a479fe 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -2001,6 +2001,31 @@ test "/index shows a name as the log does: a newline in it is \\n, controls spac
     try testing.expectEqual(@as(u64, index.len), call(p, .{ .tag = 1, .op = .getattr, .node = @intFromEnum(tree.TopFile.index) }).reply.attr.size);
 }
 
+test "a served-tree pane spoils no Grep, and Look . from a gone directory is ENOENT, not /virtual/" {
+    const p = try withFile(testing.allocator, "x\n");
+    defer p.deinit();
+    var tmp = testing.tmpDir(.{});
+    defer tmp.cleanup();
+    try tmp.dir.writeFile(testing.io, .{ .sub_path = "hit.txt", .data = "needle here\n" });
+    var dir_buf: [4096]u8 = undefined;
+    const dir = dir_buf[0..try tmp.dir.realPath(testing.io, &dir_buf)];
+    var line: [4200]u8 = undefined;
+    _ = wr(p, Node.of(serialOf(p), .name), try std.fmt.bufPrint(&line, "{s}/other.txt\n", .{dir}));
+    // A pane of the served tree.
+    const virtual = try th.newPane(p);
+    _ = wr(p, Node.of(virtual, .name), "/virtual/index\n");
+    // One named the served tree's root, whose directory is `/`.
+    const top = try th.newPane(p);
+    _ = wr(p, Node.of(top, .name), "/virtual\n");
+    try testing.expectEqual(Status.ok, wr(p, Node.of(serialOf(p), .exec), "Grep needle\n").reply.status);
+    // `.` from a pane whose directory is gone.
+    const gone = try th.newPane(p);
+    _ = wr(p, Node.of(gone, .name), "/tmp/pardes-no-such-dir-zz/f.txt\n");
+    const looked = wr(p, Node.of(gone, .look), ".\n");
+    try testing.expectEqual(E.NOENT, looked.errno());
+    try testing.expectStringStartsWith(looked.reply.ename, "look: /tmp/pardes-no-such-dir-zz: no such directory");
+}
+
 test "size is monotonic: growing is never refused, and a size once taken is taken again" {
     const p = try Pardes.init(testing.allocator, .{ .tty_only = true, .cols = 160, .rows = 60 });
     defer p.deinit();