hush: fix handling of "cmd && &"

function                                             old     new   delta
done_pipe                                            213     231     +18

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
(cherry picked from commit 83a4967e50422867f340328d404994553e56b839)

1 files changed, 5 insertions, 1 deletions

diff --git a/shell/hush.c b/shell/hush.c
index 249728b9d..41a4653ea 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -3694,9 +3694,10 @@ static void debug_print_tree(struct pipe *pi, int lvl)
 
         pin = 0;
         while (pi) {
-                fdprintf(2, "%*spipe %d %sres_word=%s followup=%d %s\n",
+                fdprintf(2, "%*spipe %d #cmds:%d %sres_word=%s followup=%d %s\n",
                                 lvl*2, "",
                                 pin,
+                                pi->num_cmds,
                                 (IF_HAS_KEYWORDS(pi->pi_inverted ? "! " :) ""),
                                 RES[pi->res_word],
                                 pi->followup, PIPE[pi->followup]
@@ -3839,6 +3840,9 @@ static void done_pipe(struct parse_context *ctx, pipe_style type)
 #endif
                 /* Replace all pipes in ctx with one newly created */
                 ctx->list_head = ctx->pipe = pi;
+                /* for cases like "cmd && &", do not be tricked by last command
+                 * being null - the entire {...} & is NOT null! */
+                not_null = 1;
         } else {
  no_conv:
                 ctx->pipe->followup = type;