hush: fix "cmd1 && cmd2 &" handling on NOMMU

function                                             old     new   delta
done_pipe                                            234     238      +4

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 13 insertions, 9 deletions

diff --git a/shell/hush.c b/shell/hush.c
index 2a734f3de..8d9292ed1 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -3378,18 +3378,15 @@ static void done_pipe(struct parse_context *ctx, pipe_style type)
         ctx->ctx_inverted = 0;
         ctx->pipe->res_word = ctx->ctx_res_w;
 #endif
-        if (type != PIPE_BG || ctx->list_head == ctx->pipe) {
- no_conv:
-                ctx->pipe->followup = type;
-        } else {
-                /* Necessary since && and || have more precedence than &:
+        if (type == PIPE_BG && ctx->list_head != ctx->pipe) {
+                /* Necessary since && and || have precedence over &:
                  * "cmd1 && cmd2 &" must spawn both cmds, not only cmd2,
                  * in a backgrounded subshell.
                  */
                 struct pipe *pi;
                 struct command *command;
 
-                /* Is this actually the case? */
+                /* Is this actually this construct, all pipes end with && or ||? */
                 pi = ctx->list_head;
                 while (pi != ctx->pipe) {
                         if (pi->followup != PIPE_AND && pi->followup != PIPE_OR)
@@ -3408,11 +3405,16 @@ static void done_pipe(struct parse_context *ctx, pipe_style type)
                         command->cmd_type = CMD_NORMAL;
                 command->group = ctx->list_head;
 #if !BB_MMU
-//TODO: is this correct?!
-                command->group_as_string = xstrdup(ctx->as_string.data);
+                command->group_as_string = xstrndup(
+                            ctx->as_string.data,
+                            ctx->as_string.length - 1 /* do not copy last char, "&" */
+                );
 #endif
                 /* Replace all pipes in ctx with one newly created */
                 ctx->list_head = ctx->pipe = pi;
+        } else {
+ no_conv:
+                ctx->pipe->followup = type;
         }
 
         /* Without this check, even just <enter> on command line generates
@@ -4855,7 +4857,9 @@ static struct pipe *parse_stream(char **pstring,
                                          * Really, ask yourself, why
                                          * "cmd && <newline>" doesn't start
                                          * cmd but waits for more input?
-                                         * No reason...)
+                                         * The only reason is that it might be
+                                         * a "cmd1 && <nl> cmd2 &" construct,
+                                         * cmd1 may need to run in BG).
                                          */
                                         struct pipe *pi = ctx.list_head;
                                         if (pi->num_cmds != 0       /* check #1 */