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hush: fix corner cases with exec in empty expansions

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Cases like these:

var=val exec >redir

var=val `` >redir

function                                             old     new   delta
run_pipe                                            1701    1723     +22
redirect_and_varexp_helper                            56      55      -1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 22/-1)              Total: 21 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2018-04-05 14:41:21 +02:00
parent 929a41d577
commit 41d8f10813
5 changed files with 35 additions and 17 deletions
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3
shell/hush_test/hush-redir/redir_exec1.right Normal file
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@@ -0,0 +1,3 @@
First
hush: can't open '/cant/be/created': No such file or directory
One:1

2
shell/hush_test/hush-redir/redir_exec1.tests Executable file
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@@ -0,0 +1,2 @@
v=`echo First >&2` exec >/cant/be/created
echo One:$?