ash: restore special variables when replaced by local

Commit 3194a475d (ash: export certain variables to the environment
immediately) caused the special variables BB_OVERRIDE_APPLETS,
BB_SKIP_ANSI_EMULATION and BB_SYSTEMROOT to be exported to the
environment.

If one of these variables is replaced by a local variable its
previous value should be re-exported on leaving the local context
(function or simple command).

(GitHub issue #256)

1 files changed, 4 insertions, 0 deletions

diff --git a/shell/ash.c b/shell/ash.c
index b3d8feb0b..ab2b0628f 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -10735,6 +10735,10 @@ poplocalvars(int keep)
                                 free((char*)vp->var_text);
                         vp->flags = lvp->flags;
                         vp->var_text = lvp->text;
+#if ENABLE_PLATFORM_MINGW32
+                        if (is_bb_var(lvp->text) == BB_VAR_ASSIGN)
+                                putenv(lvp->text);
+#endif
                 }
                 free(lvp);
         }