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From 53b13dbc8312dfa4326751f063437894c5e5a43d Mon Sep 17 00:00:00 2001
From: Ariadne Conill <ariadne@dereferenced.org>
Date: Wed, 10 Mar 2021 23:38:57 -0700
Subject: [PATCH] ash: add built-in $BB_ASH_VERSION variable
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This is helpful for detecting if the shell is busybox ash or not,
which is necessary for enabling ash-specific features in /etc/profile
and Alpine's default $ENV.
https://gitlab.alpinelinux.org/alpine/aports/-/issues/12398 outlines
the rationale for detecting what shell is running in /etc/profile and
similar.
function old new delta
.rodata 77899 77925 +26
varinit_data 360 384 +24
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 50/0) Total: 50 bytes
Signed-off-by: Ariadne Conill <ariadne@dereferenced.org>
---
shell/ash.c | 28 ++++++++++++++++++++--------
1 file changed, 20 insertions(+), 8 deletions(-)
diff --git a/shell/ash.c b/shell/ash.c
index 18ccc1329..cb38582fc 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -158,6 +158,14 @@
//config: you to run the specified command or builtin,
//config: even when there is a function with the same name.
//config:
+//config:config ASH_VERSION_VAR
+//config: bool "declare $BB_ASH_VERSION variable"
+//config: default y
+//config: depends on SHELL_ASH
+//config: help
+//config: Enable support for declaring the $BB_ASH_VERSION variable,
+//config: which is set as the busybox version.
+//config:
//config:endif # ash options
//applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
@@ -2142,6 +2150,9 @@ static const struct {
{ VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
{ VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
{ VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
+#if ENABLE_ASH_VERSION_VAR
+ { VSTRFIXED|VTEXTFIXED , "BB_ASH_VERSION=" BB_VER, NULL },
+#endif
#if ENABLE_ASH_GETOPTS
{ VSTRFIXED|VTEXTFIXED , defoptindvar, getoptsreset },
#endif
@@ -2201,19 +2212,20 @@ extern struct globals_var *BB_GLOBAL_CONST ash_ptr_to_globals_var;
#define vps1 varinit[VAR_OFFSET1 + 2]
#define vps2 varinit[VAR_OFFSET1 + 3]
#define vps4 varinit[VAR_OFFSET1 + 4]
+#define VAR_OFFSET2 (VAR_OFFSET1 + ENABLE_ASH_VERSION_VAR)
#if ENABLE_ASH_GETOPTS
-# define voptind varinit[VAR_OFFSET1 + 5]
+# define voptind varinit[VAR_OFFSET2 + 5]
#endif
-#define VAR_OFFSET2 (VAR_OFFSET1 + ENABLE_ASH_GETOPTS)
-#define vlineno varinit[VAR_OFFSET2 + 5]
-#define vfuncname varinit[VAR_OFFSET2 + 6]
+#define VAR_OFFSET3 (VAR_OFFSET2 + ENABLE_ASH_GETOPTS)
+#define vlineno varinit[VAR_OFFSET3 + 5]
+#define vfuncname varinit[VAR_OFFSET3 + 6]
#if ENABLE_ASH_RANDOM_SUPPORT
-# define vrandom varinit[VAR_OFFSET2 + 7]
+# define vrandom varinit[VAR_OFFSET3 + 7]
#endif
-#define VAR_OFFSET3 (VAR_OFFSET2 + ENABLE_ASH_RANDOM_SUPPORT)
+#define VAR_OFFSET4 (VAR_OFFSET2 + ENABLE_ASH_RANDOM_SUPPORT)
#if BASH_EPOCH_VARS
-# define vepochs varinit[VAR_OFFSET3 + 7]
-# define vepochr varinit[VAR_OFFSET3 + 8]
+# define vepochs varinit[VAR_OFFSET4 + 7]
+# define vepochr varinit[VAR_OFFSET4 + 8]
#endif
#define INIT_G_var() do { \
unsigned i; \
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