ash: changes to login shell functionality

Upstream BusyBox supports the usual Unix functionality where the
login process adds a '-' prefix to the shell's argv[0].  Since
busybox-w32 doesn't have a login process this serves no purpose
and can be removed.

Instead it would be useful to have a way to invoke a login shell
without requiring any arguments.  Advantages would be:

- easier to configure busybox-w32 'ash' as the SSH login shell;

- double clicking on a shell binary could start a login shell.

Add 'lash' as an alias for 'ash' which starts a login shell without
requiring the '-l' option.

Saves 16 bytes.

2 files changed, 9 insertions, 1 deletions

diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index bf9ae4603..6b610743a 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -1379,9 +1379,10 @@ int main(int argc UNUSED_PARAM, char **argv)
                 argv++;
 # endif
         applet_name = argv[0];
+# if !ENABLE_PLATFORM_MINGW32
         if (applet_name[0] == '-')
                 applet_name++;
-# if ENABLE_PLATFORM_MINGW32
+# else
         str_tolower(argv[0]);
         bs_to_slash(argv[0]);
         if (has_exe_suffix_or_dot(argv[0])) {
diff --git a/shell/ash.c b/shell/ash.c
index 2ea87a049..95f399b0b 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -209,6 +209,9 @@
 //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
 //                      APPLET_ODDNAME:name  main location    suid_type     help
 //applet:IF_SH_IS_ASH(  APPLET_ODDNAME(sh,   ash, BB_DIR_BIN, BB_SUID_DROP, ash))
+//applet:IF_PLATFORM_MINGW32(
+//applet:IF_SH_IS_ASH(  APPLET_ODDNAME(lash, ash, BB_DIR_BIN, BB_SUID_DROP, ash))
+//applet:)
 //applet:IF_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, ash))
 
 //kbuild:lib-$(CONFIG_SHELL_ASH) += ash.o ash_ptr_hack.o shell_common.o
@@ -15999,7 +16002,11 @@ procargs(char **argv)
         int login_sh;
 
         xargv = argv;
+#if ENABLE_PLATFORM_MINGW32
+        login_sh = applet_name[0] == 'l';
+#else
         login_sh = xargv[0] && xargv[0][0] == '-';
+#endif
 #if NUM_SCRIPTS > 0
         if (minusc)
                 goto setarg0;