nologin: make it possible to build it as single applet

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

5 files changed, 110 insertions, 64 deletions

diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index f842e73cc..a515c3fe3 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -754,7 +754,9 @@ static void install_links(const char *busybox UNUSED_PARAM,
 }
 # endif
 
+# if ENABLE_BUSYBOX || NUM_APPLETS > 0
 static void run_applet_and_exit(const char *name, char **argv) NORETURN;
+#endif
 
 # if NUM_SCRIPTS > 0
 static int find_script_by_name(const char *name)
@@ -775,13 +777,13 @@ int scripted_main(int argc UNUSED_PARAM, char **argv)
 {
 	int script = find_script_by_name(applet_name);
 	if (script >= 0)
-#if ENABLE_ASH || ENABLE_SH_IS_ASH || ENABLE_BASH_IS_ASH
+#  if ENABLE_SHELL_ASH
 		exit(ash_main(-script - 1, argv));
-#elif ENABLE_HUSH || ENABLE_SH_IS_HUSH || ENABLE_BASH_IS_HUSH
+#  elif ENABLE_SHELL_HUSH
 		exit(hush_main(-script - 1, argv));
-#else
+#  else
 		return 1;
-#endif
+#  endif
 	return 0;
 }
 
@@ -1024,7 +1026,33 @@ static NORETURN void run_applet_and_exit(const char *name, char **argv)
 }
 # endif
 
-#endif /* !defined(SINGLE_APPLET_MAIN) */
+#else /* defined(SINGLE_APPLET_MAIN) */
+
+# if NUM_SCRIPTS > 0
+/* if SINGLE_APPLET_MAIN, these two functions are simpler: */
+int scripted_main(int argc UNUSED_PARAM, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int scripted_main(int argc UNUSED_PARAM, char **argv)
+{
+#  if ENABLE_SHELL_ASH
+	int script = 0;
+	exit(ash_main(-script - 1, argv));
+#  elif ENABLE_SHELL_HUSH
+	int script = 0;
+	exit(hush_main(-script - 1, argv));
+#  else
+	return 1;
+#  endif
+}
+char* FAST_FUNC
+get_script_content(unsigned n UNUSED_PARAM)
+{
+	char *t = unpack_bz2_data(packed_scripts, sizeof(packed_scripts),
+					UNPACKED_SCRIPTS_LENGTH);
+	return t;
+}
+# endif /* NUM_SCRIPTS > 0 */
+
+#endif /* defined(SINGLE_APPLET_MAIN) */
 
 
 #if ENABLE_BUILD_LIBBUSYBOX
diff --git a/shell/Config.src b/shell/Config.src
index d7623f774..5efbf9995 100644
--- a/shell/Config.src
+++ b/shell/Config.src
@@ -17,6 +17,7 @@ choice
 config SH_IS_ASH
 	depends on !NOMMU
 	bool "ash"
+	select SHELL_ASH
 	help
 	Choose ash to be the shell executed by 'sh' name.
 	The ash code will be built into busybox. If you don't select
@@ -25,6 +26,7 @@ config SH_IS_ASH
 
 config SH_IS_HUSH
 	bool "hush"
+	select SHELL_HUSH
 	help
 	Choose hush to be the shell executed by 'sh' name.
 	The hush code will be built into busybox. If you don't select
@@ -57,6 +59,7 @@ choice
 config BASH_IS_ASH
 	depends on !NOMMU
 	bool "ash"
+	select SHELL_ASH
 	help
 	Choose ash to be the shell executed by 'bash' name.
 	The ash code will be built into busybox. If you don't select
@@ -65,6 +68,7 @@ config BASH_IS_ASH
 
 config BASH_IS_HUSH
 	bool "hush"
+	select SHELL_HUSH
 	help
 	Choose hush to be the shell executed by 'bash' name.
 	The hush code will be built into busybox. If you don't select
@@ -81,12 +85,12 @@ INSERT
 
 
 comment "Options common to all shells"
-if ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
+if SHELL_ASH || SHELL_HUSH
 
 config FEATURE_SH_MATH
 	bool "POSIX math support"
 	default y
-	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
+	depends on SHELL_ASH || SHELL_HUSH
 	help
 	Enable math support in the shell via $((...)) syntax.
 
@@ -107,14 +111,14 @@ config FEATURE_SH_MATH_BASE
 config FEATURE_SH_EXTRA_QUIET
 	bool "Hide message on interactive shell startup"
 	default y
-	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
+	depends on SHELL_ASH || SHELL_HUSH
 	help
 	Remove the busybox introduction when starting a shell.
 
 config FEATURE_SH_STANDALONE
 	bool "Standalone shell"
 	default n
-	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
+	depends on SHELL_ASH || SHELL_HUSH
 	help
 	This option causes busybox shells to use busybox applets
 	in preference to executables in the PATH whenever possible. For
@@ -135,7 +139,7 @@ config FEATURE_SH_STANDALONE
 config FEATURE_SH_NOFORK
 	bool "Run 'nofork' applets directly"
 	default n
-	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
+	depends on SHELL_ASH || SHELL_HUSH
 	help
 	This option causes busybox shells to not execute typical
 	fork/exec/wait sequence, but call <applet>_main directly,
@@ -153,14 +157,14 @@ config FEATURE_SH_NOFORK
 config FEATURE_SH_READ_FRAC
 	bool "read -t N.NNN support (+110 bytes)"
 	default y
-	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
+	depends on SHELL_ASH || SHELL_HUSH
 	help
 	Enable support for fractional second timeout in read builtin.
 
 config FEATURE_SH_HISTFILESIZE
 	bool "Use $HISTFILESIZE"
 	default y
-	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
+	depends on SHELL_ASH || SHELL_HUSH
 	help
 	This option makes busybox shells to use $HISTFILESIZE variable
 	to set shell history size. Note that its max value is capped
@@ -169,7 +173,7 @@ config FEATURE_SH_HISTFILESIZE
 config FEATURE_SH_EMBEDDED_SCRIPTS
 	bool "Embed scripts in the binary"
 	default y
-	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
+	depends on SHELL_ASH || SHELL_HUSH
 	help
 	Allow scripts to be compressed and embedded in the busybox
 	binary. The scripts should be placed in the 'embed' directory
diff --git a/shell/ash.c b/shell/ash.c
index 2a4c839a7..ecb9b132b 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -15,10 +15,15 @@
  *
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
+//config:config SHELL_ASH
+//config:	bool #hidden option
+//config:	depends on !NOMMU
+//config:
 //config:config ASH
 //config:	bool "ash (78 kb)"
 //config:	default y
 //config:	depends on !NOMMU
+//config:	select SHELL_ASH
 //config:	help
 //config:	The most complete and most pedantically correct shell included with
 //config:	busybox. This shell is actually a derivative of the Debian 'dash'
@@ -28,17 +33,17 @@
 //config:# ash options
 //config:# note: Don't remove !NOMMU part in the next line; it would break
 //config:# menuconfig's indenting.
-//config:if !NOMMU && (ASH || SH_IS_ASH || BASH_IS_ASH)
+//config:if !NOMMU && (SHELL_ASH || ASH || SH_IS_ASH || BASH_IS_ASH)
 //config:
 //config:config ASH_OPTIMIZE_FOR_SIZE
 //config:	bool "Optimize for size instead of speed"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:
 //config:config ASH_INTERNAL_GLOB
 //config:	bool "Use internal glob() implementation"
 //config:	default y	# Y is bigger, but because of uclibc glob() bug, let Y be default for now
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:	help
 //config:	Do not use glob() function from libc, use internal implementation.
 //config:	Use this if you are getting "glob.h: No such file or directory"
@@ -49,7 +54,7 @@
 //config:config ASH_BASH_COMPAT
 //config:	bool "bash-compatible extensions"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:
 //config:config ASH_BASH_SOURCE_CURDIR
 //config:	bool "'source' and '.' builtins search current directory after $PATH"
@@ -70,17 +75,17 @@
 //config:config ASH_JOB_CONTROL
 //config:	bool "Job control"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:
 //config:config ASH_ALIAS
 //config:	bool "Alias support"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:
 //config:config ASH_RANDOM_SUPPORT
 //config:	bool "Pseudorandom generator and $RANDOM variable"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:	help
 //config:	Enable pseudorandom generator and dynamic variable "$RANDOM".
 //config:	Each read of "$RANDOM" will generate a new pseudorandom value.
@@ -91,7 +96,7 @@
 //config:config ASH_EXPAND_PRMT
 //config:	bool "Expand prompt string"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:	help
 //config:	$PS# may contain volatile content, such as backquote commands.
 //config:	This option recreates the prompt string from the environment
@@ -100,14 +105,14 @@
 //config:config ASH_IDLE_TIMEOUT
 //config:	bool "Idle timeout variable $TMOUT"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:	help
 //config:	Enable bash-like auto-logout after $TMOUT seconds of idle time.
 //config:
 //config:config ASH_MAIL
 //config:	bool "Check for new mail in interactive shell"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:	help
 //config:	Enable "check for new mail" function:
 //config:	if set, $MAIL file and $MAILPATH list of files
@@ -117,32 +122,32 @@
 //config:config ASH_ECHO
 //config:	bool "echo builtin"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:
 //config:config ASH_PRINTF
 //config:	bool "printf builtin"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:
 //config:config ASH_TEST
 //config:	bool "test builtin"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:
 //config:config ASH_HELP
 //config:	bool "help builtin"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:
 //config:config ASH_GETOPTS
 //config:	bool "getopts builtin"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:
 //config:config ASH_CMDCMD
 //config:	bool "command builtin"
 //config:	default y
-//config:	depends on ASH || SH_IS_ASH || BASH_IS_ASH
+//config:	depends on SHELL_ASH
 //config:	help
 //config:	Enable support for the 'command' builtin, which allows
 //config:	you to run the specified command or builtin,
@@ -155,9 +160,7 @@
 //applet:IF_SH_IS_ASH(  APPLET_ODDNAME(sh,   ash, BB_DIR_BIN, BB_SUID_DROP, ash))
 //applet:IF_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, ash))
 
-//kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
-//kbuild:lib-$(CONFIG_SH_IS_ASH) += ash.o ash_ptr_hack.o shell_common.o
-//kbuild:lib-$(CONFIG_BASH_IS_ASH) += ash.o ash_ptr_hack.o shell_common.o
+//kbuild:lib-$(CONFIG_SHELL_ASH) += ash.o ash_ptr_hack.o shell_common.o
 //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
 
 /*
diff --git a/shell/hush.c b/shell/hush.c
index 2cf2170ca..e9cec1cc9 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -95,6 +95,7 @@
 //config:config HUSH
 //config:	bool "hush (68 kb)"
 //config:	default y
+//config:	select SHELL_HUSH
 //config:	help
 //config:	hush is a small shell. It handles the normal flow control
 //config:	constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
@@ -106,10 +107,20 @@
 //config:	It does not handle select, aliases, tilde expansion,
 //config:	&>file and >&file redirection of stdout+stderr.
 //config:
+// This option is visible (has a description) to make it possible to select
+// a "scripted" applet (such as NOLOGIN) but avoid selecting any shells:
+//config:config SHELL_HUSH
+//config:	bool "Internal shell for embedded script support"
+//config:	default n
+//config:
+//config:# hush options
+//config:# It's only needed to get "nice" menuconfig indenting.
+//config:if SHELL_HUSH || HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:
 //config:config HUSH_BASH_COMPAT
 //config:	bool "bash-compatible extensions"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_BRACE_EXPANSION
 //config:	bool "Brace expansion"
@@ -133,7 +144,7 @@
 //config:config HUSH_INTERACTIVE
 //config:	bool "Interactive mode"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:	help
 //config:	Enable interactive mode (prompt and command editing).
 //config:	Without this, hush simply reads and executes commands
@@ -159,31 +170,31 @@
 //config:config HUSH_TICK
 //config:	bool "Support command substitution"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:	help
 //config:	Enable `command` and $(command).
 //config:
 //config:config HUSH_IF
 //config:	bool "Support if/then/elif/else/fi"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_LOOPS
 //config:	bool "Support for, while and until loops"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_CASE
 //config:	bool "Support case ... esac statement"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:	help
 //config:	Enable case ... esac statement. +400 bytes.
 //config:
 //config:config HUSH_FUNCTIONS
 //config:	bool "Support funcname() { commands; } syntax"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:	help
 //config:	Enable support for shell functions. +800 bytes.
 //config:
@@ -197,7 +208,7 @@
 //config:config HUSH_RANDOM_SUPPORT
 //config:	bool "Pseudorandom generator and $RANDOM variable"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:	help
 //config:	Enable pseudorandom generator and dynamic variable "$RANDOM".
 //config:	Each read of "$RANDOM" will generate a new pseudorandom value.
@@ -205,7 +216,7 @@
 //config:config HUSH_MODE_X
 //config:	bool "Support 'hush -x' option and 'set -x' command"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:	help
 //config:	This instructs hush to print commands before execution.
 //config:	Adds ~300 bytes.
@@ -213,27 +224,27 @@
 //config:config HUSH_ECHO
 //config:	bool "echo builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_PRINTF
 //config:	bool "printf builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_TEST
 //config:	bool "test builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_HELP
 //config:	bool "help builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_EXPORT
 //config:	bool "export builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_EXPORT_N
 //config:	bool "Support 'export -n' option"
@@ -245,83 +256,83 @@
 //config:config HUSH_READONLY
 //config:	bool "readonly builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:	help
 //config:	Enable support for read-only variables.
 //config:
 //config:config HUSH_KILL
 //config:	bool "kill builtin (supports kill %jobspec)"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_WAIT
 //config:	bool "wait builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_COMMAND
 //config:	bool "command builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_TRAP
 //config:	bool "trap builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_TYPE
 //config:	bool "type builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_TIMES
 //config:	bool "times builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_READ
 //config:	bool "read builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_SET
 //config:	bool "set builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_UNSET
 //config:	bool "unset builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_ULIMIT
 //config:	bool "ulimit builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_UMASK
 //config:	bool "umask builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_GETOPTS
 //config:	bool "getopts builtin"
 //config:	default y
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
 //config:
 //config:config HUSH_MEMLEAK
 //config:	bool "memleak builtin (debugging)"
 //config:	default n
-//config:	depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
+//config:	depends on SHELL_HUSH
+//config:
+//config:endif # hush options
 
 //applet:IF_HUSH(APPLET(hush, BB_DIR_BIN, BB_SUID_DROP))
 //                       APPLET_ODDNAME:name  main  location    suid_type     help
 //applet:IF_SH_IS_HUSH(  APPLET_ODDNAME(sh,   hush, BB_DIR_BIN, BB_SUID_DROP, hush))
 //applet:IF_BASH_IS_HUSH(APPLET_ODDNAME(bash, hush, BB_DIR_BIN, BB_SUID_DROP, hush))
 
-//kbuild:lib-$(CONFIG_HUSH) += hush.o match.o shell_common.o
-//kbuild:lib-$(CONFIG_SH_IS_HUSH) += hush.o match.o shell_common.o
-//kbuild:lib-$(CONFIG_BASH_IS_HUSH) += hush.o match.o shell_common.o
+//kbuild:lib-$(CONFIG_SHELL_HUSH) += hush.o match.o shell_common.o
 //kbuild:lib-$(CONFIG_HUSH_RANDOM_SUPPORT) += random.o
 
 /* -i (interactive) is also accepted,
diff --git a/util-linux/nologin.c b/util-linux/nologin.c
index 5e5e42305..5a8b047a5 100644
--- a/util-linux/nologin.c
+++ b/util-linux/nologin.c
@@ -7,7 +7,7 @@
 //config:
 //config:config NOLOGIN_DEPENDENCIES
 //config:	bool "Enable dependencies for nologin"
-//config:	default y
+//config:	default n  # Y default makes it harder to select single-applet test
 //config:	depends on NOLOGIN
 //config:	select CAT
 //config:	select ECHO