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nologin: make it possible to build it as single applet

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2020-06-24 13:39:13 +02:00
parent d5314e7129
commit 67e1529b92
5 changed files with 110 additions and 64 deletions
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34
libbb/appletlib.c
View File

@ -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)
@ -775,9 +777,9 @@ 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
return 1;
@ -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

20
shell/Config.src
View File

@ -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

41
shell/ash.c
View File

@ -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
/*

73
shell/hush.c
View File

@ -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,

2
util-linux/nologin.c
View File

@ -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