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List: busybox
Subject: [PATCH] Treat custom and applet scripts as applets
From: Ron Yorston <rmy () pobox ! com>
Date: 2018-11-17 17:48:14
Message-ID: 5bf0545e.1Ygu4OuGdi0trcNh%rmy () pobox ! com
[Download RAW message or body]
BusyBox has support for embedded shell scripts. Two types can be
distinguished: custom scripts and scripts implementing applets.
Custom scripts should be placed in the 'embed' directory at build
time. They are given a default applet configuration and appear
as applets to the user but no further configuration is possible.
Applet scripts are integrated with the BusyBox build system and
are intended to be used to ship standard applets that just happen
to be implemented as scripts. They can be configured at build time
and appear just like native applets.
Such scripts should be placed in the 'applets_sh' directory. A stub
C program should be written to provide the usual applet configuration
details and placed in a suitable subsystem directory. It may be
helpful to have a configuration option to enable any dependencies the
script requires: see the 'nologin' applet for an example.
function old new delta
scripted_main - 53 +53
packed_usage 32951 32997 +46
.rodata 168610 168655 +45
applet_names 2695 2703 +8
applet_main 3128 3136 +8
script_names 9 - -9
find_script_by_name 57 26 -31
run_applet_and_exit 782 728 -54
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 4/2 up/down: 160/-94) Total: 66 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
---
.gitignore | 5 ++
Makefile | 4 +-
applets/busybox.mkscripts | 16 +++++
{embed => applets_sh}/nologin | 0
include/applets.src.h | 21 +++++++
include/libbb.h | 1 +
libbb/appletlib.c | 69 ++++++++++------------
libbb/lineedit.c | 20 ++-----
scripts/embedded_scripts | 107 ++++++++++++++++++++++++++--------
scripts/gen_build_files.sh | 21 ++++++-
shell/ash.c | 19 ++----
util-linux/nologin.c | 27 +++++++++
12 files changed, 213 insertions(+), 97 deletions(-)
create mode 100755 applets/busybox.mkscripts
rename {embed => applets_sh}/nologin (100%)
create mode 100644 util-linux/nologin.c
diff --git a/.gitignore b/.gitignore
index c03c2e8a6..becd9bf6d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,3 +56,8 @@ cscope.po.out
#
tags
TAGS
+
+#
+# user-supplied scripts
+#
+/embed
diff --git a/Makefile b/Makefile
index 8a0dbdf49..c19280476 100644
--- a/Makefile
+++ b/Makefile
@@ -361,7 +361,7 @@ scripts/basic/%: scripts_basic ;
# This target generates Kbuild's and Config.in's from *.c files
PHONY += gen_build_files
-gen_build_files: $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c)
+gen_build_files: $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c) \
$(wildcard embed/*) $(Q)$(srctree)/scripts/gen_build_files.sh $(srctree) $(objtree)
# bbox: we have helpers in applets/
@@ -851,7 +851,7 @@ quiet_cmd_gen_common_bufsiz = GEN include/common_bufsiz.h
quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/*
cmd_split_autoconf = scripts/basic/split-include include/autoconf.h \
include/config quiet_cmd_gen_embedded_scripts = GEN include/embedded_scripts.h
- cmd_gen_embedded_scripts = scripts/embedded_scripts include/embedded_scripts.h \
embed + cmd_gen_embedded_scripts = $(srctree)/scripts/embedded_scripts \
include/embedded_scripts.h $(srctree)/embed $(srctree)/applets_sh #bbox# piggybacked \
generation of few .h files include/config/MARKER: scripts/basic/split-include \
include/autoconf.h $(wildcard embed/*) scripts/embedded_scripts $(call \
cmd,split_autoconf)
diff --git a/applets/busybox.mkscripts b/applets/busybox.mkscripts
new file mode 100755
index 000000000..935685cba
--- /dev/null
+++ b/applets/busybox.mkscripts
@@ -0,0 +1,16 @@
+#!/bin/sh
+# Make busybox scripted applet list file.
+
+# input $1: full path to Config.h
+# input $2: full path to applets.h
+# output (stdout): list of pathnames that should be linked to busybox
+
+export LC_ALL=POSIX
+export LC_CTYPE=POSIX
+
+CONFIG_H=${1:-include/autoconf.h}
+APPLETS_H=${2:-include/applets.h}
+$HOSTCC -E -DMAKE_SCRIPTS -include $CONFIG_H $APPLETS_H |
+ awk '/^[ \t]*SCRIPT/{
+ print $2
+ }'
diff --git a/embed/nologin b/applets_sh/nologin
similarity index 100%
rename from embed/nologin
rename to applets_sh/nologin
diff --git a/include/applets.src.h b/include/applets.src.h
index 2ddf120ad..a9db5d160 100644
--- a/include/applets.src.h
+++ b/include/applets.src.h
@@ -22,41 +22,60 @@ s - suid type:
BB_SUID_REQUIRE or BB_SUID_MAYBE applet.
*/
+#define NOUSAGE_STR "\b"
+
+#define dummy_trivial_usage NOUSAGE_STR \
+
+#define dummy_full_usage "" \
+
#if defined(PROTOTYPES)
# define APPLET(name,l,s) int name##_main(int argc, char **argv) \
MAIN_EXTERNALLY_VISIBLE; # define APPLET_ODDNAME(name,main,l,s,help) int \
main##_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; # define \
APPLET_NOEXEC(name,main,l,s,help) int main##_main(int argc, char **argv) \
MAIN_EXTERNALLY_VISIBLE; # define APPLET_NOFORK(name,main,l,s,help) int \
main##_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +# define \
APPLET_SCRIPTED(name,main,l,s,help)
#elif defined(NAME_MAIN)
# define APPLET(name,l,s) name name##_main
# define APPLET_ODDNAME(name,main,l,s,help) name main##_main
# define APPLET_NOEXEC(name,main,l,s,help) name main##_main
# define APPLET_NOFORK(name,main,l,s,help) name main##_main
+# define APPLET_SCRIPTED(name,main,l,s,help) name scripted_main
#elif defined(MAKE_USAGE) && ENABLE_FEATURE_VERBOSE_USAGE
# define APPLET(name,l,s) MAKE_USAGE(#name, name##_trivial_usage \
name##_full_usage) # define APPLET_ODDNAME(name,main,l,s,help) MAKE_USAGE(#name, \
help##_trivial_usage help##_full_usage) # define APPLET_NOEXEC(name,main,l,s,help) \
MAKE_USAGE(#name, help##_trivial_usage help##_full_usage) # define \
APPLET_NOFORK(name,main,l,s,help) MAKE_USAGE(#name, help##_trivial_usage \
help##_full_usage) +# define APPLET_SCRIPTED(name,main,l,s,help) MAKE_USAGE(#name, \
help##_trivial_usage help##_full_usage)
#elif defined(MAKE_USAGE) && !ENABLE_FEATURE_VERBOSE_USAGE
# define APPLET(name,l,s) MAKE_USAGE(#name, name##_trivial_usage)
# define APPLET_ODDNAME(name,main,l,s,help) MAKE_USAGE(#name, help##_trivial_usage)
# define APPLET_NOEXEC(name,main,l,s,help) MAKE_USAGE(#name, help##_trivial_usage)
# define APPLET_NOFORK(name,main,l,s,help) MAKE_USAGE(#name, help##_trivial_usage)
+# define APPLET_SCRIPTED(name,main,l,s,help) MAKE_USAGE(#name, help##_trivial_usage)
#elif defined(MAKE_LINKS)
# define APPLET(name,l,c) LINK l name
# define APPLET_ODDNAME(name,main,l,s,help) LINK l name
# define APPLET_NOEXEC(name,main,l,s,help) LINK l name
# define APPLET_NOFORK(name,main,l,s,help) LINK l name
+# define APPLET_SCRIPTED(name,main,l,s,help) LINK l name
#elif defined(MAKE_SUID)
# define APPLET(name,l,s) SUID s l name
# define APPLET_ODDNAME(name,main,l,s,help) SUID s l name
# define APPLET_NOEXEC(name,main,l,s,help) SUID s l name
# define APPLET_NOFORK(name,main,l,s,help) SUID s l name
+# define APPLET_SCRIPTED(name,main,l,s,help) SUID s l name
+
+#elif defined(MAKE_SCRIPTS)
+# define APPLET(name,l,s)
+# define APPLET_ODDNAME(name,main,l,s,help)
+# define APPLET_NOEXEC(name,main,l,s,help)
+# define APPLET_NOFORK(name,main,l,s,help)
+# define APPLET_SCRIPTED(name,main,l,s,help) SCRIPT name
#else
static struct bb_applet applets[] = { /* name, main, location, need_suid */
@@ -64,6 +83,7 @@ s - suid type:
# define APPLET_ODDNAME(name,main,l,s,help) { #name, #main, l, s },
# define APPLET_NOEXEC(name,main,l,s,help) { #name, #main, l, s, 1 },
# define APPLET_NOFORK(name,main,l,s,help) { #name, #main, l, s, 1, 1 },
+# define APPLET_SCRIPTED(name,main,l,s,help) { #name, #main, l, s },
#endif
#if ENABLE_INSTALL_NO_USR
@@ -84,3 +104,4 @@ INSERT
#undef APPLET_ODDNAME
#undef APPLET_NOEXEC
#undef APPLET_NOFORK
+#undef APPLET_SCRIPTED
diff --git a/include/libbb.h b/include/libbb.h
index a32608ebd..3fcff421b 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1324,6 +1324,7 @@ void bb_logenv_override(void) FAST_FUNC;
/* Embedded script support */
int find_script_by_name(const char *name) FAST_FUNC;
char *get_script_content(unsigned n) FAST_FUNC;
+int scripted_main(int argc UNUSED_PARAM, char** argv) FAST_FUNC;
/* Applets which are useful from another applets */
int bb_cat(char** argv) FAST_FUNC;
diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index 6dfaf1f41..5e7114198 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -51,7 +51,7 @@
#include "usage_compressed.h"
#if ENABLE_ASH_EMBEDDED_SCRIPTS
-# define DEFINE_script_names 1
+# define DEFINE_SCRIPT_DATA 1
# include "embedded_scripts.h"
#else
# define NUM_SCRIPTS 0
@@ -754,6 +754,14 @@ static void install_links(const char *busybox UNUSED_PARAM,
}
# endif
+int FAST_FUNC scripted_main(int argc UNUSED_PARAM, char **argv)
+{
+ int script = find_script_by_name(applet_name);
+ if (script >= 0)
+ exit(ash_main(-script - 1, argv));
+ return 0;
+}
+
static void run_applet_and_exit(const char *name, char **argv) NORETURN;
# if ENABLE_BUSYBOX
@@ -818,27 +826,21 @@ int busybox_main(int argc UNUSED_PARAM, char **argv)
/* prevent last comma to be in the very last pos */
output_width--;
a = applet_names;
- {
-# if NUM_SCRIPTS > 0
- int i;
- for (i = 0; i < 2; i++, a = script_names)
-# endif
- while (*a) {
- int len2 = strlen(a) + 2;
- if (col >= (int)output_width - len2) {
- full_write2_str(",\n");
- col = 0;
- }
- if (col == 0) {
- col = 6;
- full_write2_str("\t");
- } else {
- full_write2_str(", ");
- }
- full_write2_str(a);
- col += len2;
- a += len2 - 1;
+ while (*a) {
+ int len2 = strlen(a) + 2;
+ if (col >= (int)output_width - len2) {
+ full_write2_str(",\n");
+ col = 0;
+ }
+ if (col == 0) {
+ col = 6;
+ full_write2_str("\t");
+ } else {
+ full_write2_str(", ");
}
+ full_write2_str(a);
+ col += len2;
+ a += len2 - 1;
}
full_write2_str("\n");
return 0;
@@ -949,17 +951,15 @@ void FAST_FUNC run_applet_no_and_exit(int applet_no, const char \
*name, char **ar int FAST_FUNC
find_script_by_name(const char *name)
{
- const char *s = script_names;
- int i = 0;
+ int i;
+ int applet = find_applet_by_name(name);
- while (*s) {
- if (strcmp(name, s) == 0)
- return i;
- i++;
- while (*s++ != '\0')
- continue;
+ if (applet >= 0) {
+ for (i=0; i<NUM_SCRIPTS; ++i)
+ if (applet_numbers[i] == applet)
+ return i;
}
- return -0x10000; /* make it so that NUM_APPLETS + <error> is still < 0 */
+ return -1;
}
char* FAST_FUNC
@@ -978,7 +978,7 @@ get_script_content(unsigned n)
}
# endif /* NUM_SCRIPTS > 0 */
-# if ENABLE_BUSYBOX || NUM_APPLETS > 0 || NUM_SCRIPTS > 0
+# if ENABLE_BUSYBOX || NUM_APPLETS > 0
static NORETURN void run_applet_and_exit(const char *name, char **argv)
{
# if ENABLE_BUSYBOX
@@ -993,13 +993,6 @@ static NORETURN void run_applet_and_exit(const char *name, char \
**argv) run_applet_no_and_exit(applet, name, argv);
}
# endif
-# if NUM_SCRIPTS > 0
- {
- int script = find_script_by_name(name);
- if (script >= 0)
- exit(ash_main(-script - 1, argv));
- }
-# endif
/*bb_error_msg_and_die("applet not found"); - links in printf */
full_write2_str(applet_name);
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 618e7c221..b1e971f88 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -41,12 +41,6 @@
#include "busybox.h"
#include "NUM_APPLETS.h"
#include "unicode.h"
-#if ENABLE_ASH_EMBEDDED_SCRIPTS
-# include "embedded_scripts.h"
-#else
-# define NUM_SCRIPTS 0
-#endif
-
#ifndef _POSIX_VDISABLE
# define _POSIX_VDISABLE '\0'
#endif
@@ -812,20 +806,14 @@ static NOINLINE unsigned complete_cmd_dir_file(const char \
*command, int type) }
pf_len = strlen(pfind);
-# if ENABLE_FEATURE_SH_STANDALONE && (NUM_APPLETS != 1 || NUM_SCRIPTS > 0)
+# if ENABLE_FEATURE_SH_STANDALONE && NUM_APPLETS != 1
if (type == FIND_EXE_ONLY && !dirbuf) {
- const char *p;
-# if NUM_APPLETS != 1 && NUM_SCRIPTS > 0
- for (i = 0, p = applet_names; i < 2; i++, p = script_names)
-# elif NUM_APPLETS != 1 /* and NUM_SCRIPTS == 0 */
- p = applet_names;
-# else /* NUM_APPLETS == 1 && NUM_SCRIPTS > 0 */
- p = script_names;
-# endif
+ const char *p = applet_names;
+
while (*p) {
if (strncmp(pfind, p, pf_len) == 0)
add_match(xstrdup(p));
- while (*p++)
+ while (*p++ != '\0')
continue;
}
}
diff --git a/scripts/embedded_scripts b/scripts/embedded_scripts
index 7245ba6e0..b7a023ce0 100755
--- a/scripts/embedded_scripts
+++ b/scripts/embedded_scripts
@@ -1,7 +1,8 @@
#!/bin/sh
target="$1"
-loc="$2"
+custom_loc="$2"
+applet_loc="$3"
test "$target" || exit 1
test "$SED" || SED=sed
@@ -14,46 +15,102 @@ if test $? != 0; then
exit 1
fi
-exec >"$target.$$"
-
-scripts=""
-if [ -d "$loc" ]
+custom_scripts=""
+if [ -d "$custom_loc" ]
then
- scripts=$(cd $loc; ls * 2>/dev/null)
+ custom_scripts=$(cd $custom_loc; ls * 2>/dev/null)
fi
+all_scripts=$(applets/busybox.mkscripts)
+
+# all_scripts includes applet scripts and custom scripts, sort them out
+applet_scripts=""
+for i in $all_scripts
+do
+ found=0
+ for j in $custom_scripts
+ do
+ if [ "$i" = "$j" ]
+ then
+ found=1
+ break;
+ fi
+ done
+ if [ $found -eq 0 ]
+ then
+ # anything that isn't a custom script is an applet script
+ applet_scripts="$applet_scripts $i"
+ fi
+done
-n=$(echo $scripts | wc -w)
+# we know the custom scripts are present but applet scripts might have
+# become detached from their configuration
+for i in $applet_scripts
+do
+ #if [ ! -f "$applet_loc/$i" -a ! -f "$custom_loc/$i" ]
+ if [ ! -f "$applet_loc/$i" ]
+ then
+ echo "missing applet script $i"
+ exit 1
+ fi
+done
-if [ $n -ne 0 ]
+n=$(echo $custom_scripts $applet_scripts | wc -w)
+nall=$(echo $all_scripts | wc -w)
+
+if [ $n -ne $nall ]
then
- printf '#ifdef DEFINE_script_names\n'
- printf 'const char script_names[] ALIGN1 = '
- for i in $scripts
+ echo "script mismatch $n != $nall"
+ exit 1
+fi
+
+concatenate_scripts() {
+ for i in $custom_scripts
+ do
+ cat $custom_loc/$i
+ printf '\000'
+ done
+ for i in $applet_scripts
do
- printf '"%s\\0"' $i
+ cat $applet_loc/$i
+ printf '\000'
done
- printf ';\n'
+}
+
+exec >"$target.$$"
+
+if [ $n -ne 0 ]
+then
+ printf '#ifdef DEFINE_SCRIPT_DATA\n'
+ if [ $n -ne 0 ]
+ then
+ printf 'const uint16_t applet_numbers[] = {\n'
+ for i in $custom_scripts $applet_scripts
+ do
+ # TODO support applets with names including invalid characters
+ printf '\tAPPLET_NO_%s,\n' $i
+ done
+ printf '};\n'
+ fi
printf '#else\n'
- printf 'extern const char script_names[] ALIGN1;\n'
+ if [ $n -ne 0 ]
+ then
+ printf 'extern const uint16_t applet_numbers[];\n'
+ fi
printf '#endif\n'
fi
-printf "#define NUM_SCRIPTS $n\n\n"
+
+printf "\n"
+printf '#define NUM_SCRIPTS %d\n' $n
+printf "\n"
if [ $n -ne 0 ]
then
printf '#define UNPACKED_SCRIPTS_LENGTH '
- for i in $scripts
- do
- cat $loc/$i
- printf '\000'
- done | wc -c
+ concatenate_scripts | wc -c
printf '#define PACKED_SCRIPTS \\\n'
- for i in $scripts
- do
- cat $loc/$i
- printf '\000'
- done | bzip2 -1 | $DD bs=2 skip=1 2>/dev/null | od -v -b \
+ concatenate_scripts | bzip2 -1 | $DD bs=2 skip=1 2>/dev/null | \
+ od -v -b \
| grep -v '^ ' \
| $SED -e 's/^[^ ]*//' \
-e 's/ //g' \
diff --git a/scripts/gen_build_files.sh b/scripts/gen_build_files.sh
index f79fa2f83..64e4bffa9 100755
--- a/scripts/gen_build_files.sh
+++ b/scripts/gen_build_files.sh
@@ -17,12 +17,26 @@ status() { printf ' %-8s%s\n' "$1" "$2"; }
gen() { status "GEN" "$@"; }
chk() { status "CHK" "$@"; }
+# scripts in the 'embed' directory are treated as fake applets
+custom_scripts()
+{
+ custom_loc="$1"
+ if [ -d "$custom_loc" ]
+ then
+ for i in $(cd "$custom_loc"; ls *)
+ do
+ printf "APPLET_SCRIPTED(%s, scripted, BB_DIR_USR_BIN, BB_SUID_DROP, dummy)\n" $i;
+ done
+ fi
+}
+
generate()
{
# NB: data to be inserted at INSERT line is coming on stdin
src="$1"
dst="$2"
header="$3"
+ loc="$4"
#chk "${dst}"
{
# Need to use printf: different shells have inconsistent
@@ -32,6 +46,10 @@ generate()
sed -n '/^INSERT$/ q; p' "${src}"
# copy stdin to stdout
cat
+ if [ -n "$loc" ]
+ then
+ custom_scripts "$loc"
+ fi
# print everything after INSERT line
sed -n '/^INSERT$/ {
:l
@@ -53,7 +71,8 @@ sed -n 's@^//applet:@@p' "$srctree"/*/*.c "$srctree"/*/*/*.c \
| generate \
"$srctree/include/applets.src.h" \
"include/applets.h" \
- "/* DO NOT EDIT. This file is generated from applets.src.h */"
+ "/* DO NOT EDIT. This file is generated from applets.src.h */" \
+ "$srctree/embed"
# (Re)generate include/usage.h
# We add line continuation backslash after each line,
diff --git a/shell/ash.c b/shell/ash.c
index b1f8f15d2..44b3569dc 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -158,6 +158,10 @@
//config: at build time. Like applets, scripts can be run as
//config: 'busybox SCRIPT ...' or by linking their name to the binary.
//config:
+//config: This also allows applets to be implemented as scripts: place
+//config: the script in 'applets_sh' and a stub C file containing
+//config: configuration in the appropriate subsystem directory.
+//config:
//config:endif # ash options
//applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
@@ -8016,9 +8020,6 @@ tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) const char \
*cmd, char **argv, c {
#if ENABLE_FEATURE_SH_STANDALONE
if (applet_no >= 0) {
-# if NUM_SCRIPTS > 0
- if (applet_no < NUM_APPLETS)
-# endif
if (APPLET_IS_NOEXEC(applet_no)) {
clearenv();
while (*envp)
@@ -8088,9 +8089,6 @@ static void shellexec(char *prog, char **argv, const char \
*path, int idx) if (strchr(prog, '/') != NULL
#if ENABLE_FEATURE_SH_STANDALONE
|| (applet_no = find_applet_by_name(prog)) >= 0
-# if NUM_SCRIPTS > 0
- || (applet_no = NUM_APPLETS + find_script_by_name(prog)) >= 0
-# endif
#endif
) {
tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) prog, argv, envp);
@@ -10192,10 +10190,6 @@ evalcommand(union node *cmd, int flags)
*/
/* find_command() encodes applet_no as (-2 - applet_no) */
int applet_no = (- cmdentry.u.index - 2);
-# if NUM_SCRIPTS > 0
- /* Applets are ok, but not embedded scripts */
- if (applet_no < NUM_APPLETS)
-# endif
if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
char **sv_environ;
@@ -13378,11 +13372,6 @@ find_command(char *name, struct cmdentry *entry, int act, \
const char *path) #if ENABLE_FEATURE_SH_STANDALONE
{
int applet_no = find_applet_by_name(name);
-# if NUM_SCRIPTS > 0
- if (applet_no < 0)
- /* embedded script indices are offset by NUM_APPLETS */
- applet_no = NUM_APPLETS + find_script_by_name(name);
-# endif
if (applet_no >= 0) {
entry->cmdtype = CMDNORMAL;
entry->u.index = -2 - applet_no;
diff --git a/util-linux/nologin.c b/util-linux/nologin.c
new file mode 100644
index 000000000..52c640784
--- /dev/null
+++ b/util-linux/nologin.c
@@ -0,0 +1,27 @@
+//config:config NOLOGIN
+//config: bool "nologin"
+//config: default y
+//config: depends on ASH_EMBEDDED_SCRIPTS
+//config: help
+//config: Politely refuse a login
+//config:
+//config:config NOLOGIN_DEPENDENCIES
+//config: bool "Dependencies for nologin"
+//config: default y
+//config: depends on NOLOGIN
+//config: select CAT
+//config: select ECHO
+//config: select SLEEP
+//config: help
+//config: nologin is implemented as a shell script. It requires the
+//config: following in the runtime environment:
+//config: cat echo sleep
+//config: If you know these will be available externally you can
+//config: disable this option.
+
+//applet:IF_NOLOGIN(APPLET_SCRIPTED(nologin, scripted, BB_DIR_USR_SBIN, \
BB_SUID_DROP, nologin)) +
+//usage:#define nologin_trivial_usage
+//usage: ""
+//usage:#define nologin_full_usage "\n\n"
+//usage: "Display a message that an account is not available and exit non-zero."
--
2.19.1
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