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ash: allow shell scripts to be embedded in the binary

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To assist in the deployment of shell scripts it may be convenient
to embed them in the BusyBox binary.

'Embed scripts in the binary' takes any files in the directory
'embed', concatenates them with null separators, compresses them
and embeds them in the binary.

When scripts are embedded in the binary, scripts can be run as
'busybox SCRIPT [ARGS]' or by usual (sym)link mechanism.

embed/nologin is provided as an example.

function                                             old     new   delta
packed_scripts                                         -     123    +123
unpack_scripts                                         -      87     +87
ash_main                                            1103    1171     +68
run_applet_and_exit                                   78     128     +50
get_script_content                                     -      32     +32
script_names                                           -      10     +10
expmeta                                              663     659      -4
------------------------------------------------------------------------------
(add/remove: 4/0 grow/shrink: 2/1 up/down: 370/-4)            Total: 366 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2018-11-01 09:53:25 +01:00
parent 552796791f
commit 4f2ef4a836
9 changed files with 201 additions and 3 deletions
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8
include/libbb.h
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@ -1321,9 +1321,17 @@ void bb_logenv_override(void) FAST_FUNC;
#define MAIN_EXTERNALLY_VISIBLE
#endif
/* Embedded script support */
//int find_script_by_name(const char *arg IF_FEATURE_SH_STANDALONE(, int offset)) FAST_FUNC;
char *get_script_content(unsigned n) FAST_FUNC;
/* Applets which are useful from another applets */
int bb_cat(char** argv) FAST_FUNC;
int ash_main(int argc, char** argv)
#if ENABLE_ASH || ENABLE_SH_IS_ASH || ENABLE_BASH_IS_ASH
MAIN_EXTERNALLY_VISIBLE
#endif
;
/* If shell needs them, they exist even if not enabled as applets */
int echo_main(int argc, char** argv) IF_ECHO(MAIN_EXTERNALLY_VISIBLE);
int printf_main(int argc, char **argv) IF_PRINTF(MAIN_EXTERNALLY_VISIBLE);