This commit adds the following hush busybox upstream commits:
93ae7464e6e4 ("hush: restore SIGHUP handling, this time explain why we do what
we do")
1fdb33bd07e5 ("hush: restore tty pgrp on SIGHUP")
6101b6d3eaa0 ("hush: remove special handling of SIGHUP")
93e0898c663a ("shell: fix SIGWINCH and SIGCHLD (in hush) interrupting line
input, closes 15256")
969e00816835 ("hush: code shrink")
27be0e8cfeb6 ("shell: fix compile failures in some configs")
7d1c7d833785 ("ash,hush: use HOME for tab completion and prompts")
21afddefd258 ("hush: fix "error: invalid preprocessing directive ##"")
e53c7dbafc78 ("hush: fix set -n to act immediately, not just after run_list()
")
574b9c446da1 ("hush: fix var_LINENO3.tests failure")
49bcf9f40cff ("hush: speed up ${x//\*/|} too")
53b2fdcdba4c ("*: add NOINLINEs where code noticeably shrinks")
7c3e96d4b3d4 ("shell: use more compact SHELL_ASH / HUSH config defines. no code
changes")
62f1eed1e191 ("hush: in a comment, document what -i might be doing")
aaf3d5ba74c5 ("shell: tweak --help")
db5546ca1018 ("libbb: code shrink: introduce and use [_]exit_SUCCESS()")
931c55f9e2b4 ("libbb: invert the meaning of SETUP_ENV_NO_CHDIR ->
SETUP_ENV_CHDIR")
12566e7f9b5e ("ash,hush: fix handling of SIGINT while waiting for interactive
input")
987be932ed3c ("*: slap on a few ALIGN_PTR where appropriate")
Signed-off-by: Francis Laniel <francis.lan...@amarulasolutions.com>
---
common/cli_hush_2021.c | 2 +-
common/cli_hush_upstream.c | 224 +++++++++++++++++++++++++++----------
2 files changed, 164 insertions(+), 62 deletions(-)
diff --git a/common/cli_hush_2021.c b/common/cli_hush_2021.c
index 0a207d147b..4c46176cb2 100644
--- a/common/cli_hush_2021.c
+++ b/common/cli_hush_2021.c
@@ -26,7 +26,7 @@
/*
* BusyBox Version: UPDATE THIS WHEN PULLING NEW UPSTREAM REVISION!
*/
-#define BB_VER "1.34.0.git37460f5daff9"
+#define BB_VER "1.35.0.git7d1c7d833785"
/*
* Define hush features by the names used upstream.
diff --git a/common/cli_hush_upstream.c b/common/cli_hush_upstream.c
index 23392939e1..93796e87c5 100644
--- a/common/cli_hush_upstream.c
+++ b/common/cli_hush_upstream.c
@@ -339,7 +339,7 @@
* therefore we don't show them either.
*/
//usage:#define hush_trivial_usage
-//usage: "[-enxl] [-c 'SCRIPT' [ARG0 ARGS] | FILE [ARGS] | -s [ARGS]]"
+//usage: "[-enxl] [-c 'SCRIPT' [ARG0 ARGS] | FILE ARGS | -s ARGS]"
//usage:#define hush_full_usage "\n\n"
//usage: "Unix shell interpreter"
@@ -374,7 +374,7 @@
# define F_DUPFD_CLOEXEC F_DUPFD
#endif
-#if ENABLE_FEATURE_SH_EMBEDDED_SCRIPTS && !(ENABLE_ASH || ENABLE_SH_IS_ASH ||
ENABLE_BASH_IS_ASH)
+#if ENABLE_FEATURE_SH_EMBEDDED_SCRIPTS && !ENABLE_SHELL_ASH
# include "embedded_scripts.h"
#else
# define NUM_SCRIPTS 0
@@ -574,7 +574,7 @@ enum {
#define NULL_O_STRING { NULL }
#ifndef debug_printf_parse
-static const char *const assignment_flag[] = {
+static const char *const assignment_flag[] ALIGN_PTR = {
"MAYBE_ASSIGNMENT",
"DEFINITELY_ASSIGNMENT",
"NOT_ASSIGNMENT",
@@ -958,6 +958,7 @@ struct globals {
#if ENABLE_HUSH_INTERACTIVE
smallint promptmode; /* 0: PS1, 1: PS2 */
#endif
+ /* set by signal handler if SIGINT is received _and_ its trap is not
set */
smallint flag_SIGINT;
#ifndef __U_BOOT__
#if ENABLE_HUSH_LOOPS
@@ -1918,7 +1919,13 @@ static void restore_G_args(save_arg_t *sv, char **argv)
* SIGQUIT: ignore
* SIGTERM (interactive): ignore
* SIGHUP (interactive):
- * send SIGCONT to stopped jobs, send SIGHUP to all jobs and exit
+ * Send SIGCONT to stopped jobs, send SIGHUP to all jobs and exit.
+ * Kernel would do this for us ("orphaned process group" handling
+ * according to POSIX) if we are a session leader and thus our death
+ * frees the controlling tty, but to be bash-compatible, we also do it
+ * for every interactive shell's death by SIGHUP.
+ * (Also, we need to restore tty pgrp, otherwise e.g. Midnight Commander
+ * backgrounds when hush started from it gets killed by SIGHUP).
* SIGTTIN, SIGTTOU, SIGTSTP (if job control is on): ignore
* Note that ^Z is handled not by trapping SIGTSTP, but by seeing
* that all pipe members are stopped. Try this in bash:
@@ -2034,6 +2041,14 @@ enum {
static void record_pending_signo(int sig)
{
sigaddset(&G.pending_set, sig);
+#if ENABLE_FEATURE_EDITING
+ if (sig != SIGCHLD
+ || (G_traps && G_traps[SIGCHLD] && G_traps[SIGCHLD][0])
+ /* ^^^ if SIGCHLD, interrupt line reading only if it has a trap */
+ ) {
+ bb_got_signal = sig; /* for read_line_input: "we got a signal"
*/
+ }
+#endif
#if ENABLE_HUSH_FAST
if (sig == SIGCHLD) {
G.count_SIGCHLD++;
@@ -2265,20 +2280,27 @@ static int check_and_run_traps(void)
break;
#if ENABLE_HUSH_JOB
case SIGHUP: {
-//TODO: why are we doing this? ash and dash don't do this,
-//they have no handler for SIGHUP at all,
-//they rely on kernel to send SIGHUP+SIGCONT to orphaned process groups
- struct pipe *job;
- debug_printf_exec("%s: sig:%d default SIGHUP
handler\n", __func__, sig);
- /* bash is observed to signal whole process groups,
- * not individual processes */
- for (job = G.job_list; job; job = job->next) {
- if (job->pgrp <= 0)
- continue;
- debug_printf_exec("HUPing pgrp %d\n",
job->pgrp);
- if (kill(- job->pgrp, SIGHUP) == 0)
- kill(- job->pgrp, SIGCONT);
+ /* if (G_interactive_fd) - no need to check, the handler
+ * is only installed if we *are* interactive */
+ {
+ /* bash compat: "Before exiting, an interactive
+ * shell resends the SIGHUP to all jobs, running
+ * or stopped. Stopped jobs are sent SIGCONT
+ * to ensure that they receive the SIGHUP."
+ */
+ struct pipe *job;
+ debug_printf_exec("%s: sig:%d default SIGHUP
handler\n", __func__, sig);
+ /* bash is observed to signal whole process
groups,
+ * not individual processes */
+ for (job = G.job_list; job; job = job->next) {
+ if (job->pgrp <= 0)
+ continue;
+ debug_printf_exec("HUPing pgrp %d\n",
job->pgrp);
+ if (kill(- job->pgrp, SIGHUP) == 0)
+ kill(- job->pgrp, SIGCONT);
+ }
}
+ /* this restores tty pgrp, then kills us with SIGHUP */
sigexit(SIGHUP);
}
#endif
@@ -2581,10 +2603,15 @@ int set_local_var_2021(char *str, int flags)
}
#ifndef __U_BOOT__
+static int set_local_var0(char *str)
+{
+ return set_local_var(str, 0);
+}
+
static void FAST_FUNC set_local_var_from_halves(const char *name, const char
*val)
{
char *var = xasprintf("%s=%s", name, val);
- set_local_var(var, /*flag:*/ 0);
+ set_local_var0(var);
}
/* Used at startup and after each cd */
@@ -2788,30 +2815,54 @@ static void get_user_input(struct in_str *i)
for (;;) {
reinit_unicode_for_hush();
G.flag_SIGINT = 0;
- /* buglet: SIGINT will not make new prompt to appear _at once_,
- * only after <Enter>. (^C works immediately) */
- r = read_line_input(G.line_input_state, prompt_str,
+
+ bb_got_signal = 0;
+ if (!sigisemptyset(&G.pending_set)) {
+ /* Whoops, already got a signal, do not call
read_line_input */
+ bb_got_signal = r = -1;
+ } else {
+ /* For shell, LI_INTERRUPTIBLE is set:
+ * read_line_input will abort on either
+ * getting EINTR in poll() and bb_got_signal became !=
0,
+ * or if it sees bb_got_signal != 0
+ * (IOW: if signal arrives before poll() is reached).
+ * Interactive testcases:
+ * (while kill -INT $$; do sleep 1; done) &
+ * #^^^ prints ^C, prints prompt, repeats
+ * trap 'echo I' int; (while kill -INT $$; do sleep 1;
done) &
+ * #^^^ prints ^C, prints "I", prints prompt, repeats
+ * trap 'echo T' term; (while kill $$; do sleep 1;
done) &
+ * #^^^ prints "T", prints prompt, repeats
+ * #(bash 5.0.17 exits after first "T", looks like a
bug)
+ */
+ r = read_line_input(G.line_input_state, prompt_str,
G.user_input_buf,
CONFIG_FEATURE_EDITING_MAX_LEN-1
- );
- /* read_line_input intercepts ^C, "convert" it to SIGINT */
- if (r == 0) {
- raise(SIGINT);
+ );
+ /* read_line_input intercepts ^C, "convert" it to
SIGINT */
+ if (r == 0)
+ raise(SIGINT);
+ }
+ /* bash prints ^C (before running a trap, if any)
+ * both on keyboard ^C and on real SIGINT (non-kbd generated).
+ */
+ if (sigismember(&G.pending_set, SIGINT)) {
+ write(STDOUT_FILENO, "^C\n", 3);
+ G.last_exitcode = 128 | SIGINT;
}
check_and_run_traps();
- if (r != 0 && !G.flag_SIGINT)
+ if (r == 0) /* keyboard ^C? */
+ continue; /* go back, read another input line */
+ if (r > 0) /* normal input? (no ^C, no ^D, no signals) */
break;
- /* ^C or SIGINT: repeat */
- /* bash prints ^C even on real SIGINT (non-kbd generated) */
- write(STDOUT_FILENO, "^C\n", 3);
- G.last_exitcode = 128 | SIGINT;
- }
- if (r < 0) {
- /* EOF/error detected */
- /* ^D on interactive input goes to next line before exiting: */
- write(STDOUT_FILENO, "\n", 1);
- i->p = NULL;
- i->peek_buf[0] = r = EOF;
- return r;
+ if (!bb_got_signal) {
+ /* r < 0: ^D/EOF/error detected (but not signal) */
+ /* ^D on interactive input goes to next line before
exiting: */
+ write(STDOUT_FILENO, "\n", 1);
+ i->p = NULL;
+ i->peek_buf[0] = r = EOF;
+ return r;
+ }
+ /* it was a signal: go back, read another input line */
}
i->p = G.user_input_buf;
return (unsigned char)*i->p++;
@@ -2991,6 +3042,12 @@ static int i_getch(struct in_str *i)
if (ch != '\0') {
i->p++;
i->last_char = ch;
+#if ENABLE_HUSH_LINENO_VAR
+ if (ch == '\n') {
+ G.parse_lineno++;
+ debug_printf_parse("G.parse_lineno++ = %u\n",
G.parse_lineno);
+ }
+#endif
return ch;
}
return EOF;
@@ -3638,7 +3695,7 @@ static int glob_brace(char *pattern, o_string *o, int n)
* NEXT points past the terminator of the first element, and REST
* points past the final }. We will accumulate result names from
* recursive runs for each brace alternative in the buffer using
- * GLOB_APPEND. */
+ * GLOB_APPEND. */
p = begin + 1;
while (1) {
@@ -3954,7 +4011,7 @@ static void free_pipe_list(struct pipe *pi)
#ifndef debug_print_tree
static void debug_print_tree(struct pipe *pi, int lvl)
{
- static const char *const PIPE[] = {
+ static const char *const PIPE[] ALIGN_PTR = {
[PIPE_SEQ] = "SEQ",
[PIPE_AND] = "AND",
[PIPE_OR ] = "OR" ,
@@ -3989,7 +4046,7 @@ static void debug_print_tree(struct pipe *pi, int lvl)
[RES_XXXX ] = "XXXX" ,
[RES_SNTX ] = "SNTX" ,
};
- static const char *const CMDTYPE[] = {
+ static const char *const CMDTYPE[] ALIGN_PTR = {
"{}",
"()",
"[noglob]",
@@ -5354,7 +5411,7 @@ static int parse_dollar_squote(o_string *as_string,
o_string *dest, struct in_st
# undef as_string
}
#else
-# #define parse_dollar_squote(as_string, dest, input) 0
+# define parse_dollar_squote(as_string, dest, input) 0
#endif /* BASH_DOLLAR_SQUOTE */
#endif /* !__U_BOOT__ */
@@ -6721,7 +6778,7 @@ static char *encode_then_expand_vararg(const char *str,
int handle_squotes, int
/* Expanding ARG in ${var+ARG}, ${var-ARG}
*/
-static int encode_then_append_var_plusminus(o_string *output, int n,
+static NOINLINE int encode_then_append_var_plusminus(o_string *output, int n,
char *str, int dquoted)
{
struct in_str input;
@@ -6886,16 +6943,21 @@ static arith_t expand_and_evaluate_arith(const char
*arg, const char **errmsg_p)
/* ${var/[/]pattern[/repl]} helpers */
static char *strstr_pattern(char *val, const char *pattern, int *size)
{
- int sz = strcspn(pattern, "*?[\\");
- if (pattern[sz] == '\0') {
+ int first_escaped = (pattern[0] == '\\' && pattern[1]);
+ /* "first_escaped" trick allows to treat e.g. "\*no_glob_chars"
+ * as literal too (as it is semi-common, and easy to accomodate
+ * by just using str + 1).
+ */
+ int sz = strcspn(pattern + first_escaped * 2, "*?[\\");
+ if ((pattern + first_escaped * 2)[sz] == '\0') {
/* Optimization for trivial patterns.
* Testcase for very slow replace (performs about 22k replaces):
* x=::::::::::::::::::::::
*
x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;echo ${#x}
* echo "${x//:/|}"
*/
- *size = sz;
- return strstr(val, pattern);
+ *size = sz + first_escaped;
+ return strstr(val, pattern + first_escaped);
}
while (1) {
@@ -7371,7 +7433,7 @@ static NOINLINE int expand_one_var(o_string *output, int
n,
val = NULL;
} else {
char *new_var =
xasprintf("%s=%s", var, val);
- set_local_var(new_var,
/*flag:*/ 0);
+ set_local_var0(new_var);
}
}
}
@@ -8026,7 +8088,11 @@ static int parse_and_run_string(const char *s)
#endif /* __U_BOOT__ */
{
struct in_str input;
+#ifndef __U_BOOT__
+ IF_HUSH_LINENO_VAR(unsigned sv = G.parse_lineno;)
+#else /* __U_BOOT__ */
//IF_HUSH_LINENO_VAR(unsigned sv = G.parse_lineno;)
+#endif /* __U_BOOT__ */
setup_string_in_str(&input, s);
#ifndef __U_BOOT__
@@ -8034,7 +8100,11 @@ static int parse_and_run_string(const char *s)
#else /* __U_BOOT__ */
return parse_and_run_stream(&input, '\0');
#endif /* __U_BOOT__ */
- //IF_HUSH_LINENO_VAR(G.parse_lineno = sv;)
+#ifndef __U_BOOT__
+ IF_HUSH_LINENO_VAR(unsigned sv = G.parse_lineno;)
+#else /* __U_BOOT__ */
+ //IF_HUSH_LINENO_VAR(unsigned sv = G.parse_lineno;)
+#endif /* __U_BOOT__ */
}
#ifdef __U_BOOT__
@@ -8142,7 +8212,7 @@ static int generate_stream_from_string(const char *s,
pid_t *pid_p)
if (is_prefixed_with(s, "trap")
&& skip_whitespace(s + 4)[0] == '\0'
) {
- static const char *const argv[] = { NULL, NULL };
+ static const char *const argv[] ALIGN_PTR = { NULL,
NULL };
builtin_trap((char**)argv);
fflush_all(); /* important */
_exit(0);
@@ -8671,7 +8741,7 @@ static const struct built_in_command *find_builtin(const
char *name)
return find_builtin_helper(name, bltins2,
&bltins2[ARRAY_SIZE(bltins2)]);
}
-#if ENABLE_HUSH_JOB && EDITING_HAS_get_exe_name
+#if ENABLE_HUSH_JOB && ENABLE_FEATURE_TAB_COMPLETION
static const char * FAST_FUNC get_builtin_name(int i)
{
if (/*i >= 0 && */ i < ARRAY_SIZE(bltins1)) {
@@ -9107,7 +9177,7 @@ static NOINLINE void pseudo_exec_argv(nommu_save_t
*nommu_save,
* expand_assignments(): think about ... | var=`sleep 1` | ...
*/
free_strings(new_env);
- _exit(EXIT_SUCCESS);
+ _exit_SUCCESS();
}
sv_shadowed = G.shadowed_vars_pp;
@@ -9288,7 +9358,7 @@ static void pseudo_exec(nommu_save_t *nommu_save,
/* Case when we are here: ... | >file */
debug_printf_exec("pseudo_exec'ed null command\n");
- _exit(EXIT_SUCCESS);
+ _exit_SUCCESS();
}
#if ENABLE_HUSH_JOB
@@ -9895,7 +9965,7 @@ static NOINLINE int run_pipe(struct pipe *pi)
#endif
debug_printf_env("set shell var:'%s'->'%s'\n",
*argv, p);
#ifndef __U_BOOT__
- if (set_local_var(p, /*flag:*/ 0)) {
+ if (set_local_var0(p)) {
#else /* __U_BOOT__ */
if (set_local_var_2021(p, /*flag:*/ 0)) {
#endif
@@ -10421,7 +10491,7 @@ static int run_list(struct pipe *pi)
static const char encoded_dollar_at[] ALIGN1 = {
SPECIAL_VAR_SYMBOL, '@' | 0x80,
SPECIAL_VAR_SYMBOL, '\0'
}; /* encoded representation of "$@" */
- static const char *const
encoded_dollar_at_argv[] = {
+ static const char *const
encoded_dollar_at_argv[] ALIGN_PTR = {
encoded_dollar_at, NULL
}; /* argv list with one element: "$@" */
char **vals;
@@ -10452,7 +10522,7 @@ static int run_list(struct pipe *pi)
/* Insert next value from for_lcur */
/* note: *for_lcur already has quotes removed, $var
expanded, etc */
#ifndef __U_BOOT__
- set_local_var(xasprintf("%s=%s", pi->cmds[0].argv[0],
*for_lcur++), /*flag:*/ 0);
+ set_local_var_from_halves(pi->cmds[0].argv[0],
*for_lcur++);
#else /* __U_BOOT__ */
/* We cannot use xasprintf, so we emulate it. */
char *full_var;
@@ -10548,8 +10618,11 @@ static int run_list(struct pipe *pi)
G.flag_break_continue = 0;
#endif
#endif /* !__U_BOOT__ */
+#ifndef __U_BOOT__
+ rcode = r = G.o_opt[OPT_O_NOEXEC] ? 0 : run_pipe(pi);
+ /* NB: rcode is a smalluint, r is int */
+#else /* __U_BOOT__ */
rcode = r = run_pipe(pi); /* NB: rcode is a smalluint, r is int
*/
-#ifdef __U_BOOT__
if (r <= EXIT_RET_CODE) {
int previous_rcode = G.last_exitcode;
/*
@@ -10839,7 +10912,10 @@ static int set_mode(int state, char mode, const char
*o_opt)
int idx;
switch (mode) {
case 'n':
- G.o_opt[OPT_O_NOEXEC] = state;
+ /* set -n has no effect in interactive shell */
+ /* Try: while set -n; do echo $-; done */
+ if (!G_interactive_fd)
+ G.o_opt[OPT_O_NOEXEC] = state;
break;
case 'x':
IF_HUSH_MODE_X(G_x_mode = state;)
@@ -10912,7 +10988,7 @@ int hush_main(int argc, char **argv)
cached_getpid = getpid(); /* for tcsetpgrp() during init */
G.root_pid = cached_getpid; /* for $PID (NOMMU can override via
-$HEXPID:HEXPPID:...) */
- G.root_ppid = getppid(); /* for $PPID (NOMMU can override) */
+ G.root_ppid = getppid(); /* for $PPID (NOMMU can override) */
/* Deal with HUSH_VERSION */
debug_printf_env("unsetenv '%s'\n", "HUSH_VERSION");
@@ -11043,6 +11119,29 @@ int hush_main(int argc, char **argv)
/* Well, we cannot just declare interactiveness,
* we have to have some stuff (ctty, etc) */
/* G_interactive_fd++; */
+//There are a few cases where bash -i -c 'SCRIPT'
+//has visible effect (differs from bash -c 'SCRIPT'):
+//it ignores TERM:
+// bash -i -c 'kill $$; echo ALIVE'
+// ALIVE
+//it resets SIG_IGNed HUP to SIG_DFL:
+// trap '' hup; bash -i -c 'kill -hup $$; echo ALIVE'
+// Hangup [the message is not printed by bash, it's the shell which
started it]
+//is talkative about jobs and exiting:
+// bash -i -c 'sleep 1 & exit'
+// [1] 16170
+// exit
+//includes $ENV file (only if run as "sh"):
+// echo last >/tmp/ENV; ENV=/tmp/ENV sh -i -c 'echo HERE'
+// last: cannot open /var/log/wtmp: No such file or directory
+// HERE
+//(under "bash", it's the opposite: it runs $BASH_ENV file only *without* -i).
+//
+//ash -i -c 'sleep 3; sleep 3', on ^C, drops into a prompt instead of exiting
+//(this may be a bug, bash does not do this).
+//(ash -i -c 'sleep 3' won't show this, the last command gets auto-"exec"ed)
+//
+//None of the above feel like useful features people would rely on.
break;
case 's':
G.opt_s = 1;
@@ -11307,9 +11406,12 @@ int hush_main(int argc, char **argv)
# if ENABLE_FEATURE_EDITING
G.line_input_state = new_line_input_t(FOR_SHELL);
-# if EDITING_HAS_get_exe_name
+# if ENABLE_FEATURE_TAB_COMPLETION
G.line_input_state->get_exe_name = get_builtin_name;
# endif
+# if EDITING_HAS_sh_get_var
+ G.line_input_state->sh_get_var = get_local_var_value;
+# endif
# endif
# if ENABLE_HUSH_SAVEHISTORY && MAX_HISTORY > 0
{
@@ -12422,7 +12524,7 @@ static int FAST_FUNC builtin_fg_bg(char **argv)
/* TODO: bash prints a string representation
* of job being foregrounded (like "sleep 1 | cat") */
if (argv[0][0] == 'f' && G_saved_tty_pgrp) {
- /* Put the job into the foreground. */
+ /* Put the job into the foreground. */
tcsetpgrp(G_interactive_fd, pi->pgrp);
}
--
2.34.1
