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hush: in a comment, document what -i might be doing

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2021-10-12 22:39:11 +02:00
parent c33bbcb92f
commit 62f1eed1e1
2 changed files with 28 additions and 6 deletions
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5
shell/ash.c
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@ -14657,11 +14657,10 @@ int ash_main(int argc UNUSED_PARAM, char **argv)
}
state2:
state = 3;
if (
if (iflag
#ifndef linux
getuid() == geteuid() && getgid() == getegid() &&
&& getuid() == geteuid() && getgid() == getegid()
#endif
iflag
) {
const char *shinit = lookupvar("ENV");
if (shinit != NULL && *shinit != '\0')

29
shell/hush.c
View File

@ -3360,7 +3360,7 @@ 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) {
@ -10225,7 +10225,7 @@ 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");
@ -10356,6 +10356,29 @@ 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 $$; echo ALIVE'
// ALIVE
//it resets SIG_INGed HUP to SIG_DFL:
// trap '' hup; bash -i -c 'kill -hup $$; 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;
@ -11732,7 +11755,7 @@ 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);
}