[git commit] ash,hush: show 'c' in $- if run in "sh -c CMD"
Denys Vlasenko
vda.linux at googlemail.com
Mon Jun 3 10:21:04 UTC 2019
commit: https://git.busybox.net/busybox/commit/?id=f3634584d0fdeb4ae9e2fe0f5971d45b77e40296
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master
function old new delta
options 552 599 +47
expand_one_var 2375 2385 +10
optletters_optnames 60 64 +4
hush_main 1108 1111 +3
ash_main 1150 1152 +2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 5/0 up/down: 66/0) Total: 66 bytes
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
shell/ash.c | 62 ++++++++++++++++++++++++++++++++++++++++--------------------
shell/hush.c | 13 ++++++++-----
2 files changed, 50 insertions(+), 25 deletions(-)
diff --git a/shell/ash.c b/shell/ash.c
index c8857366c..e3bbac9a0 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -315,17 +315,18 @@ static const char *const optletters_optnames[] = {
"e" "errexit",
"f" "noglob",
"I" "ignoreeof",
-/* The below allows this invocation:
+/* The below allowed this invocation:
* ash -c 'set -i; echo $-; sleep 5; echo $-'
* to be ^C-ed and get to interactive ash prompt.
- * bash does not support this "set -i". bash also has no
- * "set -o interactive".
+ * bash does not support such "set -i".
+ * In our code, this is denoted by empty long name:
*/
- "i" "interactive",
+ "i" "",
"m" "monitor",
"n" "noexec",
-/* Ditto: bash has no "set -s" and "set -o stdin" */
- "s" "stdin",
+/* Ditto: bash has no "set -s" */
+ "s" "",
+ "c" "",
"x" "xtrace",
"v" "verbose",
"C" "noclobber",
@@ -359,7 +360,6 @@ static const char *const optletters_optnames[] = {
#define optletters(n) optletters_optnames[n][0]
#define optnames(n) (optletters_optnames[n] + 1)
-
enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
@@ -419,21 +419,22 @@ struct globals_misc {
#define mflag optlist[4]
#define nflag optlist[5]
#define sflag optlist[6]
-#define xflag optlist[7]
-#define vflag optlist[8]
-#define Cflag optlist[9]
-#define aflag optlist[10]
-#define bflag optlist[11]
-#define uflag optlist[12]
-#define viflag optlist[13]
+#define cflag optlist[7]
+#define xflag optlist[8]
+#define vflag optlist[9]
+#define Cflag optlist[10]
+#define aflag optlist[11]
+#define bflag optlist[12]
+#define uflag optlist[13]
+#define viflag optlist[14]
#if BASH_PIPEFAIL
-# define pipefail optlist[14]
+# define pipefail optlist[15]
#else
# define pipefail 0
#endif
#if DEBUG
-# define nolog optlist[14 + BASH_PIPEFAIL]
-# define debug optlist[15 + BASH_PIPEFAIL]
+# define nolog optlist[15 + BASH_PIPEFAIL]
+# define debug optlist[16 + BASH_PIPEFAIL]
#endif
/* trap handler commands */
@@ -11104,7 +11105,7 @@ setoption(int flag, int val)
int i;
for (i = 0; i < NOPTS; i++) {
- if (optletters(i) == flag) {
+ if (optletters(i) == flag && optnames(i)[0] != '\0') {
optlist[i] = val;
return;
}
@@ -11150,6 +11151,15 @@ options(int *login_sh)
/* bash 3.2 indeed handles -c CMD and +c CMD the same */
if (c == 'c') {
minusc = p; /* command is after shell args */
+ cflag = 1;
+ continue;
+ }
+ if (c == 's') { /* -s, +s */
+ sflag = 1;
+ continue;
+ }
+ if (c == 'i') { /* -i, +i */
+ iflag = 1;
continue;
}
if (c == 'l') {
@@ -14170,8 +14180,13 @@ procargs(char **argv)
ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
sflag = 1;
}
- if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
+ if (iflag == 2 /* no explicit -i given */
+ && sflag == 1 /* -s given (or implied) */
+ && !minusc /* bash compat: ash -sc 'echo $-' is not interactive (dash is) */
+ && isatty(0) && isatty(1) /* we are on tty */
+ ) {
iflag = 1;
+ }
if (mflag == 2)
mflag = iflag;
for (i = 0; i < NOPTS; i++)
@@ -14359,10 +14374,17 @@ int ash_main(int argc UNUSED_PARAM, char **argv)
* Ensure we don't falsely claim that 0 (stdin)
* is one of stacked source fds.
* Testcase: ash -c 'exec 1>&0' must not complain. */
+
// if (!sflag) g_parsefile->pf_fd = -1;
// ^^ not necessary since now we special-case fd 0
// in save_fd_on_redirect()
- evalstring(minusc, sflag ? 0 : EV_EXIT);
+
+ // dash: evalstring(minusc, sflag ? 0 : EV_EXIT);
+ // The above makes
+ // ash -sc 'echo $-'
+ // continue reading input from stdin after running 'echo'.
+ // bash does not do this: it prints "hBcs" and exits.
+ evalstring(minusc, EV_EXIT);
}
if (sflag || minusc == NULL) {
diff --git a/shell/hush.c b/shell/hush.c
index 4b08232a4..f82747f74 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -903,6 +903,7 @@ struct globals {
# define G_x_mode 0
#endif
char opt_s;
+ char opt_c;
#if ENABLE_HUSH_INTERACTIVE
smallint promptmode; /* 0: PS1, 1: PS2 */
#endif
@@ -1009,7 +1010,7 @@ struct globals {
int debug_indent;
#endif
struct sigaction sa;
- char optstring_buf[sizeof("eixs")];
+ char optstring_buf[sizeof("eixcs")];
#if BASH_EPOCH_VARS
char epoch_buf[sizeof("%lu.nnnnnn") + sizeof(long)*3];
#endif
@@ -6414,9 +6415,10 @@ static NOINLINE int expand_one_var(o_string *output, int n,
* commands read but are not executed,
* so $- can not execute too, 'n' is never seen in $-.
*/
+ if (G.opt_c)
+ *cp++ = 'c';
if (G.opt_s)
*cp++ = 's';
-//TODO: show 'c' if executed via "hush -c 'CMDS'" (bash only, not ash)
*cp = '\0';
break;
}
@@ -9859,7 +9861,6 @@ int hush_main(int argc, char **argv)
{
enum {
OPT_login = (1 << 0),
- OPT_s = (1 << 1),
};
unsigned flags;
unsigned builtin_argc;
@@ -10029,6 +10030,7 @@ int hush_main(int argc, char **argv)
}
goto final_return;
}
+ G.opt_c = 1;
if (!G.global_argv[0]) {
/* -c 'script' (no params): prevent empty $0 */
G.global_argv--; /* points to argv[i] of 'script' */
@@ -10044,7 +10046,7 @@ int hush_main(int argc, char **argv)
/* G_interactive_fd++; */
break;
case 's':
- flags |= OPT_s;
+ G.opt_s = 1;
break;
case 'l':
flags |= OPT_login;
@@ -10154,7 +10156,7 @@ int hush_main(int argc, char **argv)
}
/* -s is: hush -s ARGV1 ARGV2 (no SCRIPT) */
- if (!(flags & OPT_s) && G.global_argv[1]) {
+ if (!G.opt_s && G.global_argv[1]) {
HFILE *input;
/*
* "bash <script>" (which is never interactive (unless -i?))
@@ -10178,6 +10180,7 @@ int hush_main(int argc, char **argv)
#endif
goto final_return;
}
+ /* "implicit" -s: bare interactive hush shows 's' in $- */
G.opt_s = 1;
/* Up to here, shell was non-interactive. Now it may become one.
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