hush: fix multimple dependent variable expansion cases
function old new delta get_local_var_value 100 171 +71 expand_assignments 46 76 +30 reset_traps_to_defaults 229 238 +9 maybe_set_to_sigexit 47 50 +3 init_sigmasks 211 214 +3 builtin_trap 462 465 +3 expand_vars_to_list 2412 2408 -4 run_pipe 1568 1533 -35 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 6/2 up/down: 119/-39) Total: 80 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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202a2d1219
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29082231d0
108
shell/hush.c
108
shell/hush.c
@ -221,7 +221,8 @@
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//config: default y
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//config: depends on HUSH
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//config: help
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//config: This instructs hush to print commands before execution. Adds ~300 bytes.
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//config: This instructs hush to print commands before execution.
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//config: Adds ~300 bytes.
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//config:
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//usage:#define hush_trivial_usage NOUSAGE_STR
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@ -664,7 +665,7 @@ struct globals {
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smallint n_mode;
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#if ENABLE_HUSH_MODE_X
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smallint x_mode;
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# define G_x_mode G.x_mode
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# define G_x_mode (G.x_mode)
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#else
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# define G_x_mode 0
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#endif
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@ -688,6 +689,7 @@ struct globals {
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const char *cwd;
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struct variable *top_var; /* = &G.shell_ver (set in main()) */
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struct variable shell_ver;
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char **expanded_assignments;
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#if ENABLE_HUSH_FUNCTIONS
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struct function *top_func;
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# if ENABLE_HUSH_LOCAL
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@ -1459,9 +1461,23 @@ static struct variable *get_local_var(const char *name)
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static const char* FAST_FUNC get_local_var_value(const char *name)
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{
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struct variable **pp = get_ptr_to_local_var(name);
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if (pp)
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return strchr((*pp)->varstr, '=') + 1;
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struct variable **vpp;
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if (G.expanded_assignments) {
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char **cpp = G.expanded_assignments;
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int len = strlen(name);
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while (*cpp) {
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char *cp = *cpp;
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if (strncmp(cp, name, len) == 0 && cp[len] == '=')
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return cp + len + 1;
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cpp++;
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}
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}
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vpp = get_ptr_to_local_var(name);
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if (vpp)
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return strchr((*vpp)->varstr, '=') + 1;
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if (strcmp(name, "PPID") == 0)
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return utoa(G.root_ppid);
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// bash compat: UID? EUID?
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@ -3090,11 +3106,14 @@ static char* expand_strvec_to_string(char **argv)
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static char **expand_assignments(char **argv, int count)
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{
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int i;
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char **p = NULL;
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char **p;
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G.expanded_assignments = p = NULL;
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/* Expand assignments into one string each */
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for (i = 0; i < count; i++) {
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p = add_string_to_strings(p, expand_string_to_string(argv[i]));
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G.expanded_assignments = p = add_string_to_strings(p, expand_string_to_string(argv[i]));
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}
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G.expanded_assignments = NULL;
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return p;
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}
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@ -4316,6 +4335,27 @@ static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
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* backgrounded: cmd & { list } &
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* subshell: ( list ) [&]
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*/
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#if !ENABLE_HUSH_MODE_X
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#define redirect_and_varexp_helper(new_env_p, old_vars_p, command, squirrel, char argv_expanded) \
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redirect_and_varexp_helper(new_env_p, old_vars_p, command, squirrel)
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#endif
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static int redirect_and_varexp_helper(char ***new_env_p, struct variable **old_vars_p, struct command *command, int squirrel[3], char **argv_expanded)
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{
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/* setup_redirects acts on file descriptors, not FILEs.
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* This is perfect for work that comes after exec().
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* Is it really safe for inline use? Experimentally,
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* things seem to work. */
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int rcode = setup_redirects(command, squirrel);
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if (rcode == 0) {
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char **new_env = expand_assignments(command->argv, command->assignment_cnt);
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*new_env_p = new_env;
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dump_cmd_in_x_mode(new_env);
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dump_cmd_in_x_mode(argv_expanded);
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if (old_vars_p)
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*old_vars_p = set_vars_and_save_old(new_env);
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}
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return rcode;
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}
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static NOINLINE int run_pipe(struct pipe *pi)
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{
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static const char *const null_ptr = NULL;
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@ -4325,7 +4365,6 @@ static NOINLINE int run_pipe(struct pipe *pi)
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struct command *command;
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char **argv_expanded;
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char **argv;
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char *p;
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/* it is not always needed, but we aim to smaller code */
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int squirrel[] = { -1, -1, -1 };
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int rcode;
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@ -4402,19 +4441,45 @@ static NOINLINE int run_pipe(struct pipe *pi)
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if (argv[command->assignment_cnt] == NULL) {
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/* Assignments, but no command */
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/* Ensure redirects take effect (that is, create files).
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* Try "a=t >file": */
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* Try "a=t >file" */
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#if 0 /* A few cases in testsuite fail with this code. FIXME */
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rcode = redirect_and_varexp_helper(&new_env, /*old_vars:*/ NULL, command, squirrel, /*argv_expanded:*/ NULL);
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/* Set shell variables */
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if (new_env) {
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argv = new_env;
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while (*argv) {
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set_local_var(*argv, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
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/* Do we need to flag set_local_var() errors?
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* "assignment to readonly var" and "putenv error"
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*/
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argv++;
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}
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}
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/* Redirect error sets $? to 1. Otherwise,
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* if evaluating assignment value set $?, retain it.
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* Try "false; q=`exit 2`; echo $?" - should print 2: */
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if (rcode == 0)
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rcode = G.last_exitcode;
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/* Exit, _skipping_ variable restoring code: */
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goto clean_up_and_ret0;
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#else /* Older, bigger, but more correct code */
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rcode = setup_redirects(command, squirrel);
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restore_redirects(squirrel);
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/* Set shell variables */
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if (G_x_mode)
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bb_putchar_stderr('+');
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while (*argv) {
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p = expand_string_to_string(*argv);
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char *p = expand_string_to_string(*argv);
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if (G_x_mode)
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fprintf(stderr, " %s", p);
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debug_printf_exec("set shell var:'%s'->'%s'\n",
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*argv, p);
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set_local_var(p, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
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/* Do we need to flag set_local_var() errors?
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* "assignment to readonly var" and "putenv error"
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*/
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argv++;
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}
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if (G_x_mode)
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@ -4424,13 +4489,11 @@ static NOINLINE int run_pipe(struct pipe *pi)
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* Try "false; q=`exit 2`; echo $?" - should print 2: */
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if (rcode == 0)
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rcode = G.last_exitcode;
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/* Do we need to flag set_local_var() errors?
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* "assignment to readonly var" and "putenv error"
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*/
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IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
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debug_leave();
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debug_printf_exec("run_pipe: return %d\n", rcode);
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return rcode;
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#endif
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}
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/* Expand the rest into (possibly) many strings each */
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@ -4471,16 +4534,8 @@ static NOINLINE int run_pipe(struct pipe *pi)
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goto clean_up_and_ret1;
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}
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}
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/* setup_redirects acts on file descriptors, not FILEs.
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* This is perfect for work that comes after exec().
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* Is it really safe for inline use? Experimentally,
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* things seem to work. */
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rcode = setup_redirects(command, squirrel);
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rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, squirrel, argv_expanded);
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if (rcode == 0) {
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new_env = expand_assignments(argv, command->assignment_cnt);
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dump_cmd_in_x_mode(new_env);
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dump_cmd_in_x_mode(argv_expanded);
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old_vars = set_vars_and_save_old(new_env);
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if (!funcp) {
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debug_printf_exec(": builtin '%s' '%s'...\n",
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x->b_cmd, argv_expanded[1]);
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@ -4504,9 +4559,10 @@ static NOINLINE int run_pipe(struct pipe *pi)
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#endif
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}
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clean_up_and_ret:
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restore_redirects(squirrel);
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unset_vars(new_env);
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add_vars(old_vars);
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/* clean_up_and_ret0: */
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restore_redirects(squirrel);
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clean_up_and_ret1:
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free(argv_expanded);
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IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
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@ -4518,12 +4574,8 @@ static NOINLINE int run_pipe(struct pipe *pi)
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if (ENABLE_FEATURE_SH_STANDALONE) {
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int n = find_applet_by_name(argv_expanded[0]);
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if (n >= 0 && APPLET_IS_NOFORK(n)) {
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rcode = setup_redirects(command, squirrel);
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rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, squirrel, argv_expanded);
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if (rcode == 0) {
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new_env = expand_assignments(argv, command->assignment_cnt);
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dump_cmd_in_x_mode(new_env);
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dump_cmd_in_x_mode(argv_expanded);
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old_vars = set_vars_and_save_old(new_env);
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debug_printf_exec(": run_nofork_applet '%s' '%s'...\n",
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argv_expanded[0], argv_expanded[1]);
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rcode = run_nofork_applet(n, argv_expanded);
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5
shell/hush_test/hush-vars/var_serial.right
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5
shell/hush_test/hush-vars/var_serial.right
Normal file
@ -0,0 +1,5 @@
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Assignments only: c=a
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Assignments and a command: c=a
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Assignments and a builtin: c=a
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Assignments and a function: c=a
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Done
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22
shell/hush_test/hush-vars/var_serial.tests
Executable file
22
shell/hush_test/hush-vars/var_serial.tests
Executable file
@ -0,0 +1,22 @@
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a=a
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b=b
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c=c
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# Second assignment depends on the first:
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b=$a c=$b
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echo Assignments only: c=$c
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b=b
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c=c
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b=$a c=$b "$THIS_SH" -c 'echo Assignments and a command: c=$c'
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b=b
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c=c
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b=$a c=$b eval 'echo Assignments and a builtin: c=$c'
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b=b
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c=c
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f() { echo Assignments and a function: c=$c; }
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b=$a c=$b f
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echo Done
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