libbb: invert the meaning of SETUP_ENV_NO_CHDIR -> SETUP_ENV_CHDIR

Double negatives are hard to grok.

function                                             old     new   delta
login_main                                           986     988      +2
su_main                                              474     470      -4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 2/-4)               Total: -2 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

include/libbb.h

@@ -1726,7 +1726,7 @@ extern void selinux_or_die(void) FAST_FUNC;
 
 
 /* setup_environment:
- * if !SETUP_ENV_NO_CHDIR:
+ * if SETUP_ENV_CHDIR:
  *   if cd(pw->pw_dir): ok: else if SETUP_ENV_TO_TMP: cd(/tmp) else: cd(/) or die
  * if SETUP_ENV_CLEARENV: cd(pw->pw_dir), clear environment, then set
  *   TERM=(old value)
@@ -1734,7 +1734,7 @@ extern void selinux_or_die(void) FAST_FUNC;
  *   PATH=bb_default_[root_]path
  *   HOME=pw->pw_dir
  *   SHELL=shell
- * else if SETUP_ENV_CHANGEENV:
+ * else if SETUP_ENV_CHANGEENV | SETUP_ENV_CHANGEENV_LOGNAME:
  *   if not root (if pw->pw_uid != 0) or if SETUP_ENV_CHANGEENV_LOGNAME:
  *     USER=pw->pw_name, LOGNAME=pw->pw_name
  *   HOME=pw->pw_dir
@@ -1748,7 +1748,7 @@ extern void selinux_or_die(void) FAST_FUNC;
 #define SETUP_ENV_CHANGEENV_LOGNAME (1 << 1)
 #define SETUP_ENV_CLEARENV          (1 << 2)
 #define SETUP_ENV_TO_TMP            (1 << 3)
-#define SETUP_ENV_NO_CHDIR          (1 << 4)
+#define SETUP_ENV_CHDIR             (1 << 4)
 void setup_environment(const char *shell, int flags, const struct passwd *pw) FAST_FUNC;
 void nuke_str(char *str) FAST_FUNC;
 #if ENABLE_FEATURE_SECURETTY && !ENABLE_PAM

libbb/setup_environment.c

@@ -36,7 +36,7 @@ void FAST_FUNC setup_environment(const char *shell, int flags, const struct pass
 
 	/* Change the current working directory to be the home directory
 	 * of the user */
-	if (!(flags & SETUP_ENV_NO_CHDIR)) {
+	if (flags & SETUP_ENV_CHDIR) {
 		if (chdir(pw->pw_dir) != 0) {
 			bb_error_msg("can't change directory to '%s'", pw->pw_dir);
 			xchdir((flags & SETUP_ENV_TO_TMP) ? "/tmp" : "/");
@@ -59,7 +59,8 @@ void FAST_FUNC setup_environment(const char *shell, int flags, const struct pass
 		//xsetenv("LOGNAME", pw->pw_name);
 		//xsetenv("HOME",    pw->pw_dir);
 		//xsetenv("SHELL",   shell);
-	} else if (flags & SETUP_ENV_CHANGEENV) {
+	} else
+	if (flags & (SETUP_ENV_CHANGEENV|SETUP_ENV_CHANGEENV_LOGNAME)) {
 		/* Set HOME, SHELL, and if not becoming a super-user
 		 * or if SETUP_ENV_CHANGEENV_LOGNAME, USER and LOGNAME.  */
 		if ((flags & SETUP_ENV_CHANGEENV_LOGNAME) || pw->pw_uid != 0) {

loginutils/login.c

@@ -564,7 +564,9 @@ int login_main(int argc UNUSED_PARAM, char **argv)
 
 	change_identity(pw);
 	setup_environment(pw->pw_shell,
-			(!(opt & LOGIN_OPT_p) * SETUP_ENV_CLEARENV) + SETUP_ENV_CHANGEENV,
+			(!(opt & LOGIN_OPT_p) * SETUP_ENV_CLEARENV)
+				+ SETUP_ENV_CHANGEENV
+				+ SETUP_ENV_CHDIR,
 			pw);
 
 #if ENABLE_PAM

loginutils/su.c

@@ -176,10 +176,9 @@ int su_main(int argc UNUSED_PARAM, char **argv)
 
 	change_identity(pw);
 	setup_environment(opt_shell,
-			((flags & SU_OPT_l) / SU_OPT_l * SETUP_ENV_CLEARENV)
+		((flags & SU_OPT_l) ? (SETUP_ENV_CLEARENV + SETUP_ENV_CHDIR) : 0)
-			+ (!(flags & SU_OPT_mp) * SETUP_ENV_CHANGEENV)
+			+ (!(flags & SU_OPT_mp) * SETUP_ENV_CHANGEENV),
-			+ (!(flags & SU_OPT_l) * SETUP_ENV_NO_CHDIR),
+		pw);
-			pw);
 	IF_SELINUX(set_current_security_context(NULL);)
 
 	if (opt_command) {

loginutils/sulogin.c

@@ -94,10 +94,13 @@ int sulogin_main(int argc UNUSED_PARAM, char **argv)
 		shell = pwd->pw_shell;
 
 	/* util-linux 2.36.1 compat: cd to root's HOME, set a few envvars */
-	setup_environment(shell, SETUP_ENV_CHANGEENV | SETUP_ENV_CHANGEENV_LOGNAME, pwd);
+	setup_environment(shell, 0
+		+ SETUP_ENV_CHANGEENV_LOGNAME
+		+ SETUP_ENV_CHDIR
+		, pwd);
 	// no SETUP_ENV_CLEARENV
-	// SETUP_ENV_CHANGEENV[+LOGNAME] - set HOME, SHELL, USER,and LOGNAME
+	// SETUP_ENV_CHANGEENV_LOGNAME - set HOME, SHELL, USER,and LOGNAME
-	// no SETUP_ENV_NO_CHDIR - IOW: cd to $HOME
+	// SETUP_ENV_CHDIR - cd to $HOME
 
 	/* util-linux 2.36.1 compat: steal ctty if we don't have it yet
 	 * (yes, util-linux uses force=1)  */

miscutils/crontab.c

@@ -55,8 +55,8 @@ static void edit_file(const struct passwd *pas, const char *file)
 	/* initgroups, setgid, setuid */
 	change_identity(pas);
 	setup_environment(pas->pw_shell,
-			SETUP_ENV_CHANGEENV | SETUP_ENV_TO_TMP,
+		SETUP_ENV_CHANGEENV | SETUP_ENV_TO_TMP | SETUP_ENV_CHDIR,
-			pas);
+		pas);
 	ptr = getenv("VISUAL");
 	if (!ptr) {
 		ptr = getenv("EDITOR");

shell/ash.c

@@ -10791,7 +10791,7 @@ preadfd(void)
 			write(STDOUT_FILENO, "^C", 2);
 			raise(SIGINT);
 			/* raise(SIGINT) did not work! (e.g. if SIGINT
-			 * is SIG_INGed on startup, it stays SIG_IGNed)
+			 * is SIG_IGNed on startup, it stays SIG_IGNed)
 			 */
 			if (trap[SIGINT]) {
 				buf[0] = '\n';

shell/hush.c

@@ -10361,7 +10361,7 @@ int hush_main(int argc, char **argv)
 //it ignores TERM:
 //	bash -i -c 'kill $$; echo ALIVE'
 //	ALIVE
-//it resets SIG_INGed HUP to SIG_DFL:
+//it resets SIG_IGNed HUP to SIG_DFL:
 //	trap '' hup; bash -i -c 'kill -hup $$; echo ALIVE'
 //	Hangup   [the message is not printed by bash, it's the shell which started it]
 //is talkative about jobs and exiting: