commit 98fc2f167ba8e7efae68c15faa0430e674146adf
from: Stefan Sperling <stsp@stsp.name>
date: Mon Jul 31 15:54:30 2023 UTC

allow nsh to change its behaviour when standard input is not a TTY

Introduce an 'interactive_mode' flag which indicates whether standard
input is a TTY. This allows nsh to accept commands on standard input
for scripting purposes.

This will be needed for better integration of at(1).

The 'enable' command will not work in non-interactive mode yet.
This will be fixed soon.

commit - d759fe74722c022dcd2a5a19883955a8fad0be91
commit + 98fc2f167ba8e7efae68c15faa0430e674146adf
blob - 558ac64311cec683fc889aba680d75cd27ce03b0
blob + 2a3c298673f93f97a419f91e4124069c9e698f95
--- bgpnsh/bgpnsh.c
+++ bgpnsh/bgpnsh.c
@@ -50,7 +50,7 @@ void sigalarm(int signo)
 	}
 }
 
-int editing = 1, config_mode = 0;
+int editing = 1, config_mode = 0, interactive_mode = 1;
 int cli_rtable;
 int bridge;
 size_t Intlist_nitems = 0, Bridgelist_nitems = 0;
blob - 2c6b28c32e26056d4f1939cbe118d5492a29d10d
blob + c440e51e830f8c0921801bbfb8fa0ba494c27689
--- commands.c
+++ commands.c
@@ -387,7 +387,8 @@ quit(void)
 	if (privexec) {
 		exit(NSH_REXEC_EXIT_CODE_QUIT);
 	} else {
-		printf("%% Session terminated.\n");
+		if (interactive_mode)
+			printf("%% Session terminated.\n");
 		exit(0);
 	}
 	return 0;
@@ -1465,16 +1466,18 @@ interface(int argc, char **argv, char *modhvar)
 		return(0);
 	}
 
-	/* human at the keyboard */
+	/* human at the keyboard or commands on stdin */
 	for (;;) {
 		char *margp;
 
 		if (!editing) {
 			/* command line editing disabled */
-			printf("%s", iprompt());
+			if (interactive_mode)
+				printf("%s", iprompt());
 			if (fgets(line, sizeof(line), stdin) == NULL) {
 				if (feof(stdin) || ferror(stdin)) {
-					printf("\n");
+					if (interactive_mode)
+						printf("\n");
 					ifname[0] = '\0';
 					close(ifs);
 					return(0);
@@ -2041,10 +2044,12 @@ command()
 
 	for (;;) {
 		if (!editing) {
-			printf("%s", cprompt());
+			if (interactive_mode)
+				printf("%s", cprompt());
 			if (fgets(line, sizeof(line), stdin) == NULL) {
 				if (feof(stdin) || ferror(stdin)) {
-					printf("\n");
+					if (interactive_mode)
+						printf("\n");
 					(void) quit();
 					/* NOTREACHED */
 				}
@@ -3081,6 +3086,14 @@ do_reboot(int how)
 		    "changes.\n"
 		    "%% The 'write-config' command will save changes to %s.\n",
 		    NSHRC);
+		if (!interactive_mode)
+			return -1;
+	}
+
+	if (!interactive_mode) {
+		if (cmdargs(argv[0], argv) != 0)
+			printf("%% %s command failed\n", argv[0]);
+		return 0;
 	}
 
 	switch (how) {
blob - 98be4c1f2a50bf22257eacd7a22db984d21c26e7
blob + 6c8970da0e631c868440bba600cfb153a60347ad
--- externs.h
+++ externs.h
@@ -32,6 +32,7 @@ extern int  margc;		/* makeargv() arg count */
 extern char *margv[];		/* makeargv() args */
 extern int verbose;		/* is verbose mode on? */
 extern int editing;		/* is command line editing mode on? */
+extern int interactive_mode;	/* are we in interactive mode? */
 extern int config_mode;		/* are we in comfig mode? */
 extern int bridge;		/* are we in bridge mode (or interface mode?) */
 extern int priv;		/* privileged mode or not? */
blob - 746039c12f247f72374cc49c9792c96bcbe0ed52
blob + e0969dbbb8268b782af52a08caaad3fdc026cd70
--- main.c
+++ main.c
@@ -40,7 +40,7 @@ char *vers = NSH_VERSION_STR;
 int bridge = 0;		/* bridge mode for interface() */
 int verbose = 0;	/* verbose mode */
 int priv = 0, privexec = 0, cli_rtable = 0;
-int editing = 1, config_mode = 0;;
+int editing = 0, interactive_mode = 0, config_mode = 0;;
 pid_t pid;
 
 History *histi = NULL;
@@ -89,11 +89,6 @@ main(int argc, char *argv[])
 		}
 
 
-	if (getuid() != 0) {
-		printf("%% Functionality is limited without root privileges.\n"
-		    "%% The 'enable' command will switch to the root user.\n");
-	}
-
 	argc -= optind;
 	argv += optind;
 	if (cflag && iflag)
@@ -103,9 +98,20 @@ main(int argc, char *argv[])
 	if (iflag)
 		rmtemp(SQ3DBFILE);
 
-	if (!privexec)
-		printf("%% NSH v%s\n", vers);
+	interactive_mode = isatty(STDIN_FILENO);
+	if (interactive_mode) {
+		editing = 1;
 
+		if (getuid() != 0) {
+			printf("%% Functionality is limited without "
+			    "root privileges.\n%% The 'enable' command "
+			    "will switch to the root user.\n");
+		}
+
+		if (!privexec)
+			printf("%% NSH v%s\n", vers);
+	}
+
 	/* create temporal tables (if they aren't already there) */
 	if (db_create_table_rtables() < 0)
 		printf("%% database rtables creation failed\n");
blob - 845ca6a754fc316fb000478eb7a7ce4662cb1109
blob + 4eb03693ee206fa01a768404f84e7556a212871e
--- more.c
+++ more.c
@@ -58,7 +58,7 @@ more(char *fname)
 		return(0);
 	}
 
-	if (nsh_cbreak() < 0)
+	if (!interactive_mode || nsh_cbreak() < 0)
 		nopager = 1;
 
 	for (i = 0; (input = fgetln(f, &s)) != NULL; i++) {