permit passing in the filesystem (a file) as an argument

1 files changed, 29 insertions, 8 deletions

diff --git a/distrib/common/rdsetroot.c b/distrib/common/rdsetroot.c
index 2650d15eb59..8a62cbfe9de 100644
--- a/distrib/common/rdsetroot.c
+++ b/distrib/common/rdsetroot.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: rdsetroot.c,v 1.17 2008/12/02 01:54:55 weerd Exp $	*/
+/*	$OpenBSD: rdsetroot.c,v 1.18 2008/12/02 03:20:38 deraadt Exp $	*/
 /*	$NetBSD: rdsetroot.c,v 1.2 1995/10/13 16:38:39 gwr Exp $	*/
 
 /*
@@ -71,7 +71,8 @@ int	debug;
 int
 main(int argc, char *argv[])
 {
-	int ch, fd, n, xflag = 0;
+	int ch, fd, n, xflag = 0, fsd;
+	char *fs = NULL;
 	int *ip;
 
 	while ((ch = getopt(argc, argv, "dx")) != -1) {
@@ -89,9 +90,13 @@ main(int argc, char *argv[])
 	argc -= optind;
 	argv += optind;
 
-	if (argc != 1)
+	if (argc == 1)
+		file = argv[0];
+	else if (argc == 2) {
+		file = argv[0];
+		fs = argv[1];
+	} else
 		usage();
-	file = argv[0];
 
 	fd = open(file, xflag ? O_RDONLY : O_RDWR, 0644);
 	if (fd < 0) {
@@ -99,6 +104,22 @@ main(int argc, char *argv[])
 		exit(1);
 	}
 
+	if (fs) {
+		if (xflag)
+			fsd = open(fs, O_RDWR | O_CREAT | O_TRUNC, 0644);
+		else
+			fsd = open(fs, O_RDONLY, 0644);
+	} else {
+		if (xflag)
+			fsd = dup(STDOUT_FILENO);
+		else
+			fsd = dup(STDIN_FILENO);
+	}
+	if (fsd < 0) {
+		perror(fs);
+		exit(1);
+	}
+
 	n = read(fd, &head, sizeof(head));
 	if (n < sizeof(head)) {
 		fprintf(stderr, "%s: reading header\n", file);
@@ -179,7 +200,7 @@ main(int argc, char *argv[])
 		fprintf(stderr, "copying root image...\n");
 
 	if (xflag) {
-		n = write(STDOUT_FILENO, dataseg + rd_root_image_off,
+		n = write(fsd, dataseg + rd_root_image_off,
 		    rd_root_size_val);
 		if (n != rd_root_size_val) {
 			perror("write");
@@ -188,7 +209,7 @@ main(int argc, char *argv[])
 	} else {
 		struct stat sstat;
 
-		if (fstat(STDIN_FILENO, &sstat) == -1) {
+		if (fstat(fsd, &sstat) == -1) {
 			perror("fstat");
 			exit(1);
 		}
@@ -197,7 +218,7 @@ main(int argc, char *argv[])
 			fprintf(stderr, "ramdisk too small\n");
 			exit(1);
 		}
-		n = read(STDIN_FILENO, dataseg + rd_root_image_off,
+		n = read(fsd, dataseg + rd_root_image_off,
 		    rd_root_size_val);
 		if (n < 0) {
 			perror("read");
@@ -270,6 +291,6 @@ usage(void)
 {
 	extern char *__progname;
 
-	fprintf(stderr, "usage: %s [-dx] file_name\n", __progname);
+	fprintf(stderr, "usage: %s [-dx] bsd [fs]\n", __progname);
 	exit(1);
 }