Add the undocumented -R option to disable randomness for regression-testing.

Add a couple of simple regression tests accessible with "make test", they
depend on the md(4) driver.

FYI I have also tried running the test against a week old newfs and it
passed.

sbin/newfs/Makefile

@@ -7,3 +7,9 @@ WARNS?=	2
 MAN=	newfs.8
 
 .include <bsd.prog.mk>
+
+test:	${PROG}
+	sh ${.CURDIR}/runtest01.sh 
+	sh ${.CURDIR}/runtest00.sh | tee _.test
+	diff --ignore-matching-lines=FreeBSD _.test ${.CURDIR}/ref.test
+	echo All Tests Passed

sbin/newfs/mkfs.c

@@ -123,8 +123,11 @@ mkfs(struct partition *pp, char *fsys, int fi, int fo)
 	int width;
 	char tmpbuf[100];	/* XXX this will break in about 2,500 years */
 
-	time(&utime);
-	if (!randinit) {
+	if (Rflag)
+		utime = 1000000000;
+	else 
+		time(&utime);
+	if (!Rflag && !randinit) {
 		randinit = 1;
 		srandomdev();
 	}

sbin/newfs/newfs.c

@@ -148,6 +148,7 @@ static struct disklabel *getdisklabel(char *s, int fd);
 
 int	Nflag;			/* run without writing file system */
 int	Oflag;			/* format as an 4.3BSD file system */
+int	Rflag;			/* regression test */
 int	Uflag;			/* enable soft updates for file system */
 int	fssize;			/* file system size */
 int	ntracks = NTRACKS;	/* # tracks/cylinder */
@@ -209,7 +210,7 @@ main(int argc, char *argv[])
 		progname = *argv;
 
 	while ((ch = getopt(argc, argv,
-	    "NOS:T:Ua:b:c:d:e:f:g:h:i:k:l:m:n:o:p:r:s:t:u:vx:")) != -1)
+	    "NORS:T:Ua:b:c:d:e:f:g:h:i:k:l:m:n:o:p:r:s:t:u:vx:")) != -1)
 		switch (ch) {
 		case 'N':
 			Nflag = 1;
@@ -217,6 +218,9 @@ main(int argc, char *argv[])
 		case 'O':
 			Oflag = 1;
 			break;
+		case 'R':
+			Rflag = 1;
+			break;
 		case 'S':
 			if ((sectorsize = atoi(optarg)) <= 0)
 				fatal("%s: bad sector size", optarg);
@@ -596,6 +600,7 @@ usage()
 	fprintf(stderr,
 	    "\t-N do not create file system, just print out parameters\n");
 	fprintf(stderr, "\t-O create a 4.3BSD format filesystem\n");
+	fprintf(stderr, "\t-R regression test, supress random factors\n");
 	fprintf(stderr, "\t-S sector size\n");
 #ifdef COMPAT
 	fprintf(stderr, "\t-T disktype\n");

sbin/newfs/newfs.h

@@ -39,6 +39,7 @@
  */
 extern int	Nflag;		/* run mkfs without writing file system */
 extern int	Oflag;		/* format as an 4.3BSD file system */
+extern int	Rflag;		/* regression test */
 extern int	Uflag;		/* enable soft updates for file system */
 extern int	fssize;		/* file system size */
 extern int	ntracks;	/* # tracks/cylinder */

sbin/newfs/ref.test

@@ -0,0 +1,7 @@
+# $FreeBSD$
+ba20315918bf2d2885eed49fee03e3ca
+e2170dc5d6bd192f85da9d1085550265
+510df6ee7aadd7a5477b47c1a967e8db
+47a1a6afcd21c166f32027020b0b6a7e
+6e3b83f554b0216206a2768f8b01d9a1
+f6035a903644e118f09c6041fb29f7ce

sbin/newfs/runtest00.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+# $FreeBSD$
+
+set -e
+
+MD=99
+(
+for s in 1m 4m 60m 120m 240m 1g
+do
+	(
+	mdconfig -d -u $MD || true
+	mdconfig -a -t malloc -s $s -u $MD
+	disklabel -r -w md$MD auto
+	./newfs -R /dev/md${MD}c
+	) 1>&2
+	md5 < /dev/md${MD}c
+done
+mdconfig -d -u $MD 1>&2 || true
+) 

sbin/newfs/runtest01.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+# $FreeBSD$
+
+set -e
+
+MD=99
+ME=98
+s=1m
+mdconfig -d -u $MD || true
+mdconfig -d -u $ME || true
+mdconfig -a -t malloc -s $s -u $MD
+mdconfig -a -t malloc -s $s -u $ME
+disklabel -r -w md$MD auto
+disklabel -r -w md$ME auto
+./newfs -R /dev/md${MD}c
+./newfs -R /dev/md${ME}c
+if cmp /dev/md${MD}c /dev/md${ME}c ; then
+	echo "Test passed"
+	e=0
+else
+	echo "Test failed"
+	e=1
+fi
+mdconfig -d -u $MD || true
+mdconfig -d -u $ME || true
+exit $e
+