Document the -y option as a unit test option.

Add missing -v (and -y) to the usage message.

Requested by: eadler@

2 files changed, 15 insertions, 2 deletions

diff --git a/usr.bin/mkimg/mkimg.1 b/usr.bin/mkimg/mkimg.1
index 0ed0dac..ed14cc8 100644
--- a/usr.bin/mkimg/mkimg.1
+++ b/usr.bin/mkimg/mkimg.1
@@ -24,12 +24,12 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 2, 2014
+.Dd July 4, 2014
 .Dt MKIMG 1
 .Os
 .Sh NAME
 .Nm mkimg
-.Nd "utility to make a disk image"
+.Nd "utility to make disk images"
 .Sh SYNOPSIS
 .Nm
 .Op Fl H Ar heads
@@ -40,6 +40,7 @@
 .Op Fl f Ar format
 .Op Fl o Ar outfile
 .Op Fl v
+.Op Fl y
 .Fl s Ar scheme
 .Fl p Ar partition
 .Op Fl p Ar partition ...
@@ -111,6 +112,16 @@ option increases the level of output that the
 .Nm
 utility prints.
 .Pp
+The
+.Op Fl y
+option is used for testing purposes only and is not to be used in production.
+When present, the
+.Nm
+utility will generate predictable values for Universally Unique Identifiers
+(UUIDs) and time stamps so that consecutive runs of the
+.Nm
+utility will create images that are identical.
+.Pp
 For a complete list of supported partitioning schemes or supported output
 format, or for a detailed description of how to specify partitions, run the
 .Nm
diff --git a/usr.bin/mkimg/mkimg.c b/usr.bin/mkimg/mkimg.c
index edfd1f5..4513e66 100644
--- a/usr.bin/mkimg/mkimg.c
+++ b/usr.bin/mkimg/mkimg.c
@@ -75,6 +75,8 @@ usage(const char *why)
 	fprintf(stderr, "\t-o <file>\t-  file to write image into\n");
 	fprintf(stderr, "\t-p <partition>\n");
 	fprintf(stderr, "\t-s <scheme>\n");
+	fprintf(stderr, "\t-v\t\t-  increase verbosity\n");
+	fprintf(stderr, "\t-y\t\t-  [developers] enable unit test\n");
 	fprintf(stderr, "\t-H <num>\t-  number of heads to simulate\n");
 	fprintf(stderr, "\t-P <num>\t-  physical sector size\n");
 	fprintf(stderr, "\t-S <num>\t-  logical sector size\n");