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mkimg: Add -C argument to specify maximum capacity

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Add a -C option to specify a maximum capacity for the final image file.
It is useful to control the size of the generated image for sdcard or
when we will add dynamic size partition.

Add --capacity which is a shorthand to define min and max capacity at
the same time.

Reviewed by:	bapt, marcel, wblock (manpages)
Sponsored by:	Gandi.net
Differential Revision:	https://reviews.freebsd.org/D10509
This commit is contained in:
Emmanuel Vadot 2017-05-10 09:36:34 +00:00
parent 554e6778b6
commit 2dcfca637d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=318137
2 changed files with 53 additions and 16 deletions
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18
usr.bin/mkimg/mkimg.1
View file

@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd August 7, 2015
.Dd April 26, 2017
.Dt MKIMG 1
.Os
.Sh NAME
@ -37,7 +37,9 @@
.Op Fl S Ar secsz
.Op Fl T Ar tracksz
.Op Fl b Ar bootcode
.Op Fl c Ar capacity
.Op Fl c Ar min_capacity
.Op Fl C Ar max_capacity
.Op Fl -capacity Ar capacity
.Op Fl f Ar format
.Op Fl o Ar outfile
.Op Fl a Ar active
@ -125,6 +127,18 @@ given capacity, then the disk image will be larger than the capacity
given.
.Pp
The
.Fl C
option specifies a maximum capacity for the disk image.
If the combined sizes of the given partitions exceed the size given with
.Fl C ,
image creation fails.
.Pp
The
.Fl -capacity
option is a shorthand to specify the minimum and maximum capacity at the
same time.
.Pp
The
.Fl v
option increases the level of output that the
.Nm

51
usr.bin/mkimg/mkimg.c
View file

@ -27,6 +27,7 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/stat.h>
#include <errno.h>
#include <err.h>
@ -46,18 +47,21 @@ __FBSDID("$FreeBSD$");
#include "mkimg.h"
#include "scheme.h"
#define LONGOPT_FORMATS 0x01000001
#define LONGOPT_SCHEMES 0x01000002
#define LONGOPT_VERSION 0x01000003
#define LONGOPT_FORMATS 0x01000001
#define LONGOPT_SCHEMES 0x01000002
#define LONGOPT_VERSION 0x01000003
#define LONGOPT_CAPACITY 0x01000004
static struct option longopts[] = {
{ "formats", no_argument, NULL, LONGOPT_FORMATS },
{ "schemes", no_argument, NULL, LONGOPT_SCHEMES },
{ "version", no_argument, NULL, LONGOPT_VERSION },
{ "capacity", required_argument, NULL, LONGOPT_CAPACITY },
{ NULL, 0, NULL, 0 }
};
static uint64_t capacity;
static uint64_t min_capacity = 0;
static uint64_t max_capacity = 0;
struct partlisthead partlist = TAILQ_HEAD_INITIALIZER(partlist);
u_int nparts = 0;
@ -148,7 +152,8 @@ usage(const char *why)
fputc('\n', stderr);
fprintf(stderr, "\t-a <num>\t- mark num'th partion as active\n");
fprintf(stderr, "\t-b <file>\t- file containing boot code\n");
fprintf(stderr, "\t-c <num>\t- capacity (in bytes) of the disk\n");
fprintf(stderr, "\t-c <num>\t- minimum capacity (in bytes) of the disk\n");
fprintf(stderr, "\t-C <num>\t- maximum capacity (in bytes) of the disk\n");
fprintf(stderr, "\t-f <format>\n");
fprintf(stderr, "\t-o <file>\t- file to write image into\n");
fprintf(stderr, "\t-p <partition>\n");
@ -378,12 +383,17 @@ mkimg_chs(lba_t lba, u_int maxcyl, u_int *cylp, u_int *hdp, u_int *secp)
static int
capacity_resize(lba_t end)
{
lba_t capsz;
lba_t min_capsz, max_capsz;
capsz = (capacity + secsz - 1) / secsz;
if (end >= capsz)
min_capsz = (min_capacity + secsz - 1) / secsz;
max_capsz = (max_capacity + secsz - 1) / secsz;
if (max_capsz != 0 && end > max_capsz)
return (ENOSPC);
if (end >= min_capsz)
return (0);
return (image_set_size(capsz));
return (image_set_size(min_capsz));
}
static void
@ -470,7 +480,7 @@ main(int argc, char *argv[])
bcfd = -1;
outfd = 1; /* Write to stdout by default */
while ((c = getopt_long(argc, argv, "a:b:c:f:o:p:s:vyH:P:S:T:",
while ((c = getopt_long(argc, argv, "a:b:c:C:f:o:p:s:vyH:P:S:T:",
longopts, NULL)) != -1) {
switch (c) {
case 'a': /* ACTIVE PARTITION, if supported */
@ -485,10 +495,15 @@ main(int argc, char *argv[])
if (bcfd == -1)
err(EX_UNAVAILABLE, "%s", optarg);
break;
case 'c': /* CAPACITY */
error = parse_uint64(&capacity, 1, INT64_MAX, optarg);
case 'c': /* MINIMUM CAPACITY */
error = parse_uint64(&min_capacity, 1, INT64_MAX, optarg);
if (error)
errc(EX_DATAERR, error, "capacity in bytes");
errc(EX_DATAERR, error, "minimum capacity in bytes");
break;
case 'C': /* MAXIMUM CAPACITY */
error = parse_uint64(&max_capacity, 1, INT64_MAX, optarg);
if (error)
errc(EX_DATAERR, error, "maximum capacity in bytes");
break;
case 'f': /* OUTPUT FORMAT */
if (format_selected() != NULL)
@ -559,6 +574,12 @@ main(int argc, char *argv[])
print_version();
exit(EX_OK);
/*NOTREACHED*/
case LONGOPT_CAPACITY:
error = parse_uint64(&min_capacity, 1, INT64_MAX, optarg);
if (error)
errc(EX_DATAERR, error, "capacity in bytes");
max_capacity = min_capacity;
break;
default:
usage("unknown option");
}
@ -568,8 +589,10 @@ main(int argc, char *argv[])
usage("trailing arguments");
if (scheme_selected() == NULL && nparts > 0)
usage("no scheme");
if (nparts == 0 && capacity == 0)
if (nparts == 0 && min_capacity == 0)
usage("no partitions");
if (max_capacity != 0 && min_capacity > max_capacity)
usage("minimum capacity cannot be larger than the maximum one");
if (secsz > blksz) {
if (blksz != 0)