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Implement a '-f' flag to teach bsdlabel to work on files instead of

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disk partitions.
This commit is contained in:
Luigi Rizzo 2004-03-30 23:15:03 +00:00
parent a6b03f428a
commit 7747c959fa
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=127650
2 changed files with 52 additions and 13 deletions
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26
sbin/bsdlabel/bsdlabel.8
View File

@ -44,38 +44,44 @@
.Sh SYNOPSIS
.Nm
.Op Fl A
.Ar disk
.Op Fl f
.Ar disk/file
.Nm
.Fl w
.Op Fl \&An
.Op Fl B Op Fl b Ar boot
.Op Fl m Ar machine
.Ar disk
.Op Fl f
.Ar disk/file
.Op Ar type
.Nm
.Fl e
.Op Fl \&An
.Op Fl B Op Fl b Ar boot
.Op Fl m Ar machine
.Ar disk
.Op Fl f
.Ar disk/file
.Nm
.Fl R
.Op Fl \&An
.Op Fl B Op Fl b Ar boot
.Op Fl m Ar machine
.Ar disk protofile
.Op Fl f
.Ar disk/file protofile
.Sh DESCRIPTION
The
.Nm
utility
installs, examines or modifies the
.Bx
label on a disk partition.
label on a disk partition, or on a file containing a partition image.
In addition,
.Nm
can install bootstrap code.
.Ss Disk Device Name
When specifying the device,
When specifying the device (i.e. when the
.Fl f
option is not used),
the
.Pa /dev/
path prefix may be omitted;
@ -91,8 +97,14 @@ label.
If the option is not given, suitable values are set for these fields.
.Pp
The
.Fl f
option tells
.Nm
that the program will operate on a file instead of a disk partition.
.Pp
The
.Fl n
stops the
option stops the
.Nm
program right before the disk would have been modified, and displays
the result instead of writing it.

39
sbin/bsdlabel/bsdlabel.c
View File

@ -139,6 +139,7 @@ enum {
static int disable_write; /* set to disable writing to disk label */
static int is_file; /* work on a file (abs. pathname), "-f" opt. */
int
main(int argc, char *argv[])
@ -147,7 +148,7 @@ main(int argc, char *argv[])
int ch, error = 0;
char const *name = 0;
while ((ch = getopt(argc, argv, "ABb:em:nRrs:w")) != -1)
while ((ch = getopt(argc, argv, "ABb:efm:nRrs:w")) != -1)
switch (ch) {
case 'A':
allfields = 1;
@ -158,6 +159,9 @@ main(int argc, char *argv[])
case 'b':
xxboot = optarg;
break;
case 'f':
is_file=1;
break;
case 'm':
if (!strcmp(optarg, "i386") ||
!strcmp(optarg, "amd64") ||
@ -213,7 +217,9 @@ main(int argc, char *argv[])
errx(1, "a -m <architecture> option must be specified");
/* Figure out the names of the thing we're working on */
if (argv[0][0] != '/') {
if (is_file) {
dkname = specname = argv[0];
} else if (argv[0][0] != '/') {
dkname = argv[0];
asprintf(&specname, "%s%s", _PATH_DEV, argv[0]);
} else {
@ -393,6 +399,10 @@ writelabel(void)
fd = open(specname, O_RDWR);
if (fd < 0) {
if (is_file) {
warn("cannot open file %s for writing label", specname);
return(1);
}
grq = gctl_get_handle();
gctl_ro_param(grq, "verb", -1, "write label");
gctl_ro_param(grq, "class", -1, "BSD");
@ -431,6 +441,21 @@ writelabel(void)
return (0);
}
static void
get_file_parms(int f)
{
int i;
struct stat sb;
if (fstat(f, &sb) != 0)
err(4, "fstat failed");
i = sb.st_mode & S_IFMT;
if (i != S_IFREG && i != S_IFLNK)
errx(4, "%s is not a valid file or link", specname);
secsize = DEV_BSIZE;
mediasize = sb.st_size;
}
/*
* Fetch disklabel for disk.
* Use ioctl to get label unless -r flag is given.
@ -446,8 +471,9 @@ readlabel(int flag)
f = open(specname, O_RDONLY);
if (f < 0)
err(1, specname);
/* New world order */
if ((ioctl(f, DIOCGMEDIASIZE, &mediasize) != 0) ||
if (is_file)
get_file_parms(f);
else if ((ioctl(f, DIOCGMEDIASIZE, &mediasize) != 0) ||
(ioctl(f, DIOCGSECTORSIZE, &secsize) != 0)) {
err(4, "cannot get disk geometry");
}
@ -1329,8 +1355,9 @@ getvirginlabel(void)
return (NULL);
}
/* New world order */
if ((ioctl(f, DIOCGMEDIASIZE, &mediasize) != 0) ||
if (is_file)
get_file_parms(f);
else if ((ioctl(f, DIOCGMEDIASIZE, &mediasize) != 0) ||
(ioctl(f, DIOCGSECTORSIZE, &secsize) != 0)) {
close (f);
return (NULL);