[9fans] change in boot(8): `prog' boot method.

[9fans] change in boot(8): `prog' boot method.

[Fco.J.Ballesteros]

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This change adds a new boot method: prog. The prog method simply runs
the named program. I think this can help to clean up a bit the boot process,
because at least now the same kernel can boot both from fossil (using a
script to run fs(3), venti, and fossil), from kfs, and from other file server.


Besides, I'd suggest changing all of fs(3), venti, and fossil to allow
them to get their configuration from either a environment variable
(like timezone) or a block in one of the devices they are using.  This
would save some compilations of the kernel just to change the
configuration.  Besides, there'd be no need to keep different kernels
for different configurations.

I'll do this change as well when I get some more time (I'm playing
with sections in 9load to define sections that should become the
contents of environment variables).



diff -n /n/dump/2003/0505/sys/src/9/boot /sys/src/9/boot
diff -n /n/dump/2003/0505/sys/src/9/boot/boot.h /sys/src/9/boot/boot.h
/n/dump/2003/0505/sys/src/9/boot/boot.h:72 a /sys/src/9/boot/boot.h:73,75
> extern void	configprog(Method*);
> extern int	connectprog(void);
>
diff -n /n/dump/2003/0505/sys/src/9/boot/bootmkfile /sys/src/9/boot/bootmkfile
/n/dump/2003/0505/sys/src/9/boot/bootmkfile:14 a /sys/src/9/boot/bootmkfile:15
> 	prog.$O\
Only in /sys/src/9/boot: prog.c

prog.c is attached.

hth

[-- Attachment #2: prog.c --]
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#include <u.h>
#include <libc.h>
#include <../boot/boot.h>

static char *file;

void
configprog(Method *mp)
{
	if(bootdisk != nil)
		file = bootdisk;
	else
		file = "#//boot/boot.rc";
}

int
connectprog(void)
{
	char **arg, **argp;
	int	pid;

	if(stat(file, statbuf, sizeof statbuf) < 0)
		return -1;

	print("prog %s...\n", file);
	execl(file, "boot.rc", nil);
	fatal("can't exec prog");
	return -1;
}