BTX scripting help

[Ruslan Ermilov]

On Thu, Oct 07, 2004 at 11:00:06AM -0700, Kelly Hall wrote:
> Hi Folks,
>  
> I'm trying to automate a sequence of BTX commands and I'm hitting some
> snags.  I've got some minor forth experience, but it isn't enough.
>  
> My machine uses the standard bootloader and doesn't present a menu for
> the user.  By default, the machine boots a standard kernel and fs-image
> file and everything is happy.  Sometimes, though, I want my users to be
> able to boot an alternate kernel and fs-image.  To do this, what they do
> now is:
>   - wait for the default kernel to start loading
>   - hit the space bar
>   - BTX breaks out and gives them a prompt
>   - they type four commands:
>     - unload
>     - load /kernel
>     - load -t md_image /altfs-image
>     - boot
> I'd like to replace those four commands with one command to make things
> nicer for them.
>  
> So I tried to define the obvious forth word:
>   : altboot   unload load /kernel load -t md_image /altfs-image boot ;
> which fails to compile because /kernel isn't a word.
> 
> These all compile, but reboot when invoked
>   : altboot  unload s" /kernel" load ;   \ reboots the box
>   : altboot  unload load s" /kernel" ;   \ reboots the box
>   : altboot  unload ." /kernel" load ;   \ reboots the box
>   : altboot  unload load ." /kernel" ;   \ reboots the box
>  
> I'm stumped.  Any suggestions?
>  
Read the loader(8) manpage, it says:

BUILTIN COMMANDS
     Loader's builtin commands take its parameters from the command line.
     Presently, the only way to call them from a script is by using evaluate
     on a string.

: OK : altboot
:         s" unload" evaluate
:         s" load /boot/kernel/kernel" evaluate
:         s" lsmod" evaluate
:  ;
: OK altboot
: /boot/kernel/kernel data=0x5ce910+0x488e0 syms=[0x8+0x69798+0x8+0x56466]
:  0xfffffc0000300000: /boot/kernel/kernel (elf kernel, 0x6d6e00)
:   modules: splash.1 nfsserver.1 nfs4.1 nfs.1 if_gif.1 if_faith.1 ether.1 sysvshm.1 sysvsem.1 sysvmsg.1 cd9660.1 isa.1 pseudofs.1 procfs.1 msdosfs.1 usb.1 random.1 ppbus.1 pci.1 null.1 mpt.1 miibus.1 mem.1 ispfw.0 isp.1 sbp.1 fwe.1 firewire.1 ahc.1 ahc_pci.1 ahc_isa.1 ahc_eisa.1 cam.1 


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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