[655] in netbsd-help mailing list archive
Re: 3c590
daemon@ATHENA.MIT.EDU (Greg Hudson)
Fri Jan 26 19:57:54 1996
To: "Douglas S. J. De Couto" <decouto@bermuda.MIT.EDU>
Cc: eford@MIT.EDU, jhawk@MIT.EDU, jcyang@ceci.MIT.EDU, netbsd-help@MIT.EDU
In-Reply-To: Your message of "Sat, 27 Jan 1996 00:22:37 GMT."
<199601270022.AAA02625@bermuda.MIT.EDU>
Date: Fri, 26 Jan 1996 19:53:23 EST
From: Greg Hudson <ghudson@MIT.EDU>
> How can you compile kernels and stuff from the afs source tree?
> doesn't the comilation try to write to the afs? I thought I would
> have to copy the source treeonto my own disk....
There are several different approaches:
* If you're currently running NetBSD 1.1 or 1.1A, you can use
union mounts. Union mounts let you transparently access a
directory with modifications going somewher else. They
exist in 1.0A, but will crash your machine. (In fact, they
may still crash your machine in 1.1 if you play around with
them too much, but they work fine for source tree and kernel
builds.) To use them, do something like:
mkdir /u1/build
mount_union -b /mit/netbsd/release/netbsd-1.1/source/src \
/u1/build
cd /u1/build/sys/arch/i386/conf
cp /my/kernel/config MYKERNELNAME
config MYKERNELNAME
cd ../compile/MYKERNELNAME
make depend
make
If you reboot your machine, you'll have to redo the union
mount each time. You can only do a union mount to local
disk; you can't do a union mount into your Athena home
directory, for instance.
* Symlink farms don't work very well with the NetBSD source
tree, but they work well enough for kernel builds. They're
not as convenient as union mounts because they don't stay
consistent with the source tree. To make a symlink farm,
do something like:
mkdir -p /u1/build/sys
cd /u1/build/sys
/usr/X11/bin/lndir /mit/netbsd/release/netbsd-1.1/source/src/sys
cd arch/i386/conf
[etc.]
* You can, of course, make a copy of the kernel source tree
(about 25MB, which you can pare down to about 8MB if you
delete all the arch subdirectories except for i386).
* We have some hacks for /mit/netbsd/dev/current-source that
let users build a kernel out of the AFS tree, but they're
deprecated now (and you shouldn't be building a kernel out
of /mit/netbsd/dev/current-source unless you know what
you're doing).
I'm planning on trying to get some changes checked in for NetBSD 1.2
to let users build both user-level programs and the kernel from a
read-only source tree.
