Re: building Rootfs

[David VomLehn <dvomlehn@cisco.com>]

Linus Walleij wrote:
> If you know some way of sneaking a device node into a
> .tar file created ENTIRELY running as a regular user,
> tell me!

We do this all the time. We have a very minimal root filesystem and aren't 
currently using any of the frameworks for building root filesystems, so 
everything is done with make. In general, we create tar files for each piece. The 
piece that has device nodes has a make file with something like:

	all:
		fakeroot make fakeroot-package

	fakeroot-package:
		mkdir -p image
		mknod image/dev/null c 1 3
		mknod image/dev/random c 1 8
		tar -C image -czf image.tgz .

We ran into some issues when we separated running mknod and tar into separate 
fakeroot invocations because there is a bug in fakeroot with exporting and 
importing its state. Fortunately, doing all of this under a single fakeroot 
command works just fine. When we untar the tar files for all of the pieces to 
create a root filesystem image and then run mkcramfs to create a CRAMFS image, we 
do all commands under a single invocation of fakeroot.

No stage of the build requires running as root.
-- 
David VomLehn, dvomlehn@cisco.com




     - - - - -                              Cisco                            - - - - -         
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