Re: Patch generation

[George Anzinger <george@mvista.com>]

Dan Aloni wrote:
> 
> On Thu, 9 Nov 2000, Ivan Passos wrote:
> 
> > Where in the src tree can I find (or what is) the command to generate a
> > patch file from two Linux kernel src trees, one being the original and the
> > other being the newly changed one??
> 
> The syntex looks like this one:
> 
> diff -urN old_tree new_tree > your_patch_file
> 
> > I've tried 'diff -ruN', but that does diff's on several files that could
> > stay out of the comparison (such as the files in include/config, .files,
> > etc.).
> 
> You can use the --exclude switch of diff, or make mrproper before you
> diff, or you can cp -al a clean source tree before you build the kernel
> on top of it.
> 
> Another way, is to use *one* source tree, copying the files you change -
> adding them the '.orig' extention to their name.
> 
> Then you run this script (I got it when Riel pasted it on IRC)
> 
> for i in `find ./ -name \*.orig` ; do diff -u $i `dirname $i`/`basename $i
> .orig` ; done
> 
> About the other method: cp -al is fast, creating a copy of tree without
> taking much diskspace, it copies the tree by hard linking the files.
> 
> BTW, 'patch' unlinks files before modifing so you can have lots of kernel
> trees from different releases with little diskspace waste:
> 
> [karrde@callisto ~/usr/src/kernel/work]$ ls -1
> linux-2.4.0-test10
> linux-2.4.0-test10.build
> linux-2.4.0-test11-pre1
> linux-2.4.0-test6
> 
> I did 'cp -al linux-2.4.0-test10 linux-2.4.0-test10.build', and on
> linux-2.4.0-test10.build I did 'make bzImage' and all the rest.
> 
> When Linus releasd test11-pre1 I did 'cp -al' from test10 to test11-pre1
> and patched the test11-pre1 dir with the patch Linus released. the test10
> dir remained intact.
> 
> [karrde@callisto ~/usr/src/kernel/work]$ du . -s
> 193004  .
> 
> 4 kernel trees, one after make dep ; make bzImage, and all taking together
> just 193MB, instead of about 400MB... hard links, gotta love'em.

Ok, this is cool, but suppose I have the same file linked to all these
and want to change it in all the trees, i.e. still have one file.  Is
there an editor that doesn't unlink.  Or maybe cp of the edited file?? 
How would you do this?  (I prefer EMACS, which likes to unlink.)

George
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