Patch generation

Patch generation

[Ivan Passos]

Hello,

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??

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.).

Thanks in advance for your help.

Later,
Ivan

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Re: Patch generation

[Chmouel Boudjnah]

Ivan Passos <lists@cyclades.com> writes:

> 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??
> 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.).

use the dontdiff file from tigran with -X option of diff at :

http://www.moses.uklinux.net/patches/dontdiff

-- 
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                      --Chmouel
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Re: Patch generation

[Infamous Woodchuck]

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??
> 
> 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 are running the correct command for diff, you are just not running
'make mrproper' to clean your source tree before diffing.  :)

	Jeff




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Re: Patch generation

[Dan Aloni]

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.
 
-- 
Dan Aloni 
dax@karrde.org

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Re: Patch generation

[George Anzinger]

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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Re: Patch generation

[Dan Aloni]

On Fri, 10 Nov 2000, George Anzinger wrote:

> > 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.)

I know mcedit doesn't unlink (but mcedit kinda sucks), I think nedit
doesn't unlink too.

I prefer an editor that unlinks, since in most cases I don't want to
modify the source trees that I'm not working on, so diff can do what it's
supposed to do later.

-- 
Dan Aloni 
dax@karrde.org

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Re: Patch generation

[George Anzinger]

Dan Aloni wrote:
> 
> On Fri, 10 Nov 2000, George Anzinger wrote:
> 
> > > 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.)
> 
> I know mcedit doesn't unlink (but mcedit kinda sucks), I think nedit
> doesn't unlink too.
> 
> I prefer an editor that unlinks, since in most cases I don't want to
> modify the source trees that I'm not working on, so diff can do what it's
> supposed to do later.

Oh, I agree, but I am working on several things at once so my
development trees are cascaded, usually with a kgdb patch in all of
them.  If I make a change to kgdb, for example, it would be nice to only
have to change it once, so occasionally, I want to do it differently.

George
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Re: Patch generation

[Peter Samuelson]

  [Dan Aloni]
> > 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

That works, but see http://bugs.debian.org/64958 for my variant: a
fairly trivial diff diff that adds a flag '-k' which lets you specify
your backup suffix, then it just takes one file|dir instead of two.

  diff -urN -Xdontdiff -k.orig {source-tree}

It's been sent to Paul Eggert (of diffutils); no word so far.

[George Anzinger]
> (I prefer EMACS, which likes to unlink.)

No it doesn't, not always.  Your choice:

  (setq make-backup-files nil)
  (setq backup-by-copying t)

Peter
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Re: Patch generation

[Chmouel Boudjnah]

Peter Samuelson <peter@cadcamlab.org> writes:

> > (I prefer EMACS, which likes to unlink.)
> No it doesn't, not always.  Your choice:
>   (setq make-backup-files nil)
>   (setq backup-by-copying t)

i would recommend to use the orig.el[1] from frederic.lepied with Emacs,
it save any files before editing with a particuliar prefix and you can
generate the patch with the gendiff script (included with rpm).

Footnotes: 
[1]  ftp://ftp.chmouel.org/pub/people/chmou/orig.el

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                      --Chmouel
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Re: Patch generation

[Peter Samuelson]

[Chmouel Boudjnah <chmouel@mandrakesoft.com>]
> i would recommend to use the orig.el[1] from frederic.lepied with
> Emacs, it save any files before editing with a particuliar prefix

I'll take a look, thanks.

> and you can generate the patch with the gendiff script (included with
> rpm).

I did not know about gendiff (as a Debian user I rarely use RPM).
Anyway I prefer my patch[2] as it's more flexible.  gendiff doesn't let
you pass in other diff options (true, many are not useful in this
context but think about -d, -p, -b and -U).

Peter

[2] again, http://bugs.debian.org/64958
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