Re: Kernel headers git tree

David Woodhouse [off-list ref] writes:

On Thu, 2006-07-13 at 17:39 -0700, Junio C Hamano wrote:

quoted

With modern enough git, you can rewrite
        KBUILDSHA=`git ls-tree $TREE -- Kbuild | cut -f3 -d\  | cut -f1`
with
        KBUILDSHA1=`git rev-parse $TREE:Kbuild`

Aha. Thanks.

quoted

I am not sure what function incparent() is trying to do with
this:

        git rev-list --max-count=1 --topo-order $1 -- . 

Find the latest ancestor commit which actually changed any files. The
first script has a similar line, except that it finds the latest
ancestor which changed anything in include/

Consider a kernel tree with commits A-->B-->C-->D, of which only A and C
change anything in include/ and in fact only C actually changes the
_exported_ headers after the unifdef and sed bits. 

The first script (extract-khdrs-git.sh) creates a 'stage1' branch which
only contains commits A'-->C', with the _exported_ header tree for each.

The second script (extract-khdrs-stage2.sh) then creates the master
branch with the same tree objects, but omitting the commits which don't
change anything. So it contains only commit C''

I guess what I was getting at was if you can avoid creating
commits that do not change anything from previous in stage1
branch, you do not have to do this, but I haven't studied stage1
script deeply enough.