On Tue, May 12, 2009 at 10:35:30PM +0800, Ping Yin wrote:
> a----b
> \----c
>
> Given the graph above, I want to create a commit b1 on top of c, where
> b1 and b have the same content. i.e.
>
> a----b
> \----c----b1 ( content(b) == content(b1) )
>
> If there are no untracked files in the working directory, i can do
>
> git checkout b
> git reset c
> git add .
> git commit -m "the copy of b"
>
> Is there any simpler way? And if there are untracked files in the
> working directory, how to do it?
You can just munge the index directly, and skip the working tree
entirely:
rm .git/index
git read-tree b
git commit -m 'the copy of b'
You would probably want to "git checkout -f" afterwards to update the
working tree with what's in the index.
You can also do it without even touching the index by using the commit
plumbing:
echo 'copy of b' >message
tree=`git rev-parse b^{tree}`
commit=`git commit-tree $tree -p c <message`
git update-ref c $commit
-Peff
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