[Rd] Why R should never move to git

Gábor Csárdi csardi.gabor at gmail.com
Thu Jan 25 01:04:22 CET 2018

You need to create a branch from the original master, if you do
git log master
then you'll see which commit that is: f735449d679686867e7d3ab70810b09e8cea6366

So create that branch off that and switch to the new branch:
git branch keepclassx f735449d679686867e7d3ab70810b09e8cea6366
git checkout keepclassx

Then do
git log keepclass
to see the id of the new commit that you want to put on top of the new
branch: 0307ccfaa799c5257258eda89f2526347099f0d0
and cherry-pick that:
git cherry-pick 0307ccfaa799c5257258eda89f2526347099f0d0

Now you have a branch that only has the single desired commit, on top
of the original master.

You can now push you new branch to GitHub:
git push --set-upstream origin keepclassx
and then create a new pull request from this branch.


On Wed, Jan 24, 2018 at 11:56 PM, Duncan Murdoch
<murdoch.duncan at gmail.com> wrote:
> On 24/01/2018 6:35 PM, Gábor Csárdi wrote:
>> When you create a branch for your bug fix, don't create it off the
>> previous fix. Create it off the original, forked state of the repo.
> Branches keepclass2 through to keepclass5 are my attempts to do that. As far
> as I can see they are all the same as keepclass, which was branched from the
> head of the master branch of my fork.
>> Are the two commits here your fixes?
>> https://github.com/dmurdoch/manipulateWidget/commits/master
> Those are both part of the first PR.  There's a third commit in keepclass
> (and the other branches too...)
> If you or someone else tells me the magic commands I need to do what I want,
> I'll appreciate it.  But the main point of my post is that this is something
> that should be easy.  It shouldn't require expert help.  The fact that it
> does is a flaw in the design of Git or Github or both.
> Duncan Murdoch
>> Gabor
>> On Wed, Jan 24, 2018 at 11:17 PM, Duncan Murdoch
>> <murdoch.duncan at gmail.com> wrote:
>>> Lately I've been doing some work with the manipulateWidget package, which
>>> lives on Github at
>>> https://github.com/rte-antares-rpackage/manipulateWidget/.  Last week I
>>> found a bug, so being a good community member, I put together a patch.
>>> Since the package lives on Github, I followed instructions to put
>>> together a
>>> "pull request":
>>> - I forked the main branch to my own Github account as
>>> <https://github.com/dmurdoch/manipulateWidget>.
>>> - I checked out my fork into RStudio.
>>> - I fixed the bug, and submitted the pull request
>>> <https://github.com/rte-antares-rpackage/manipulateWidget/pull/47>.
>>> Then I felt good about myself, and continued on with my work.  Today I
>>> tracked down another bug, unrelated to the previous one.  I know enough
>>> about git to know that I shouldn't commit this fix to my fork, because it
>>> would then become part of the previous pull request.
>>> So I created a branch within my fork, and committed the change there. But
>>> Github provides no way to create a pull request that only includes the
>>> new
>>> stuff!  Every attempt I made would have included everything from both bug
>>> fixes.
>>> I've read online about creating a new branch based on the master copy,
>>> and
>>> "cherry picking" just the final change:  but all the instructions I've
>>> tried
>>> so far have failed.
>>> Okay, I know the solution:  I need to burn the whole thing down (to quote
>>> Jenny Bryan).  I'll just create a new fork, and put the new bug fix in a
>>> branch there.
>>> I can't!  I don't know if this is a Git restriction or a Github
>>> restriction,
>>> but it won't let me create a new fork without deleting the old one.  I
>>> don't
>>> know if deleting the previous fork would also delete the previous PR, so
>>> I'm
>>> not going to do this.
>>> This is ridiculous!  It is such an easy concept:  I want to take the diff
>>> between my most recent commit and the one before, and send that diff to
>>> the
>>> owners of the master copy.  This should be a trivial (and it is in svn).
>>> Git and Github allow the most baroque arrangements, but can't do this
>>> simple
>>> task.  That's an example of really bad UI design.
>>> Duncan Murdoch
>>> ______________________________________________
>>> R-devel at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel

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