Is it possible to cherry-pick a commit from another git repository?

Here's an example of the remote-fetch-merge.

cd /home/you/projectA
git remote add projectB /home/you/projectB
git fetch projectB

Then you can:

git cherry-pick <first_commit>..<last_commit>

or you could even merge the whole branch(only if you really need to merge everything)

git merge projectB/master

You'll need to add the other repository as a remote, then fetch its changes. From there you see the commit and you can cherry-pick it.

Like that:

git remote add other https://example.link/repository.git
git fetch other

Now you have all the information to simply do git cherry-pick.

When done, you may want to remove the remote again, if you don't need it any more, with

git remote remove other

More info about working with remotes here: https://git-scm.com/book/en/v2/Git-Basics-Working-with-Remotes

The answer, as given, is to use format-patch but since the question was how to cherry-pick from another folder, here is a piece of code to do just that:

$ git --git-dir=../<some_other_repo>/.git \
format-patch -k -1 --stdout <commit SHA> | \
git am -3 -k

Explanation from Cong Ma comment Aug 28 '14

git format-patch command creates a patch from some_other_repo's commit specified by its SHA (-1 for one single commit alone). This patch is piped to git am, which applies the patch locally (-3 means trying the three-way merge if the patch fails to apply cleanly).