gpg failed to sign the data fatal: failed to write commit object [Git 2.10.0]

Question

I followed few articles over the pretty attributes on Git 2.10 release note. Going through which upgraded the git to 2.10.0 and made changes to global .gitconfig

Answer 1

None of the above answers seemed to match my problem. My gpg binary (/usr/local/bin/gpg -> /usr/local/MacGPG2/bin/gpg2) was installed as part of GPG Suite, rather than by brew.

Nevertheless, I felt that the advice boiled down to: "use whichever gpg binary is the latest available on brew". So I tried:

brew update
brew upgrade git
brew install gpg

# the following are suggestions from brew's Caveats, to make `/usr/local/bin/gpg`
# point to the brew binary:
rm '/usr/local/bin/gpg'
brew link --overwrite gnupg2

I verified that I had correctly changed the gpg upon my $PATH to point to the new executable from brew: