Change remote.origin.url from "https://..." to "git@...".

git-config-https-to-git.rb

#!/usr/bin/env ruby

url = `git config remote.origin.url`
puts "BEFORE: #{url}"

# https://[email protected]/YOURNAME/myrepo.git
if url.match(/https:\/\/([^\/@]+@)?([^\/]+)\/([^\/]+)\/(.+)\.git/)
  optional_login_name, domain, name, repo = $1, $2, $3, $4
  cmd = "git remote set-url origin git@#{domain}:#{name}/#{repo}.git"
  puts cmd
  system(cmd)
  url = `git config remote.origin.url`
  puts "AFTER: #{url}"
else
  puts "Unexpected remote.origin.url."
end

# vim: set filetype=ruby:

See http://blog.textfile.org/20141128/git/