How can I install a local gem?

问题:

If I download a .gem file to a folder in my computer, can I install it later using gem install?

回答1:

Yup, when you do gem install, it will search the current directory first, so if your .gem file is there, it will pick it up. I found it on the gem reference, which you may find handy as well:

gem install will install the named gem. It will attempt a local installation (i.e. a .gem file in the current directory), and if that fails, it will attempt to download and install the most recent version of the gem you want.

回答2:

Also, you can use gem install --local path_to_gem/filename.gem

This will skip the usual gem repository scan that happens when you leave off --local.

You can find other magic with gem install --help.

回答3:

you can also use the full filename to your gem file:

gem install /full/path/to/your.gem

this works as well -- it's probably the easiest way

回答4:

If you create your gems with bundler:

# do this in the proper directory
bundle gem foobar

You can install them with rake after they are written:

# cd into your gem directory
rake install

Chances are, that your downloaded gem will know rake install, too.

回答5:

if you download the project file from github or other scm host site, use gem build to build the project first, so you can get a whatever.gem file in current directory. Then gem install it!

回答6:

If you want to work on a locally modified fork of a gem, the best way to do so is

gem 'pry', path: './pry'

in a Gemfile.

... where ./pry would be the clone of your repository. Simply run bundle install once, and any changes in the gem sources you make are immediately reflected. With gem install pry/pry.gem, the sources are still moved into GEM_PATH and you'll always have to run both bundle gem pry and gem update to test.

回答7:

Go to the path in where the gem is and call gem install -l gemname.gem