Performs various checks before installing the gem such as the install repository is writable and its directories exist, required Ruby and rubygems versions are met and that dependencies are installed.
Version and dependency checks are skipped if this install is forced.
The dependent check will be skipped if the install is ignoring dependencies.
Installs from the gem dependencies files in the :gemdeps option in options, yielding to the block as in install.
If :without_groups is given in the options, those groups in the gem dependencies file are not used. See Gem::Installer for other options.
Default options for the gem install and update commands.
Looks up the latest specification for dependency and adds it to the always_install list.
Returns true if this gem is installable for the current platform.
Returns true if this gem is installable for the current platform.
Returns true if this specification is installable on this platform.
Returns true if the document is valid with all lines removed. By default it checks all blocks in present in the frontier array, but can be used for arbitrary arrays of codeblocks as well
Add the install/update options to the option parser.