envirius

envirius — universal virtual environments manager.

Features

Usually this kind of tools narrowly specialized for a particular programming language. For example:

• virtualenv for python
• rvm for ruby
• kerl for erlang
• nvm/nodeenv for node.js
• and so on

But there are many cases when in one and the same environment you must have more than one programming language. For example, to create an environment with python2.6 and node.js 0.10.24. This idea underlies envirius.

Support for new programming languages are implemented as plug-ins.

Installation

At first:

$ git clone https://github.com/ekalinin/envirius.git
$ cd envirius
$ make install

Then youd need to add into your .bashrc the following:

# activate envirius itself
# (mandatory part)
if [ -e "$HOME/.envirius/nv" ] ; then
    . ~/.envirius/nv
fi

# auto environment activation
# when navigate to folder with '.envirius' file
# (optional part)
if [ -e ".envirius" ] && [ -f ".envirius" ]; then
    nv on `cat .envirius`
fi

Available plugins

You can create environments for the following programming languages at the moment:

• erlang
• rust
• elixir
• julia
• node.js
• python
• go

Usage

To check available plugins:

➥ nv ls-plugins
elixir
erlang
go
julia
node
python
rust

To check available versions for each plugin:

➥ nv ls-versions --rust --erlang
* rust:
0.1         0.2         0.3         0.4         0.5
0.6         0.7         0.8         0.9
* erlang:
R10B-0    R10B-10   R10B-1a   R10B-2    R10B-3    R10B-4
R10B-5    R10B-6    R10B-7    R10B-8    R10B-9    R11B-0
R11B-1    R11B-2    R11B-3    R11B-4    R11B-5    R12B-0
R12B-1    R12B-2    R12B-3    R12B-4    R12B-5    R13A
R13B      R13B01    R13B02-1  R13B02    R13B03    R13B04
R14A      R14B      R14B01    R14B02    R14B03    R14B04
R15B      R15B01    R15B02    R15B02    R15B03-1  R15B03
R16A      R16B      R16B01    R16B02    R16B03-1  R16B03
17.0-rc1

To create an environment:

➥ nv mk mixed-rust-erlang --rust=0.9 --erlang=17.0-rc1
Creating environment: mixed-rust-erlang ...
 * installing rust==0.9 ...
 * done (in 5 secs.)
 * installing erlang==17.0-rc1 ...
 * done (in 11 secs.)

Get list of the environments:

➥ nv ls
Available environment(s):
mixed-rust-erlang
rust-0.9
erl-17-rc1

To activate environment:

➥ nv on mixed-rust-erlang
Environment mixed-rust-erlang activated.

To check if environment activated:

(mixed-rust-erlang) ➥ nv current
mixed-rust-erlang

To deactivate environment:

(mixed-rust-erlang) ➥ nv off
Environment mixed-rust-erlang was deactivated.

How to add a plugin?

All plugins are in the directory nv-plugins. If you need a new one you should add it inside this directory.

Mandatory elements

In the simplest case you need to implement 2 functions in the plugin's body:

• plug_list_versions which returns list of available versions of the plugin
• plug_url_for_download which returns full url for downloading tarball

If installation is not typical then you should implement plug_install instead of plug_url_for_download. Default implementation of the plug_install function is in the src/nv-commands/mk file.

Optional elements

• plug_list_versions_columns_count — variable — number of the columns in the output of the nv ls-version for each plugin
• plug_list_versions_columns_size — variable — each column width in chars in the output of the nv ls-version for each plugin
• plug_post_install_actions — optional function — executes after installation. For example pip installation in the python plugin
• plug_state — variable — if == disabled then plugin is not active and will not be account in the commands:
  • mk
  • ls-versions
  • ls-plugins

Examples

• Simple: erlang
• Own impementation: go

Example of the usage

Here is an example of building hugo static site generator under envirius with go plugin:

$ whereis go
go:
$ nv mk go-hudo-test --go=1.2.1
Creating environment: go-hudo-test ...
 * installing go==1.2.1 ...
 * done (in 8 secs.)
$ nv ls 
Available environment(s):
go-hudo-test (go==1.2.1)
$ nv on go-hudo-test
(go-hudo-test) $ go get github.com/spf13/hugo
(go-hudo-test) $ cd $GOPATH/src/github.com/spf13/hugo
(go-hudo-test) $ go build -o hugo main.go
(go-hudo-test) $ cd -
(go-hudo-test) $ hugo version
Hugo Static Site Generator v0.11-dev

Dependencies

• bash
• curl / wget
• tar
• git
• gcc
• bats

Supported OS

• ubuntu

Tests

Most of the code is covered by tests. For testing bats was used. To run tests:

➥ make tests
...

22 tests, 0 failures

Version History

See CHANGELOG.md.

License

See LICENSE.