yarn does not run lifecycle scripts when installing from repository

[cwmoo740]

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
Installing a dependency from a git repository does not run lifecycle scripts.

If the current behavior is a bug, please provide the steps to reproduce.
https://github.com/cwmoo740/yarn-lifecycle-github

mkdir test-lifecycle
cd test-lifecycle
yarn init
yarn add git+https://git@github.com:cwmoo740/yarn-lifecycle-github.git

What is the expected behavior?
I expect it to run lifecycle scripts like NPM.

mkdir test-lifecycle
cd test-lifecycle
npm init
npm install --save git+https://git@github.com:cwmoo740/yarn-lifecycle-github.git

/**
> yarn-lifecycle-github@1.0.0 preinstall /home/cowmoo/src/test-lifecycle/node_modules/.staging/yarn-lifecycle-github-26d1bc2f
> echo 'PREINSTALL'

PREINSTALL

> yarn-lifecycle-github@1.0.0 install /home/cowmoo/src/test-lifecycle/node_modules/yarn-lifecycle-github
> echo 'INSTALL'

INSTALL

> yarn-lifecycle-github@1.0.0 postinstall /home/cowmoo/src/test-lifecycle/node_modules/yarn-lifecycle-github
> echo 'POSTINSTALL'

POSTINSTALL
*/

Please mention your node.js, yarn and operating system version.
node=v7.6.0
yarn=0.21.3
npm=4.3.0
OS=arch linux

My current project develops on our own git server and we are not allowed to publish to npm. We also have not set up a private mirror yet, so we install packages directly from our git server. Currently yarn doesn't use .npmignore or .yarnignore or any lifecycle scripts when installing from a repository, unlike npm.

The related .npmignore issue: #2090

[cwmoo740]

I made a mistake. Yarn does run preinstall, install, and postinstall for repositories, it just silences the output. Changing the scripts to "touch INSTALL" revealed this.

Feel free to close this.