angular-cli npm install results in errors making it not suitable for CI builds. #2599

Please provide us with the following information:

OS?

Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)
Win8.1

Versions.

Please run ng --version. If there's nothing outputted, please run in a Terminal: node --version and paste the result here:
angularcli- 1.0.0-beta.15
node - 6.7.0
OS- Win 32 x64

Repro steps.

Was this an app that wasn't created using the CLI? What change did you do on your code? etc.
yes, we are trying to create an app using CLI. While doing npm install, we get a few errors due to connection to github. We being behind an corporate firewall, use proxies to download all contents.
everything else works fine, but the angular-cli. That too, these new errors started coming with .16 and .17.
steps.

1. have angular-cli.1.0.0-beta.16 or .17 in your package.json
2. do npm install from behind a firewall (using proxies)

The log given by the failure.

Normally this include a stack trace and some more information.

<proj path>npm install -g angular-cli@latest
npm WARN addRemoteGit Error: Command failed: git -c core.longpaths=true config --get remote.origin.url
npm WARN addRemoteGit
npm WARN addRemoteGit     at ChildProcess.exithandler (child_process.js:206:12)
npm WARN addRemoteGit     at emitTwo (events.js:106:13)
npm WARN addRemoteGit     at ChildProcess.emit (events.js:191:7)
npm WARN addRemoteGit     at maybeClose (internal/child_process.js:877:16)
npm WARN addRemoteGit     at Socket.<anonymous> (internal/child_process.js:334:11)
npm WARN addRemoteGit     at emitOne (events.js:96:13)
npm WARN addRemoteGit     at Socket.emit (events.js:188:7)
npm WARN addRemoteGit     at Pipe._handle.close [as _onclose] (net.js:493:12)
npm WARN addRemoteGit  webpack/compression-webpack-plugin#<random number> resetting remot
e <userDirectory>\AppData\Roaming\npm-cache\_git-remotes\git-github-com-webpack-compression-webpack-plugi
n-git-<random hash number> because of error: { Error: Command failed: git -c core.lon
gpaths=true config --get remote.origin.url
npm WARN addRemoteGit
npm WARN addRemoteGit     at ChildProcess.exithandler (child_process.js:206:12)
npm WARN addRemoteGit     at emitTwo (events.js:106:13)
npm WARN addRemoteGit     at ChildProcess.emit (events.js:191:7)
npm WARN addRemoteGit     at maybeClose (internal/child_process.js:877:16)
npm WARN addRemoteGit     at Socket.<anonymous> (internal/child_process.js:334:11)
npm WARN addRemoteGit     at emitOne (events.js:96:13)
npm WARN addRemoteGit     at Socket.emit (events.js:188:7)
npm WARN addRemoteGit     at Pipe._handle.close [as _onclose] (net.js:493:12)
npm WARN addRemoteGit   killed: false,
npm WARN addRemoteGit   code: 1,
npm WARN addRemoteGit   signal: null,
npm WARN addRemoteGit   cmd: 'git -c core.longpaths=true config --get remote.origin.url' }
npm ERR! git clone --template=<user_directory>\AppData\Roaming\npm-cache\_git-remotes\_templates --mirror
git://github.com/webpack/compression-webpack-plugin.git <user_directory>\AppData\Roaming\npm-cache\_git-re
motes\git-github-com-webpack-compression-webpack-plugin-git-<random number>: Clo
ning into bare repository '<user_directory>\AppData\Roaming\npm-cache\_git-remotes\git-github-com-webpack-
compression-webpack-plugin-git-<random hash>'...
npm ERR! git clone --template=<user_directory>\AppData\Roaming\npm-cache\_git-remotes\_templates --mirror
git://github.com/webpack/compression-webpack-plugin.git <user_directory>\AppData\Roaming\npm-cache\_git-re
motes\git-github-com-webpack-compression-webpack-plugin-git-<random_number> fat
al: unable to connect to github.com:
npm ERR! git clone --template=<user_directory>\AppData\Roaming\npm-cache\_git-remotes\_templates --mirror
git://github.com/webpack/compression-webpack-plugin.git <user_directory>\AppData\Roaming\npm-cache\_git-re
motes\git-github-com-webpack-compression-webpack-plugin-git-<random_number>: git
hub.com[0: <some_IP>]: errno=Invalid argument
npm WARN deprecated graceful-fs@1.2.3: graceful-fs v3.0.0 and before will fail on node releases >= v7.0. Please up
date to graceful-fs@^4.0.0 as soon as possible. Use 'npm ls graceful-fs' to find it in the tree.
npm WARN deprecated minimatch@2.0.10: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated lodash-node@2.4.1: This package is discontinued. Use lodash@^4.0.0.
npm WARN deprecated minimatch@0.3.0: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated tough-cookie@2.2.2: ReDoS vulnerability parsing Set-Cookie https://nodesecurity.io/advisories/
13

### Mention any other details that might be useful.
Please at let us know what exactly changed in .16 and .17 where npm install is impacted. It is now asking git to be installed and available in PATH and then above mentioned errors. We use Bamboo for our CI, and the moment our npm install task fails with an error, it stops building our application.
> ---------------------------------------------------------------
> Thanks! We'll be in touch soon.