git+ssh installs fail with GitHub URLs with colon separators

[epmatsw]

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

Bug

What is the current behavior?
When installing from a git url (after having the fix in #2384), the install fails with:

yarn install v0.19.0-20170106.1725
info No lockfile found.
[1/4] 🔍  Resolving packages...
error Command failed.
Exit code: 128
Command: git
Arguments: clone ssh://[email protected]:githubuser/repo.git /Users/username/Library/Caches/Yarn/.tmp/bff4d24c292f2c5f1a876330de56ef81
Directory: /Users/username/project
Output:
Cloning into '/Users/username/Library/Caches/Yarn/.tmp/bff4d24c292f2c5f1a876330de56ef81'...
ssh: Could not resolve hostname github.com:githubuser: nodename nor servname provided, or not known
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.

If the current behavior is a bug, please provide the steps to reproduce.

It appears that any git url that uses : rather than / for the separator between the url and github user/org still fails even with the fix.

See comments in #2384 1 2 3

What is the expected behavior?
The install succeeds without errors.

Please mention your node.js, yarn and operating system version.
Node 7.4.0, yarn 0.19.0, macOS 10.12.2

[chrisirhc]

Related to #573 (comment) . Seems that a custom resolver needs to be set up to handle the : behavior.