[SR-966] Report git error too old if git version is < 2 when a git error occurs

[mxcl]

Previous ID	SR-966
Radar	None
Original Reporter	@mxcl
Type	Bug
Status	Resolved
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	Package Manager
Labels	Bug, StarterBug
Assignee	kkoval (JIRA)
Priority	Medium

md5: d4481dd05f2ca1035f825e02b80ca8a6

Issue Description:

NT

[modocache]

Here's an example of a user running into a problem when using SwiftPM with an old version of Git (prior to 2.0): http://stackoverflow.com/questions/36023869/intra-package-module-dependencies/36067974#36067974

[swift-ci]

Comment by Kostiantyn Koval (JIRA)

Here is also more info about that issue. https://lists.swift.org/pipermail/swift-users/Week-of-Mon-20160314/001456.html

[modocache]

Addressed in #201

[swift-ci]

Comment by Kostiantyn Koval (JIRA)

Swift CI on Ubuntu 14.04 is failing because it has git `1.9.1`
"-C <change path>" option was added in `1.8.5`
Are there any other reason why we require git > 2.0