From 23574526ad0f6d2ce5ca706ea1fea78c8c29be11 Mon Sep 17 00:00:00 2001
From: Máximo Cuadros <mcuadros@gmail.com>
Date: Thu, 15 Dec 2016 09:40:48 +0100
Subject: .travis CI with multiple git versions

---
 .travis.yml | 19 +++++++++++++++++--
 Makefile    | 21 ++++++++++++++++++---
 2 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 47eaea2..c63c1c4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,14 +4,26 @@ go:
   - 1.7
   - tip
 
+env:
+  - GIT_VERSION=master
+  - GIT_VERSION=v1.9.3
+  - GIT_VERSION=v2.11.0
+
 matrix:
   allow_failures:
     - go: tip
 
+cache:
+  directories:
+  - $HOME/.git-dist
+
+before_script:
+  - export GIT_DIST_PATH=$HOME/.git-dist
+  - make build-git
 
 before_install:
   - eval "$(ssh-agent -s)"
-  # we only decrypt the SSH key when we aren't in a pull request 
+  # we only decrypt the SSH key when we aren't in a pull request
   - 'if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then bash .travis/install_key.sh; fi'
   - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then export SSH_AUTH_SOCK="" ; fi'
   - git config --global user.email "travis@example.com"
@@ -25,7 +37,10 @@ install:
   - go get -v -t ./...
 
 script:
+  - export GIT_EXEC_PATH=$GIT_DIST_PATH
+  - export PATH=$GIT_DIST_PATH:$PATH
+  - git version
   - make test-coverage
 
 after_success:
-  - bash <(curl -s https://codecov.io/bash)
+  - bash <(curl -s https://codecov.io/bash)
\ No newline at end of file
diff --git a/Makefile b/Makefile
index b9848cc..2b8aff6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,3 @@
-# Default shell
-SHELL := /bin/bash
-
 # General
 WORKDIR = $(PWD)
 
@@ -8,6 +5,11 @@ WORKDIR = $(PWD)
 GOCMD = go
 GOTEST = $(GOCMD) test -v
 
+# Git config
+GIT_VERSION ?=
+GIT_DIST_PATH ?= $(PWD)/.git-dist
+GIT_REPOSITORY = http://github.com/git/git.git
+
 # Coverage
 COVERAGE_REPORT = coverage.txt
 COVERAGE_PROFILE = profile.out
@@ -17,6 +19,16 @@ ifneq ($(origin CI), undefined)
 	WORKDIR := $(GOPATH)/src/gopkg.in/src-d/go-git.v4
 endif
 
+build-git:
+	@if [ -f $(GIT_DIST_PATH)/git ]; then \
+		echo "nothing to do, using cache $(GIT_DIST_PATH)"; \
+	else \
+		git clone $(GIT_REPOSITORY) -b $(GIT_VERSION) --depth 1 --single-branch $(GIT_DIST_PATH); \
+		cd $(GIT_DIST_PATH); \
+		make configure; \
+		./configure; \
+		make all; \
+	fi
 
 test:
 	cd $(WORKDIR); \
@@ -35,3 +47,6 @@ test-coverage:
 			rm $(COVERAGE_PROFILE); \
 		fi; \
 	done; \
+
+clean:
+	rm -rf $(GIT_DIST_PATH)
\ No newline at end of file
-- 
cgit