switch to fork of go-git

vendor/github.com/jesseduffield/go-git/v5/Makefile

@@ -0,0 +1,38 @@
+# General
+WORKDIR = $(PWD)
+
+# Go parameters
+GOCMD = go
+GOTEST = $(GOCMD) test 
+
+# Git config
+GIT_VERSION ?=
+GIT_DIST_PATH ?= $(PWD)/.git-dist
+GIT_REPOSITORY = http://github.com/git/git.git
+
+# Coverage
+COVERAGE_REPORT = coverage.out
+COVERAGE_MODE = count
+
+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:
+	@echo "running against `git version`"; \
+	$(GOTEST) ./...
+
+test-coverage:
+	@echo "running against `git version`"; \
+	echo "" > $(COVERAGE_REPORT); \
+	$(GOTEST) -coverprofile=$(COVERAGE_REPORT) -coverpkg=./... -covermode=$(COVERAGE_MODE) ./...
+
+clean:
+	rm -rf $(GIT_DIST_PATH)