Initial port of gilt to golang

Basic overlay implementation.  Will accept a gilt.yml
like the following and extract to dest.

    ---
    - url: https://github.com/retr0h/ansible-etcd.git
      version: 77a95b7
      dst: roles/retr0h.ansible-etcd

This port differs from the python version.  The python
version can clone a branch or tag.  This version __only__
clones versions pointing to SHAs into a hashed directory
structure similar to `dep`.

* Unit tests.
* CLI integration tests with bats.
* Schema validation of config file.

To test things have exported variables and interfaces, which
feels kinda wrong.

.gitignore

@@ -1,7 +1,2 @@
-*.egg-info/
-*.py[cod]
-.cache/
-.coverage
-.eggs/
-.tox/
-doc/build/
+.build/
+coverage*

.travis.yml

@@ -0,0 +1,14 @@
+---
+sudo: falseo
+language: go
+go:
+ - 1.10.x
+git:
+ depth: 1
+install:
+ - go get golang.org/x/lint/golint
+ - go get github.com/mattn/goveralls
+script:
+ - make test
+ - make cover
+ - ${GOPATH}/bin/goveralls -coverprofile=coverage-all.out -service=travis-ci

CHANGELOG.md

@@ -0,0 +1,5 @@
+# History
+
+## 0.0.1
+
+* Ported to golang.

Gopkg.toml

@@ -0,0 +1,23 @@
+# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
+# for detailed Gopkg.toml documentation.
+
+[[constraint]]
+ name = "github.com/spf13/cobra"
+
+[[constraint]]
+ name = "gopkg.in/src-d/go-git"
+
+[[constraint]]
+ name = "github.com/xeipuuv/gojsonschema"
+
+[[constraint]]
+ name = "github.com/stretchr/testify"
+
+[[constraint]]
+ name = "github.com/ghodss/yaml"
+
+[[constraint]]
+ name = "github.com/kami-zh/go-capturer"
+
+[[constraint]]
+ name = "github.com/logrusorgru/aurora"

LICENSE

@@ -1,6 +1,6 @@
-The MIT License (MIT)
+The MIT License
 
-Copyright (c) 2016 Cisco Systems, Inc.
+Copyright (c) 2018 John Dewey
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -9,13 +9,13 @@ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

Makefile

@@ -0,0 +1,64 @@
+VENDOR := vendor
+PKGS := $(shell go list ./... | grep -v /$(VENDOR)/)
+$(if $(PKGS), , $(error "go list failed"))
+PKGS_DELIM := $(shell echo $(PKGS) | sed -e 's/ /,/g')
+GITCOMMIT ?= $(shell git rev-parse --short HEAD)
+$(if $(GITCOMMIT), , $(error "git rev-parse failed"))
+GITUNTRACKEDCHANGES := $(shell git status --porcelain --untracked-files=no)
+ifneq ($(GITUNTRACKEDCHANGES),)
+GITCOMMIT := $(GITCOMMIT)-dirty
+endif
+VERSION ?= $(shell git describe --tags --always)
+$(if $(VERSION), , $(error "git describe failed"))
+BUILDDATE := $(shell date '+%Y/%m/%d %H:%M:%S')
+LDFLAGS := -s \
+ -w \
+ -X 'main.version=$(VERSION)' \
+ -X 'main.buildHash=$(GITCOMMIT)' \
+ -X 'main.buildDate=$(BUILDDATE)'
+BUILDDIR := .build
+export GOCACHE = off
+
+test: fmt lint vet bats
+ @echo "+ $@"
+ @go test -parallel 5 -covermode=count ./...
+
+bats:
+ @echo "+ $@"
+ @./test/integration/vendor/bats/bin/bats test/integration
+
+cover:
+ @echo "+ $@"
+ $(shell [ -e coverage.out ] && rm coverage.out)
+ @echo "mode: count" > coverage-all.out
+ $(foreach pkg,$(PKGS),\
+ go test -coverprofile=coverage.out -covermode=count $(pkg);\
+ tail -n +2 coverage.out >> coverage-all.out;)
+ @go tool cover -html=coverage-all.out -o=coverage-all.html
+
+fmt:
+ @echo "+ $@"
+ @gofmt -s -l . | grep -v $(VENDOR) | tee /dev/stderr
+
+lint:
+ @echo "+ $@"
+ @golint ./... | grep -v $(VENDOR) | tee /dev/stderr
+
+vet:
+ @echo "+ $@"
+ @go vet $(shell go list ./... | grep -v $(VENDOR))
+
+clean:
+ @echo "+ $@"
+ @rm -rf $(BUILDDIR)
+
+build: clean
+ @echo "+ $@"
+ @docker run --rm -it \
+ -v $(CURDIR):/gopath/src/github.com/retr0h/go-gilt \
+ -w /gopath/src/github.com/retr0h/go-gilt \
+ tcnksm/gox:1.10.3 \
+ gox \
+ -ldflags="$(LDFLAGS)" \
+ -osarch="linux/amd64 darwin/amd64" \
+ -output="$(BUILDDIR)/{{.Dir}}_{{.OS}}_{{.Arch}}"