Accept git 1.7.2 as the minimum version (go-gitea#90)

* Add an head ref for the sake of using self repo for testing

* Add test for CommitCount

* Add testing with git-1.7.2

* Add test for GetLatestCommitTime

The test checks that latest commit time is before now
and more recent than the commit this PR is based at
Test no error is raised by time parsing and GetLatestCommitTime
Print actual time when tests fail

* Accept git 1.7.2 as the minimum version

Debian old old (very old) distribution (6.0 aka Squeeze)
ships version 1.7.10.4.

The version requirement was raised in go-gitea#46 supposedly for the
need of "symbolic-ref" command, but that command is supported
by the 1.7.2 version too, and possibly even older versions.

* Reduce output from drone, add comments

Reduce steps, concatenating them in logical steps

* Interrupt step upon first failure

* Add Dockerfile for use with ci

* Use ad-hoc docker image for testing git-1.7.2

* Avoid running build/vet/clean twice

* Set HEAD ref also in testing-1-7 step

.drone.yml

@@ -10,15 +10,26 @@ clone:
     tags: true
 
 pipeline:
-  testing:
+  test-general:
     image: webhippie/golang:edge
     pull: true
     commands:
       - make clean
       - make vet
       - make lint
-      - make test
       - make build
+  testing-git-latest:
+    image: webhippie/golang:edge
+    pull: true
+    commands:
+      - git update-ref refs/heads/test HEAD
+      - git --version && make test
+  testing-git-1.7:
+    image: docker.kbt.io/gitea-git-ci:1.7
+    pull: true
+    commands:
+      - git update-ref refs/heads/test HEAD
+      - PATH=/opt/git-1.7.2/bin git --version && make test
 
   # coverage:
   #   image: plugins/coverage:1

commit_test.go

@@ -0,0 +1,15 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package git
+
+import (
+	"testing"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCommitsCount(t *testing.T) {
+	commitsCount, _ := CommitsCount(".", "d86a90f801dbe279db095437a8c7ea42c60e8d98")
+	assert.Equal(t, int64(3), commitsCount)
+}

docker/ci/Dockerfile-git-1.7

@@ -0,0 +1,11 @@
+FROM webhippie/golang:edge
+RUN apk add --update autoconf zlib-dev > /dev/null && \
+    mkdir build && \
+    curl -sL "https://github.com/git/git/archive/v1.7.2.tar.gz" -o git.tar.gz && \
+    tar -C build -xzf git.tar.gz && \
+    cd build/git-1.7.2 && \
+    { autoconf 2> err || { cat err && false; } } && \
+    ./configure --without-tcltk --prefix=/opt/git-1.7.2 > /dev/null && \
+    { make install NO_PERL=please > /dev/null 2> err || { cat err && false; } } && \
+    cd ../.. && \
+    rm -rf build git.tar.gz \

docker/ci/Makefile

@@ -0,0 +1,2 @@
+git-1.7:
+	docker build -t gitea/ci:git-1.7 -f Dockerfile-git-1.7 .

git.go

@@ -25,7 +25,7 @@ var (
 	// Prefix the log prefix
 	Prefix = "[git-module] "
 	// GitVersionRequired is the minimum Git version required
-	GitVersionRequired = "1.8.1.6"
+	GitVersionRequired = "1.7.2"
 )
 
 func log(format string, args ...interface{}) {

repo_test.go

@@ -0,0 +1,25 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package git
+
+import (
+	"testing"
+	"time"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetLatestCommitTime(t *testing.T) {
+	lct, err := GetLatestCommitTime(".")
+	assert.NoError(t, err)
+	// Time is in the past
+	now := time.Now()
+	assert.True(t, lct.Unix() < now.Unix(), "%d not smaller than %d", lct, now)
+	// Time is after Mon Oct 23 03:52:09 2017 +0300
+	// which is the time of commit
+	// d47b98c44c9a6472e44ab80efe65235e11c6da2a
+	refTime, err := time.Parse("Mon Jan 02 15:04:05 2006 -0700", "Mon Oct 23 03:52:09 2017 +0300")
+	assert.NoError(t, err)
+	assert.True(t, lct.Unix() > refTime.Unix(), "%d not greater than %d", lct, refTime)
+}