Serve .patch for pull requests (go-gitea#3305)

* Serve .patch for pull requests

Closes go-gitea#3259
Updates "git" module, for GetFormatPatch

* Handle io.Copy error

integrations/pull_create_test.go

@@ -56,7 +56,15 @@ func TestPullCreate(t *testing.T) {
 	// check .diff can be accessed and matches performed change
 	req := NewRequest(t, "GET", url+".diff")
 	resp = session.MakeRequest(t, req, http.StatusOK)
-	assert.Regexp(t, "\\+Hello, World \\(Edited\\)", resp.Body)
+	assert.Regexp(t, `\+Hello, World \(Edited\)`, resp.Body)
 	assert.Regexp(t, "^diff", resp.Body)
 	assert.NotRegexp(t, "diff.*diff", resp.Body) // not two diffs, just one
+
+	// check .patch can be accessed and matches performed change
+	req = NewRequest(t, "GET", url+".patch")
+	resp = session.MakeRequest(t, req, http.StatusOK)
+	assert.Regexp(t, `\+Hello, World \(Edited\)`, resp.Body)
+	assert.Regexp(t, "diff", resp.Body)
+	assert.Regexp(t, `Subject: \[PATCH\] Update 'README.md'`, resp.Body)
+	assert.NotRegexp(t, "diff.*diff", resp.Body) // not two diffs, just one
 }

routers/repo/pull.go

@@ -9,6 +9,7 @@ package repo
 import (
 	"container/list"
 	"fmt"
+	"io"
 	"path"
 	"strings"
 
@@ -1033,7 +1034,7 @@ func DownloadPullDiff(ctx *context.Context) {
 		return
 	}
 
-	// Redirect elsewhere if it's not a pull request
+	// Return not found if it's not a pull request
 	if !issue.IsPull {
 		ctx.Handle(404, "DownloadPullDiff",
 			fmt.Errorf("Issue is not a pull request"))
@@ -1054,3 +1055,48 @@ func DownloadPullDiff(ctx *context.Context) {
 
 	ctx.ServeFileContent(patch)
 }
+
+// DownloadPullPatch render a pull's raw patch
+func DownloadPullPatch(ctx *context.Context) {
+	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
+	if err != nil {
+		if models.IsErrIssueNotExist(err) {
+			ctx.Handle(404, "GetIssueByIndex", err)
+		} else {
+			ctx.Handle(500, "GetIssueByIndex", err)
+		}
+		return
+	}
+
+	// Return not found if it's not a pull request
+	if !issue.IsPull {
+		ctx.Handle(404, "DownloadPullDiff",
+			fmt.Errorf("Issue is not a pull request"))
+		return
+	}
+
+	pr := issue.PullRequest
+
+	if err = pr.GetHeadRepo(); err != nil {
+		ctx.Handle(500, "GetHeadRepo", err)
+		return
+	}
+
+	headGitRepo, err := git.OpenRepository(pr.HeadRepo.RepoPath())
+	if err != nil {
+		ctx.Handle(500, "OpenRepository", err)
+		return
+	}
+
+	patch, err := headGitRepo.GetFormatPatch(pr.MergeBase, pr.HeadBranch)
+	if err != nil {
+		ctx.Handle(500, "GetFormatPatch", err)
+		return
+	}
+
+	_, err = io.Copy(ctx, patch)
+	if err != nil {
+		ctx.Handle(500, "io.Copy", err)
+		return
+	}
+}

routers/routes/routes.go

@@ -625,6 +625,7 @@ func RegisterRoutes(m *macaron.Macaron) {
 
 		m.Group("/pulls/:index", func() {
 			m.Get(".diff", repo.DownloadPullDiff)
+			m.Get(".patch", repo.DownloadPullPatch)
 			m.Get("/commits", context.RepoRef(), repo.ViewPullCommits)
 			m.Get("/files", context.RepoRef(), repo.SetEditorconfigIfExists, repo.SetDiffViewStyle, repo.ViewPullFiles)
 			m.Post("/merge", reqRepoWriter, bindIgnErr(auth.MergePullRequestForm{}), repo.MergePullRequest)

vendor/vendor.json

@@ -3,10 +3,10 @@
 	"ignore": "test appengine",
 	"package": [
 		{
-			"checksumSHA1": "Em29XiKkOh5rFFXdkCjqqsQ7fe4=",
+			"checksumSHA1": "1WHdGmDRsFRTD5N69l+MEbZr+nM=",
 			"path": "code.gitea.io/git",
-			"revision": "4ec3654064ef7eef4f05f891073a38039ad8d0f7",
-			"revisionTime": "2017-12-22T02:43:26Z"
+			"revision": "f4a91053671bee69f1995e456c1541668717c19d",
+			"revisionTime": "2018-01-07T06:11:05Z"
 		},
 		{
 			"checksumSHA1": "Qtq0kW+BnpYMOriaoCjMa86WGG8=",