Migrated Repository will show modifications when possible (#17191)

* Read patches to get history

modules/git/repo_compare_test.go

@@ -8,6 +8,7 @@ import (
 	"bytes"
 	"io"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"code.gitea.io/gitea/modules/util"
@@ -18,11 +19,11 @@ import (
 func TestGetFormatPatch(t *testing.T) {
 	bareRepo1Path := filepath.Join(testReposDir, "repo1_bare")
 	clonedPath, err := cloneRepo(bareRepo1Path, testReposDir, "repo1_TestGetFormatPatch")
-	assert.NoError(t, err)
 	defer util.RemoveAll(clonedPath)
-	repo, err := OpenRepository(clonedPath)
 	assert.NoError(t, err)
+	repo, err := OpenRepository(clonedPath)
 	defer repo.Close()
+	assert.NoError(t, err)
 	rd := &bytes.Buffer{}
 	err = repo.GetPatch("8d92fc95^", "8d92fc95", rd)
 	assert.NoError(t, err)
@@ -32,3 +33,49 @@ func TestGetFormatPatch(t *testing.T) {
 	assert.Regexp(t, "^From 8d92fc95", patch)
 	assert.Contains(t, patch, "Subject: [PATCH] Add file2.txt")
 }
+
+func TestReadPatch(t *testing.T) {
+	// Ensure we can read the patch files
+	bareRepo1Path := filepath.Join(testReposDir, "repo1_bare")
+	repo, err := OpenRepository(bareRepo1Path)
+	defer repo.Close()
+	assert.NoError(t, err)
+	// This patch doesn't exist
+	noFile, err := repo.ReadPatchCommit(0)
+	assert.Error(t, err)
+	// This patch is an empty one (sometimes it's a 404)
+	noCommit, err := repo.ReadPatchCommit(1)
+	assert.Error(t, err)
+	// This patch is legit and should return a commit
+	oldCommit, err := repo.ReadPatchCommit(2)
+	assert.NoError(t, err)
+
+	assert.Empty(t, noFile)
+	assert.Empty(t, noCommit)
+	assert.Len(t, oldCommit, 40)
+	assert.True(t, oldCommit == "6e8e2a6f9efd71dbe6917816343ed8415ad696c3")
+}
+
+func TestReadWritePullHead(t *testing.T) {
+	// Ensure we can write SHA1 head corresponding to PR and open them
+	bareRepo1Path := filepath.Join(testReposDir, "repo1_bare")
+	repo, err := OpenRepository(bareRepo1Path)
+	assert.NoError(t, err)
+	defer repo.Close()
+	// Try to open non-existing Pull
+	_, err = repo.ReadPullHead(0)
+	assert.Error(t, err)
+	// Write a fake sha1 with only 40 zeros
+	newCommit := strings.Repeat("0", 40)
+	err = repo.WritePullHead(1, newCommit)
+	assert.NoError(t, err)
+	headFile := filepath.Join(repo.Path, "refs/pull/1/head")
+	// Remove file after the test
+	defer util.Remove(headFile)
+	assert.FileExists(t, headFile)
+	// Read the file created
+	headContents, err := repo.ReadPullHead(1)
+	assert.NoError(t, err)
+	assert.Len(t, string(headContents), 40)
+	assert.True(t, string(headContents) == newCommit)
+}