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// Copyright 2019 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 pull
import (
"context"
"fmt"
"os"
"path/filepath"
"strings"
"code.gitea.io/gitea/models"
issues_model "code.gitea.io/gitea/models/issues"
repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
repo_module "code.gitea.io/gitea/modules/repository"
)
// createTemporaryRepo creates a temporary repo with "base" for pr.BaseBranch and "tracking" for pr.HeadBranch
// it also create a second base branch called "original_base"
func createTemporaryRepo(ctx context.Context, pr *issues_model.PullRequest) (string, error) {
if err := pr.LoadHeadRepo(ctx); err != nil {
log.Error("LoadHeadRepo: %v", err)
return "", fmt.Errorf("LoadHeadRepo: %w", err)
} else if pr.HeadRepo == nil {
log.Error("Pr %d HeadRepo %d does not exist", pr.ID, pr.HeadRepoID)
return "", &repo_model.ErrRepoNotExist{
ID: pr.HeadRepoID,
}
} else if err := pr.LoadBaseRepo(ctx); err != nil {
log.Error("LoadBaseRepo: %v", err)
return "", fmt.Errorf("LoadBaseRepo: %w", err)
} else if pr.BaseRepo == nil {
log.Error("Pr %d BaseRepo %d does not exist", pr.ID, pr.BaseRepoID)
return "", &repo_model.ErrRepoNotExist{
ID: pr.BaseRepoID,
}
} else if err := pr.HeadRepo.GetOwner(ctx); err != nil {
log.Error("HeadRepo.GetOwner: %v", err)
return "", fmt.Errorf("HeadRepo.GetOwner: %w", err)
} else if err := pr.BaseRepo.GetOwner(ctx); err != nil {
log.Error("BaseRepo.GetOwner: %v", err)
return "", fmt.Errorf("BaseRepo.GetOwner: %w", err)
}
// Clone base repo.
tmpBasePath, err := repo_module.CreateTemporaryPath("pull")
if err != nil {
log.Error("CreateTemporaryPath: %v", err)
return "", err
}
baseRepoPath := pr.BaseRepo.RepoPath()
headRepoPath := pr.HeadRepo.RepoPath()
if err := git.InitRepository(ctx, tmpBasePath, false); err != nil {
log.Error("git init tmpBasePath: %v", err)
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", err
}
remoteRepoName := "head_repo"
baseBranch := "base"
// Add head repo remote.
addCacheRepo := func(staging, cache string) error {
p := filepath.Join(staging, ".git", "objects", "info", "alternates")
f, err := os.OpenFile(p, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o600)
if err != nil {
log.Error("Could not create .git/objects/info/alternates file in %s: %v", staging, err)
return err
}
defer f.Close()
data := filepath.Join(cache, "objects")
if _, err := fmt.Fprintln(f, data); err != nil {
log.Error("Could not write to .git/objects/info/alternates file in %s: %v", staging, err)
return err
}
return nil
}
if err := addCacheRepo(tmpBasePath, baseRepoPath); err != nil {
log.Error("Unable to add base repository to temporary repo [%s -> %s]: %v", pr.BaseRepo.FullName(), tmpBasePath, err)
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to add base repository to temporary repo [%s -> tmpBasePath]: %w", pr.BaseRepo.FullName(), err)
}
var outbuf, errbuf strings.Builder
if err := git.NewCommand(ctx, "remote", "add", "-t").AddDynamicArguments(pr.BaseBranch).AddArguments("-m").AddDynamicArguments(pr.BaseBranch).AddDynamicArguments("origin", baseRepoPath).
Run(&git.RunOpts{
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("Unable to add base repository as origin [%s -> %s]: %v\n%s\n%s", pr.BaseRepo.FullName(), tmpBasePath, err, outbuf.String(), errbuf.String())
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to add base repository as origin [%s -> tmpBasePath]: %w\n%s\n%s", pr.BaseRepo.FullName(), err, outbuf.String(), errbuf.String())
}
outbuf.Reset()
errbuf.Reset()
if err := git.NewCommand(ctx, "fetch", "origin", "--no-tags").AddDashesAndList(pr.BaseBranch+":"+baseBranch, pr.BaseBranch+":original_"+baseBranch).
Run(&git.RunOpts{
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("Unable to fetch origin base branch [%s:%s -> base, original_base in %s]: %v:\n%s\n%s", pr.BaseRepo.FullName(), pr.BaseBranch, tmpBasePath, err, outbuf.String(), errbuf.String())
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to fetch origin base branch [%s:%s -> base, original_base in tmpBasePath]: %w\n%s\n%s", pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
}
outbuf.Reset()
errbuf.Reset()
if err := git.NewCommand(ctx, "symbolic-ref").AddDynamicArguments("HEAD", git.BranchPrefix+baseBranch).
Run(&git.RunOpts{
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("Unable to set HEAD as base branch [%s]: %v\n%s\n%s", tmpBasePath, err, outbuf.String(), errbuf.String())
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to set HEAD as base branch [tmpBasePath]: %w\n%s\n%s", err, outbuf.String(), errbuf.String())
}
outbuf.Reset()
errbuf.Reset()
if err := addCacheRepo(tmpBasePath, headRepoPath); err != nil {
log.Error("Unable to add head repository to temporary repo [%s -> %s]: %v", pr.HeadRepo.FullName(), tmpBasePath, err)
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to head base repository to temporary repo [%s -> tmpBasePath]: %w", pr.HeadRepo.FullName(), err)
}
if err := git.NewCommand(ctx, "remote", "add").AddDynamicArguments(remoteRepoName, headRepoPath).
Run(&git.RunOpts{
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("Unable to add head repository as head_repo [%s -> %s]: %v\n%s\n%s", pr.HeadRepo.FullName(), tmpBasePath, err, outbuf.String(), errbuf.String())
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to add head repository as head_repo [%s -> tmpBasePath]: %w\n%s\n%s", pr.HeadRepo.FullName(), err, outbuf.String(), errbuf.String())
}
outbuf.Reset()
errbuf.Reset()
trackingBranch := "tracking"
// Fetch head branch
var headBranch string
if pr.Flow == issues_model.PullRequestFlowGithub {
headBranch = git.BranchPrefix + pr.HeadBranch
} else if len(pr.HeadCommitID) == 40 { // for not created pull request
headBranch = pr.HeadCommitID
} else {
headBranch = pr.GetGitRefName()
}
if err := git.NewCommand(ctx, "fetch", "--no-tags").AddDynamicArguments(remoteRepoName, headBranch+":"+trackingBranch).
Run(&git.RunOpts{
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
if !git.IsBranchExist(ctx, pr.HeadRepo.RepoPath(), pr.HeadBranch) {
return "", models.ErrBranchDoesNotExist{
BranchName: pr.HeadBranch,
}
}
log.Error("Unable to fetch head_repo head branch [%s:%s -> tracking in %s]: %v:\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, tmpBasePath, err, outbuf.String(), errbuf.String())
return "", fmt.Errorf("Unable to fetch head_repo head branch [%s:%s -> tracking in tmpBasePath]: %w\n%s\n%s", pr.HeadRepo.FullName(), headBranch, err, outbuf.String(), errbuf.String())
}
outbuf.Reset()
errbuf.Reset()
return tmpBasePath, nil
}
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