196 lines
8.1 KiB
Go
196 lines
8.1 KiB
Go
// Copyright 2019 The Gitea Authors.
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// All rights reserved.
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// SPDX-License-Identifier: MIT
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package pull
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import (
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"context"
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"fmt"
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"os"
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"path/filepath"
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"strings"
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git_model "code.gitea.io/gitea/models/git"
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issues_model "code.gitea.io/gitea/models/issues"
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repo_model "code.gitea.io/gitea/models/repo"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/log"
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repo_module "code.gitea.io/gitea/modules/repository"
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)
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// Temporary repos created here use standard branch names to help simplify
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// merging code
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const (
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baseBranch = "base" // equivalent to pr.BaseBranch
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trackingBranch = "tracking" // equivalent to pr.HeadBranch
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stagingBranch = "staging" // this is used for a working branch
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)
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type prContext struct {
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context.Context
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tmpBasePath string
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pr *issues_model.PullRequest
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outbuf *strings.Builder // we keep these around to help reduce needless buffer recreation,
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errbuf *strings.Builder // any use should be preceded by a Reset and preferably after use
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}
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func (ctx *prContext) RunOpts() *git.RunOpts {
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ctx.outbuf.Reset()
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ctx.errbuf.Reset()
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return &git.RunOpts{
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Dir: ctx.tmpBasePath,
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Stdout: ctx.outbuf,
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Stderr: ctx.errbuf,
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}
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}
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// createTemporaryRepoForPR creates a temporary repo with "base" for pr.BaseBranch and "tracking" for pr.HeadBranch
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// it also create a second base branch called "original_base"
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func createTemporaryRepoForPR(ctx context.Context, pr *issues_model.PullRequest) (prCtx *prContext, cancel context.CancelFunc, err error) {
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if err := pr.LoadHeadRepo(ctx); err != nil {
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log.Error("%-v LoadHeadRepo: %v", pr, err)
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return nil, nil, fmt.Errorf("%v LoadHeadRepo: %w", pr, err)
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} else if pr.HeadRepo == nil {
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log.Error("%-v HeadRepo %d does not exist", pr, pr.HeadRepoID)
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return nil, nil, &repo_model.ErrRepoNotExist{
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ID: pr.HeadRepoID,
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}
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} else if err := pr.LoadBaseRepo(ctx); err != nil {
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log.Error("%-v LoadBaseRepo: %v", pr, err)
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return nil, nil, fmt.Errorf("%v LoadBaseRepo: %w", pr, err)
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} else if pr.BaseRepo == nil {
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log.Error("%-v BaseRepo %d does not exist", pr, pr.BaseRepoID)
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return nil, nil, &repo_model.ErrRepoNotExist{
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ID: pr.BaseRepoID,
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}
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} else if err := pr.HeadRepo.LoadOwner(ctx); err != nil {
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log.Error("%-v HeadRepo.LoadOwner: %v", pr, err)
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return nil, nil, fmt.Errorf("%v HeadRepo.LoadOwner: %w", pr, err)
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} else if err := pr.BaseRepo.LoadOwner(ctx); err != nil {
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log.Error("%-v BaseRepo.LoadOwner: %v", pr, err)
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return nil, nil, fmt.Errorf("%v BaseRepo.LoadOwner: %w", pr, err)
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}
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// Clone base repo.
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tmpBasePath, err := repo_module.CreateTemporaryPath("pull")
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if err != nil {
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log.Error("CreateTemporaryPath[%-v]: %v", pr, err)
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return nil, nil, err
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}
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prCtx = &prContext{
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Context: ctx,
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tmpBasePath: tmpBasePath,
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pr: pr,
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outbuf: &strings.Builder{},
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errbuf: &strings.Builder{},
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}
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cancel = func() {
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if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
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log.Error("Error whilst removing removing temporary repo for %-v: %v", pr, err)
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}
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}
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baseRepoPath := pr.BaseRepo.RepoPath()
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headRepoPath := pr.HeadRepo.RepoPath()
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if err := git.InitRepository(ctx, tmpBasePath, false); err != nil {
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log.Error("Unable to init tmpBasePath for %-v: %v", pr, err)
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cancel()
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return nil, nil, err
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}
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remoteRepoName := "head_repo"
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baseBranch := "base"
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fetchArgs := git.TrustedCmdArgs{"--no-tags"}
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if git.CheckGitVersionAtLeast("2.25.0") == nil {
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// Writing the commit graph can be slow and is not needed here
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fetchArgs = append(fetchArgs, "--no-write-commit-graph")
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}
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// addCacheRepo adds git alternatives for the cacheRepoPath in the repoPath
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addCacheRepo := func(repoPath, cacheRepoPath string) error {
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p := filepath.Join(repoPath, ".git", "objects", "info", "alternates")
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f, err := os.OpenFile(p, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o600)
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if err != nil {
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log.Error("Could not create .git/objects/info/alternates file in %s: %v", repoPath, err)
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return err
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}
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defer f.Close()
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data := filepath.Join(cacheRepoPath, "objects")
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if _, err := fmt.Fprintln(f, data); err != nil {
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log.Error("Could not write to .git/objects/info/alternates file in %s: %v", repoPath, err)
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return err
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}
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return nil
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}
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// Add head repo remote.
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if err := addCacheRepo(tmpBasePath, baseRepoPath); err != nil {
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log.Error("%-v Unable to add base repository to temporary repo [%s -> %s]: %v", pr, pr.BaseRepo.FullName(), tmpBasePath, err)
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cancel()
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return nil, nil, fmt.Errorf("Unable to add base repository to temporary repo [%s -> tmpBasePath]: %w", pr.BaseRepo.FullName(), err)
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}
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if err := git.NewCommand(ctx, "remote", "add", "-t").AddDynamicArguments(pr.BaseBranch).AddArguments("-m").AddDynamicArguments(pr.BaseBranch).AddDynamicArguments("origin", baseRepoPath).
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Run(prCtx.RunOpts()); err != nil {
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log.Error("%-v Unable to add base repository as origin [%s -> %s]: %v\n%s\n%s", pr, pr.BaseRepo.FullName(), tmpBasePath, err, prCtx.outbuf.String(), prCtx.errbuf.String())
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cancel()
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return nil, nil, fmt.Errorf("Unable to add base repository as origin [%s -> tmpBasePath]: %w\n%s\n%s", pr.BaseRepo.FullName(), err, prCtx.outbuf.String(), prCtx.errbuf.String())
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}
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if err := git.NewCommand(ctx, "fetch", "origin").AddArguments(fetchArgs...).AddDashesAndList(pr.BaseBranch+":"+baseBranch, pr.BaseBranch+":original_"+baseBranch).
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Run(prCtx.RunOpts()); err != nil {
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log.Error("%-v Unable to fetch origin base branch [%s:%s -> base, original_base in %s]: %v:\n%s\n%s", pr, pr.BaseRepo.FullName(), pr.BaseBranch, tmpBasePath, err, prCtx.outbuf.String(), prCtx.errbuf.String())
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cancel()
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return nil, nil, 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, prCtx.outbuf.String(), prCtx.errbuf.String())
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}
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if err := git.NewCommand(ctx, "symbolic-ref").AddDynamicArguments("HEAD", git.BranchPrefix+baseBranch).
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Run(prCtx.RunOpts()); err != nil {
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log.Error("%-v Unable to set HEAD as base branch in [%s]: %v\n%s\n%s", pr, tmpBasePath, err, prCtx.outbuf.String(), prCtx.errbuf.String())
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cancel()
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return nil, nil, fmt.Errorf("Unable to set HEAD as base branch in tmpBasePath: %w\n%s\n%s", err, prCtx.outbuf.String(), prCtx.errbuf.String())
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}
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if err := addCacheRepo(tmpBasePath, headRepoPath); err != nil {
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log.Error("%-v Unable to add head repository to temporary repo [%s -> %s]: %v", pr, pr.HeadRepo.FullName(), tmpBasePath, err)
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cancel()
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return nil, nil, fmt.Errorf("Unable to add head base repository to temporary repo [%s -> tmpBasePath]: %w", pr.HeadRepo.FullName(), err)
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}
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if err := git.NewCommand(ctx, "remote", "add").AddDynamicArguments(remoteRepoName, headRepoPath).
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Run(prCtx.RunOpts()); err != nil {
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log.Error("%-v Unable to add head repository as head_repo [%s -> %s]: %v\n%s\n%s", pr, pr.HeadRepo.FullName(), tmpBasePath, err, prCtx.outbuf.String(), prCtx.errbuf.String())
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cancel()
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return nil, nil, fmt.Errorf("Unable to add head repository as head_repo [%s -> tmpBasePath]: %w\n%s\n%s", pr.HeadRepo.FullName(), err, prCtx.outbuf.String(), prCtx.errbuf.String())
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}
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trackingBranch := "tracking"
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// Fetch head branch
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var headBranch string
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if pr.Flow == issues_model.PullRequestFlowGithub {
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headBranch = git.BranchPrefix + pr.HeadBranch
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} else if len(pr.HeadCommitID) == git.SHAFullLength { // for not created pull request
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headBranch = pr.HeadCommitID
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} else {
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headBranch = pr.GetGitRefName()
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}
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if err := git.NewCommand(ctx, "fetch").AddArguments(fetchArgs...).AddDynamicArguments(remoteRepoName, headBranch+":"+trackingBranch).
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Run(prCtx.RunOpts()); err != nil {
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cancel()
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if !git.IsBranchExist(ctx, pr.HeadRepo.RepoPath(), pr.HeadBranch) {
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return nil, nil, git_model.ErrBranchNotExist{
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BranchName: pr.HeadBranch,
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}
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}
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log.Error("%-v Unable to fetch head_repo head branch [%s:%s -> tracking in %s]: %v:\n%s\n%s", pr, pr.HeadRepo.FullName(), pr.HeadBranch, tmpBasePath, err, prCtx.outbuf.String(), prCtx.errbuf.String())
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return nil, nil, fmt.Errorf("Unable to fetch head_repo head branch [%s:%s -> tracking in tmpBasePath]: %w\n%s\n%s", pr.HeadRepo.FullName(), headBranch, err, prCtx.outbuf.String(), prCtx.errbuf.String())
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}
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prCtx.outbuf.Reset()
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prCtx.errbuf.Reset()
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return prCtx, cancel, nil
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}
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