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forgejo/services/pull/temp_repo.go
zeripath 8598356df1
Refactor and tidy-up the merge/update branch code (#22568)
The merge and update branch code was previously a little tangled and had
some very long functions. The functions were not very clear in their
reasoning and there were deficiencies in their logging and at least one
bug in the handling of LFS for update by rebase.

This PR substantially refactors this code and splits things out to into
separate functions. It also attempts to tidy up the calls by wrapping
things in "context"s. There are also attempts to improve logging when
there are errors.

Signed-off-by: Andrew Thornton <art27@cantab.net>

---------

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: delvh <dev.lh@web.de>
2023-03-07 15:07:35 -05:00

195 lines
8.1 KiB
Go

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