Gitea/modules/git/repo_tree.go

// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package git

import (
	"bytes"
	"context"
	"io"
	"os"
	"strings"
	"time"

	"gitea.dev/modules/git/gitcmd"
)

// CommitTreeOpts represents the possible options to CommitTree
type CommitTreeOpts struct {
	Parents    []string
	Message    string
	Key        *SigningKey
	NoGPGSign  bool
	AlwaysSign bool
}

// CommitTree creates a commit from a given tree id for the user with provided message
func (repo *Repository) CommitTree(ctx context.Context, author, committer *Signature, tree *Tree, opts CommitTreeOpts) (ObjectID, error) {
	commitTimeStr := time.Now().Format(time.RFC3339)

	// Because this may call hooks we should pass in the environment
	env := append(os.Environ(),
		"GIT_AUTHOR_NAME="+author.Name,
		"GIT_AUTHOR_EMAIL="+author.Email,
		"GIT_AUTHOR_DATE="+commitTimeStr,
		"GIT_COMMITTER_NAME="+committer.Name,
		"GIT_COMMITTER_EMAIL="+committer.Email,
		"GIT_COMMITTER_DATE="+commitTimeStr,
	)
	cmd := gitcmd.NewCommand("commit-tree").AddDynamicArguments(tree.ID.String())

	for _, parent := range opts.Parents {
		cmd.AddArguments("-p").AddDynamicArguments(parent)
	}

	messageBytes := new(bytes.Buffer)
	_, _ = messageBytes.WriteString(opts.Message)
	_, _ = messageBytes.WriteString("\n")

	if opts.Key != nil {
		if opts.Key.Format != "" {
			cmd.AddConfig("gpg.format", opts.Key.Format)
		}
		cmd.AddOptionFormat("-S%s", opts.Key.KeyID)
	} else if opts.AlwaysSign {
		cmd.AddOptionFormat("-S")
	}

	if opts.NoGPGSign {
		cmd.AddArguments("--no-gpg-sign")
	}

	stdout, _, err := cmd.WithEnv(env).
		WithRepo(repo).
		WithStdinBytes(messageBytes.Bytes()).
		RunStdString(ctx)
	if err != nil {
		return nil, err
	}
	return NewIDFromString(strings.TrimSpace(stdout))
}

func (repo *Repository) getTree(ctx context.Context, id ObjectID) (*Tree, error) {
	batch, cancel, err := repo.CatFileBatch()
	if err != nil {
		return nil, err
	}
	defer cancel()

	info, rd, err := batch.QueryContent(id.String())
	if err != nil {
		return nil, err
	}

	switch info.Type {
	case "tag":
		data, err := io.ReadAll(io.LimitReader(rd, info.Size))
		if err != nil {
			return nil, err
		}
		tag, err := parseTagData(id.Type(), data)
		if err != nil {
			return nil, err
		}

		commit, err := repo.getCommitWithBatch(batch, tag.Object)
		if err != nil {
			return nil, err
		}
		tree := commit.Tree()
		return tree, nil
	case "commit":
		commit, err := CommitFromReader(id, io.LimitReader(rd, info.Size))
		if err != nil {
			return nil, err
		}
		if _, err := rd.Discard(1); err != nil {
			return nil, err
		}
		tree := commit.Tree()
		return tree, nil
	case "tree":
		tree := newTree(id)
		objectFormat, err := repo.GetObjectFormat(ctx)
		if err != nil {
			return nil, err
		}
		tree.entries, err = catBatchParseTreeEntries(objectFormat, tree, rd, info.Size)
		if err != nil {
			return nil, err
		}
		tree.entriesParsed = true
		return tree, nil
	default:
		if err := DiscardFull(rd, info.Size+1); err != nil {
			return nil, err
		}
		return nil, ErrNotExist{
			ID: id.String(),
		}
	}
}

// GetTree find the tree object in the repository.
func (repo *Repository) GetTree(ctx context.Context, idStr string) (*Tree, error) {
	objectFormat, err := repo.GetObjectFormat(ctx)
	if err != nil {
		return nil, err
	}
	if len(idStr) != objectFormat.FullLength() {
		res, err := repo.GetRefCommitID(ctx, idStr)
		if err != nil {
			return nil, err
		}
		if len(res) > 0 {
			idStr = res
		}
	}
	id, err := NewIDFromString(idStr)
	if err != nil {
		return nil, err
	}

	return repo.getTree(ctx, id)
}