go-git/worktree.go at main · Tylerx3udv/go-git · GitHub

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package git

import (
	"context"
	"errors"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"time"

	"github.com/go-git/go-billy/v5"
	"github.com/go-git/go-billy/v5/util"
	"github.com/go-git/go-git/v5/config"
	"github.com/go-git/go-git/v5/plumbing"
	"github.com/go-git/go-git/v5/plumbing/filemode"
	"github.com/go-git/go-git/v5/plumbing/format/index"
	"github.com/go-git/go-git/v5/plumbing/object"
	"github.com/go-git/go-git/v5/plumbing/storer"
	"github.com/go-git/go-git/v5/utils/ioutil"
	"github.com/go-git/go-git/v5/utils/merkletrie"
	"github.com/go-git/go-git/v5/utils/merkletrie/noder"
)

// Checkout switch branches or restore working tree files.
func (w *Worktree) Checkout(opts *CheckoutOptions) error {
	if err := opts.Validate(); err != nil {
		return err
	}

	if opts.Create {
		if err := w.createBranch(opts); err != nil {
			return err
		}
	}

	c, err := w.getCommitFromCheckoutOptions(opts)
	if err != nil {
		return err
	}

	oldHead, err := w.r.Head()
	if err != nil && err != plumbing.ErrReferenceNotFound {
		return err
	}

	var headHasChanged bool
	if !opts.Keep {
		headHasChanged, err = w.setHEAD(opts, c)
		if err != nil {
			return err
		}
	}

	if headHasChanged || opts.Force {
		err = w.checkout(c, opts.Force)
		if err != nil {
			if !opts.Keep && headHasChanged {
				if oldHead != nil {
					_ = w.r.Storer.SetReference(oldHead)
				} else {
					_ = w.r.Storer.RemoveReference(plumbing.HEAD)
				}
			}
			return err
		}
	}

	return nil
}