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clone.go
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clone.go
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package gitops
import (
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/config"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/transport"
"github.com/pkg/errors"
)
func CloneAndCheckout(workDir string, cloneOptions *git.CloneOptions, branchName string) (*git.Repository, *git.Worktree, error) {
if cloneOptions.RemoteName == "" {
cloneOptions.RemoteName = git.DefaultRemoteName
}
r, worktree, err := cloneAndCheckoutExisting(workDir, cloneOptions, branchName)
if err != nil {
if errors.Cause(err) == transport.ErrEmptyRemoteRepository {
r, worktree, err = cloneAndCheckoutNew(workDir, cloneOptions, branchName)
if err != nil {
return nil, nil, errors.Wrap(err, "failed to init new repo")
}
return r, worktree, nil
}
return nil, nil, errors.Wrap(err, "failed to clone existing repo")
}
return r, worktree, nil
}
func cloneAndCheckoutExisting(workDir string, cloneOptions *git.CloneOptions, branchName string) (*git.Repository, *git.Worktree, error) {
r, err := git.PlainClone(workDir, false, cloneOptions)
if err != nil {
return nil, nil, errors.Wrapf(err, "failed to clone repo %s", cloneOptions.URL)
}
workTree, err := r.Worktree()
if err != nil {
return nil, nil, errors.Wrap(err, "failed to get working tree")
}
branchRefName := plumbing.NewBranchReferenceName(branchName)
remoteBranchRefName := plumbing.NewRemoteReferenceName(cloneOptions.RemoteName, branchName)
remoteRef, err := r.Reference(remoteBranchRefName, false)
if err == plumbing.ErrReferenceNotFound {
remoteRef, err = r.Head()
if err != nil {
return nil, nil, errors.Wrapf(err, "failed to get HEAD ref")
}
} else if err != nil {
return nil, nil, errors.Wrapf(err, "failed to get ref %s", remoteBranchRefName)
}
// check out the branch
branchRef := plumbing.NewHashReference(branchRefName, remoteRef.Hash())
err = r.Storer.SetReference(branchRef)
if err != nil {
return nil, nil, errors.Wrapf(err, "failed to set ref %s", branchRefName)
}
err = workTree.Checkout(&git.CheckoutOptions{
Create: false,
Force: false,
Branch: branchRefName,
})
if err != nil {
return nil, nil, errors.Wrapf(err, "failed to checkout %s", branchRefName)
}
return r, workTree, nil
}
func cloneAndCheckoutNew(workDir string, cloneOptions *git.CloneOptions, branchName string) (*git.Repository, *git.Worktree, error) {
r, err := git.PlainInit(workDir, false)
if err != nil {
return nil, nil, errors.Wrapf(err, "failed to initialize repo %s", cloneOptions.URL)
}
_, err = r.CreateRemote(&config.RemoteConfig{
Name: cloneOptions.RemoteName,
URLs: []string{cloneOptions.URL},
})
if err != nil {
return nil, nil, errors.Wrapf(err, "failed to create remote %s", cloneOptions.URL)
}
workTree, err := r.Worktree()
if err != nil {
return nil, nil, errors.Wrap(err, "failed to get working tree")
}
branchRefName := plumbing.NewBranchReferenceName(branchName)
// check out the branch
branchRef := plumbing.NewSymbolicReference(plumbing.HEAD, branchRefName)
err = r.Storer.SetReference(branchRef)
if err != nil {
return nil, nil, errors.Wrapf(err, "failed to set ref %s", branchRefName)
}
return r, workTree, nil
}