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git.go
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git.go
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package git
import (
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"regexp"
"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/go-git/go-git/v5/plumbing/transport/http"
ssh2 "github.com/go-git/go-git/v5/plumbing/transport/ssh"
log "github.com/sirupsen/logrus"
"golang.org/x/crypto/ssh"
argoerrors "github.com/argoproj/argo-workflows/v3/errors"
wfv1 "github.com/argoproj/argo-workflows/v3/pkg/apis/workflow/v1alpha1"
"github.com/argoproj/argo-workflows/v3/workflow/artifacts/common"
)
// ArtifactDriver is the artifact driver for a git repo
type ArtifactDriver struct {
Username string
Password string
SSHPrivateKey string
InsecureIgnoreHostKey bool
DisableSubmodules bool
}
var _ common.ArtifactDriver = &ArtifactDriver{}
var sshURLRegex = regexp.MustCompile("^(ssh://)?([^/:]*?)@[^@]+$")
func GetUser(url string) string {
matches := sshURLRegex.FindStringSubmatch(url)
if len(matches) > 2 {
return matches[2]
}
// default to `git` user unless username is specified in SSH url
return "git"
}
func (g *ArtifactDriver) auth(sshUser string) (func(), transport.AuthMethod, error) {
if g.SSHPrivateKey != "" {
signer, err := ssh.ParsePrivateKey([]byte(g.SSHPrivateKey))
if err != nil {
return nil, nil, err
}
privateKeyFile, err := ioutil.TempFile("", "id_rsa.")
if err != nil {
return nil, nil, err
}
err = ioutil.WriteFile(privateKeyFile.Name(), []byte(g.SSHPrivateKey), 0o600)
if err != nil {
return nil, nil, err
}
auth := &ssh2.PublicKeys{User: sshUser, Signer: signer}
if g.InsecureIgnoreHostKey {
auth.HostKeyCallback = ssh.InsecureIgnoreHostKey()
}
if g.InsecureIgnoreHostKey {
auth.HostKeyCallback = ssh.InsecureIgnoreHostKey()
}
return func() { _ = os.Remove(privateKeyFile.Name()) }, auth, nil
}
if g.Username != "" || g.Password != "" {
return func() {}, &http.BasicAuth{Username: g.Username, Password: g.Password}, nil
}
return func() {}, nil, nil
}
// Save is unsupported for git output artifacts
func (g *ArtifactDriver) Save(string, *wfv1.Artifact) error {
return errors.New("git output artifacts unsupported")
}
// Delete is unsupported for git artifacts
func (g *ArtifactDriver) Delete(s *wfv1.Artifact) error {
return common.ErrDeleteNotSupported
}
func (g *ArtifactDriver) Load(inputArtifact *wfv1.Artifact, path string) error {
a := inputArtifact.Git
sshUser := GetUser(a.Repo)
closer, auth, err := g.auth(sshUser)
if err != nil {
return err
}
defer closer()
depth := a.GetDepth()
cloneOptions := &git.CloneOptions{
URL: a.Repo,
Auth: auth,
Depth: depth,
SingleBranch: a.SingleBranch,
}
if a.SingleBranch && a.Branch == "" {
return errors.New("single branch mode without a branch specified")
}
if a.SingleBranch {
cloneOptions.ReferenceName = plumbing.NewBranchReferenceName(a.Branch)
}
r, err := git.PlainClone(path, false, cloneOptions)
switch err {
case transport.ErrEmptyRemoteRepository:
log.Info("Cloned an empty repository")
r, err := git.PlainInit(path, false)
if err != nil {
return fmt.Errorf("failed to plain init: %w", err)
}
if _, err := r.CreateRemote(&config.RemoteConfig{Name: git.DefaultRemoteName, URLs: []string{a.Repo}}); err != nil {
return fmt.Errorf("failed to create remote %q: %w", a.Repo, err)
}
branchName := a.Revision
if branchName == "" {
branchName = "master"
}
if err = r.CreateBranch(&config.Branch{Name: branchName, Remote: git.DefaultRemoteName, Merge: plumbing.Master}); err != nil {
return fmt.Errorf("failed to create branch %q: %w", branchName, err)
}
return nil
case nil:
// fallthrough ...
default:
return fmt.Errorf("failed to clone %q: %w", a.Repo, err)
}
if len(a.Fetch) > 0 {
refSpecs := make([]config.RefSpec, len(a.Fetch))
for i, spec := range a.Fetch {
refSpecs[i] = config.RefSpec(spec)
}
opts := &git.FetchOptions{Auth: auth, RefSpecs: refSpecs, Depth: depth}
if err := opts.Validate(); err != nil {
return fmt.Errorf("failed to validate fetch %v: %w", refSpecs, err)
}
if err = r.Fetch(opts); isFetchErr(err) {
return fmt.Errorf("failed to fetch %v: %w", refSpecs, err)
}
}
w, err := r.Worktree()
if err != nil {
return fmt.Errorf("failed to get work tree: %w", err)
}
if a.Revision != "" {
refSpecs := []config.RefSpec{"refs/heads/*:refs/heads/*"}
if a.SingleBranch {
refSpecs = []config.RefSpec{config.RefSpec(fmt.Sprintf("refs/heads/%s:refs/heads/%s", a.Branch, a.Branch))}
}
opts := &git.FetchOptions{Auth: auth, RefSpecs: refSpecs}
if err := opts.Validate(); err != nil {
return fmt.Errorf("failed to validate fetch %v: %w", refSpecs, err)
}
if err := r.Fetch(opts); isFetchErr(err) {
return fmt.Errorf("failed to fetch %v: %w", refSpecs, err)
}
h, err := r.ResolveRevision(plumbing.Revision(a.Revision))
if err != nil {
return fmt.Errorf("failed to get resolve revision: %w", err)
}
if err := w.Checkout(&git.CheckoutOptions{Hash: plumbing.NewHash(h.String())}); err != nil {
return fmt.Errorf("failed to checkout %q: %w", h, err)
}
}
if !a.DisableSubmodules {
s, err := w.Submodules()
if err != nil {
return fmt.Errorf("failed to get submodules: %w", err)
}
if err := s.Update(&git.SubmoduleUpdateOptions{
Init: true,
RecurseSubmodules: git.DefaultSubmoduleRecursionDepth,
Auth: auth,
}); err != nil {
return fmt.Errorf("failed to update submodules: %w", err)
}
}
return nil
}
func isFetchErr(err error) bool {
return err != nil && err.Error() != "already up-to-date"
}
func (g *ArtifactDriver) OpenStream(a *wfv1.Artifact) (io.ReadCloser, error) {
// todo: this is a temporary implementation which loads file to disk first
return common.LoadToStream(a, g)
}
func (g *ArtifactDriver) ListObjects(artifact *wfv1.Artifact) ([]string, error) {
return nil, fmt.Errorf("ListObjects is currently not supported for this artifact type, but it will be in a future version")
}
func (g *ArtifactDriver) IsDirectory(artifact *wfv1.Artifact) (bool, error) {
return false, argoerrors.New(argoerrors.CodeNotImplemented, "IsDirectory currently unimplemented for Git")
}