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git.go
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git.go
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package git
import (
"errors"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
"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"
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, []string, error) {
if g.SSHPrivateKey != "" {
signer, err := ssh.ParsePrivateKey([]byte(g.SSHPrivateKey))
if err != nil {
return nil, nil, nil, err
}
privateKeyFile, err := ioutil.TempFile("", "id_rsa.")
if err != nil {
return nil, nil, nil, err
}
err = ioutil.WriteFile(privateKeyFile.Name(), []byte(g.SSHPrivateKey), 0o600)
if err != nil {
return nil, nil, nil, err
}
auth := &ssh2.PublicKeys{User: sshUser, Signer: signer}
if g.InsecureIgnoreHostKey {
auth.HostKeyCallback = ssh.InsecureIgnoreHostKey()
}
args := []string{"ssh", "-i", privateKeyFile.Name()}
if g.InsecureIgnoreHostKey {
args = append(args, "-o", "StrictHostKeyChecking=no", "-o", "UserKnownHostsFile=/dev/null")
} else {
args = append(args, "-o", "StrictHostKeyChecking=yes", "-o")
}
env := []string{"GIT_SSH_COMMAND=" + strings.Join(args, " ")}
if g.InsecureIgnoreHostKey {
auth.HostKeyCallback = ssh.InsecureIgnoreHostKey()
env = append(env, "GIT_SSL_NO_VERIFY=true")
}
return func() { _ = os.Remove(privateKeyFile.Name()) },
auth,
env,
nil
}
if g.Username != "" || g.Password != "" {
filename := filepath.Join(os.TempDir(), "git-ask-pass.sh")
_, err := os.Stat(filename)
if os.IsNotExist(err) {
//nolint:gosec
err := ioutil.WriteFile(filename, []byte(`#!/bin/sh
case "$1" in
Username*) echo "${GIT_USERNAME}" ;;
Password*) echo "${GIT_PASSWORD}" ;;
esac
`), 0o755)
if err != nil {
return nil, nil, nil, err
}
}
return func() {},
&http.BasicAuth{Username: g.Username, Password: g.Password},
[]string{
"GIT_ASKPASS=" + filename,
"GIT_USERNAME=" + g.Username,
"GIT_PASSWORD=" + g.Password,
},
nil
}
return func() {}, nil, nil, nil
}
// Save is unsupported for git output artifacts
func (g *ArtifactDriver) Save(string, *wfv1.Artifact) error {
return errors.New("git output artifacts unsupported")
}
func (g *ArtifactDriver) Load(inputArtifact *wfv1.Artifact, path string) error {
sshUser := GetUser(inputArtifact.Git.Repo)
closer, auth, env, err := g.auth(sshUser)
if err != nil {
return err
}
defer closer()
var recurseSubmodules = git.DefaultSubmoduleRecursionDepth
if inputArtifact.Git.DisableSubmodules {
log.Info("Recursive cloning of submodules is disabled")
recurseSubmodules = git.NoRecurseSubmodules
}
repo, err := git.PlainClone(path, false, &git.CloneOptions{
URL: inputArtifact.Git.Repo,
RecurseSubmodules: recurseSubmodules,
Auth: auth,
Depth: inputArtifact.Git.GetDepth(),
})
switch err {
case transport.ErrEmptyRemoteRepository:
log.Info("Cloned an empty repository ")
r, err := git.PlainInit(path, false)
if err != nil {
return err
}
if _, err := r.CreateRemote(&config.RemoteConfig{Name: git.DefaultRemoteName, URLs: []string{inputArtifact.Git.Repo}}); err != nil {
return err
}
branchName := inputArtifact.Git.Revision
if branchName == "" {
branchName = "master"
}
if err = r.CreateBranch(&config.Branch{Name: branchName, Remote: git.DefaultRemoteName, Merge: plumbing.Master}); err != nil {
return err
}
return nil
default:
return err
case nil:
// fallthrough ...
}
if inputArtifact.Git.Fetch != nil {
refSpecs := make([]config.RefSpec, len(inputArtifact.Git.Fetch))
for i, spec := range inputArtifact.Git.Fetch {
refSpecs[i] = config.RefSpec(spec)
}
fetchOptions := git.FetchOptions{
Auth: auth,
RefSpecs: refSpecs,
Depth: inputArtifact.Git.GetDepth(),
}
err = fetchOptions.Validate()
if err != nil {
return err
}
err = repo.Fetch(&fetchOptions)
if isAlreadyUpToDateErr(err) {
return err
}
}
if inputArtifact.Git.Revision != "" {
// We still rely on forking git for checkout, since go-git does not have a reliable
// way of resolving revisions (e.g. mybranch, HEAD^, v1.2.3)
rev := getRevisionForCheckout(inputArtifact.Git.Revision)
log.Info("Checking out revision ", rev)
cmd := exec.Command("git", "checkout", rev, "--")
cmd.Dir = path
cmd.Env = env
output, err := cmd.Output()
if err != nil {
return g.error(err, cmd)
}
log.Infof("`%s` stdout:\n%s", cmd.Args, string(output))
if !inputArtifact.Git.DisableSubmodules {
submodulesCmd := exec.Command("git", "submodule", "update", "--init", "--recursive", "--force")
submodulesCmd.Dir = path
submodulesCmd.Env = env
submoduleOutput, err := submodulesCmd.Output()
if err != nil {
return g.error(err, cmd)
}
log.Infof("`%s` stdout:\n%s", cmd.Args, string(submoduleOutput))
}
}
return nil
}
// getRevisionForCheckout trims "refs/heads/" from the revision name (if present)
// so that `git checkout` will succeed.
func getRevisionForCheckout(revision string) string {
return strings.TrimPrefix(revision, "refs/heads/")
}
func isAlreadyUpToDateErr(err error) bool {
return err != nil && err.Error() != "already up-to-date"
}
func (g *ArtifactDriver) error(err error, cmd *exec.Cmd) error {
if exErr, ok := err.(*exec.ExitError); ok {
log.Errorf("`%s` stderr:\n%s", cmd.Args, string(exErr.Stderr))
return errors.New(strings.Split(string(exErr.Stderr), "\n")[0])
}
return err
}
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")
}