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plugin.go
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plugin.go
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package plugin
import (
"bytes"
"context"
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"github.com/argoproj/pkg/rand"
"github.com/argoproj/argo-cd/v2/common"
"github.com/argoproj/argo-cd/v2/util/buffered_context"
"github.com/argoproj/argo-cd/v2/util/cmp"
"github.com/argoproj/argo-cd/v2/util/io/files"
"github.com/argoproj/gitops-engine/pkg/utils/kube"
"github.com/mattn/go-zglob"
log "github.com/sirupsen/logrus"
"github.com/argoproj/argo-cd/v2/cmpserver/apiclient"
)
// cmpTimeoutBuffer is the amount of time before the request deadline to timeout server-side work. It makes sure there's
// enough time before the client times out to send a meaningful error message.
const cmpTimeoutBuffer = 100 * time.Millisecond
// Service implements ConfigManagementPluginService interface
type Service struct {
initConstants CMPServerInitConstants
}
type CMPServerInitConstants struct {
PluginConfig PluginConfig
}
// NewService returns a new instance of the ConfigManagementPluginService
func NewService(initConstants CMPServerInitConstants) *Service {
return &Service{
initConstants: initConstants,
}
}
func (s *Service) Init() error {
workDir := common.GetCMPWorkDir()
err := os.RemoveAll(workDir)
if err != nil {
return fmt.Errorf("error removing workdir %q: %s", workDir, err)
}
err = os.MkdirAll(workDir, 0700)
if err != nil {
return fmt.Errorf("error creating workdir %q: %s", workDir, err)
}
return nil
}
func runCommand(ctx context.Context, command Command, path string, env []string) (string, error) {
if len(command.Command) == 0 {
return "", fmt.Errorf("Command is empty")
}
cmd := exec.CommandContext(ctx, command.Command[0], append(command.Command[1:], command.Args...)...)
cmd.Env = env
cmd.Dir = path
execId, err := rand.RandString(5)
if err != nil {
return "", err
}
logCtx := log.WithFields(log.Fields{"execID": execId})
// log in a way we can copy-and-paste into a terminal
args := strings.Join(cmd.Args, " ")
logCtx.WithFields(log.Fields{"dir": cmd.Dir}).Info(args)
var stdout bytes.Buffer
var stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
// Make sure the command is killed immediately on timeout. https://stackoverflow.com/a/38133948/684776
cmd.SysProcAttr = newSysProcAttr(true)
start := time.Now()
err = cmd.Start()
if err != nil {
return "", err
}
go func() {
<-ctx.Done()
// Kill by group ID to make sure child processes are killed. The - tells `kill` that it's a group ID.
// Since we didn't set Pgid in SysProcAttr, the group ID is the same as the process ID. https://pkg.go.dev/syscall#SysProcAttr
_ = sysCallKill(-cmd.Process.Pid)
}()
err = cmd.Wait()
duration := time.Since(start)
output := stdout.String()
logCtx.WithFields(log.Fields{"duration": duration}).Debug(output)
if err != nil {
err := newCmdError(args, errors.New(err.Error()), strings.TrimSpace(stderr.String()))
logCtx.Error(err.Error())
return strings.TrimSuffix(output, "\n"), err
}
return strings.TrimSuffix(output, "\n"), nil
}
type CmdError struct {
Args string
Stderr string
Cause error
}
func (ce *CmdError) Error() string {
res := fmt.Sprintf("`%v` failed %v", ce.Args, ce.Cause)
if ce.Stderr != "" {
res = fmt.Sprintf("%s: %s", res, ce.Stderr)
}
return res
}
func newCmdError(args string, cause error, stderr string) *CmdError {
return &CmdError{Args: args, Stderr: stderr, Cause: cause}
}
// Environ returns a list of environment variables in name=value format from a list of variables
func environ(envVars []*apiclient.EnvEntry) []string {
var environ []string
for _, item := range envVars {
if item != nil && item.Name != "" && item.Value != "" {
environ = append(environ, fmt.Sprintf("%s=%s", item.Name, item.Value))
}
}
return environ
}
// GenerateManifest runs generate command from plugin config file and returns generated manifest files
func (s *Service) GenerateManifest(stream apiclient.ConfigManagementPluginService_GenerateManifestServer) error {
ctx, cancel := buffered_context.WithEarlierDeadline(stream.Context(), cmpTimeoutBuffer)
defer cancel()
workDir, err := files.CreateTempDir(common.GetCMPWorkDir())
if err != nil {
return fmt.Errorf("error creating temp dir: %s", err)
}
defer func() {
if err := os.RemoveAll(workDir); err != nil {
// we panic here as the workDir may contain sensitive information
panic(fmt.Sprintf("error removing generate manifest workdir: %s", err))
}
}()
metadata, err := cmp.ReceiveRepoStream(ctx, stream, workDir)
if err != nil {
return fmt.Errorf("generate manifest error receiving stream: %s", err)
}
appPath := filepath.Clean(filepath.Join(workDir, metadata.AppRelPath))
if !strings.HasPrefix(appPath, workDir) {
return fmt.Errorf("illegal appPath: out of workDir bound")
}
response, err := s.generateManifest(ctx, appPath, metadata.GetEnv())
if err != nil {
return fmt.Errorf("error generating manifests: %s", err)
}
err = stream.SendAndClose(response)
if err != nil {
return fmt.Errorf("error sending manifest response: %s", err)
}
return nil
}
// generateManifest runs generate command from plugin config file and returns generated manifest files
func (s *Service) generateManifest(ctx context.Context, appDir string, envEntries []*apiclient.EnvEntry) (*apiclient.ManifestResponse, error) {
if deadline, ok := ctx.Deadline(); ok {
log.Infof("Generating manifests with deadline %v from now", time.Until(deadline))
} else {
log.Info("Generating manifests with no request-level timeout")
}
config := s.initConstants.PluginConfig
env := append(os.Environ(), environ(envEntries)...)
if len(config.Spec.Init.Command) > 0 {
_, err := runCommand(ctx, config.Spec.Init, appDir, env)
if err != nil {
return &apiclient.ManifestResponse{}, err
}
}
out, err := runCommand(ctx, config.Spec.Generate, appDir, env)
if err != nil {
return &apiclient.ManifestResponse{}, err
}
manifests, err := kube.SplitYAMLToString([]byte(out))
if err != nil {
return &apiclient.ManifestResponse{}, err
}
return &apiclient.ManifestResponse{
Manifests: manifests,
}, err
}
// MatchRepository receives the application stream and checks whether
// its repository type is supported by the config management plugin
// server.
//The checks are implemented in the following order:
// 1. If spec.Discover.FileName is provided it finds for a name match in Applications files
// 2. If spec.Discover.Find.Glob is provided if finds for a glob match in Applications files
// 3. Otherwise it runs the spec.Discover.Find.Command
func (s *Service) MatchRepository(stream apiclient.ConfigManagementPluginService_MatchRepositoryServer) error {
bufferedCtx, cancel := buffered_context.WithEarlierDeadline(stream.Context(), cmpTimeoutBuffer)
defer cancel()
workDir, err := files.CreateTempDir(common.GetCMPWorkDir())
if err != nil {
return fmt.Errorf("error creating match repository workdir: %s", err)
}
defer func() {
if err := os.RemoveAll(workDir); err != nil {
// we panic here as the workDir may contain sensitive information
panic(fmt.Sprintf("error removing match repository workdir: %s", err))
}
}()
metadata, err := cmp.ReceiveRepoStream(bufferedCtx, stream, workDir)
if err != nil {
return fmt.Errorf("match repository error receiving stream: %s", err)
}
isSupported, err := s.matchRepository(bufferedCtx, workDir, metadata.GetEnv())
if err != nil {
return fmt.Errorf("match repository error: %s", err)
}
repoResponse := &apiclient.RepositoryResponse{IsSupported: isSupported}
err = stream.SendAndClose(repoResponse)
if err != nil {
return fmt.Errorf("error sending match repository response: %s", err)
}
return nil
}
func (s *Service) matchRepository(ctx context.Context, workdir string, envEntries []*apiclient.EnvEntry) (bool, error) {
config := s.initConstants.PluginConfig
if config.Spec.Discover.FileName != "" {
log.Debugf("config.Spec.Discover.FileName is provided")
pattern := filepath.Join(workdir, config.Spec.Discover.FileName)
matches, err := filepath.Glob(pattern)
if err != nil {
e := fmt.Errorf("error finding filename match for pattern %q: %s", pattern, err)
log.Debug(e)
return false, e
}
return len(matches) > 0, nil
}
if config.Spec.Discover.Find.Glob != "" {
log.Debugf("config.Spec.Discover.Find.Glob is provided")
pattern := filepath.Join(workdir, config.Spec.Discover.Find.Glob)
// filepath.Glob doesn't have '**' support hence selecting third-party lib
// https://github.com/golang/go/issues/11862
matches, err := zglob.Glob(pattern)
if err != nil {
e := fmt.Errorf("error finding glob match for pattern %q: %s", pattern, err)
log.Debug(e)
return false, e
}
if len(matches) > 0 {
return true, nil
}
return false, nil
}
log.Debugf("Going to try runCommand.")
env := append(os.Environ(), environ(envEntries)...)
find, err := runCommand(ctx, config.Spec.Discover.Find.Command, workdir, env)
if err != nil {
return false, fmt.Errorf("error running find command: %s", err)
}
if find != "" {
return true, nil
}
return false, nil
}