package main import ( "fmt" "github.com/Sirupsen/logrus" "github.com/aws/aws-sdk-go/aws/credentials" "github.com/aws/aws-sdk-go/aws/credentials/stscreds" "github.com/aws/aws-sdk-go/aws/session" "github.com/aws/aws-sdk-go/service/sts" "io/ioutil" "os" "os/exec" "strings" "time" ) type ( Config struct { Remote Remote Plan bool Vars map[string]string Secrets map[string]string Cacert string Sensitive bool RoleARN string RootDir string Parallelism int Targets []string } Remote struct { Backend string `json:"backend"` Config map[string]string `json:"config"` } Plugin struct { Config Config } ) func (p Plugin) Exec() error { if p.Config.RoleARN != "" { assumeRole(p.Config.RoleARN) } var commands []*exec.Cmd if len(p.Config.Secrets) != 0 { exportSecrets(p.Config.Secrets) } remote := p.Config.Remote if p.Config.Cacert != "" { commands = append(commands, installCaCert(p.Config.Cacert)) } if remote.Backend != "" { commands = append(commands, deleteCache()) commands = append(commands, remoteConfigCommand(remote)) } commands = append(commands, getModules()) commands = append(commands, validateCommand()) commands = append(commands, planCommand(p.Config.Vars, p.Config.Secrets, p.Config.Parallelism, p.Config.Targets)) if !p.Config.Plan { commands = append(commands, applyCommand(p.Config.Parallelism, p.Config.Targets)) } commands = append(commands, deleteCache()) for _, c := range commands { if c.Dir == "" { wd, err := os.Getwd() if err == nil { c.Dir = wd } } if p.Config.RootDir != "" { c.Dir = c.Dir + "/" + p.Config.RootDir } c.Stdout = os.Stdout c.Stderr = os.Stderr if !p.Config.Sensitive { trace(c) } err := c.Run() if err != nil { logrus.WithFields(logrus.Fields{ "error": err, }).Fatal("Failed to execute a command") } logrus.Debug("Command completed successfully") } return nil } func installCaCert(cacert string) *exec.Cmd { ioutil.WriteFile("/usr/local/share/ca-certificates/ca_cert.crt", []byte(cacert), 0644) return exec.Command( "update-ca-certificates", ) } func exportSecrets(secrets map[string]string) { for k, v := range secrets { os.Setenv(fmt.Sprintf("%s", k), fmt.Sprintf("%s", os.Getenv(v))) } } func deleteCache() *exec.Cmd { return exec.Command( "rm", "-rf", ".terraform", ) } func remoteConfigCommand(config Remote) *exec.Cmd { args := []string{ "remote", "config", fmt.Sprintf("-backend=%s", config.Backend), } for k, v := range config.Config { args = append(args, fmt.Sprintf("-backend-config=%s=%s", k, v)) } return exec.Command( "terraform", args..., ) } func getModules() *exec.Cmd { return exec.Command( "terraform", "get", ) } func validateCommand() *exec.Cmd { args := []string{ "validate", } return exec.Command( "terraform", args..., ) } func planCommand(variables map[string]string, secrets map[string]string, parallelism int, targets []string) *exec.Cmd { args := []string{ "plan", "-out=plan.tfout", } for _, v := range targets { args = append(args, "--target", fmt.Sprintf("%s", v)) } for k, v := range variables { args = append(args, "-var") args = append(args, fmt.Sprintf("%s=%s", k, v)) } for k, v := range secrets { args = append(args, "-var") args = append(args, fmt.Sprintf("%s=%s", k, os.Getenv(v))) } if parallelism > 0 { args = append(args, fmt.Sprintf("-parallelism=%d", parallelism)) } return exec.Command( "terraform", args..., ) } func applyCommand(parallelism int, targets []string) *exec.Cmd { args := []string{ "apply", } for _, v := range targets { args = append(args, "--target", fmt.Sprintf("%s", v)) } if parallelism > 0 { args = append(args, fmt.Sprintf("-parallelism=%d", parallelism)) } args = append(args, "plan.tfout") return exec.Command( "terraform", args..., ) } func assumeRole(roleArn string) { client := sts.New(session.New()) duration := time.Hour * 1 stsProvider := &stscreds.AssumeRoleProvider{ Client: client, Duration: duration, RoleARN: roleArn, RoleSessionName: "drone", } value, err := credentials.NewCredentials(stsProvider).Get() if err != nil { logrus.WithFields(logrus.Fields{ "error": err, }).Fatal("Error assuming role!") } os.Setenv("AWS_ACCESS_KEY_ID", value.AccessKeyID) os.Setenv("AWS_SECRET_ACCESS_KEY", value.SecretAccessKey) os.Setenv("AWS_SESSION_TOKEN", value.SessionToken) } func trace(cmd *exec.Cmd) { fmt.Println("$", strings.Join(cmd.Args, " ")) }