// boot chain dependencies // TODO: this currently only supports simple services (with no further dependencies) func bootDependencies(chain *definitions.Chain, do *definitions.Do) error { if chain.Dependencies != nil { name := do.Name logger.Infoln("Booting chain dependencies", chain.Dependencies.Services, chain.Dependencies.Chains) for _, srvName := range chain.Dependencies.Services { do.Name = srvName srv, err := loaders.LoadServiceDefinition(do.Name, false, do.Operations.ContainerNumber) if err != nil { return err } if !services.IsServiceRunning(srv.Service, srv.Operations) { name := strings.ToUpper(do.Name) logger.Infof("%s is not running. Starting now. Waiting for %s to become available \n", name, name) if _, err = perform.DockerRun(srv.Service, srv.Operations); err != nil { return err } } } do.Name = name // undo side effects for _, chainName := range chain.Dependencies.Chains { chn, err := loaders.LoadChainDefinition(chainName, false, do.Operations.ContainerNumber) if err != nil { return err } if !IsChainRunning(chn) { return fmt.Errorf("chain %s depends on chain %s but %s is not running", chain.Name, chainName, chainName) } } } return nil }
func StartChain(do *definitions.Do) error { logger.Infoln("Ensuring Key Server is Started.") //should it take a flag? keys server may be running another cNum // XXX: currently we don't use or need a key server. // plus this should be specified in a service def anyways keysService, err := loaders.LoadServiceDefinition("keys", false, 1) if err != nil { return err } err = perform.DockerRun(keysService.Service, keysService.Operations) if err != nil { return err } chain, err := loaders.LoadChainDefinition(do.Name, false, do.Operations.ContainerNumber) if err != nil { logger.Infoln("Cannot start a chain I cannot find.") do.Result = "no file" return nil } if chain.Name == "" { logger.Infoln("Cannot start a chain without a name.") do.Result = "no name" return nil } chain.Service.Command = loaders.ErisChainStart if do.Run { chain.Service.Command = loaders.ErisChainStartApi } util.OverWriteOperations(chain.Operations, do.Operations) chain.Service.Environment = append(chain.Service.Environment, "CHAIN_ID="+chain.ChainID) logger.Infof("StartChainRaw to DockerRun =>\t%s\n", chain.Service.Name) logger.Debugf("\twith ChainID =>\t\t%v\n", chain.ChainID) logger.Debugf("\twith Environment =>\t%v\n", chain.Service.Environment) logger.Debugf("\twith AllPortsPublshd =>\t%v\n", chain.Operations.PublishAllPorts) if err := perform.DockerRun(chain.Service, chain.Operations); err != nil { do.Result = "error" return err } return nil }
// start a group of chains or services. catch errors on a channel so we can stop as soon as something goes wrong func StartGroup(group []*definitions.ServiceDefinition) error { logger.Debugf("Starting services group =>\t%d Services\n", len(group)) for _, srv := range group { logger.Debugf("Telling Docker to start srv =>\t%s\n", srv.Name) if _, err := perform.DockerRun(srv.Service, srv.Operations); err != nil { return fmt.Errorf("StartGroup. Err starting srv =>\t%s:%v\n", srv.Name, err) } } return nil }
func PerformDappActionService(do *definitions.Do, dapp *definitions.Contracts) error { logger.Infof("Performing DAPP Action =>\t%s:%s:%s\n", do.Service.Name, do.Service.Image, do.Service.Command) if _, err := perform.DockerRun(do.Service, do.Operations); err != nil { do.Result = "could not perform dapp action" return err } logger.Infof("Finished performing DAPP Action.\n") return nil }
// EnsureRunning checks if a service is running and starts it if not // TODO: ping all exposed ports until at least one is available (issue #149) // NOTE: does not accept ENV vars func EnsureRunning(do *definitions.Do) error { srv, err := loaders.LoadServiceDefinition(do.Name, false, do.Operations.ContainerNumber) if err != nil { return err } var id string if !IsServiceRunning(srv.Service, srv.Operations) { name := strings.ToUpper(do.Name) logger.Infof("%s is not running. Starting now. Waiting for %s to become available \n", name, name) if id, err = perform.DockerRun(srv.Service, srv.Operations); err != nil { return err } // TODO: to do this right we have to get the bound port // which might be randomly assigned! cont, err := util.DockerClient.InspectContainer(id) if err != nil { return err } exposedPorts := cont.NetworkSettings.Ports MAIN_LOOP: for { // give it a half second and then try all the ports var endpoint string time.Sleep(500 * time.Millisecond) for _, ep := range exposedPorts { for _, p := range ep { endpoint = fmt.Sprintf("%s:%s", p.HostIP, p.HostPort) if _, err := net.Dial("tcp", endpoint); err != nil { time.Sleep(500 * time.Millisecond) } } if _, err := http.Post(endpoint, "", nil); err != nil { time.Sleep(500 * time.Millisecond) } if _, err := http.Get(endpoint); err != nil { time.Sleep(500 * time.Millisecond) } } time.Sleep(500 * time.Millisecond) break MAIN_LOOP } } else { logger.Infof("%s is running.\n", strings.ToUpper(do.Name)) } return nil }
// start a group of chains or services. catch errors on a channel so we can stop as soon as something goes wrong // TODO: Add ONE Chain func StartGroup(ch chan error, wg *sync.WaitGroup, group []*definitions.ServiceDefinition) { logger.Debugf("Starting services group =>\t%d Services\n", len(group)) for _, srv := range group { wg.Add(1) go func(s *definitions.ServiceDefinition) { logger.Debugf("Telling Docker to start srv =>\t%s\n", s.Name) if err := perform.DockerRun(s.Service, s.Operations); err != nil { ch <- fmt.Errorf("StartGroup. Err starting srv =>\t%s:%v\n", s.Name, err) } wg.Done() }(srv) } }
func ImportAction(do *definitions.Do) error { if do.Name == "" { do.Name = strings.Join(do.Args, "_") } fileName := filepath.Join(ActionsPath, strings.Join(do.Args, " ")) if filepath.Ext(fileName) == "" { fileName = fileName + ".toml" } s := strings.Split(do.Path, ":") if s[0] == "ipfs" { var err error //unset 1 as default ContainerNumber, let it take flag? ipfsService, err := loaders.LoadServiceDefinition("ipfs", false, 1) if err != nil { return err } err = perform.DockerRun(ipfsService.Service, ipfsService.Operations) if err != nil { return err } if logger.Level > 0 { err = ipfs.GetFromIPFS(s[1], fileName, "", logger.Writer) } else { err = ipfs.GetFromIPFS(s[1], fileName, "", bytes.NewBuffer([]byte{})) } if err != nil { return err } return nil } if strings.Contains(s[0], "github") { logger.Println("https://twitter.com/ryaneshea/status/595957712040628224") return nil } fmt.Println("I do not know how to get that file. Sorry.") return nil }
func EnsureRunning(do *definitions.Do) error { srv, err := loaders.LoadServiceDefinition(do.Name, false, do.Operations.ContainerNumber) if err != nil { return err } if !IsServiceRunning(srv.Service, srv.Operations) { logger.Infof("%s is not running. Starting now. Waiting for %s to become available \n", strings.ToUpper(do.Name)) time.Sleep(time.Second * 5) // this is dirty err := perform.DockerRun(srv.Service, srv.Operations) if err != nil { return err } } else { logger.Infof("%s is running.\n", strings.ToUpper(do.Name)) } return nil }
func StartChain(do *definitions.Do) error { chain, err := loaders.LoadChainDefinition(do.Name, false, do.Operations.ContainerNumber) if err != nil { logger.Infoln("Cannot start a chain I cannot find.") do.Result = "no file" return nil } if chain.Name == "" { logger.Infoln("Cannot start a chain without a name.") do.Result = "no name" return nil } // boot the dependencies (eg. keys) if err := bootDependencies(chain, do); err != nil { return err } chain.Service.Command = loaders.ErisChainStart util.OverWriteOperations(chain.Operations, do.Operations) chain.Service.Environment = append(chain.Service.Environment, "CHAIN_ID="+chain.ChainID) chain.Service.Environment = append(chain.Service.Environment, do.Env...) if do.Run { chain.Service.Environment = append(chain.Service.Environment, "ERISDB_API=true") } chain.Service.Links = append(chain.Service.Links, do.Links...) logger.Infof("StartChainRaw to DockerRun =>\t%s\n", chain.Service.Name) logger.Debugf("\twith ChainID =>\t\t%v\n", chain.ChainID) logger.Debugf("\twith Environment =>\t%v\n", chain.Service.Environment) logger.Debugf("\twith AllPortsPublshd =>\t%v\n", chain.Operations.PublishAllPorts) if _, err := perform.DockerRun(chain.Service, chain.Operations); err != nil { do.Result = "error" return err } return nil }
func ExportAction(do *definitions.Do) error { _, _, err := LoadActionDefinition(do.Name) if err != nil { return err } //unset 1 as default ContainerNumber, let it take flag? ipfsService, err := loaders.LoadServiceDefinition("ipfs", false, 1) if err != nil { return err } err = perform.DockerRun(ipfsService.Service, ipfsService.Operations) if err != nil { return err } hash, err := exportFile(do.Name) if err != nil { return err } do.Result = hash logger.Println(hash) return nil }
func StartServiceByService(srvMain *definitions.Service, ops *definitions.Operation) error { return perform.DockerRun(srvMain, ops) }
// the main function for setting up a chain container // handles both "new" and "fetch" - most of the differentiating logic is in the container func setupChain(do *definitions.Do, cmd string) (err error) { // XXX: if do.Name is unique, we can safely assume (and we probably should) that do.Operations.ContainerNumber = 1 // do.Name is mandatory if do.Name == "" { return fmt.Errorf("setupChain requires a chainame") } containerName := util.ChainContainersName(do.Name, do.Operations.ContainerNumber) if do.ChainID == "" { do.ChainID = do.Name } // ensure/create data container if !data.IsKnown(containerName) { if err := perform.DockerCreateDataContainer(do.Name, do.Operations.ContainerNumber); err != nil { return fmt.Errorf("Error creating data containr =>\t%v", err) } } else { logger.Debugln("Data container already exists for", do.Name) } logger.Debugf("Chain's Data Contain Built =>\t%s\n", do.Name) // if something goes wrong, cleanup defer func() { if err != nil { logger.Infof("Error on setupChain =>\t\t%v\n", err) logger.Infoln("Cleaning up...") if err2 := RmChain(do); err2 != nil { // maybe be less dramatic err = fmt.Errorf("Tragic! Our marmots encountered an error during setupChain for %s.\nThey also failed to cleanup after themselves (remove containers) due to another error.\nFirst error =>\t\t\t%v\nCleanup error =>\t\t%v\n", containerName, err, err2) } } }() // copy do.Path, do.GenesisFile, do.ConfigFile, do.Priv, do.CSV into container containerDst := path.Join("blockchains", do.Name) // path in container dst := path.Join(DataContainersPath, do.Name, containerDst) // path on host // TODO: deal with do.Operations.ContainerNumbers ....! // we probably need to update Import logger.Debugf("Container destination =>\t%s\n", containerDst) logger.Debugf("Local destination =>\t\t%s\n", dst) if err = os.MkdirAll(dst, 0700); err != nil { return fmt.Errorf("Error making data directory: %v", err) } // we accept two csvs: one for validators, one for accounts // if there's only one, its for validators and accounts var csvFiles []string var csvPaths string if do.CSV != "" { csvFiles = strings.Split(do.CSV, ",") if len(csvFiles) > 1 { csvPath1 := fmt.Sprintf("/home/eris/.eris/blockchains/%s/%s", do.ChainID, "validators.csv") csvPath2 := fmt.Sprintf("/home/eris/.eris/blockchains/%s/%s", do.ChainID, "accounts.csv") csvPaths = fmt.Sprintf("%s,%s", csvPath1, csvPath2) } else { csvPaths = fmt.Sprintf("/home/eris/.eris/blockchains/%s/%s", do.ChainID, "genesis.csv") } } filesToCopy := []stringPair{ {do.Path, ""}, {do.GenesisFile, "genesis.json"}, {do.ConfigFile, "config.toml"}, {do.Priv, "priv_validator.json"}, } if len(csvFiles) == 1 { filesToCopy = append(filesToCopy, stringPair{csvFiles[0], "genesis.csv"}) } else if len(csvFiles) > 1 { filesToCopy = append(filesToCopy, stringPair{csvFiles[0], "validators.csv"}) filesToCopy = append(filesToCopy, stringPair{csvFiles[1], "accounts.csv"}) } if err := copyFiles(dst, filesToCopy); err != nil { return err } // copy from host to container logger.Debugf("Copying Files into DataCont =>\t%s:%s\n", dst, containerDst) importDo := definitions.NowDo() importDo.Name = do.Name importDo.Operations = do.Operations if err = data.ImportData(importDo); err != nil { return err } chain := loaders.MockChainDefinition(do.Name, do.ChainID, false, do.Operations.ContainerNumber) //set maintainer info chain.Maintainer.Name, chain.Maintainer.Email, err = config.GitConfigUser() if err != nil { logger.Debugf(err.Error()) } // write the chain definition file ... fileName := filepath.Join(BlockchainsPath, do.Name) + ".toml" if _, err = os.Stat(fileName); err != nil { if err = WriteChainDefinitionFile(chain, fileName); err != nil { return fmt.Errorf("error writing chain definition to file: %v", err) } } chain, err = loaders.LoadChainDefinition(do.Name, false, do.Operations.ContainerNumber) if err != nil { return err } logger.Debugf("Chain Loaded. Image =>\t\t%v\n", chain.Service.Image) chain.Operations.PublishAllPorts = do.Operations.PublishAllPorts // TODO: remove this and marshall into struct from cli directly // cmd should be "new" or "install" chain.Service.Command = cmd // write the list of <key>:<value> config options as flags buf := new(bytes.Buffer) for _, cv := range do.ConfigOpts { spl := strings.Split(cv, "=") if len(spl) != 2 { return fmt.Errorf("Config options should be <key>=<value> pairs. Got %s", cv) } buf.WriteString(fmt.Sprintf(" --%s=%s", spl[0], spl[1])) } configOpts := buf.String() // set chainid and other vars envVars := []string{ fmt.Sprintf("CHAIN_ID=%s", do.ChainID), fmt.Sprintf("CONTAINER_NAME=%s", containerName), fmt.Sprintf("CSV=%v", csvPaths), // for mintgen fmt.Sprintf("CONFIG_OPTS=%s", configOpts), // config.toml fmt.Sprintf("REGISTER_PUBKEY=%s", do.Address), // use to sign registration txs for etcb } envVars = append(envVars, do.Env...) if do.Run { // run erisdb instead of tendermint envVars = append(envVars, "ERISDB_API=true") } logger.Debugf("Set env vars from setupChain =>\t%v\n", envVars) chain.Service.Environment = append(chain.Service.Environment, envVars...) logger.Debugf("Set links from setupChain =>\t%v\n", do.Links) chain.Service.Links = append(chain.Service.Links, do.Links...) // TODO: if do.N > 1 ... chain.Operations.DataContainerName = util.DataContainersName(do.Name, do.Operations.ContainerNumber) if err := bootDependencies(chain, do); err != nil { return err } logger.Debugf("Starting chain via Docker =>\t%s\n", chain.Service.Name) logger.Debugf("\twith Image =>\t\t%s\n", chain.Service.Image) _, err = perform.DockerRun(chain.Service, chain.Operations) // this err is caught in the defer above return }
// the main function for setting up a chain container // handles both "new" and "fetch" - most of the differentiating logic is in the container func setupChain(do *definitions.Do, cmd string) (err error) { // XXX: if do.Name is unique, we can safely assume (and we probably should) that do.Operations.ContainerNumber = 1 // do.Name is mandatory if do.Name == "" { return fmt.Errorf("setupChain requires a chainame") } containerName := util.ChainContainersName(do.Name, do.Operations.ContainerNumber) if do.ChainID == "" { do.ChainID = do.Name } // do.Run containers and exit (creates data container) if !data.IsKnown(containerName) { if err := perform.DockerCreateDataContainer(do.Name, do.Operations.ContainerNumber); err != nil { return fmt.Errorf("Error creating data containr =>\t%v", err) } } logger.Debugf("Chain's Data Contain Built =>\t%s\n", do.Name) // if something goes wrong, cleanup defer func() { if err != nil { logger.Infof("Error on setupChain =>\t\t%v\n", err) logger.Infoln("Cleaning up...") if err2 := RmChain(do); err2 != nil { err = fmt.Errorf("Tragic! Our marmots encountered an error during setupChain for %s.\nThey also failed to cleanup after themselves (remove containers) due to another error.\nFirst error =>\t\t\t%v\nCleanup error =>\t\t%v\n", containerName, err, err2) } } }() // copy do.Path, do.GenesisFile, config into container containerDst := path.Join("blockchains", do.Name) // path in container dst := path.Join(DataContainersPath, do.Name, containerDst) // path on host // TODO: deal with do.Operations.ContainerNumbers ....! // we probably need to update Import if err = os.MkdirAll(dst, 0700); err != nil { return fmt.Errorf("Error making data directory: %v", err) } if do.Path != "" { if err = Copy(do.Path, dst); err != nil { return err } } if do.GenesisFile != "" { if err = Copy(do.GenesisFile, path.Join(dst, "genesis.json")); err != nil { return err } } else { // TODO: do.Run mintgen and open the do.GenesisFile in editor } if do.ConfigFile != "" { if err = Copy(do.ConfigFile, path.Join(dst, "config."+path.Ext(do.ConfigFile))); err != nil { return err } } // copy from host to container logger.Debugf("Copying Files into DataCont =>\t%s:%s\n", dst, containerDst) importDo := definitions.NowDo() importDo.Name = do.Name importDo.Operations = do.Operations if err = data.ImportData(importDo); err != nil { return err } chain := loaders.MockChainDefinition(do.Name, do.ChainID, false, do.Operations.ContainerNumber) //get maintainer info uName, err := gitconfig.Username() if err != nil { logger.Debugf("Could not find git user.name, setting chain.Maintainer.Name = \"\"") uName = "" } email, err := gitconfig.Email() if err != nil { logger.Debugf("Could not find git user.email, setting chain.Maintainer.Email = \"\"") email = "" } chain.Maintainer.Name = uName chain.Maintainer.Email = email // write the chain definition file ... fileName := filepath.Join(BlockchainsPath, do.Name) + ".toml" if _, err = os.Stat(fileName); err != nil { if err = WriteChainDefinitionFile(chain, fileName); err != nil { return fmt.Errorf("error writing chain definition to file: %v", err) } } chain, err = loaders.LoadChainDefinition(do.Name, false, do.Operations.ContainerNumber) if err != nil { return err } logger.Debugf("Chain Loaded. Image =>\t\t%v\n", chain.Service.Image) chain.Operations.PublishAllPorts = do.Operations.PublishAllPorts // TODO: remove this and marshall into struct from cli directly // cmd should be "new" or "install" chain.Service.Command = cmd // do we need to create our own do.GenesisFile? var genGen bool if do.GenesisFile == "" { genGen = true } // set chainid and other vars envVars := []string{ "CHAIN_ID=" + do.ChainID, "CONTAINER_NAME=" + containerName, fmt.Sprintf("RUN=%v", do.Run), fmt.Sprintf("GENERATE_GENESIS=%v", genGen), } logger.Debugf("Set env vars from setupChain =>\t%v\n", envVars) for _, eV := range envVars { chain.Service.Environment = append(chain.Service.Environment, eV) } // TODO mint vs. erisdb (in terms of rpc) chain.Operations.DataContainerName = util.DataContainersName(do.Name, do.Operations.ContainerNumber) if os.Getenv("TEST_IN_CIRCLE") != "true" { chain.Operations.Remove = true } logger.Debugf("Starting chain via Docker =>\t%s\n", chain.Service.Name) logger.Debugf("\twith Image =>\t\t%s\n", chain.Service.Image) err = perform.DockerRun(chain.Service, chain.Operations) // this err is caught in the defer above return }
// the main function for setting up a chain container // handles both "new" and "fetch" - most of the differentiating logic is in the container func setupChain(do *definitions.Do, cmd string) (err error) { // XXX: if do.Name is unique, we can safely assume (and we probably should) that do.Operations.ContainerNumber = 1 // do.Name is mandatory if do.Name == "" { return fmt.Errorf("setupChain requires a chainame") } containerName := util.ChainContainersName(do.Name, do.Operations.ContainerNumber) if do.ChainID == "" { do.ChainID = do.Name } // ensure/create data container if !data.IsKnown(containerName) { if err := perform.DockerCreateDataContainer(do.Name, do.Operations.ContainerNumber); err != nil { return fmt.Errorf("Error creating data containr =>\t%v", err) } } else { logger.Debugln("Data container already exists for", do.Name) } logger.Debugf("Chain's Data Contain Built =>\t%s\n", do.Name) // if something goes wrong, cleanup defer func() { if err != nil { logger.Infof("Error on setupChain =>\t\t%v\n", err) logger.Infoln("Cleaning up...") if err2 := RmChain(do); err2 != nil { // maybe be less dramatic err = fmt.Errorf("Tragic! Our marmots encountered an error during setupChain for %s.\nThey also failed to cleanup after themselves (remove containers) due to another error.\nFirst error =>\t\t\t%v\nCleanup error =>\t\t%v\n", containerName, err, err2) } } }() // copy do.Path, do.GenesisFile, do.ConfigFile, do.Priv, do.CSV into container containerDst := path.Join("blockchains", do.Name) // path in container dst := path.Join(DataContainersPath, do.Name, containerDst) // path on host // TODO: deal with do.Operations.ContainerNumbers ....! // we probably need to update Import logger.Debugln("container destination:", containerDst) logger.Debugln("local destination:", dst) if err = os.MkdirAll(dst, 0700); err != nil { return fmt.Errorf("Error making data directory: %v", err) } var csvFile, csvPath string if do.CSV != "" { csvFile = "genesis.csv" csvPath = fmt.Sprintf("/home/eris/.eris/blockchains/%s/%s", do.ChainID, csvFile) } if err := copyFiles(dst, []stringPair{ {do.Path, ""}, {do.GenesisFile, "genesis.json"}, {do.ConfigFile, "config.toml"}, {do.Priv, "priv_validator.json"}, {do.CSV, csvFile}, }); err != nil { return err } // copy from host to container logger.Debugf("Copying Files into DataCont =>\t%s:%s\n", dst, containerDst) importDo := definitions.NowDo() importDo.Name = do.Name importDo.Operations = do.Operations if err = data.ImportData(importDo); err != nil { return err } chain := loaders.MockChainDefinition(do.Name, do.ChainID, false, do.Operations.ContainerNumber) //set maintainer info chain.Maintainer.Name, chain.Maintainer.Email, err = config.GitConfigUser() if err != nil { logger.Debugf(err.Error()) } // write the chain definition file ... fileName := filepath.Join(BlockchainsPath, do.Name) + ".toml" if _, err = os.Stat(fileName); err != nil { if err = WriteChainDefinitionFile(chain, fileName); err != nil { return fmt.Errorf("error writing chain definition to file: %v", err) } } chain, err = loaders.LoadChainDefinition(do.Name, false, do.Operations.ContainerNumber) if err != nil { return err } logger.Debugf("Chain Loaded. Image =>\t\t%v\n", chain.Service.Image) chain.Operations.PublishAllPorts = do.Operations.PublishAllPorts // TODO: remove this and marshall into struct from cli directly // cmd should be "new" or "install" chain.Service.Command = cmd // do we need to create our own do.GenesisFile? var genGen bool if do.GenesisFile == "" { genGen = true } // write the list of <key>:<value> config options as flags buf := new(bytes.Buffer) for _, cv := range do.ConfigOpts { spl := strings.Split(cv, "=") if len(spl) != 2 { return fmt.Errorf("Config options should be <key>=<value> pairs. Got %s", cv) } buf.WriteString(fmt.Sprintf(" --%s=%s", spl[0], spl[1])) } configOpts := buf.String() // set chainid and other vars envVars := []string{ fmt.Sprintf("CHAIN_ID=%s", do.ChainID), fmt.Sprintf("CONTAINER_NAME=%s", containerName), fmt.Sprintf("RUN=%v", do.Run), fmt.Sprintf("GENERATE_GENESIS=%v", genGen), fmt.Sprintf("CSV=%v", csvPath), fmt.Sprintf("CONFIG_OPTS=%s", configOpts), } logger.Debugf("Set env vars from setupChain =>\t%v\n", envVars) for _, eV := range envVars { chain.Service.Environment = append(chain.Service.Environment, eV) } // TODO: if do.N > 1 ... chain.Operations.DataContainerName = util.DataContainersName(do.Name, do.Operations.ContainerNumber) if os.Getenv("TEST_IN_CIRCLE") != "true" { chain.Operations.Remove = true } logger.Debugf("Starting chain via Docker =>\t%s\n", chain.Service.Name) logger.Debugf("\twith Image =>\t\t%s\n", chain.Service.Image) err = perform.DockerRun(chain.Service, chain.Operations) // this err is caught in the defer above return }