{"record":{"id":"cb9584fab639e4db","repo":"hyperledger/fabric","slug":"error-attaching-to-container-s","errorCode":null,"errorMessage":"Error attaching to container: %s","messagePattern":"Error attaching to container: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"core/chaincode/platforms/util/utils.go","lineNumber":128,"sourceCode":"\t\tDestinationPath:           \"/chaincode/input\",\n\t\tContent:                   opts.InputStream,\n\t\tAllowOverwriteDirWithFile: true,\n\t})\n\tif err != nil {\n\t\treturn fmt.Errorf(\"Error uploading input to container: %s\", err)\n\t}\n\n\t// -----------------------------------------------------------------------------------\n\t// Attach stdout buffer to capture possible compilation errors\n\t// -----------------------------------------------------------------------------------\n\tcw, err := client.ContainerAttach(context.Background(), container.ID, dcli.ContainerAttachOptions{\n\t\tStream: true,\n\t\tStdout: true,\n\t\tStderr: true,\n\t\tLogs:   true,\n\t})\n\tif err != nil {\n\t\treturn fmt.Errorf(\"Error attaching to container: %s\", err)\n\t}\n\n\t// -----------------------------------------------------------------------------------\n\t// Launch the actual build, realizing the Env/Cmd specified at container creation\n\t// -----------------------------------------------------------------------------------\n\t_, err = client.ContainerStart(context.Background(), container.ID, dcli.ContainerStartOptions{})\n\tif err != nil {\n\t\tbuff, _ := io.ReadAll(cw.Reader)\n\t\tcw.Close()\n\t\treturn fmt.Errorf(\"Error executing build: %s \\\"%s\\\"\", err, string(buff))\n\t}\n\n\t// -----------------------------------------------------------------------------------\n\t// Wait for the build to complete and gather the return value\n\t// -----------------------------------------------------------------------------------\n\tresWait := client.ContainerWait(context.Background(), container.ID, dcli.ContainerWaitOptions{})\n\tvar res dcontainer.WaitResponse\n\tselect {","sourceCodeStart":110,"sourceCodeEnd":146,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/core/chaincode/platforms/util/utils.go#L110-L146","documentation":"DockerBuild attaches to the ephemeral container to capture stdout/stderr (compiler errors) via client.ContainerAttach. This error means the attach call failed, so build output cannot be captured; the function aborts before starting the build. The docker API error is embedded via %s.","triggerScenarios":"ContainerAttach returns an error: container already stopped/exited, daemon connection issues, or invalid attach options for the container state.","commonSituations":"Builder container exiting immediately (bad entrypoint/image) before attach completes; docker daemon restarts; socket permission problems for the peer process.","solutions":["Check the embedded docker error and daemon logs for the attach failure","Ensure the builder image/container remains running until the build starts","Verify the peer can access the docker daemon socket/endpoint","Retry the build; transient daemon issues often resolve"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// ensure the container is still running before attach\ninsp, err := client.ContainerInspect(ctx, containerID)\nif err == nil && !insp.State.Running && !insp.State.Created {\n    return fmt.Errorf(\"builder container %s not attachable (state=%s)\", containerID, insp.State.Status)\n}","typeGuard":null,"tryCatchPattern":"if err != nil && strings.Contains(err.Error(), \"Error attaching to container\") {\n    logger.Errorf(\"attach failed: %s — check daemon socket perms and container state\", err)\n    return err\n}","preventionTips":["Grant the peer process access to the docker socket/endpoint","Use builder images whose entrypoint does not exit immediately","Watch for daemon restarts during build windows","Capture daemon logs when attach failures recur"],"tags":["docker","container","attach","logging"],"backgroundTag":"container-attach-failed","analyzedSha":"2736b63f8fd5932511d56fe68b7039d15977f7f6","analyzedAt":"2026-09-04T08:52:36.465Z","contentChangedAt":"2026-09-04T08:52:36.465Z","schemaVersion":2},"datasetVersion":"2026-09-08T15:18:49.778Z"}