{"record":{"id":"d54df9d2f31bdf49","repo":"can1357/oh-my-pi","slug":"could-not-create-opt-omp-mkdir-stderr-trim","errorCode":null,"errorMessage":"Could not create /opt/omp: ${mkdir.stderr.trim()}","messagePattern":"Could not create /opt/omp: (.+?)","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/metaharness/src/tb/agent.ts","lineNumber":95,"sourceCode":"\t\t\tif (!(await Bun.file(source).exists())) throw new Error(`Binary build did not produce ${source}`);\n\t\t\tawait Bun.write(destination, Bun.file(source));\n\t\t\tawait fs.chmod(destination, 0o755);\n\t\t}\n\t}\n\n\tconst binaries: AgentBinaries = { version: manifest.version };\n\tfor (const arch of arches) binaries[arch] = cached[arch];\n\treturn binaries;\n}\n\n/** Install omp and gateway-only configuration into one running trial microVM. */\nexport async function installAgent(vm: TrialVm, binaries: AgentBinaries, gateway: GatewayConfig): Promise<string> {\n\tconst binary = binaries[vm.arch];\n\tif (!binary) throw new Error(`No omp binary available for guest architecture ${vm.arch}`);\n\n\tconst entrypoint = \"/opt/omp/omp\";\n\tconst mkdir = await vm.exec(\"mkdir -p /opt/omp\");\n\tif (mkdir.exitCode !== 0) throw new Error(`Could not create /opt/omp: ${mkdir.stderr.trim()}`);\n\tawait vm.copyTo(binary, entrypoint);\n\tconst chmod = await vm.exec(`chmod 755 ${shellQuote(entrypoint)}`);\n\tif (chmod.exitCode !== 0) throw new Error(`Could not make omp executable: ${chmod.stderr.trim()}`);\n\tconst warmup = await vm.exec(`${shellQuote(entrypoint)} --version`);\n\tif (warmup.exitCode !== 0) throw new Error(`omp --version failed: ${warmup.stderr.trim()}`);\n\n\tconst providers = [...new Set(gateway.providers)];\n\tconst modelLines = [\"# Generated by metaharness — auth via host pm2 gateway.\", \"providers:\"];\n\tfor (const provider of providers) {\n\t\tmodelLines.push(`  ${provider}:`);\n\t\tmodelLines.push(`    baseUrl: ${gateway.url}`);\n\t\tmodelLines.push(\"    auth: oauth\");\n\t\tmodelLines.push(\"    transport: pi-native\");\n\t\tmodelLines.push(`    apiKey: ${gateway.token}`);\n\t}\n\tconst modelsYaml = `${modelLines.join(\"\\n\")}\\n`;\n\tconst configYaml = `providers:\n  openrouterVariant: ${gateway.openrouterVariant}","sourceCodeStart":77,"sourceCodeEnd":113,"githubUrl":"https://github.com/can1357/oh-my-pi/blob/969062200754ea02cfac922e5ebb8c608c079e15/packages/metaharness/src/tb/agent.ts#L77-L113","documentation":"installAgent provisions the omp binary inside a trial VM. Before copying the binary it runs `mkdir -p /opt/omp` via vm.exec; a non-zero exit code means the guest could not create the install directory, so this error is thrown with the VM's captured stderr appended for diagnosis.","triggerScenarios":"vm.exec(\"mkdir -p /opt/omp\") returns a non-zero exitCode — e.g. the guest filesystem is read-only, /opt/omp exists as a non-directory, the VM is booted into recovery/rescue mode, or the exec transport itself fails and surfaces a shell error.","commonSituations":"Trial VM images mounted read-only or with a full root disk; a broken snapshot where /opt/omp is a stale file; ssh/exec into the VM failing so stderr carries 'connection refused' style text; hypervisor misconfiguration preventing boot.","solutions":["Read the stderr in the message to identify the guest-side cause","Verify the VM is running and vm.exec can reach it (run a trivial command like `true`)","Check that the guest root filesystem is writable and not full (df -h, touch a file in /)","Ensure /opt/omp does not exist as a regular file or symlink in the VM image","Rebuild or restart the trial VM from a clean image"],"exampleFix":"// before (broken image: /opt/omp is a file)\nconst mkdir = await vm.exec(\"mkdir -p /opt/omp\");\n// after: pre-clean the image or guard in provisioning\nawait vm.exec(\"rm -f /opt/omp && mkdir -p /opt/omp\");","handlingStrategy":"validation","validationCode":"const probe = await vm.exec(\"mkdir -p /opt/omp && test -w /opt/omp\");\nif (probe.exitCode !== 0) throw new Error(`VM /opt not writable: ${probe.stderr.trim()}`);","typeGuard":null,"tryCatchPattern":"try {\n  await installAgent(vm, binaries, gateway);\n} catch (err) {\n  if (String(err.message).includes(\"Could not create /opt/omp\")) {\n    // inspect err.message stderr, reprovision VM\n  }\n  throw err;\n}","preventionTips":["Smoke-test VM writability before provisioning","Use clean VM images without stale /opt/omp artifacts","Monitor guest disk usage"],"tags":["vm","provisioning","filesystem"],"backgroundTag":"vm-exec-command-failed","analyzedSha":"969062200754ea02cfac922e5ebb8c608c079e15","analyzedAt":"2026-08-31T10:29:35.737Z","schemaVersion":2},"datasetVersion":"2026-08-31T14:17:45.589Z"}