{"record":{"id":"bba6f903ef19ac39","repo":"can1357/oh-my-pi","slug":"could-not-make-omp-executable-chmod-stderr-trim","errorCode":null,"errorMessage":"Could not make omp executable: ${chmod.stderr.trim()}","messagePattern":"Could not make omp executable: (.+?)","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/metaharness/src/tb/agent.ts","lineNumber":98,"sourceCode":"\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}\nmodelRoles:\n  vision: openrouter/qwen/qwen3.7-flash\nedit:","sourceCodeStart":80,"sourceCodeEnd":116,"githubUrl":"https://github.com/can1357/oh-my-pi/blob/969062200754ea02cfac922e5ebb8c608c079e15/packages/metaharness/src/tb/agent.ts#L80-L116","documentation":"After copying the omp binary to /opt/omp/omp, installAgent runs `chmod 755` on it inside the VM. A non-zero exit means the binary could not be made executable, and this error is thrown with the guest's stderr.","triggerScenarios":"vm.exec(`chmod 755 ${shellQuote(entrypoint)}`) exits non-zero — binary not present at the path (copyTo silently failed or wrong path), chmod unsupported by the guest filesystem (e.g. FAT/9p mount), or permission denied on /opt/omp/omp ownership.","commonSituations":"Guest mounts /opt from a filesystem that ignores/forbids permission bits; copyTo wrote the binary to a different path than expected; running as an unprivileged user without ownership of the file.","solutions":["Check stderr: 'No such file' means copyTo failed — verify the source binary and copy path","Ensure the guest filesystem supports POSIX permissions (use ext4/overlayfs, not a shared vfat mount)","Confirm the exec user owns /opt/omp/omp or is root","Re-run installAgent after fixing; the chmod is idempotent"],"exampleFix":"// before: copy lands on a perms-ignoring shared mount\nawait vm.copyTo(binary, entrypoint);\n// after: copy into a native guest path\nconst entrypoint = \"/opt/omp/omp\";\nawait vm.exec(\"mkdir -p /opt/omp\");\nawait vm.copyTo(binary, entrypoint);\nawait vm.exec(\"chmod 755 /opt/omp/omp || (chown root:root /opt/omp/omp && chmod 755 /opt/omp/omp)\");","handlingStrategy":"validation","validationCode":"const probe = await vm.exec(\"touch /opt/omp/.wtest && rm /opt/omp/.wtest && chmod +x /opt/omp/.wtest 2>/dev/null; echo ok\");\nif (probe.exitCode !== 0) throw new Error(\"guest fs does not support exec permissions\");","typeGuard":null,"tryCatchPattern":"try {\n  await installAgent(vm, binaries, gateway);\n} catch (err) {\n  if (String(err.message).includes(\"Could not make omp executable\")) {\n    // verify copyTo path and guest filesystem type\n  }\n  throw err;\n}","preventionTips":["Copy binaries to POSIX-permission-supporting guest paths","Verify copyTo succeeded before chmod (stat the file)","Run provisioning as root in the guest"],"tags":["vm","permissions","filesystem"],"backgroundTag":"chmod-permission-denied","analyzedSha":"969062200754ea02cfac922e5ebb8c608c079e15","analyzedAt":"2026-08-31T10:29:35.737Z","schemaVersion":2},"datasetVersion":"2026-08-31T14:17:45.589Z"}