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nix/doc/manual/source/protocols/json/schema/build-result-v1.yaml
2025-11-03 18:25:16 -05:00

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"$schema": "http://json-schema.org/draft-04/schema"
"$id": "https://nix.dev/manual/nix/latest/protocols/json/schema/build-result-v1.json"
title: Build Result
description: |
This schema describes the JSON representation of Nix's `BuildResult` type, which represents the result of building a derivation or substituting store paths.
Build results can represent either successful builds (with built outputs) or various types of failures.
oneOf:
- "$ref": "#/$defs/success"
- "$ref": "#/$defs/failure"
type: object
required:
- success
- status
properties:
timesBuilt:
type: integer
minimum: 0
title: Times built
description: |
How many times this build was performed.
startTime:
type: integer
minimum: 0
title: Start time
description: |
The start time of the build (or one of the rounds, if it was repeated), as a Unix timestamp.
stopTime:
type: integer
minimum: 0
title: Stop time
description: |
The stop time of the build (or one of the rounds, if it was repeated), as a Unix timestamp.
cpuUser:
type: integer
minimum: 0
title: User CPU time
description: |
User CPU time the build took, in microseconds.
cpuSystem:
type: integer
minimum: 0
title: System CPU time
description: |
System CPU time the build took, in microseconds.
"$defs":
success:
type: object
title: Successful Build Result
description: |
Represents a successful build with built outputs.
required:
- success
- status
- builtOutputs
properties:
success:
const: true
title: Success indicator
description: |
Always true for successful build results.
status:
type: string
title: Success status
description: |
Status string for successful builds.
enum:
- "Built"
- "Substituted"
- "AlreadyValid"
- "ResolvesToAlreadyValid"
builtOutputs:
type: object
title: Built outputs
description: |
A mapping from output names to their build trace entries.
additionalProperties:
"$ref": "build-trace-entry-v1.yaml"
failure:
type: object
title: Failed Build Result
description: |
Represents a failed build with error information.
required:
- success
- status
- errorMsg
properties:
success:
const: false
title: Success indicator
description: |
Always false for failed build results.
status:
type: string
title: Failure status
description: |
Status string for failed builds.
enum:
- "PermanentFailure"
- "InputRejected"
- "OutputRejected"
- "TransientFailure"
- "CachedFailure"
- "TimedOut"
- "MiscFailure"
- "DependencyFailed"
- "LogLimitExceeded"
- "NotDeterministic"
- "NoSubstituters"
- "HashMismatch"
errorMsg:
type: string
title: Error message
description: |
Information about the error if the build failed.
isNonDeterministic:
type: boolean
title: Non-deterministic flag
description: |
If timesBuilt > 1, whether some builds did not produce the same result.
Note that 'isNonDeterministic = false' does not mean the build is deterministic,
just that we don't have evidence of non-determinism.