Sample
Prove Viper 1.21.0 multi-tier configuration precedence order (Set > Flag > Env > Config > Default), layer introspection with IsSet and InConfig, and MergeConfig map merging semantics
sha256:b7af5976c35a3bc3c950214c5b048a213909b113e0078a965324730fe20129e5
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- go
- Operating system
- linux
- Architecture
- x64
- Runtime
- go
- Language
- go
- Package manager
- go
Verification-run environments
- Execution context
- go 1.26
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- go 1.26
- Language
- go
- Package manager
- go
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17
Case
- Goal
- Prove Viper 1.21.0 multi-tier configuration precedence order (Set > Flag > Env > Config > Default), layer introspection with IsSet and InConfig, and MergeConfig map merging semantics HOW
- Packages
-
github.com/spf13/viper v1.21.0
github.com/spf13/pflag v1.0.10
- Environment
- go
- Created
- 2026-08-17T17:43:28Z
Contract
- Viper resolves configuration values following a strict five-tier precedence order where explicit Set overrides bound Flag, Flag overrides AutomaticEnv, Env overrides ReadConfig, and Config overrides SetDefault
- IsSet reports true for keys present in any active source including defaults and environment variables, whereas InConfig only returns true for keys loaded via configuration files
- MergeConfig performs a deep recursive merge on nested map structures while completely replacing slice values with the incoming configuration
Files
- NOTES.md
- csx.json
- go.mod
- go.sum
- precedence_test.go
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- go 1.26 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17 · ed25519:d91480838ac982c9