feat: find the config file without an explicit -config

[maqeel75]

Why

pgedge-coldfront installs a config at /etc/pgedge/coldfront/config.yaml, but nothing ever looks there. cmd/archiver defaulted to the relative config.yaml with no fallback search, so an RPM install has to
pass -config /etc/pgedge/coldfront/config.yaml every time — the packaged file's purpose was never wired up.

What

internal/config gains a search path, used by the new LoadDefault:

-config flag → $COLDFRONT_CONFIG → ./config.yaml → /etc/pgedge/coldfront/config.yaml

A file the operator names must exist — falling through would silently run against a different database or object store, so that's an error. Only the implicit chain falls through, and when nothing is found
the error lists what was tried.

Notes for review

Two places this would have been dead code, both found by running the built binary rather than the tests:

• cmd/archiver defaulted the flag to "config.yaml", so every call looked explicit and never reached discovery. Now "".
• internal/partcfg gated loading on *cfgPath != "". It now discovers when neither --dsn nor --config is given, still fails loudly on a named missing file, and keeps the original "pass --dsn or --config"
  message when there's no config anywhere.

.golangci.yml: gosec flags os.Getenv → os.Stat as G703. The existing G304 exclusion for this file covers the same rationale, so it's extended to "G304|G703" rather than adding a nolint.

The compactor still requires -config — separate module, and importing internal/config would pull ColdFront's dependency tree into the one that exists to quarantine it.

Testing

9 new tests, written before the implementation: precedence, missing explicit paths, both fallbacks, a directory at the config path, and the candidate list in the error.

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• cmd/partitioner/main.go
• internal/config/config.go
• internal/config/config_test.go
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🚧 Files skipped from review as they are similar to previous changes (3)

• internal/partcfg/commands.go
• internal/config/config_test.go
• internal/config/config.go

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📝 Walkthrough

Walkthrough

Changes

Configuration Discovery

Layer / File(s)	Summary
Configuration resolution and validation internal/config/config.go, internal/config/config_test.go	Added ordered resolution for explicit, environment, local, and packaged configuration paths. Added ErrNoConfig, regular-file and readability checks, error preservation, and coverage for fallback and failure cases.
Command and partitioner integration cmd/archiver/main.go, cmd/partitioner/main.go, internal/partcfg/commands.go	Updated commands to use config.LoadDefault. Import help documents discovery paths, preserves configuration errors, and reports missing tables without embedding a path.
Security configuration .golangci.yml	Expanded the gosec exclusion for supported configuration paths to include G304 and G703.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: ⚪ Minimal · up to 1b208

This change adds ordered default configuration discovery with validation of candidate files and clearer configuration errors. No concrete merge-blocking risk remains identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 21 functions across 5 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: default configuration discovery without an explicit -config path.
Description check	✅ Passed	The description directly explains the configuration search order, explicit and implicit path behavior, affected components, lint update, and tests.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
In `@cmd/partitioner/main.go`:
- Line 52: Update the config flag description in main to match the current
required explicit-path behavior enforced by the empty-config guard, removing the
unreachable environment and fallback path claims while preserving the
required-config help text.

In `@internal/config/config.go`:
- Around line 164-167: Update the file validation logic in Load to require
info.Mode().IsRegular(), then successfully open the file before returning nil;
reject non-regular or unreadable paths so fallback handling remains available.

In `@internal/partcfg/commands.go`:
- Line 114: Update the LoadDefault flow around the cfgPath switch and addConn so
errors from a discovered default configuration are returned unchanged, including
parse and validation failures. Suppress only the typed “no configuration
candidate found” error from Resolve; do not let an empty --config value cause
addConn to replace other configuration errors with “a connection is required.”
- Around line 879-881: Update the import command’s --config flag description and
usage text to mark the flag as optional, document the configuration discovery
order supported by config.LoadDefault when given an empty path, and remove
wording that requires --config. Locate the flag definition and help text
associated with the import command.

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