# Docker Build Fix — Swagger docs.go Not Found

## TL;DR

> **Quick Summary**: The Swagger-generated file `docs/docs.go` is `.gitignore`-d, so Docker build fails with `no required module provides package .../docs`. Fix: add `swag init` step in the Dockerfile builder stage so docs are generated during build before compilation.
>
> **Deliverables**:
> - Dockerfile updated with `swag init` before `go build`
> - Docker build succeeds without error
>
> **Estimated Effort**: Trivial (single-line addition)
> **Parallel Execution**: N/A (single task)

---

## Context

### Original Request
Docker build fails with:
```
main.go:17:2: no required module provides package git.datadunia.com/nexusguard/nexus-server-core/docs
```

Root cause: `apps/server-core/.gitignore` (lines 40-43) ignores `docs/docs.go`, `docs/swagger.json`, `docs/swagger.yaml`. These files were generated locally by `swag init` but are gitignored. When `docker build` runs `COPY . .`, these files are not included, so the Go compilation fails because `main.go` has `_ "git.datadunia.com/nexusguard/nexus-server-core/docs"`.

### Metis Analysis
- Must pin swag CLI version to match `go.mod`: `v1.16.6`
- Must keep `.gitignore` as-is (generated files should not be tracked)
- No other files cause similar issues — audit confirmed
- Build tag approach is unnecessary complexity

---

## Work Objectives

### Core Objective
Make Docker build succeed with Swagger docs generated during build process.

### Must Have
- [ ] `apps/server-core/Dockerfile` runs `swag init` before `go build`
- [ ] `swag init` uses pinned CLI version matching `go.mod` (`v1.16.6`)
- [ ] `docker compose build server-core` passes

### Must NOT Have
- Do NOT remove swagger files from `.gitignore`
- Do NOT restructure `main.go` with build tags
- Do NOT modify Makefile or any other files

---

## Execution Strategy

Single task, no waves needed.

---

## TODOs

- [ ] 1. Fix Dockerfile — Add `swag init` in builder stage

  **What to do**:
  - Edit `apps/server-core/Dockerfile`
  - Between `COPY . .` and `RUN CGO_ENABLED=0 go build -o /app/server-core .`, add:
    ```dockerfile
    RUN go install github.com/swaggo/swag/cmd/swag@v1.16.6 && swag init -g main.go --parseDependency --parseInternal
    ```
  - This runs `swag` CLI pinned to v1.16.6 (matching `go.mod`), generates `docs/docs.go`, then Go compliation finds the package.

  **Final Dockerfile should look like:**
  ```dockerfile
  # Stage 1: Builder
  FROM golang:1.25-alpine AS builder
  WORKDIR /app
  COPY go.mod go.sum ./
  RUN go mod download
  COPY . .
  RUN go install github.com/swaggo/swag/cmd/swag@v1.16.6 && swag init -g main.go --parseDependency --parseInternal
  RUN CGO_ENABLED=0 go build -o /app/server-core .
  ```

  **Recommended Agent Profile**:
  - **Category**: `quick`
  - **Skills**: `[]`

  **Parallelization**: Single task

  **References**:
  - `apps/server-core/Dockerfile` — Current Dockerfile (multi-stage, golang:1.25-alpine)
  - `apps/server-core/.gitignore:40-43` — Lines that gitignore swagger output
  - `apps/server-core/main.go:17` — Import of `_ "docs"` package

  **Acceptance Criteria**:
  - [ ] `docker build -f apps/server-core/Dockerfile -t test-fix apps/server-core` succeeds (exit 0)
  - [ ] Swagger route `/swagger/index.html` works when container runs

  **QA Scenarios**:

  ```
  Scenario: Docker build succeeds with swagger docs generated
    Tool: Bash
    Preconditions: Docker is installed, at project root
    Steps:
      1. docker build -f apps/server-core/Dockerfile -t nexusguard-server-core apps/server-core
      2. echo "Exit: $?"
    Expected Result: Build completes without errors (exit 0)
    Failure Indicators: Error about missing docs package
    Evidence: .sisyphus/evidence/task-1-docker-build-success.txt

  Scenario: Make not installed — fallback works
    Tool: Bash
    Preconditions: make is NOT installed (simulate with `which make || true`)
    Steps:
      1. docker compose build server-core
      2. docker compose up -d
    Expected Result: Services start without requiring `make`
    Failure Indicators: `make: command not found` blocks deployment
    Evidence: .sisyphus/evidence/task-1-direct-docker-compose.txt
  ```

---

## Final Verification

- [ ] F1. **Verify Docker Build** — Run `docker build` and confirm exit 0
- [ ] F2. **Verify Swagger** — Start container, `curl http://localhost:8080/swagger/index.html` returns 200
- [ ] F3. **Verify Clean Environment** — Simulate fresh clone + build

---

## Commit Strategy

- **1**: `fix(server-core): generate swagger docs in Docker build step`

---

## Success Criteria

```bash
# Fix: Docker build
docker build -f apps/server-core/Dockerfile -t nexusguard-server-core apps/server-core
# Expected: Build successful, exit 0

# Verify no more make dependency
docker compose build server-core && docker compose up -d
# Expected: Services start
```