Refine command resolution and symlink creation (see ChatGPT conversation: https://chatgpt.com/share/6936be2d-952c-800f-a1cd-7ce5438014ff)
This commit is contained in:
Kevin Veen-Birkenbach
132
tests/integration/test_install_repos_integration.md
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132
tests/integration/test_install_repos_integration.md
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# Integration Test: Command Resolution & Link Creation
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**File:** `tests/integration/test_install_repos_integration.py`
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This integration test validates the *end-to-end* behavior of the pkgmgr installation pipeline:
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1. Repository selection
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2. Verification
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3. **Command resolution (`resolve_command_for_repo`)**
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4. **Symlink creation (`create_ink`)**
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5. Installer execution order and skipping rules
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The test sets up **two repositories**:
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| Repository | Environment Condition | Expected Behavior |
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| ------------- | ------------------------------- | ------------------------------------ |
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| `repo-system` | `/usr/bin/tool-system` exists | System binary → **NO symlink** |
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| `repo-nix` | Nix profile contains `tool-nix` | Link → `~/.nix-profile/bin/tool-nix` |
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This confirms that pkgmgr respects system package managers, prefers Nix over fallback logic, and creates or skips symlinks appropriately.
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---
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## 🔧 **Command Selection Flowchart**
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The integration test verifies that pkgmgr follows this exact decision tree:
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```mermaid
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flowchart TD
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A[Start: install_repos()] --> B(resolve_command_for_repo)
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B --> C{Explicit command in repo config?}
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C -- Yes --> C1[Return explicit command]
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C -- No --> D
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D --> E{System binary under /usr/?}
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E -- Yes --> E1[Return None → NO symlink]
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E -- No --> F
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F --> G{Nix profile binary exists?}
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G -- Yes --> G1[Return Nix binary]
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G -- No --> H
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H --> I{Python/non-system PATH binary?}
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I -- Yes --> I1[Return PATH binary]
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I -- No --> J
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J --> K{main.sh/main.py in repo?}
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K -- Yes --> K1[Return fallback script]
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K -- No --> L[Error: No command found]
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L --> X[Abort installation of this repo]
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C1 --> M[create_ink → create symlink]
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G1 --> M
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I1 --> M
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K1 --> M
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E1 --> N[Skip symlink creation]
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```
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The integration test specifically checks branches:
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* **System binary → skip**
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* **Nix binary → create link**
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---
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## 📐 **Behavior Matrix (Simplified Priority Model)**
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| Priority | Layer / Condition | Action | Link Created? |
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| -------- | ------------------------------------- | ----------- | ------------- |
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| 1 | Explicit `command` in repo config | Use it | ✅ Yes |
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| 2 | System binary under `/usr/bin/...` | Respect OS | ❌ No |
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| 3 | Nix profile binary exists | Use it | ✅ Yes |
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| 4 | Non-system PATH binary | Use it | ✅ Yes |
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| 5 | Repo fallback (`main.sh` / `main.py`) | Use it | ✅ Yes |
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| 6 | None of the above | Raise error | ❌ No |
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The integration test hits row **2** and **3**.
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---
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## 🧪 What This Integration Test Ensures
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### ✔ Correct orchestration
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`install_repos()` calls components in the correct sequence and respects outputs from each stage.
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### ✔ Correct command resolution
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The test asserts that:
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* System binaries suppress symlink creation.
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* Nix binaries produce symlinks even if PATH is empty.
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### ✔ Correct linking behavior
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For the Nix repo:
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* A symlink is created under the `bin_dir`.
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* The symlink points exactly to `~/.nix-profile/bin/<identifier>`.
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### ✔ Isolation
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No real system binaries or actual Nix installation are required—the test uses deterministic patches.
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---
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## 🧩 Additional Notes
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* The integration test covers only the *positive Nix case* and the *system binary skip case*.
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More tests can be added later for:
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* Python binary resolution
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* Fallback to `main.py`
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* Error case when no command can be resolved
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* The test intentionally uses a **temporary HOME directory** to simulate isolated Nix profiles.
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---
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## ✅ Summary
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This integration test validates that:
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* **pkgmgr does not overwrite or override system binaries**
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* **Nix takes precedence over PATH-based tools**
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* **The symlink layer works correctly**
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* **The installer pipeline continues normally even when command resolution skips symlink creation**
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The file provides a reliable foundation for confirming that command resolution, linking, and installation orchestration are functioning exactly as designed.
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179
tests/integration/test_install_repos_integration.py
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179
tests/integration/test_install_repos_integration.py
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# tests/integration/test_install_repos_integration.py
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import os
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import tempfile
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import unittest
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from unittest.mock import patch
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import pkgmgr.install_repos as install_module
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from pkgmgr.install_repos import install_repos
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from pkgmgr.installers.base import BaseInstaller
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class DummyInstaller(BaseInstaller):
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"""
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Minimal installer used to ensure that the installation pipeline runs
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without executing any real external commands.
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"""
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layer = None
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def supports(self, ctx):
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return True
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def run(self, ctx):
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return
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class TestInstallReposIntegration(unittest.TestCase):
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@patch("pkgmgr.install_repos.verify_repository")
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@patch("pkgmgr.install_repos.clone_repos")
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@patch("pkgmgr.install_repos.get_repo_dir")
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@patch("pkgmgr.install_repos.get_repo_identifier")
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def test_system_binary_vs_nix_binary(
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self,
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mock_get_repo_identifier,
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mock_get_repo_dir,
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mock_clone_repos,
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mock_verify_repository,
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):
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"""
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Full integration test for high-level command resolution + symlink creation.
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We do NOT re-test all low-level file-system details of
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resolve_command_for_repo here (that is covered by unit tests).
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Instead, we assert that:
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- If resolve_command_for_repo(...) returns None:
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→ install_repos() does NOT create a symlink.
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- If resolve_command_for_repo(...) returns a path:
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→ install_repos() creates exactly one symlink in bin_dir
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that points to this path.
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Concretely:
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- repo-system:
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resolve_command_for_repo(...) → None
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→ no symlink in bin_dir for this repo.
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- repo-nix:
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resolve_command_for_repo(...) → "/nix/profile/bin/repo-nix"
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→ exactly one symlink in bin_dir pointing to that path.
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"""
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# Repositories must have provider/account/repository so that get_repo_dir()
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# does not crash when called from create_ink().
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repo_system = {
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"name": "repo-system",
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"provider": "github.com",
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"account": "dummy",
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"repository": "repo-system",
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}
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repo_nix = {
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"name": "repo-nix",
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"provider": "github.com",
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"account": "dummy",
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"repository": "repo-nix",
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}
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selected_repos = [repo_system, repo_nix]
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all_repos = selected_repos
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with tempfile.TemporaryDirectory() as tmp_base, \
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tempfile.TemporaryDirectory() as tmp_bin:
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# Fake repo directories (what get_repo_dir will return)
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repo_system_dir = os.path.join(tmp_base, "repo-system")
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repo_nix_dir = os.path.join(tmp_base, "repo-nix")
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os.makedirs(repo_system_dir, exist_ok=True)
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os.makedirs(repo_nix_dir, exist_ok=True)
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# Identifiers and repo dirs used inside install_repos()
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mock_get_repo_identifier.side_effect = ["repo-system", "repo-nix"]
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mock_get_repo_dir.side_effect = [repo_system_dir, repo_nix_dir]
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# Repository verification always succeeds
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mock_verify_repository.return_value = (True, [], "commit", "key")
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mock_clone_repos.return_value = None
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# Pretend this is the "Nix binary" path for repo-nix
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nix_tool_path = "/nix/profile/bin/repo-nix"
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# Patch resolve_command_for_repo at the install_repos module level
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with patch("pkgmgr.install_repos.resolve_command_for_repo") as mock_resolve, \
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patch("pkgmgr.install_repos.os.path.exists") as mock_exists_install:
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def fake_resolve_command(repo, repo_identifier: str, repo_dir: str):
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"""
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High-level behavior stub:
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- For repo-system: act as if a system package owns the command
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→ return None (no symlink).
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- For repo-nix: act as if a Nix profile binary is the entrypoint
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→ return nix_tool_path (symlink should be created).
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"""
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if repo_identifier == "repo-system":
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return None
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if repo_identifier == "repo-nix":
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return nix_tool_path
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return None
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def fake_exists_install(path: str) -> bool:
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"""
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Make _ensure_repo_dir() believe that the repo directories
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already exist so that it does not attempt cloning.
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"""
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if path in (repo_system_dir, repo_nix_dir):
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return True
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return False
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mock_resolve.side_effect = fake_resolve_command
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mock_exists_install.side_effect = fake_exists_install
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# Use only DummyInstaller so we focus on link creation, not installer behavior
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old_installers = install_module.INSTALLERS
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install_module.INSTALLERS = [DummyInstaller()]
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try:
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install_repos(
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selected_repos=selected_repos,
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repositories_base_dir=tmp_base,
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bin_dir=tmp_bin,
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all_repos=all_repos,
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no_verification=False,
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preview=False,
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quiet=False,
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clone_mode="shallow",
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update_dependencies=False,
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)
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finally:
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install_module.INSTALLERS = old_installers
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# ------------------------------------------------------------------
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# Inspect bin_dir: exactly one symlink must exist, pointing to Nix.
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# ------------------------------------------------------------------
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symlink_paths = []
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for entry in os.listdir(tmp_bin):
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full = os.path.join(tmp_bin, entry)
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if os.path.islink(full):
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symlink_paths.append(full)
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# There must be exactly one symlink (for repo-nix)
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self.assertEqual(
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len(symlink_paths),
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1,
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f"Expected exactly one symlink in {tmp_bin}, found {symlink_paths}",
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)
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target = os.readlink(symlink_paths[0])
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# That symlink must point to the "Nix" path returned by the resolver stub
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self.assertEqual(
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target,
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nix_tool_path,
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f"Expected symlink target to be Nix binary {nix_tool_path}, got {target}",
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)
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if __name__ == "__main__":
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unittest.main()
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@@ -98,6 +98,11 @@ class TestRecursiveCapabilitiesIntegration(unittest.TestCase):
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The installers' supports() are forced to True so that only the
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capability-shadowing logic decides whether they are skipped.
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The installers' run() methods are patched to avoid real commands.
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NOTE:
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We patch resolve_command_for_repo() to always return a dummy
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command path so that command resolution does not interfere with
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capability-layering tests.
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"""
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if selected_repos is None:
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repo = {}
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@@ -128,7 +133,8 @@ class TestRecursiveCapabilitiesIntegration(unittest.TestCase):
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patch.object(install_mod, "get_repo_dir", return_value=repo_dir), \
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patch.object(install_mod, "verify_repository", return_value=(True, [], None, None)), \
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patch.object(install_mod, "create_ink"), \
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patch.object(install_mod, "clone_repos"):
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patch.object(install_mod, "clone_repos"), \
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patch.object(install_mod, "resolve_command_for_repo", return_value="/bin/dummy"):
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install_repos(
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selected_repos=selected_repos,
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@@ -144,6 +150,7 @@ class TestRecursiveCapabilitiesIntegration(unittest.TestCase):
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return called_installers
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# ------------------------------------------------------------------
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# Scenario 1: Only Makefile with install target
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# ------------------------------------------------------------------
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