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Sync a declarative package list with the pacman package manager
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declpac/openspec/changes/batch-pacman-checks/tasks.md

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1. Setup

  • 1.1 Add github.com/Jguer/dyalpm to go.mod
  • 1.2 Run go mod tidy to fetch dependencies

2. Core Refactoring

  • 2.1 Update PackageInfo struct to add Installed bool field
  • 2.2 Create Pac struct with alpm.Handle instead of just aurCache
  • 2.3 Implement NewPac() that initializes alpm handle and local/sync DBs

3. Package Resolution Algorithm

  • 3.1 Implement buildLocalPkgMap() - iterate localDB.PkgCache() to create lookup map
  • 3.2 Implement checkSyncDBs() - iterate each sync DB's PkgCache() to find packages
  • 3.3 Implement resolvePackages() - unified algorithm:
    • Step 1: Check local DB for all packages (batch)
    • Step 2: Check sync DBs for remaining packages (batch per repo)
    • Step 3: Batch query AUR for remaining packages
    • Step 4: Return error if any package unfound
    • Step 5: Track installed status from local DB

4. Sync and DryRun Integration

  • 4.1 Refactor Sync() function to use new resolution algorithm
  • 4.2 Refactor DryRun() function to use new resolution algorithm
  • 4.3 Preserve AUR batched HTTP calls (existing fetchAURInfo)
  • 4.4 Preserve orphan cleanup logic (CleanupOrphans())

5. Marking Operations

  • 5.1 Keep MarkExplicit() for marking state packages
  • 5.2 After sync, run pacman -D --asdeps on ALL installed packages (simplifies tracking)
  • 5.3 After deps marking, run pacman -D --asexplicit on collected state packages (overrides deps)
  • 5.4 Skip marking operations in dry-run mode

6. Cleanup and Output

  • 6.1 Remove subprocess-based ValidatePackage() implementation
  • 6.2 Remove subprocess-based GetInstalledPackages() implementation
  • 6.3 Update output summary to show installed/removed counts
  • 6.4 In dry-run mode, populate ToInstall and ToRemove lists

7. Testing

  • 7.1 Test with packages in local DB only
  • 7.2 Test with packages in sync DBs only
  • 7.3 Test with AUR packages
  • 7.4 Test with missing packages (should error)
  • 7.5 Test dry-run mode output
  • 7.6 Test orphan detection and cleanup