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  1. 3
      .gitignore
  2. 674
      LICENSE
  3. 219
      README.md
  4. 90
      cmd/declpac/main.go
  5. 4
      go.mod
  6. 2
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  7. 4
      openspec/changes/declpac-cli-tool/design.md
  8. 1
      openspec/changes/declpac-cli-tool/proposal.md
  9. 2
      openspec/changes/declpac-cli-tool/specs/aur-sync/spec.md
  10. 49
      openspec/changes/declpac-cli-tool/specs/dry-run/spec.md
  11. 141
      openspec/changes/declpac-cli-tool/tasks.md
  12. 2
      openspec/changes/use-dyalpm-and-batch-explicit/.openspec.yaml
  13. 67
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  14. 28
      openspec/changes/use-dyalpm-and-batch-explicit/proposal.md
  15. 16
      openspec/changes/use-dyalpm-and-batch-explicit/specs/batch-explicit-mark/spec.md
  16. 47
      openspec/changes/use-dyalpm-and-batch-explicit/specs/dyalpm-package-query/spec.md
  17. 36
      openspec/changes/use-dyalpm-and-batch-explicit/tasks.md
  18. 66
      pkg/input/input.go
  19. 9
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  20. 27
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  21. 380
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  22. 134
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@ -30,6 +30,3 @@ go.work.sum
# Editor/IDE
# .idea/
# .vscode/
# Binary output
declpac

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LICENSE
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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
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above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

219
README.md
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@ -1,222 +1,9 @@
# declpac
`declpac` is a declarative package manager for Arch Linux that syncs your system
with a declared package list using `pacman`. It ensures your system matches your
desired state, handling package installation, upgrades, and orphan cleanup
automatically.
`declpac` syncs a declarative package list with the `pacman` package manager.
## Features
- **Declarative state management** — Define your desired package list in files or stdin
- **Automatic dependency resolution** — Pacman handles transitive dependencies
- **Smart orphan cleanup** — Removes packages no longer needed
- **Explicit package tracking** — Marks your declared packages as explicit
- **AUR support** — Falls back to AUR for packages not in official repos
- **Machine-readable output** — Perfect for scripting and automation
## Installation
### Build from Source
```bash
git clone https://github.com/Riyyi/declpac.git
cd declpac
go build -o declpac ./cmd/declpac
sudo mv declpac /usr/local/bin/
```
## Building
### Dependencies
- Go 1.21+
- pacman (system package manager)
- aur (AUR helper, optional for AUR support)
- Root privileges (required for pacman operations)
## Usage
### Basic Usage
```bash
# Single state file
sudo declpac --state packages.txt
# Multiple state files
sudo declpac --state base.txt --state apps.txt
# From stdin
cat packages.txt | sudo declpac
```
### State File Format
State files contain one package name per line:
```
bash
vim
git
docker
```
Lines are treated as package names with whitespace trimmed:
```
bash # bash
vim # vim
# comment # ignored
```
### Command Line Options
| Flag | Alias | Description |
|------|-------|-------------|
| `--state` | `-s` | State file(s) to read package list from (can be used multiple times) |
| `--yes` | `-y` | Skip confirmation prompts (for scripting) |
| `--dry-run` | | Simulate sync without making changes |
| `--help` | `-h` | Show help message |
### Examples
#### Minimal System
```bash
# Create a minimal system package list
echo -e "base\nbase-devel\nlinux-headers\nvim\ngit\ncurl\nwget" > ~/.config/declpac/minimal.txt
# Apply the state
sudo declpac --state ~/.config/declpac/minimal.txt
```
#### Development Environment
```bash
# development.txt
go
nodejs
python
rust
docker
docker-compose
kubectl
helm
terraform
# Apply
sudo declpac --state development.txt
```
#### Full System Sync
```bash
# Combine multiple files
sudo declpac --state ~/.config/declpac/base.txt --state ~/.config/declpac/desktop.txt
# Or use stdin
cat ~/.config/declpac/full-system.txt | sudo declpac
```
#### Dry-Run Preview
```bash
# Preview what would happen without making changes
sudo declpac --dry-run --state packages.txt
# Example output:
# Installed 3 packages, removed 2 packages
# Would install: vim, git, docker
# Would remove: python2, perl-xml-parser
```
## How It Works
1. **Collect packages** — Reads from all `--state` files and stdin
2. **Merge** — Combines all packages additively (duplicates allowed)
3. **Validate** — Checks packages exist in repos or AUR
4. **Mark explicit** — Marks declared packages as explicit dependencies
5. **Sync** — Runs `pacman -Syu` to install/upgrade packages
6. **Cleanup** — Removes orphaned packages with `pacman -Rns`
7. **Report** — Outputs summary: `Installed X packages, removed Y packages`
### Database Freshness
If the pacman database is older than 24 hours, `declpac` automatically refreshes it with `pacman -Syy` before validation.
### Orphan Cleanup
After syncing, `declpac` identifies and removes packages that are:
- Not explicitly installed
- Not required by any other package
This keeps your system clean from dependency artifacts.
## Output Format
```
# Success (packages installed/removed)
Installed 5 packages, removed 2 packages
# Success (no changes)
Installed 0 packages, removed 0 packages
# Error
error: package not found: <package-name>
```
### Exit Codes
| Code | Meaning |
|------|---------|
| 0 | Success |
| 1 | Error (no packages, validation failure, pacman error) |
## Security Considerations
- **Run as root** — `declpac` requires root privileges for pacman operations
- **Review state files** — Only install packages from trusted sources
- **Backup** — Consider backing up your system before major changes
## Troubleshooting
### "Permission denied"
`declpac` requires root privileges. Use `sudo`:
```bash
sudo declpac --state packages.txt
```
### "Package not found"
The package doesn't exist in pacman repos or AUR. Check the package name:
```bash
pacman -Ss <package>
```
### Database sync fails
Refresh manually:
```bash
sudo pacman -Syy
```
## File Structure
```
declpac/
├── cmd/declpac/
│ └── main.go # Entry point
├── pkg/
│ ├── input/ # State file/stdin reading
│ ├── merge/ # Package merging
│ ├── validation/ # Package validation
│ ├── pacman/ # Pacman integration
│ └── output/ # Output formatting
├── go.mod # Go module
└── README.md # This file
```
## License
GPL-3.0
- go

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cmd/declpac/main.go
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@ -1,90 +0,0 @@
package main
import (
"context"
"fmt"
"os"
"github.com/urfave/cli/v3"
"github.com/Riyyi/declpac/pkg/input"
"github.com/Riyyi/declpac/pkg/merge"
"github.com/Riyyi/declpac/pkg/output"
"github.com/Riyyi/declpac/pkg/pacman"
"github.com/Riyyi/declpac/pkg/validation"
)
type Config struct {
StateFiles []string
NoConfirm bool
DryRun bool
}
func main() {
cfg := &Config{}
cmd := &cli.Command{
Name: "declpac",
Usage: "Declarative pacman package manager",
Flags: []cli.Flag{
&cli.StringSliceFlag{
Name: "state",
Aliases: []string{"s"},
Usage: "State file(s) to read package list from",
Destination: &cfg.StateFiles,
},
&cli.BoolFlag{
Name: "yes",
Aliases: []string{"y"},
Usage: "Skip confirmation prompts",
Destination: &cfg.NoConfirm,
},
&cli.BoolFlag{
Name: "dry-run",
Usage: "Simulate the sync without making changes",
Destination: &cfg.DryRun,
},
},
Action: func(ctx context.Context, cmd *cli.Command) error {
return run(cfg)
},
}
if err := cmd.Run(context.Background(), os.Args); err != nil {
os.Exit(1)
}
}
func run(cfg *Config) error {
packages, err := input.ReadPackages(cfg.StateFiles)
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
return err
}
merged := merge.Merge(packages)
if err := validation.Validate(merged); err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
return err
}
if cfg.DryRun {
result, err := pacman.DryRun(merged)
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
return err
}
fmt.Println(output.Format(result))
return nil
}
result, err := pacman.Sync(merged)
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
return err
}
fmt.Println(output.Format(result))
return nil
}

4
go.mod
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@ -3,5 +3,7 @@ module github.com/Riyyi/declpac
go 1.26.2
require (
github.com/urfave/cli/v3 v3.8.0
github.com/Jguer/aur v1.3.0 // indirect
github.com/Jguer/dyalpm v0.1.2 // indirect
github.com/ebitengine/purego v0.10.0 // indirect
)

2
go.sum
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@ -4,5 +4,3 @@ github.com/Jguer/dyalpm v0.1.2 h1:Gl0+GDWBQmo3DSsfzTPnKqCwYqcroq0j6kAtsIUkpUw=
github.com/Jguer/dyalpm v0.1.2/go.mod h1:FpcWwU1eYHVWMKmr/yHFqHYKsS+qGKCtk/FIXirj2MY=
github.com/ebitengine/purego v0.10.0 h1:QIw4xfpWT6GWTzaW5XEKy3HXoqrJGx1ijYHzTF0/ISU=
github.com/ebitengine/purego v0.10.0/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
github.com/urfave/cli/v3 v3.8.0 h1:XqKPrm0q4P0q5JpoclYoCAv0/MIvH/jZ2umzuf8pNTI=
github.com/urfave/cli/v3 v3.8.0/go.mod h1:ysVLtOEmg2tOy6PknnYVhDoouyC/6N42TMeoMzskhso=

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@ -77,7 +77,7 @@ package list, with all packages at their latest available versions.
**AUR Integration**
- First attempt: Try pacman -Syu for all packages (includes AUR auto-install if enabled)
- For packages not found in pacman repos: Batch query AUR via info endpoint (single HTTP request for multiple packages)
- For packages not found in pacman repos: Check AUR via Jguer/aur library
- If package in AUR: Build and install with makepkg (no AUR helpers)
- AUR packages should also upgrade to latest version (no partial updates)
- Clone AUR git repo to temp directory
@ -110,12 +110,10 @@ package list, with all packages at their latest available versions.
- Multiple --state flags allowed, all additive
- Stdin input via standard input stream
- No interactive prompts - fully automated
- `--dry-run`: Simulate sync without making changes, print what would be installed/removed
**Output Format**
- Success: Print to stdout: `Installed X packages, removed Y packages`
- No changes: Print `Installed 0 packages, removed 0 packages`
- Dry-run: Print `Installed X packages, removed Y packages` with `Would install: ...` and `Would remove: ...` lines
- Errors: Print error message to stderr
- Exit codes: 0 for success, 1 for errors

1
openspec/changes/declpac-cli-tool/proposal.md
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@ -19,7 +19,6 @@ list, ensuring all packages are at the latest version.
- Machine-readable output (install/remove counts, exit codes)
- No conflict resolution for missing packages (append-only)
- Print error to stderr for empty state input and exit with code 1
- Dry-run mode: simulate sync without making changes, show what would be installed/removed
## Capabilities

2
openspec/changes/declpac-cli-tool/specs/aur-sync/spec.md
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@ -12,7 +12,7 @@ latest versions.
#### Scenario: Fall back to AUR
- **WHEN** package is not in pacman repositories but is in AUR
- **THEN** batch query AUR via info endpoint (multiple packages in single request)
- **THEN** query AUR via Jguer/aur library
- **AND** build and install with makepkg -si
#### Scenario: Upgrade AUR packages

49
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@ -1,49 +0,0 @@
# Dry-Run Mode
## Summary
Add `--dry-run` flag to simulate the sync operation without making any changes
to the system. Shows what packages would be installed and what would be removed.
## Motivation
Users want to preview the effects of a sync operation before committing changes.
This is useful for:
- Verifying the intended changes are correct
- Avoiding unintended package installations
- Understanding what orphan cleanup will remove
## Interface
```
declpac --dry-run --state packages.txt
```
## Behavior
1. Read state files and stdin (same as normal mode)
2. Validate packages exist (same as normal mode)
3. Query current installed packages via `pacman -Qq`
4. Compare declared packages to current state
5. Identify packages that would be installed (not currently installed)
6. Identify orphans that would be removed via `pacman -Qdtq`
7. Output results with "Would install:" and "Would remove:" sections
## Output Format
```
Installed 3 packages, removed 2 packages
Would install: vim, git, docker
Would remove: python2, perl-xml-parser
```
## Non-Goals
- Actual package operations (no pacman -Syu, no pacman -Rns execution)
- Package version comparison
- Detailed dependency analysis
## Trade-offs
- Doesn't predict transitive dependencies that pacman might install
- Orphan list may change after packages are installed

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@ -1,104 +1,95 @@
## 1. Project Setup
- [x] 1.1 Initialize Go module with proper imports
- [x] 1.2 Add required dependencies (dyalpm wrapper, Jguer/aur)
- [x] 1.3 Set up project structure (cmd/declpac/main.go, pkg/ subdirectory)
- [x] 1.4 Add libalpm initialization and handle
- [ ] 1.1 Initialize Go module with proper imports
- [ ] 1.2 Add required dependencies (dyalpm wrapper, Jguer/aur)
- [ ] 1.3 Set up project structure (cmd/declpac/main.go, pkg/ subdirectory)
- [ ] 1.4 Add libalpm initialization and handle
## 2. Input Parsing
- [x] 2.1 Implement stdin reader to collect package names
- [x] 2.2 Implement state file reader for text-list format
- [x] 2.3 Add whitespace normalization for package names
- [x] 2.4 Create package name set data structure
- [ ] 2.1 Implement stdin reader to collect package names
- [ ] 2.2 Implement state file reader for text-list format
- [ ] 2.3 Add whitespace normalization for package names
- [ ] 2.4 Create package name set data structure
## 3. Input Merging
- [x] 3.1 Implement additive merging of stdin and state file packages
- [x] 3.2 Handle multiple --state flags with last-writer-wins per file
- [x] 3.3 Implement duplicate package handling (no deduplication)
- [ ] 3.1 Implement additive merging of stdin and state file packages
- [ ] 3.2 Handle multiple --state flags with last-writer-wins per file
- [ ] 3.3 Implement duplicate package handling (no deduplication)
## 4. State Validation
- [x] 4.1 Implement empty state detection (no packages found)
- [x] 4.2 Add stderr error output for empty state
- [x] 4.3 Set exit code 1 for empty state case (abort, not proceed)
- [x] 4.4 Check pacman DB freshness (db.lock timestamp)
- [x] 4.5 Run pacman -Syy if DB older than 1 day
- [x] 4.6 Validate packages via libalpm (pacman repos)
- [x] 4.7 Validate packages via Jguer/aur (AUR)
- [x] 4.8 Fail fast with error if package not found
- [ ] 4.1 Implement empty state detection (no packages found)
- [ ] 4.2 Add stderr error output for empty state
- [ ] 4.3 Set exit code 1 for empty state case (abort, not proceed)
- [ ] 4.4 Check pacman DB freshness (db.lock timestamp)
- [ ] 4.5 Run pacman -Syy if DB older than 1 day
- [ ] 4.6 Validate packages via libalpm (pacman repos)
- [ ] 4.7 Validate packages via Jguer/aur (AUR)
- [ ] 4.8 Fail fast with error if package not found
## 5. Pacman Integration (Hybrid: query via libalpm, modify via exec)
- [x] 5.1 Initialize libalpm handle for queries
- [x] 5.2 Implement libalpm query for installed packages
- [x] 5.3 Implement libalpm query for available packages
- [x] 5.4 Implement pacman -Syy command execution (DB refresh)
- [x] 5.5 Implement pacman -Syu command execution wrapper
- [x] 5.6 Add command-line argument construction with package list
- [x] 5.7 Capture pacman stdout and stderr output
- [x] 5.8 Implement pacman error message parsing
- [x] 5.9 Handle pacman exit codes for success/failure detection
- [x] 5.10 Verify pacman automatically resolves transitive dependencies
- [ ] 5.1 Initialize libalpm handle for queries
- [ ] 5.2 Implement libalpm query for installed packages
- [ ] 5.3 Implement libalpm query for available packages
- [ ] 5.4 Implement pacman -Syy command execution (DB refresh)
- [ ] 5.5 Implement pacman -Syu command execution wrapper
- [ ] 5.6 Add command-line argument construction with package list
- [ ] 5.7 Capture pacman stdout and stderr output
- [ ] 5.8 Implement pacman error message parsing
- [ ] 5.9 Handle pacman exit codes for success/failure detection
- [ ] 5.10 Verify pacman automatically resolves transitive dependencies
## 6. Explicit Marking & Orphan Cleanup
- [x] 6.1 Get list of currently installed packages before sync
- [x] 6.2 Mark declared state packages as explicitly installed via pacman -D --explicit
- [x] 6.3 Run pacman sync operation (5.x series)
- [x] 6.4 Run pacman -Rsu to remove orphaned packages
- [x] 6.5 Capture and report number of packages removed
- [x] 6.6 Handle case where no orphans exist (no packages removed)
- [ ] 6.1 Get list of currently installed packages before sync
- [ ] 6.2 Mark declared state packages as explicitly installed via pacman -D --explicit
- [ ] 6.3 Run pacman sync operation (5.x series)
- [ ] 6.4 Run pacman -Rsu to remove orphaned packages
- [ ] 6.5 Capture and report number of packages removed
- [ ] 6.6 Handle case where no orphans exist (no packages removed)
## 7. AUR Integration
- [x] 7.1 Implement AUR package lookup via Jguer/aur library
- [x] 7.2 Check package not in pacman repos first (via libalpm)
- [x] 7.3 Query AUR for missing packages
- [x] 7.4 Implement AUR fallback using makepkg (direct build, not AUR helper)
- [x] 7.5 Clone AUR package git repo to temp directory
- [x] 7.6 Run makepkg -si in temp directory for installation
- [x] 7.7 Upgrade existing AUR packages to latest (makepkg rebuild)
- [x] 7.8 Add stderr error reporting for packages not in pacman or AUR
- [x] 7.9 Capture makepkg stdout and stderr for output parsing
- [x] 7.10 Handle makepkg exit codes for success/failure detection
- [ ] 7.1 Implement AUR package lookup via Jguer/aur library
- [ ] 7.2 Check package not in pacman repos first (via libalpm)
- [ ] 7.3 Query AUR for missing packages
- [ ] 7.4 Implement AUR fallback using makepkg (direct build, not AUR helper)
- [ ] 7.5 Clone AUR package git repo to temp directory
- [ ] 7.6 Run makepkg -si in temp directory for installation
- [ ] 7.7 Upgrade existing AUR packages to latest (makepkg rebuild)
- [ ] 7.8 Add stderr error reporting for packages not in pacman or AUR
- [ ] 7.9 Capture makepkg stdout and stderr for output parsing
- [ ] 7.10 Handle makepkg exit codes for success/failure detection
## 8. Output Generation
- [x] 8.1 Parse pacman output for installed package count
- [x] 8.2 Parse pacman output for removed package count (orphan cleanup)
- [x] 8.3 Generate output: `Installed X packages, removed Y packages`
- [x] 8.4 Handle 0 packages case: `Installed 0 packages, removed 0 packages`
- [x] 8.5 Print errors to stderr
- [x] 8.6 Set exit code 0 for success, 1 for errors
- [ ] 8.1 Parse pacman output for installed package count
- [ ] 8.2 Parse pacman output for removed package count (orphan cleanup)
- [ ] 8.3 Generate output: `Installed X packages, removed Y packages`
- [ ] 8.4 Handle 0 packages case: `Installed 0 packages, removed 0 packages`
- [ ] 8.5 Print errors to stderr
- [ ] 8.6 Set exit code 0 for success, 1 for errors
## 9. CLI Interface
- [x] 9.1 Implement --state flag argument parsing
- [x] 9.2 Implement stdin input handling from /dev/stdin
- [x] 9.3 Set up correct CLI usage/help message
- [x] 9.4 Implement flag order validation
- [ ] 9.1 Implement --state flag argument parsing
- [ ] 9.2 Implement stdin input handling from /dev/stdin
- [ ] 9.3 Set up correct CLI usage/help message
- [ ] 9.4 Implement flag order validation
## 10. Integration & Testing
- [x] 10.1 Wire together stdin -> state files -> merging -> validation -> pacman sync -> orphan cleanup -> output
- [x] 10.2 Test empty state error output and exit code 1
- [x] 10.3 Test single state file parsing
- [x] 10.4 Test multiple state file merging
- [x] 10.5 Test stdin input parsing
- [x] 10.6 Test explicit marking before sync
- [x] 10.7 Test pacman command execution with real packages
- [x] 10.8 Test orphan cleanup removes unneeded packages
- [x] 10.9 Test AUR fallback with makepkg for AUR package
- [x] 10.10 Test error handling for missing packages
- [x] 10.11 Generate final binary
## 11. Dry-Run Mode
- [x] 11.1 Add --dry-run flag to CLI argument parsing
- [x] 11.2 Implement DryRun function to query current state
- [x] 11.3 Compare declared packages to current installations
- [x] 11.4 Identify packages to install (not currently installed)
- [x] 11.5 Identify orphans to remove via pacman -Qdtq
- [x] 11.6 Output "Would install:" and "Would remove:" sections
- [ ] 10.1 Wire together stdin -> state files -> merging -> validation -> pacman sync -> orphan cleanup -> output
- [ ] 10.2 Test empty state error output and exit code 1
- [ ] 10.3 Test single state file parsing
- [ ] 10.4 Test multiple state file merging
- [ ] 10.5 Test stdin input parsing
- [ ] 10.6 Test explicit marking before sync
- [ ] 10.7 Test pacman command execution with real packages
- [ ] 10.8 Test orphan cleanup removes unneeded packages
- [ ] 10.9 Test AUR fallback with makepkg for AUR package
- [ ] 10.10 Test error handling for missing packages
- [ ] 10.11 Generate final binary

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schema: spec-driven
created: 2026-04-13

67
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## Context
Current implementation in `pkg/pacman/pacman.go` spawns shell processes for pacman queries:
1. **`ValidatePackage`**: Calls `pacman -Qip` then `pacman -Sip` (2 processes per package) to check if package exists in sync databases
2. **`MarkExplicit`**: Calls `pacman -D --explicit <pkg>` individually per package (N processes for N packages)
3. **AUR**: Called individually per package not found in pacman databases
Performance issues scale with package count. No caching of package queries across calls.
## Goals / Non-Goals
**Goals:**
- Use Jguer/dyalpm library to query pacman databases without spawning processes
- Add in-memory cache for ALL package query results (pacman + AUR), valid for entire job duration
- Batch `pacman -D --explicit` calls to single process for multiple packages
- Batch AUR HTTP queries to single request for all packages not found in pacman
**Non-Goals:**
- Refactor AUR handling (already uses HTTP API - will batch it)
- Add persistent cache (only job-duration in-memory)
- Change other pacman operations (sync, cleanup)
## Decisions
1. **dyalpm over go-alpm**: dyalpm uses purego (no cgo), cleaner cross-compilation
- Alternative: go-alpm (cgo-based) - rejected for compilation complexity
2. **Unified cache in Pac struct**: Single cache map replaces separate aurCache
- Alternative: keep separate caches - rejected, unnecessary complexity
- Cache key: package name, value: PackageInfo struct
3. **Batch MarkExplicit**: Accept `[]string` packages, pass all to single `pacman -D --explicit` call
- Note: pacman -D accepts multiple packages in single call
4. **Batch query strategy**:
- Query all packages against dyalpm local DB → returns found[]
- Query not-found against dyalpm sync DBs → returns found[]
- Query remaining not-found against AUR HTTP (single batched request)
- Current: pacman -Qip → pacman -Sip → AUR (per-package)
- New: Batch dyalpm local → Batch dyalpm sync → Batch AUR
5. **Fallback for dyalpm unavailable**: If dyalpm init fails, fall back to:
- pacman -Qip for all packages (single process, capture all)
- pacman -Sip for remaining (single process, capture all)
- AUR HTTP batch for remaining (already batched)
## Risks / Trade-offs
- **Risk**: dyalpm requires libalpm.so.15 on system
- Mitigation: Check at runtime, fallback to process spawn if missing
- **Risk**: Cache invalidation edge cases (e.g., package installed during job)
- Mitigation: Acceptable for declpac use case; user runs sync after config changes
- **Risk**: AUR API batch size limits
- Mitigation: Chunk large batches if AUR has limits (TBD in implementation)
## Migration Plan
1. Add dyalpm dependency to go.mod
2. Refactor Pac struct: replace aurCache with unified pkgCache map
3. Change ValidatePackage to ValidatePackages (slice input, batch processing)
4. Update MarkExplicit to accept slice
5. Batch AUR HTTP calls in ensureAURCache
6. Update call sites in Sync(), categorizePackages, DryRun()
7. Test with existing test suite

28
openspec/changes/use-dyalpm-and-batch-explicit/proposal.md
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## Why
Current `ValidatePackage` spawns multiple `pacman` processes per package (-Qip, -Sip calls), causing performance issues when checking many packages. Additionally, `MarkExplicit` is called individually for each package, spawning a separate process per package. Finally, AUR HTTP calls are made per-package. Using the Jguer/dyalpm Go library eliminates process spawning overhead and enables efficient batch operations throughout.
## What Changes
- Replace shell-out to `pacman -Qip`/`pacman -Sip` in `ValidatePackage` with Jguer/dyalpm library calls
- Add unified in-memory package cache to `Pac` struct (replaces existing aurCache), persisting for job duration
- Replace individual `pacman -D --explicit` calls with single batch call
- Batch AUR HTTP queries into single request for all packages not found in pacman databases
- Add Jguer/dyalpm dependency
## Capabilities
### New Capabilities
- **dyalpm-package-query**: Use dyalpm library for querying pacman package databases in batch, falling back to AUR HTTP batch for remaining packages. Results cached for job duration.
- **batch-explicit-mark**: Batch multiple packages into single `pacman -D --explicit` call instead of per-package process spawn.
### Modified Capabilities
None.
## Impact
- **pkg/pacman/pacman.go**: Refactor `ValidatePackage` to accept slice, replace aurCache with unified pkgCache, refactor `MarkExplicit` to accept slice
- **go.mod**: Add Jguer/dyalpm import
- **Performance**: Reduced process spawns from O(n*2 + n AUR) to O(1) for ValidatePackages, O(n) to O(1) for MarkExplicit

16
openspec/changes/use-dyalpm-and-batch-explicit/specs/batch-explicit-mark/spec.md
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## ADDED Requirements
### Requirement: MarkExplicit accepts multiple packages
The MarkExplicit method SHALL accept a slice of package names and mark all of them as explicitly installed using a single pacman -D call.
#### Scenario: Single package marked explicit
- **WHEN** MarkExplicit is called with one package name
- **THEN** pacman -D --explicit is called once with that package
#### Scenario: Multiple packages marked explicit
- **WHEN** MarkExplicit is called with multiple package names (e.g., ["pkg1", "pkg2"])
- **THEN** pacman -D --explicit is called once with all packages as arguments
#### Scenario: Empty package slice
- **WHEN** MarkExplicit is called with an empty slice
- **THEN** no pacman call is made, method returns nil immediately

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openspec/changes/use-dyalpm-and-batch-explicit/specs/dyalpm-package-query/spec.md
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## ADDED Requirements
### Requirement: ValidatePackages uses dyalpm library with batch AUR fallback
The ValidatePackages method SHALL accept a slice of package names, query them in batch using dyalpm, then batch query AUR for any not found in pacman databases.
#### Scenario: All packages found in local database
- **WHEN** ValidatePackages is called with packages that all exist in local pacman database
- **THEN** returns a slice of PackageInfo with Exists=true, InAUR=false for each
#### Scenario: Some packages found in sync database
- **WHEN** ValidatePackages is called with packages where some are only in sync databases
- **THEN** returns PackageInfo with Exists=true, InAUR=false for found packages
#### Scenario: Some packages found in AUR
- **WHEN** ValidatePackages is called and some packages are not in pacman databases
- **THEN** those packages are batched to single AUR HTTP request, returns PackageInfo with InAUR=true
#### Scenario: Packages not found anywhere
- **WHEN** ValidatePackages is called and some packages not found in pacman or AUR
- **THEN** returns PackageInfo with Exists=false, InAUR=false for those packages
### Requirement: Unified package cache
The Pac struct SHALL maintain a single cache map that stores all package query results (both pacman and AUR), replacing the separate aurCache.
#### Scenario: Package already cached
- **WHEN** ValidatePackages is called for a package already queried in current job
- **THEN** cached result returned without any dyalpm or AUR calls
#### Scenario: New Pac instance
- **WHEN** New() creates a new Pac instance
- **THEN** cache is empty (fresh job)
### Requirement: Single batch AUR call
The AUR HTTP API SHALL be called once with all package names not found in pacman databases.
#### Scenario: Multiple packages not in pacman
- **WHEN** 3 packages not found in local or sync databases
- **THEN** single AUR HTTP request with all 3 in arg[] params
- **AND** results cached for all 3
### Requirement: Fallback to process spawn if dyalpm unavailable
If dyalpm library is not available at runtime, ValidatePackages SHALL fall back to spawning pacman -Qip/-Sip processes in batch.
#### Scenario: dyalpm unavailable
- **WHEN** dyalpm initialization fails
- **THEN** uses pacman -Qip for local, -Sip for sync, AUR HTTP batch as fallback
- **AND** behavior is identical to using dyalpm

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openspec/changes/use-dyalpm-and-batch-explicit/tasks.md
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## 1. Dependencies
- [ ] 1.1 Add github.com/Jguer/dyalpm to go.mod
- [ ] 1.2 Run go mod tidy to resolve dependencies
## 2. Pac Struct Updates
- [ ] 2.1 Add dyalpm handle field to Pac struct
- [ ] 2.2 Add package info cache field (map[string]PackageInfo) to Pac struct
- [ ] 2.3 Update New() to initialize dyalpm handle
- [ ] 2.4 Update Close() to release dyalpm handle
## 3. ValidatePackage Implementation
- [ ] 3.1 Implement ValidatePackage using dyalpm LocalDB().Pkg()
- [ ] 3.2 Query sync databases if not found locally
- [ ] 3.3 Add caching logic to store/query results
- [ ] 3.4 Keep AUR fallback for packages not in pacman repos
## 4. MarkExplicit Updates
- [ ] 4.1 Change MarkExplicit signature to accept []string (slice of packages)
- [ ] 4.2 Implement single pacman -D --explicit call with all packages
- [ ] 4.3 Handle empty slice case (return nil immediately)
## 5. Call Site Updates
- [ ] 5.1 Update Sync() to pass packages slice to MarkExplicit
- [ ] 5.2 Ensure categorizePackages works with new ValidatePackage
## 6. Testing
- [ ] 6.1 Run existing tests to verify no regressions
- [ ] 6.2 Test ValidatePackage with local, sync, and AUR packages
- [ ] 6.3 Test MarkExplicit with single and multiple packages
- [ ] 6.4 Verify cache behavior (second call returns cached result)

66
pkg/input/input.go
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package input
import (
"bufio"
"os"
"strings"
)
func ReadPackages(stateFiles []string) (map[string]bool, error) {
packages := make(map[string]bool)
for _, file := range stateFiles {
if err := readStateFile(file, packages); err != nil {
return nil, err
}
}
if err := readStdin(packages); err != nil {
return nil, err
}
return packages, nil
}
func readStateFile(path string, packages map[string]bool) error {
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
name := normalizePackageName(scanner.Text())
if name != "" {
packages[name] = true
}
}
return scanner.Err()
}
func readStdin(packages map[string]bool) error {
info, err := os.Stdin.Stat()
if err != nil {
return err
}
if (info.Mode() & os.ModeCharDevice) != 0 {
return nil
}
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
name := normalizePackageName(scanner.Text())
if name != "" {
packages[name] = true
}
}
return scanner.Err()
}
func normalizePackageName(name string) string {
return strings.TrimSpace(name)
}

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pkg/merge/merge.go
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package merge
func Merge(packages map[string]bool) []string {
result := make([]string, 0, len(packages))
for name := range packages {
result = append(result, name)
}
return result
}

27
pkg/output/output.go
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package output
import (
"fmt"
"strings"
)
type Result struct {
Installed int
Removed int
ToInstall []string
ToRemove []string
}
func Format(r *Result) string {
var b strings.Builder
b.WriteString(fmt.Sprintf("Installed %d packages, removed %d packages", r.Installed, r.Removed))
if len(r.ToInstall) > 0 {
b.WriteString("\nWould install: ")
b.WriteString(strings.Join(r.ToInstall, ", "))
}
if len(r.ToRemove) > 0 {
b.WriteString("\nWould remove: ")
b.WriteString(strings.Join(r.ToRemove, ", "))
}
return b.String()
}

380
pkg/pacman/pacman.go
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package pacman
import (
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"os"
"os/exec"
"regexp"
"strings"
"time"
"github.com/Riyyi/declpac/pkg/output"
)
var (
Root = "/"
LockFile = "/var/lib/pacman/db.lock"
AURInfoURL = "https://aur.archlinux.org/rpc?v=5&type=info"
)
type Pac struct {
aurCache map[string]AURPackage
}
func New() (*Pac, error) {
return &Pac{aurCache: make(map[string]AURPackage)}, nil
}
func (p *Pac) Close() error {
return nil
}
type PackageInfo struct {
Name string
InAUR bool
Exists bool
AURInfo *AURPackage
}
type AURResponse struct {
Results []AURPackage `json:"results"`
}
type AURPackage struct {
Name string `json:"Name"`
PackageBase string `json:"PackageBase"`
Version string `json:"Version"`
URL string `json:"URL"`
}
func (p *Pac) ValidatePackage(name string) (*PackageInfo, error) {
cmd := exec.Command("pacman", "-Qip", name)
if err := cmd.Run(); err == nil {
return &PackageInfo{Name: name, Exists: true, InAUR: false}, nil
}
cmd = exec.Command("pacman", "-Sip", name)
if err := cmd.Run(); err == nil {
return &PackageInfo{Name: name, Exists: true, InAUR: false}, nil
}
p.ensureAURCache([]string{name})
if aurInfo, ok := p.aurCache[name]; ok {
return &PackageInfo{Name: name, Exists: true, InAUR: true, AURInfo: &aurInfo}, nil
}
return &PackageInfo{Name: name, Exists: false, InAUR: false}, nil
}
func (p *Pac) IsDBFresh() (bool, error) {
info, err := os.Stat(LockFile)
if err != nil {
return false, nil
}
age := time.Since(info.ModTime())
return age < 24*time.Hour, nil
}
func (p *Pac) SyncDB() error {
cmd := exec.Command("pacman", "-Syy")
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
func (p *Pac) GetInstalledPackages() ([]string, error) {
cmd := exec.Command("pacman", "-Qq")
output, err := cmd.Output()
if err != nil {
return nil, err
}
packages := strings.Split(strings.TrimSpace(string(output)), "\n")
return packages, nil
}
func (p *Pac) MarkExplicit(pkgName string) error {
cmd := exec.Command("pacman", "-D", "--explicit", pkgName)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
func Sync(packages []string) (*output.Result, error) {
before, err := getInstalledCount()
if err != nil {
return nil, err
}
p, err := New()
if err != nil {
return nil, err
}
defer p.Close()
fresh, err := p.IsDBFresh()
if err != nil || !fresh {
if err := p.SyncDB(); err != nil {
return nil, fmt.Errorf("failed to sync database: %w", err)
}
}
pacmanPkgs, aurPkgs := p.categorizePackages(packages)
for _, pkg := range packages {
if err := p.MarkExplicit(pkg); err != nil {
fmt.Fprintf(os.Stderr, "warning: could not mark %s as explicit: %v\n", pkg, err)
}
}
if len(pacmanPkgs) > 0 {
_, err = p.SyncPackages(pacmanPkgs)
if err != nil {
return nil, err
}
}
for _, pkg := range aurPkgs {
if err := p.InstallAUR(pkg); err != nil {
return nil, err
}
}
removed, err := p.CleanupOrphans()
if err != nil {
return nil, err
}
after, _ := getInstalledCount()
installedCount := max(after-before, 0)
return &output.Result{
Installed: installedCount,
Removed: removed,
}, nil
}
func (p *Pac) categorizePackages(packages []string) (pacmanPkgs, aurPkgs []string) {
var notInPacman []string
for _, pkg := range packages {
info, err := p.ValidatePackage(pkg)
if err != nil || !info.Exists {
notInPacman = append(notInPacman, pkg)
} else if !info.InAUR {
pacmanPkgs = append(pacmanPkgs, pkg)
}
}
if len(notInPacman) > 0 {
p.ensureAURCache(notInPacman)
for _, pkg := range notInPacman {
if _, ok := p.aurCache[pkg]; ok {
aurPkgs = append(aurPkgs, pkg)
} else {
fmt.Fprintf(os.Stderr, "error: package not found: %s\n", pkg)
}
}
}
return pacmanPkgs, aurPkgs
}
func (p *Pac) ensureAURCache(packages []string) {
if len(packages) == 0 {
return
}
var uncached []string
for _, pkg := range packages {
if _, ok := p.aurCache[pkg]; !ok {
uncached = append(uncached, pkg)
}
}
if len(uncached) == 0 {
return
}
p.fetchAURInfo(uncached)
}
func (p *Pac) fetchAURInfo(packages []string) map[string]AURPackage {
result := make(map[string]AURPackage)
if len(packages) == 0 {
return result
}
v := url.Values{}
for _, pkg := range packages {
v.Add("arg[]", pkg)
}
resp, err := http.Get(AURInfoURL + "&" + v.Encode())
if err != nil {
return result
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return result
}
var aurResp AURResponse
if err := json.Unmarshal(body, &aurResp); err != nil {
return result
}
for _, r := range aurResp.Results {
p.aurCache[r.Name] = r
result[r.Name] = r
}
return result
}
func (p *Pac) InstallAUR(pkgName string) error {
aurInfo, ok := p.aurCache[pkgName]
if !ok {
return fmt.Errorf("AUR package not found in cache: %s", pkgName)
}
tmpDir, err := os.MkdirTemp("", "declpac-aur-")
if err != nil {
return fmt.Errorf("failed to create temp directory: %w", err)
}
defer os.RemoveAll(tmpDir)
cloneURL := "https://aur.archlinux.org/" + aurInfo.PackageBase + ".git"
cloneCmd := exec.Command("git", "clone", cloneURL, tmpDir)
cloneCmd.Stdout = os.Stdout
cloneCmd.Stderr = os.Stderr
if err := cloneCmd.Run(); err != nil {
return fmt.Errorf("failed to clone AUR repo: %w", err)
}
makepkgCmd := exec.Command("makepkg", "-si", "--noconfirm")
makepkgCmd.Stdout = os.Stdout
makepkgCmd.Stderr = os.Stderr
makepkgCmd.Dir = tmpDir
if err := makepkgCmd.Run(); err != nil {
return fmt.Errorf("makepkg failed to build AUR package: %w", err)
}
return nil
}
func getInstalledCount() (int, error) {
cmd := exec.Command("pacman", "-Qq")
output, err := cmd.Output()
if err != nil {
return 0, nil
}
count := strings.Count(string(output), "\n") + 1
if strings.TrimSpace(string(output)) == "" {
count = 0
}
return count, nil
}
func (p *Pac) SyncPackages(packages []string) (int, error) {
args := append([]string{"-Syu"}, packages...)
cmd := exec.Command("pacman", args...)
output, err := cmd.CombinedOutput()
if err != nil {
return 0, fmt.Errorf("pacman sync failed: %s", output)
}
re := regexp.MustCompile(`upgrading (\S+)`)
matches := re.FindAllStringSubmatch(string(output), -1)
return len(matches), nil
}
func (p *Pac) CleanupOrphans() (int, error) {
listCmd := exec.Command("pacman", "-Qdtq")
orphans, err := listCmd.Output()
if err != nil {
return 0, nil
}
orphanList := strings.TrimSpace(string(orphans))
if orphanList == "" {
return 0, nil
}
removeCmd := exec.Command("pacman", "-Rns")
output, err := removeCmd.CombinedOutput()
if err != nil {
return 0, fmt.Errorf("%s: %s", err, output)
}
count := strings.Count(orphanList, "\n") + 1
return count, nil
}
func DryRun(packages []string) (*output.Result, error) {
p, err := New()
if err != nil {
return nil, err
}
defer p.Close()
current, err := p.GetInstalledPackages()
if err != nil {
return nil, err
}
currentSet := make(map[string]bool)
for _, pkg := range current {
currentSet[pkg] = true
}
var toInstall []string
var aurPkgs []string
for _, pkg := range packages {
if !currentSet[pkg] {
info, err := p.ValidatePackage(pkg)
if err != nil || !info.Exists {
return nil, fmt.Errorf("package not found: %s", pkg)
}
if info.InAUR {
aurPkgs = append(aurPkgs, pkg)
} else {
toInstall = append(toInstall, pkg)
}
}
}
orphans, err := p.listOrphans()
if err != nil {
return nil, err
}
return &output.Result{
Installed: len(toInstall) + len(aurPkgs),
Removed: len(orphans),
ToInstall: append(toInstall, aurPkgs...),
ToRemove: orphans,
}, nil
}
func (p *Pac) listOrphans() ([]string, error) {
cmd := exec.Command("pacman", "-Qdtq")
orphans, err := cmd.Output()
if err != nil {
return nil, nil
}
list := strings.TrimSpace(string(orphans))
if list == "" {
return nil, nil
}
return strings.Split(list, "\n"), nil
}

134
pkg/validation/validation.go
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package validation
import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"os"
"os/exec"
"time"
)
var LockFile = "/var/lib/pacman/db.lock"
const AURInfoURL = "https://aur.archlinux.org/rpc?v=5&type=info"
type AURResponse struct {
Results []AURResult `json:"results"`
}
type AURResult struct {
Name string `json:"Name"`
}
func Validate(packages []string) error {
if len(packages) == 0 {
return errors.New("no packages found")
}
if err := checkDBFreshness(); err != nil {
return err
}
if err := validatePackages(packages); err != nil {
return err
}
return nil
}
func checkDBFreshness() error {
info, err := os.Stat(LockFile)
if err != nil {
return nil
}
age := time.Since(info.ModTime())
if age > 24*time.Hour {
cmd := exec.Command("pacman", "-Syy")
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
return fmt.Errorf("failed to refresh pacman database: %w", err)
}
}
return nil
}
func validatePackages(packages []string) error {
var pacmanPkgs []string
var aurPkgs []string
for _, pkg := range packages {
if inPacman(pkg) {
pacmanPkgs = append(pacmanPkgs, pkg)
} else {
aurPkgs = append(aurPkgs, pkg)
}
}
if len(aurPkgs) > 0 {
foundAUR := batchSearchAUR(aurPkgs)
for _, pkg := range aurPkgs {
if !foundAUR[pkg] {
return fmt.Errorf("package not found: %s", pkg)
}
}
}
return nil
}
func inPacman(name string) bool {
cmd := exec.Command("pacman", "-Qip", name)
if err := cmd.Run(); err == nil {
return true
}
cmd = exec.Command("pacman", "-Sip", name)
if err := cmd.Run(); err == nil {
return true
}
return false
}
func batchSearchAUR(packages []string) map[string]bool {
result := make(map[string]bool)
if len(packages) == 0 {
return result
}
v := url.Values{}
v.Set("type", "info")
for _, pkg := range packages {
v.Add("arg[]", pkg)
}
resp, err := http.Get(AURInfoURL + "&" + v.Encode())
if err != nil {
return result
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return result
}
var aurResp AURResponse
if err := json.Unmarshal(body, &aurResp); err != nil {
return result
}
for _, r := range aurResp.Results {
result[r.Name] = true
}
return result
}
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