Multi-Instance Daemon Support

Spacedrive CLI now supports running multiple daemon instances simultaneously, enabling local testing of device pairing and other multi-device features.

Overview

Multiple daemon instances allow you to:

Test device pairing locally by running two instances
Simulate multi-device scenarios on a single machine
Isolate different development/testing environments
Run production and development daemons side-by-side

Usage

Starting Multiple Instances

bash

# Start default instance
spacedrive start

# Start named instances
spacedrive start --instance alice
spacedrive start --instance bob

# Start with networking enabled
spacedrive start --instance alice
spacedrive start --instance bob

Targeting Specific Instances

Use the --instance flag to target commands to specific daemon instances:

bash

# Default instance
spacedrive library list

# Named instances
spacedrive --instance alice library list
spacedrive --instance bob library create "Bob's Library"

Instance Management

bash

# List all daemon instances
spacedrive instance list

# Stop specific instance
spacedrive instance stop alice
spacedrive --instance bob stop  # Alternative syntax

# Check status of specific instance
spacedrive --instance alice daemon

Auto-Start Configuration

On macOS, you can configure instances to start automatically on login:

bash

# Install auto-start for default instance
spacedrive daemon install

# Install auto-start for named instance
spacedrive --instance alice daemon install

# Check auto-start status
spacedrive --instance alice daemon status

# Remove auto-start
spacedrive --instance alice daemon uninstall

Each instance gets its own LaunchAgent plist file. The daemon starts with the correct --data-dir and --instance flags automatically. Logs write to ~/Library/Application Support/spacedrive/logs/daemon.out.log and daemon.err.log.

Device Pairing Example

Test device pairing locally using two instances:

bash

# Terminal 1: Start Alice's daemon
spacedrive start --instance alice --foreground

# Terminal 2: Start Bob's daemon
spacedrive start --instance bob --foreground

# Terminal 3: Alice generates pairing code
spacedrive --instance alice network init --password "test123"
spacedrive --instance alice network pair generate --auto-accept

# Terminal 4: Bob joins using Alice's code
spacedrive --instance bob network init --password "test123"
spacedrive --instance bob network pair join "word1 word2 word3 ... word12"

Architecture

Instance Isolation

Each instance has completely isolated:

Socket paths: spacedrive.sock, spacedrive-alice.sock, spacedrive-bob.sock
PID files: spacedrive.pid, spacedrive-alice.pid, spacedrive-bob.pid
Data directories: data/sd-cli-data/, data/sd-cli-data/instance-alice/
CLI state: Separate cli_state.json per instance

File Structure

$runtime_dir/               # /tmp or $XDG_RUNTIME_DIR
├── spacedrive.sock         # Default instance socket
├── spacedrive.pid          # Default instance PID
├── spacedrive-alice.sock   # Alice instance socket
├── spacedrive-alice.pid    # Alice instance PID
├── spacedrive-bob.sock     # Bob instance socket
└── spacedrive-bob.pid      # Bob instance PID

data/sd-cli-data/                    # Default instance data
├── spacedrive.json
├── libraries/
└── cli_state.json

data/sd-cli-data/instance-alice/     # Alice instance data
├── spacedrive.json
├── libraries/
└── cli_state.json

data/sd-cli-data/instance-bob/       # Bob instance data
├── spacedrive.json
├── libraries/
└── cli_state.json

Development Workflow

Testing Pairing Protocol

bash

# Start two instances for pairing test
spacedrive start --instance initiator --foreground &
spacedrive start --instance joiner --foreground &

# Initialize networking
spacedrive --instance initiator network init --password "dev123"
spacedrive --instance joiner network init --password "dev123"

# Test pairing
CODE=$(spacedrive --instance initiator network pair generate --auto-accept | grep "Pairing code:" | cut -d' ' -f3-)
spacedrive --instance joiner network pair join "$CODE"

# Verify connection
spacedrive --instance initiator network devices
spacedrive --instance joiner network devices

Instance Cleanup

bash

# Stop all instances
spacedrive instance list
spacedrive instance stop alice
spacedrive instance stop bob
spacedrive stop  # Default instance

# Clean up sockets (if needed)
rm /tmp/spacedrive*.sock /tmp/spacedrive*.pid

Backwards Compatibility

The implementation maintains full backwards compatibility:

All existing commands work unchanged with the default instance
No breaking changes to CLI interface
Default instance behavior is identical to single-instance mode

Implementation Notes

Instance names must be valid filenames (no special characters)
Socket discovery happens automatically via filesystem scanning
Daemon startup checks for instance conflicts
Each instance runs independently with separate process trees