Troubleshooting

Common issues and solutions when using nxv.

Search Issues

No results found

1. Check spelling: Exact matches (--exact) are case-sensitive

   nxv search Python --exact  # Wrong
   nxv search python --exact  # Correct

2. Try partial match: Use prefix search

   nxv search pyth

3. Search descriptions: The package might have a different name

   nxv search "image editor" --desc

4. Sync index: Your index might be outdated

   nxv sync

Search is slow

The first search loads the bloom filter and warms the database cache. Subsequent searches are fast. If searches remain slow:

1. Check disk I/O (SSD recommended)
2. Check NXV_DB_PATH isn't on a network drive

Sync Issues

Download fails

1. Check network: Ensure GitHub is accessible
2. Retry: Transient failures are common

   nxv sync

3. Force full download: Skip delta updates

   nxv sync --force

Signature verification failed

1. Check clock: Signature validation requires accurate time
2. Skip verification (not recommended for production):

   NXV_SKIP_VERIFY=1 nxv sync

Incompatible index

Incompatible index: index requires schema version N but this build only supports up to M

This means your nxv application is too old for the published index. nxv sync stops without modifying either the existing index or the application.

• Local installs (install.sh, manual download): run nxv update to replace the binary after SHA-256 verification, then re-run nxv sync.
• Managed installs (Nix, cargo, Homebrew): the matching upgrade command is printed by nxv update; run it, then re-run nxv sync.

Disk full

The compressed index download is ~220MB and unpacks to ~2.1GB of disk space:

• Linux: ~/.local/share/nxv/
• macOS: ~/Library/Application Support/nxv/

Server Issues

Port already in use

# Use different port
nxv serve --port 3000

# Find what's using port 8080
lsof -i :8080

CORS errors in browser

# Enable CORS for all origins
nxv serve --cors

# Or specific origins
nxv serve --cors-origins "http://localhost:3000"

Connection refused

1. Check bind address: Default is localhost only

   nxv serve --host 0.0.0.0  # Listen on all interfaces

2. Check firewall: Ensure port is open

Indexer Issues

The indexer ingests channel-release snapshots from releases.nixos.org — it does not need a nixpkgs checkout.

Failed releases

A release that fails to download or parse is retried automatically with exponential backoff; after repeated failures it is parked as failed in the ledger. To force a retry of parked releases:

nxv index --retry-failed

Indexing stuck

1. Check logs:

   nxv -v index

2. Resume: Interrupted runs resume automatically — ingestion is tracked per release, so the next run picks up any remaining pending releases.

3. Narrow the range: Limit a run to a date window while debugging:

   nxv index --since 2024-01-01 --until 2024-02-01

Disk full during indexing

Snapshots are streamed during parsing and never written to disk. Only --backfill-evals and --head-eval evaluate with Nix, which grows the Nix store:

# Manual cleanup
nix-collect-garbage -d

Getting Help

1. Check GitHub Issues: github.com/utensils/nxv/issues
2. Open an issue: Include:
   • nxv version (nxv --version)
   • Operating system
   • Command that failed
   • Error message
   • Debug logs if available