Low disk space limit setting

[unsystemizer]

I ran out of disk space while building index, which partially corrupted my Bitcoin data.

It'd be nice if indexd had a "low disk space" setting so that we could have it auto-shutdown before it gets a chance to do damage.

[dcousens]

I suppose we should have a canonical method for that, though I've never run into the issue of it causing corruption??? Maybe this is a bitcoind bug, if the data was lost there?

leveldb is atomic enough that you shouldn't have corruption there.

[unsystemizer]

indexd kept adding data and disk was full before other apps and OS could flush their pending writes, so if it only stopped before X percent or GB were gone that would do it independently of what other apps do. Maybe other apps would still fill up the disk, but we can’t change what other apps do.

It seems diskspace is a popular module for this. https://gist.github.com/jonmaim/eff4f6308c55c48ed97c83e390504625

[dcousens]

For reference

var disk = require('diskusage')

// ...

disk.check('/', (err, info) => {
  if (err) return ...
  if (info.available / info.total < 0.99) return ...

  // ... fail, 1% disk space remaining
}

[dcousens]

See https://github.com/bitcoinjs/private-bitcoin/issues/1 instead