Add setup check script

Author: emilbayes

bin/check.js

@@ -0,0 +1,73 @@
+const fs = require('fs')
+
+const hyperfuse = require('hyperdrive-fuse')
+const chalk = require('chalk')
+const { exec } = require('child_process')
+
+exports.command = 'check'
+exports.desc = 'Check configuration of FUSE and hyperdrive mount point.'
+exports.builder = {
+  user: {
+    description: 'User that should own the /hyperdrive directory',
+    type: 'string',
+    default: process.geteuid(),
+    alias: 'U'
+  },
+  group: {
+    description: 'User that should own the /hyperdrive directory',
+    type: 'string',
+    default: process.getgid(),
+    alias: 'G'
+  }
+}
+exports.handler = async function (argv) {
+  console.log(chalk.blue('Configuring FUSE...'))
+
+  configureFuse((err, fuseMsg) => {
+    if (err) return onerror(err)
+    return makeRootDrive((err, driveMsg) => {
+      if (err) return onerror(err)
+      return onsuccess([fuseMsg, driveMsg])
+    })
+  })
+
+  function configureFuse (cb) {
+    hyperfuse.isConfigured((err, fuseConfigured) => {
+      if (err) return onerror(err)
+      return cb(null, 'FUSE is configured correctly')
+    })
+  }
+
+  function makeRootDrive (cb) {
+    fs.stat('/hyperdrive', (err, stat) => {
+      if (err && err.errno !== -2) return cb(new Error('Could not get the status of /hyperdrive.'))
+      if (!err && !stat) return cb(null, false)
+
+      exec(`id -G ${argv.user}`, (err, stdout) => {
+        if (err) return cb(new Error(`Could not resolve groups: ${err}`))
+        const userGroups = stdout.trim().split(' ')
+        if (userGroups.includes(stat.gid) === false) return cb(new Error('/hyperdrive is not part of any groups the user is part of'))
+
+        exec(`id -u ${argv.user}`, (err, stdout) => {
+          if (err) return cb(new Error(`Could not resolve user: ${err}`))
+          if (stdout.trim() === stat.uid) return cb(new Error(`/hyperdrive is not owned by user: ${argv.user}`))
+
+          return cb(null, '/hyperdrive is configured correctly')
+        })
+      })
+    })
+  }
+
+  function onsuccess (msgs) {
+    console.log(chalk.green('Successfully checked FUSE:'))
+    console.log()
+    for (const msg of msgs) {
+      console.log(chalk.green(`  * ${msg}`))
+    }
+  }
+
+  function onerror (err) {
+    console.error(chalk.red(`Could not check FUSE.`))
+    if (err) console.error(chalk.red(err))
+  }
+}