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node_modules/cacache/lib/content/path.js

@@ -0,0 +1,29 @@
+'use strict'
+
+const contentVer = require('../../package.json')['cache-version'].content
+const hashToSegments = require('../util/hash-to-segments')
+const path = require('path')
+const ssri = require('ssri')
+
+// Current format of content file path:
+//
+// sha512-BaSE64Hex= ->
+// ~/.my-cache/content-v2/sha512/ba/da/55deadbeefc0ffee
+//
+module.exports = contentPath
+
+function contentPath (cache, integrity) {
+  const sri = ssri.parse(integrity, { single: true })
+  // contentPath is the *strongest* algo given
+  return path.join(
+    contentDir(cache),
+    sri.algorithm,
+    ...hashToSegments(sri.hexDigest())
+  )
+}
+
+module.exports.contentDir = contentDir
+
+function contentDir (cache) {
+  return path.join(cache, `content-v${contentVer}`)
+}

node_modules/cacache/lib/content/read.js

@@ -0,0 +1,241 @@
+'use strict'
+
+const fs = require('@npmcli/fs')
+const fsm = require('fs-minipass')
+const ssri = require('ssri')
+const contentPath = require('./path')
+const Pipeline = require('minipass-pipeline')
+
+module.exports = read
+
+const MAX_SINGLE_READ_SIZE = 64 * 1024 * 1024
+async function read (cache, integrity, opts = {}) {
+  const { size } = opts
+  const { stat, cpath, sri } = await withContentSri(cache, integrity, async (cpath, sri) => {
+    // get size
+    const stat = await fs.stat(cpath)
+    return { stat, cpath, sri }
+  })
+  if (typeof size === 'number' && stat.size !== size) {
+    throw sizeError(size, stat.size)
+  }
+
+  if (stat.size > MAX_SINGLE_READ_SIZE) {
+    return readPipeline(cpath, stat.size, sri, new Pipeline()).concat()
+  }
+
+  const data = await fs.readFile(cpath, { encoding: null })
+  if (!ssri.checkData(data, sri)) {
+    throw integrityError(sri, cpath)
+  }
+
+  return data
+}
+
+const readPipeline = (cpath, size, sri, stream) => {
+  stream.push(
+    new fsm.ReadStream(cpath, {
+      size,
+      readSize: MAX_SINGLE_READ_SIZE,
+    }),
+    ssri.integrityStream({
+      integrity: sri,
+      size,
+    })
+  )
+  return stream
+}
+
+module.exports.sync = readSync
+
+function readSync (cache, integrity, opts = {}) {
+  const { size } = opts
+  return withContentSriSync(cache, integrity, (cpath, sri) => {
+    const data = fs.readFileSync(cpath, { encoding: null })
+    if (typeof size === 'number' && size !== data.length) {
+      throw sizeError(size, data.length)
+    }
+
+    if (ssri.checkData(data, sri)) {
+      return data
+    }
+
+    throw integrityError(sri, cpath)
+  })
+}
+
+module.exports.stream = readStream
+module.exports.readStream = readStream
+
+function readStream (cache, integrity, opts = {}) {
+  const { size } = opts
+  const stream = new Pipeline()
+  // Set all this up to run on the stream and then just return the stream
+  Promise.resolve().then(async () => {
+    const { stat, cpath, sri } = await withContentSri(cache, integrity, async (cpath, sri) => {
+      // just stat to ensure it exists
+      const stat = await fs.stat(cpath)
+      return { stat, cpath, sri }
+    })
+    if (typeof size === 'number' && size !== stat.size) {
+      return stream.emit('error', sizeError(size, stat.size))
+    }
+
+    return readPipeline(cpath, stat.size, sri, stream)
+  }).catch(err => stream.emit('error', err))
+
+  return stream
+}
+
+module.exports.copy = copy
+module.exports.copy.sync = copySync
+
+function copy (cache, integrity, dest) {
+  return withContentSri(cache, integrity, (cpath, sri) => {
+    return fs.copyFile(cpath, dest)
+  })
+}
+
+function copySync (cache, integrity, dest) {
+  return withContentSriSync(cache, integrity, (cpath, sri) => {
+    return fs.copyFileSync(cpath, dest)
+  })
+}
+
+module.exports.hasContent = hasContent
+
+async function hasContent (cache, integrity) {
+  if (!integrity) {
+    return false
+  }
+
+  try {
+    return await withContentSri(cache, integrity, async (cpath, sri) => {
+      const stat = await fs.stat(cpath)
+      return { size: stat.size, sri, stat }
+    })
+  } catch (err) {
+    if (err.code === 'ENOENT') {
+      return false
+    }
+
+    if (err.code === 'EPERM') {
+      /* istanbul ignore else */
+      if (process.platform !== 'win32') {
+        throw err
+      } else {
+        return false
+      }
+    }
+  }
+}
+
+module.exports.hasContent.sync = hasContentSync
+
+function hasContentSync (cache, integrity) {
+  if (!integrity) {
+    return false
+  }
+
+  return withContentSriSync(cache, integrity, (cpath, sri) => {
+    try {
+      const stat = fs.statSync(cpath)
+      return { size: stat.size, sri, stat }
+    } catch (err) {
+      if (err.code === 'ENOENT') {
+        return false
+      }
+
+      if (err.code === 'EPERM') {
+        /* istanbul ignore else */
+        if (process.platform !== 'win32') {
+          throw err
+        } else {
+          return false
+        }
+      }
+    }
+  })
+}
+
+async function withContentSri (cache, integrity, fn) {
+  const sri = ssri.parse(integrity)
+  // If `integrity` has multiple entries, pick the first digest
+  // with available local data.
+  const algo = sri.pickAlgorithm()
+  const digests = sri[algo]
+
+  if (digests.length <= 1) {
+    const cpath = contentPath(cache, digests[0])
+    return fn(cpath, digests[0])
+  } else {
+    // Can't use race here because a generic error can happen before
+    // a ENOENT error, and can happen before a valid result
+    const results = await Promise.all(digests.map(async (meta) => {
+      try {
+        return await withContentSri(cache, meta, fn)
+      } catch (err) {
+        if (err.code === 'ENOENT') {
+          return Object.assign(
+            new Error('No matching content found for ' + sri.toString()),
+            { code: 'ENOENT' }
+          )
+        }
+        return err
+      }
+    }))
+    // Return the first non error if it is found
+    const result = results.find((r) => !(r instanceof Error))
+    if (result) {
+      return result
+    }
+
+    // Throw the No matching content found error
+    const enoentError = results.find((r) => r.code === 'ENOENT')
+    if (enoentError) {
+      throw enoentError
+    }
+
+    // Throw generic error
+    throw results.find((r) => r instanceof Error)
+  }
+}
+
+function withContentSriSync (cache, integrity, fn) {
+  const sri = ssri.parse(integrity)
+  // If `integrity` has multiple entries, pick the first digest
+  // with available local data.
+  const algo = sri.pickAlgorithm()
+  const digests = sri[algo]
+  if (digests.length <= 1) {
+    const cpath = contentPath(cache, digests[0])
+    return fn(cpath, digests[0])
+  } else {
+    let lastErr = null
+    for (const meta of digests) {
+      try {
+        return withContentSriSync(cache, meta, fn)
+      } catch (err) {
+        lastErr = err
+      }
+    }
+    throw lastErr
+  }
+}
+
+function sizeError (expected, found) {
+  /* eslint-disable-next-line max-len */
+  const err = new Error(`Bad data size: expected inserted data to be ${expected} bytes, but got ${found} instead`)
+  err.expected = expected
+  err.found = found
+  err.code = 'EBADSIZE'
+  return err
+}
+
+function integrityError (sri, path) {
+  const err = new Error(`Integrity verification failed for ${sri} (${path})`)
+  err.code = 'EINTEGRITY'
+  err.sri = sri
+  err.path = path
+  return err
+}

node_modules/cacache/lib/content/rm.js

@@ -0,0 +1,20 @@
+'use strict'
+
+const util = require('util')
+
+const contentPath = require('./path')
+const { hasContent } = require('./read')
+const rimraf = util.promisify(require('rimraf'))
+
+module.exports = rm
+
+async function rm (cache, integrity) {
+  const content = await hasContent(cache, integrity)
+  // ~pretty~ sure we can't end up with a content lacking sri, but be safe
+  if (content && content.sri) {
+    await rimraf(contentPath(cache, content.sri))
+    return true
+  } else {
+    return false
+  }
+}

node_modules/cacache/lib/content/write.js

@@ -0,0 +1,189 @@
+'use strict'
+
+const events = require('events')
+const util = require('util')
+
+const contentPath = require('./path')
+const fixOwner = require('../util/fix-owner')
+const fs = require('@npmcli/fs')
+const moveFile = require('../util/move-file')
+const Minipass = require('minipass')
+const Pipeline = require('minipass-pipeline')
+const Flush = require('minipass-flush')
+const path = require('path')
+const rimraf = util.promisify(require('rimraf'))
+const ssri = require('ssri')
+const uniqueFilename = require('unique-filename')
+const fsm = require('fs-minipass')
+
+module.exports = write
+
+async function write (cache, data, opts = {}) {
+  const { algorithms, size, integrity } = opts
+  if (algorithms && algorithms.length > 1) {
+    throw new Error('opts.algorithms only supports a single algorithm for now')
+  }
+
+  if (typeof size === 'number' && data.length !== size) {
+    throw sizeError(size, data.length)
+  }
+
+  const sri = ssri.fromData(data, algorithms ? { algorithms } : {})
+  if (integrity && !ssri.checkData(data, integrity, opts)) {
+    throw checksumError(integrity, sri)
+  }
+
+  const tmp = await makeTmp(cache, opts)
+  try {
+    await fs.writeFile(tmp.target, data, { flag: 'wx' })
+    await moveToDestination(tmp, cache, sri, opts)
+    return { integrity: sri, size: data.length }
+  } finally {
+    if (!tmp.moved) {
+      await rimraf(tmp.target)
+    }
+  }
+}
+
+module.exports.stream = writeStream
+
+// writes proxied to the 'inputStream' that is passed to the Promise
+// 'end' is deferred until content is handled.
+class CacacheWriteStream extends Flush {
+  constructor (cache, opts) {
+    super()
+    this.opts = opts
+    this.cache = cache
+    this.inputStream = new Minipass()
+    this.inputStream.on('error', er => this.emit('error', er))
+    this.inputStream.on('drain', () => this.emit('drain'))
+    this.handleContentP = null
+  }
+
+  write (chunk, encoding, cb) {
+    if (!this.handleContentP) {
+      this.handleContentP = handleContent(
+        this.inputStream,
+        this.cache,
+        this.opts
+      )
+    }
+    return this.inputStream.write(chunk, encoding, cb)
+  }
+
+  flush (cb) {
+    this.inputStream.end(() => {
+      if (!this.handleContentP) {
+        const e = new Error('Cache input stream was empty')
+        e.code = 'ENODATA'
+        // empty streams are probably emitting end right away.
+        // defer this one tick by rejecting a promise on it.
+        return Promise.reject(e).catch(cb)
+      }
+      // eslint-disable-next-line promise/catch-or-return
+      this.handleContentP.then(
+        (res) => {
+          res.integrity && this.emit('integrity', res.integrity)
+          // eslint-disable-next-line promise/always-return
+          res.size !== null && this.emit('size', res.size)
+          cb()
+        },
+        (er) => cb(er)
+      )
+    })
+  }
+}
+
+function writeStream (cache, opts = {}) {
+  return new CacacheWriteStream(cache, opts)
+}
+
+async function handleContent (inputStream, cache, opts) {
+  const tmp = await makeTmp(cache, opts)
+  try {
+    const res = await pipeToTmp(inputStream, cache, tmp.target, opts)
+    await moveToDestination(
+      tmp,
+      cache,
+      res.integrity,
+      opts
+    )
+    return res
+  } finally {
+    if (!tmp.moved) {
+      await rimraf(tmp.target)
+    }
+  }
+}
+
+async function pipeToTmp (inputStream, cache, tmpTarget, opts) {
+  const outStream = new fsm.WriteStream(tmpTarget, {
+    flags: 'wx',
+  })
+
+  if (opts.integrityEmitter) {
+    // we need to create these all simultaneously since they can fire in any order
+    const [integrity, size] = await Promise.all([
+      events.once(opts.integrityEmitter, 'integrity').then(res => res[0]),
+      events.once(opts.integrityEmitter, 'size').then(res => res[0]),
+      new Pipeline(inputStream, outStream).promise(),
+    ])
+    return { integrity, size }
+  }
+
+  let integrity
+  let size
+  const hashStream = ssri.integrityStream({
+    integrity: opts.integrity,
+    algorithms: opts.algorithms,
+    size: opts.size,
+  })
+  hashStream.on('integrity', i => {
+    integrity = i
+  })
+  hashStream.on('size', s => {
+    size = s
+  })
+
+  const pipeline = new Pipeline(inputStream, hashStream, outStream)
+  await pipeline.promise()
+  return { integrity, size }
+}
+
+async function makeTmp (cache, opts) {
+  const tmpTarget = uniqueFilename(path.join(cache, 'tmp'), opts.tmpPrefix)
+  await fixOwner.mkdirfix(cache, path.dirname(tmpTarget))
+  return {
+    target: tmpTarget,
+    moved: false,
+  }
+}
+
+async function moveToDestination (tmp, cache, sri, opts) {
+  const destination = contentPath(cache, sri)
+  const destDir = path.dirname(destination)
+
+  await fixOwner.mkdirfix(cache, destDir)
+  await moveFile(tmp.target, destination)
+  tmp.moved = true
+  await fixOwner.chownr(cache, destination)
+}
+
+function sizeError (expected, found) {
+  /* eslint-disable-next-line max-len */
+  const err = new Error(`Bad data size: expected inserted data to be ${expected} bytes, but got ${found} instead`)
+  err.expected = expected
+  err.found = found
+  err.code = 'EBADSIZE'
+  return err
+}
+
+function checksumError (expected, found) {
+  const err = new Error(`Integrity check failed:
+  Wanted: ${expected}
+   Found: ${found}`)
+  err.code = 'EINTEGRITY'
+  err.expected = expected
+  err.found = found
+  return err
+}

node_modules/cacache/lib/entry-index.js

@@ -0,0 +1,404 @@
+'use strict'
+
+const util = require('util')
+const crypto = require('crypto')
+const fs = require('@npmcli/fs')
+const Minipass = require('minipass')
+const path = require('path')
+const ssri = require('ssri')
+const uniqueFilename = require('unique-filename')
+
+const contentPath = require('./content/path')
+const fixOwner = require('./util/fix-owner')
+const hashToSegments = require('./util/hash-to-segments')
+const indexV = require('../package.json')['cache-version'].index
+const moveFile = require('@npmcli/move-file')
+const _rimraf = require('rimraf')
+const rimraf = util.promisify(_rimraf)
+rimraf.sync = _rimraf.sync
+
+module.exports.NotFoundError = class NotFoundError extends Error {
+  constructor (cache, key) {
+    super(`No cache entry for ${key} found in ${cache}`)
+    this.code = 'ENOENT'
+    this.cache = cache
+    this.key = key
+  }
+}
+
+module.exports.compact = compact
+
+async function compact (cache, key, matchFn, opts = {}) {
+  const bucket = bucketPath(cache, key)
+  const entries = await bucketEntries(bucket)
+  const newEntries = []
+  // we loop backwards because the bottom-most result is the newest
+  // since we add new entries with appendFile
+  for (let i = entries.length - 1; i >= 0; --i) {
+    const entry = entries[i]
+    // a null integrity could mean either a delete was appended
+    // or the user has simply stored an index that does not map
+    // to any content. we determine if the user wants to keep the
+    // null integrity based on the validateEntry function passed in options.
+    // if the integrity is null and no validateEntry is provided, we break
+    // as we consider the null integrity to be a deletion of everything
+    // that came before it.
+    if (entry.integrity === null && !opts.validateEntry) {
+      break
+    }
+
+    // if this entry is valid, and it is either the first entry or
+    // the newEntries array doesn't already include an entry that
+    // matches this one based on the provided matchFn, then we add
+    // it to the beginning of our list
+    if ((!opts.validateEntry || opts.validateEntry(entry) === true) &&
+      (newEntries.length === 0 ||
+        !newEntries.find((oldEntry) => matchFn(oldEntry, entry)))) {
+      newEntries.unshift(entry)
+    }
+  }
+
+  const newIndex = '\n' + newEntries.map((entry) => {
+    const stringified = JSON.stringify(entry)
+    const hash = hashEntry(stringified)
+    return `${hash}\t${stringified}`
+  }).join('\n')
+
+  const setup = async () => {
+    const target = uniqueFilename(path.join(cache, 'tmp'), opts.tmpPrefix)
+    await fixOwner.mkdirfix(cache, path.dirname(target))
+    return {
+      target,
+      moved: false,
+    }
+  }
+
+  const teardown = async (tmp) => {
+    if (!tmp.moved) {
+      return rimraf(tmp.target)
+    }
+  }
+
+  const write = async (tmp) => {
+    await fs.writeFile(tmp.target, newIndex, { flag: 'wx' })
+    await fixOwner.mkdirfix(cache, path.dirname(bucket))
+    // we use @npmcli/move-file directly here because we
+    // want to overwrite the existing file
+    await moveFile(tmp.target, bucket)
+    tmp.moved = true
+    try {
+      await fixOwner.chownr(cache, bucket)
+    } catch (err) {
+      if (err.code !== 'ENOENT') {
+        throw err
+      }
+    }
+  }
+
+  // write the file atomically
+  const tmp = await setup()
+  try {
+    await write(tmp)
+  } finally {
+    await teardown(tmp)
+  }
+
+  // we reverse the list we generated such that the newest
+  // entries come first in order to make looping through them easier
+  // the true passed to formatEntry tells it to keep null
+  // integrity values, if they made it this far it's because
+  // validateEntry returned true, and as such we should return it
+  return newEntries.reverse().map((entry) => formatEntry(cache, entry, true))
+}
+
+module.exports.insert = insert
+
+async function insert (cache, key, integrity, opts = {}) {
+  const { metadata, size } = opts
+  const bucket = bucketPath(cache, key)
+  const entry = {
+    key,
+    integrity: integrity && ssri.stringify(integrity),
+    time: Date.now(),
+    size,
+    metadata,
+  }
+  try {
+    await fixOwner.mkdirfix(cache, path.dirname(bucket))
+    const stringified = JSON.stringify(entry)
+    // NOTE - Cleverness ahoy!
+    //
+    // This works because it's tremendously unlikely for an entry to corrupt
+    // another while still preserving the string length of the JSON in
+    // question. So, we just slap the length in there and verify it on read.
+    //
+    // Thanks to @isaacs for the whiteboarding session that ended up with
+    // this.
+    await fs.appendFile(bucket, `\n${hashEntry(stringified)}\t${stringified}`)
+    await fixOwner.chownr(cache, bucket)
+  } catch (err) {
+    if (err.code === 'ENOENT') {
+      return undefined
+    }
+
+    throw err
+    // There's a class of race conditions that happen when things get deleted
+    // during fixOwner, or between the two mkdirfix/chownr calls.
+    //
+    // It's perfectly fine to just not bother in those cases and lie
+    // that the index entry was written. Because it's a cache.
+  }
+  return formatEntry(cache, entry)
+}
+
+module.exports.insert.sync = insertSync
+
+function insertSync (cache, key, integrity, opts = {}) {
+  const { metadata, size } = opts
+  const bucket = bucketPath(cache, key)
+  const entry = {
+    key,
+    integrity: integrity && ssri.stringify(integrity),
+    time: Date.now(),
+    size,
+    metadata,
+  }
+  fixOwner.mkdirfix.sync(cache, path.dirname(bucket))
+  const stringified = JSON.stringify(entry)
+  fs.appendFileSync(bucket, `\n${hashEntry(stringified)}\t${stringified}`)
+  try {
+    fixOwner.chownr.sync(cache, bucket)
+  } catch (err) {
+    if (err.code !== 'ENOENT') {
+      throw err
+    }
+  }
+  return formatEntry(cache, entry)
+}
+
+module.exports.find = find
+
+async function find (cache, key) {
+  const bucket = bucketPath(cache, key)
+  try {
+    const entries = await bucketEntries(bucket)
+    return entries.reduce((latest, next) => {
+      if (next && next.key === key) {
+        return formatEntry(cache, next)
+      } else {
+        return latest
+      }
+    }, null)
+  } catch (err) {
+    if (err.code === 'ENOENT') {
+      return null
+    } else {
+      throw err
+    }
+  }
+}
+
+module.exports.find.sync = findSync
+
+function findSync (cache, key) {
+  const bucket = bucketPath(cache, key)
+  try {
+    return bucketEntriesSync(bucket).reduce((latest, next) => {
+      if (next && next.key === key) {
+        return formatEntry(cache, next)
+      } else {
+        return latest
+      }
+    }, null)
+  } catch (err) {
+    if (err.code === 'ENOENT') {
+      return null
+    } else {
+      throw err
+    }
+  }
+}
+
+module.exports.delete = del
+
+function del (cache, key, opts = {}) {
+  if (!opts.removeFully) {
+    return insert(cache, key, null, opts)
+  }
+
+  const bucket = bucketPath(cache, key)
+  return rimraf(bucket)
+}
+
+module.exports.delete.sync = delSync
+
+function delSync (cache, key, opts = {}) {
+  if (!opts.removeFully) {
+    return insertSync(cache, key, null, opts)
+  }
+
+  const bucket = bucketPath(cache, key)
+  return rimraf.sync(bucket)
+}
+
+module.exports.lsStream = lsStream
+
+function lsStream (cache) {
+  const indexDir = bucketDir(cache)
+  const stream = new Minipass({ objectMode: true })
+
+  // Set all this up to run on the stream and then just return the stream
+  Promise.resolve().then(async () => {
+    const buckets = await readdirOrEmpty(indexDir)
+    await Promise.all(buckets.map(async (bucket) => {
+      const bucketPath = path.join(indexDir, bucket)
+      const subbuckets = await readdirOrEmpty(bucketPath)
+      await Promise.all(subbuckets.map(async (subbucket) => {
+        const subbucketPath = path.join(bucketPath, subbucket)
+
+        // "/cachename/<bucket 0xFF>/<bucket 0xFF>./*"
+        const subbucketEntries = await readdirOrEmpty(subbucketPath)
+        await Promise.all(subbucketEntries.map(async (entry) => {
+          const entryPath = path.join(subbucketPath, entry)
+          try {
+            const entries = await bucketEntries(entryPath)
+            // using a Map here prevents duplicate keys from showing up
+            // twice, I guess?
+            const reduced = entries.reduce((acc, entry) => {
+              acc.set(entry.key, entry)
+              return acc
+            }, new Map())
+            // reduced is a map of key => entry
+            for (const entry of reduced.values()) {
+              const formatted = formatEntry(cache, entry)
+              if (formatted) {
+                stream.write(formatted)
+              }
+            }
+          } catch (err) {
+            if (err.code === 'ENOENT') {
+              return undefined
+            }
+            throw err
+          }
+        }))
+      }))
+    }))
+    stream.end()
+    return stream
+  }).catch(err => stream.emit('error', err))
+
+  return stream
+}
+
+module.exports.ls = ls
+
+async function ls (cache) {
+  const entries = await lsStream(cache).collect()
+  return entries.reduce((acc, xs) => {
+    acc[xs.key] = xs
+    return acc
+  }, {})
+}
+
+module.exports.bucketEntries = bucketEntries
+
+async function bucketEntries (bucket, filter) {
+  const data = await fs.readFile(bucket, 'utf8')
+  return _bucketEntries(data, filter)
+}
+
+module.exports.bucketEntries.sync = bucketEntriesSync
+
+function bucketEntriesSync (bucket, filter) {
+  const data = fs.readFileSync(bucket, 'utf8')
+  return _bucketEntries(data, filter)
+}
+
+function _bucketEntries (data, filter) {
+  const entries = []
+  data.split('\n').forEach((entry) => {
+    if (!entry) {
+      return
+    }
+
+    const pieces = entry.split('\t')
+    if (!pieces[1] || hashEntry(pieces[1]) !== pieces[0]) {
+      // Hash is no good! Corruption or malice? Doesn't matter!
+      // EJECT EJECT
+      return
+    }
+    let obj
+    try {
+      obj = JSON.parse(pieces[1])
+    } catch (e) {
+      // Entry is corrupted!
+      return
+    }
+    if (obj) {
+      entries.push(obj)
+    }
+  })
+  return entries
+}
+
+module.exports.bucketDir = bucketDir
+
+function bucketDir (cache) {
+  return path.join(cache, `index-v${indexV}`)
+}
+
+module.exports.bucketPath = bucketPath
+
+function bucketPath (cache, key) {
+  const hashed = hashKey(key)
+  return path.join.apply(
+    path,
+    [bucketDir(cache)].concat(hashToSegments(hashed))
+  )
+}
+
+module.exports.hashKey = hashKey
+
+function hashKey (key) {
+  return hash(key, 'sha256')
+}
+
+module.exports.hashEntry = hashEntry
+
+function hashEntry (str) {
+  return hash(str, 'sha1')
+}
+
+function hash (str, digest) {
+  return crypto
+    .createHash(digest)
+    .update(str)
+    .digest('hex')
+}
+
+function formatEntry (cache, entry, keepAll) {
+  // Treat null digests as deletions. They'll shadow any previous entries.
+  if (!entry.integrity && !keepAll) {
+    return null
+  }
+
+  return {
+    key: entry.key,
+    integrity: entry.integrity,
+    path: entry.integrity ? contentPath(cache, entry.integrity) : undefined,
+    size: entry.size,
+    time: entry.time,
+    metadata: entry.metadata,
+  }
+}
+
+function readdirOrEmpty (dir) {
+  return fs.readdir(dir).catch((err) => {
+    if (err.code === 'ENOENT' || err.code === 'ENOTDIR') {
+      return []
+    }
+
+    throw err
+  })
+}

node_modules/cacache/lib/get.js

@@ -0,0 +1,225 @@
+'use strict'
+
+const Collect = require('minipass-collect')
+const Minipass = require('minipass')
+const Pipeline = require('minipass-pipeline')
+
+const index = require('./entry-index')
+const memo = require('./memoization')
+const read = require('./content/read')
+
+async function getData (cache, key, opts = {}) {
+  const { integrity, memoize, size } = opts
+  const memoized = memo.get(cache, key, opts)
+  if (memoized && memoize !== false) {
+    return {
+      metadata: memoized.entry.metadata,
+      data: memoized.data,
+      integrity: memoized.entry.integrity,
+      size: memoized.entry.size,
+    }
+  }
+
+  const entry = await index.find(cache, key, opts)
+  if (!entry) {
+    throw new index.NotFoundError(cache, key)
+  }
+  const data = await read(cache, entry.integrity, { integrity, size })
+  if (memoize) {
+    memo.put(cache, entry, data, opts)
+  }
+
+  return {
+    data,
+    metadata: entry.metadata,
+    size: entry.size,
+    integrity: entry.integrity,
+  }
+}
+module.exports = getData
+
+async function getDataByDigest (cache, key, opts = {}) {
+  const { integrity, memoize, size } = opts
+  const memoized = memo.get.byDigest(cache, key, opts)
+  if (memoized && memoize !== false) {
+    return memoized
+  }
+
+  const res = await read(cache, key, { integrity, size })
+  if (memoize) {
+    memo.put.byDigest(cache, key, res, opts)
+  }
+  return res
+}
+module.exports.byDigest = getDataByDigest
+
+function getDataSync (cache, key, opts = {}) {
+  const { integrity, memoize, size } = opts
+  const memoized = memo.get(cache, key, opts)
+
+  if (memoized && memoize !== false) {
+    return {
+      metadata: memoized.entry.metadata,
+      data: memoized.data,
+      integrity: memoized.entry.integrity,
+      size: memoized.entry.size,
+    }
+  }
+  const entry = index.find.sync(cache, key, opts)
+  if (!entry) {
+    throw new index.NotFoundError(cache, key)
+  }
+  const data = read.sync(cache, entry.integrity, {
+    integrity: integrity,
+    size: size,
+  })
+  const res = {
+    metadata: entry.metadata,
+    data: data,
+    size: entry.size,
+    integrity: entry.integrity,
+  }
+  if (memoize) {
+    memo.put(cache, entry, res.data, opts)
+  }
+
+  return res
+}
+
+module.exports.sync = getDataSync
+
+function getDataByDigestSync (cache, digest, opts = {}) {
+  const { integrity, memoize, size } = opts
+  const memoized = memo.get.byDigest(cache, digest, opts)
+
+  if (memoized && memoize !== false) {
+    return memoized
+  }
+
+  const res = read.sync(cache, digest, {
+    integrity: integrity,
+    size: size,
+  })
+  if (memoize) {
+    memo.put.byDigest(cache, digest, res, opts)
+  }
+
+  return res
+}
+module.exports.sync.byDigest = getDataByDigestSync
+
+const getMemoizedStream = (memoized) => {
+  const stream = new Minipass()
+  stream.on('newListener', function (ev, cb) {
+    ev === 'metadata' && cb(memoized.entry.metadata)
+    ev === 'integrity' && cb(memoized.entry.integrity)
+    ev === 'size' && cb(memoized.entry.size)
+  })
+  stream.end(memoized.data)
+  return stream
+}
+
+function getStream (cache, key, opts = {}) {
+  const { memoize, size } = opts
+  const memoized = memo.get(cache, key, opts)
+  if (memoized && memoize !== false) {
+    return getMemoizedStream(memoized)
+  }
+
+  const stream = new Pipeline()
+  // Set all this up to run on the stream and then just return the stream
+  Promise.resolve().then(async () => {
+    const entry = await index.find(cache, key)
+    if (!entry) {
+      throw new index.NotFoundError(cache, key)
+    }
+
+    stream.emit('metadata', entry.metadata)
+    stream.emit('integrity', entry.integrity)
+    stream.emit('size', entry.size)
+    stream.on('newListener', function (ev, cb) {
+      ev === 'metadata' && cb(entry.metadata)
+      ev === 'integrity' && cb(entry.integrity)
+      ev === 'size' && cb(entry.size)
+    })
+
+    const src = read.readStream(
+      cache,
+      entry.integrity,
+      { ...opts, size: typeof size !== 'number' ? entry.size : size }
+    )
+
+    if (memoize) {
+      const memoStream = new Collect.PassThrough()
+      memoStream.on('collect', data => memo.put(cache, entry, data, opts))
+      stream.unshift(memoStream)
+    }
+    stream.unshift(src)
+    return stream
+  }).catch((err) => stream.emit('error', err))
+
+  return stream
+}
+
+module.exports.stream = getStream
+
+function getStreamDigest (cache, integrity, opts = {}) {
+  const { memoize } = opts
+  const memoized = memo.get.byDigest(cache, integrity, opts)
+  if (memoized && memoize !== false) {
+    const stream = new Minipass()
+    stream.end(memoized)
+    return stream
+  } else {
+    const stream = read.readStream(cache, integrity, opts)
+    if (!memoize) {
+      return stream
+    }
+
+    const memoStream = new Collect.PassThrough()
+    memoStream.on('collect', data => memo.put.byDigest(
+      cache,
+      integrity,
+      data,
+      opts
+    ))
+    return new Pipeline(stream, memoStream)
+  }
+}
+
+module.exports.stream.byDigest = getStreamDigest
+
+function info (cache, key, opts = {}) {
+  const { memoize } = opts
+  const memoized = memo.get(cache, key, opts)
+  if (memoized && memoize !== false) {
+    return Promise.resolve(memoized.entry)
+  } else {
+    return index.find(cache, key)
+  }
+}
+module.exports.info = info
+
+async function copy (cache, key, dest, opts = {}) {
+  const entry = await index.find(cache, key, opts)
+  if (!entry) {
+    throw new index.NotFoundError(cache, key)
+  }
+  await read.copy(cache, entry.integrity, dest, opts)
+  return {
+    metadata: entry.metadata,
+    size: entry.size,
+    integrity: entry.integrity,
+  }
+}
+
+module.exports.copy = copy
+
+async function copyByDigest (cache, key, dest, opts = {}) {
+  await read.copy(cache, key, dest, opts)
+  return key
+}
+
+module.exports.copy.byDigest = copyByDigest
+
+module.exports.hasContent = read.hasContent

node_modules/cacache/lib/index.js

@@ -0,0 +1,45 @@
+'use strict'
+
+const get = require('./get.js')
+const put = require('./put.js')
+const rm = require('./rm.js')
+const verify = require('./verify.js')
+const { clearMemoized } = require('./memoization.js')
+const tmp = require('./util/tmp.js')
+const index = require('./entry-index.js')
+
+module.exports.index = {}
+module.exports.index.compact = index.compact
+module.exports.index.insert = index.insert
+
+module.exports.ls = index.ls
+module.exports.ls.stream = index.lsStream
+
+module.exports.get = get
+module.exports.get.byDigest = get.byDigest
+module.exports.get.sync = get.sync
+module.exports.get.sync.byDigest = get.sync.byDigest
+module.exports.get.stream = get.stream
+module.exports.get.stream.byDigest = get.stream.byDigest
+module.exports.get.copy = get.copy
+module.exports.get.copy.byDigest = get.copy.byDigest
+module.exports.get.info = get.info
+module.exports.get.hasContent = get.hasContent
+module.exports.get.hasContent.sync = get.hasContent.sync
+
+module.exports.put = put
+module.exports.put.stream = put.stream
+
+module.exports.rm = rm.entry
+module.exports.rm.all = rm.all
+module.exports.rm.entry = module.exports.rm
+module.exports.rm.content = rm.content
+
+module.exports.clearMemoized = clearMemoized
+
+module.exports.tmp = {}
+module.exports.tmp.mkdir = tmp.mkdir
+module.exports.tmp.withTmp = tmp.withTmp
+
+module.exports.verify = verify
+module.exports.verify.lastRun = verify.lastRun

node_modules/cacache/lib/memoization.js

@@ -0,0 +1,72 @@
+'use strict'
+
+const LRU = require('lru-cache')
+
+const MEMOIZED = new LRU({
+  max: 500,
+  maxSize: 50 * 1024 * 1024, // 50MB
+  ttl: 3 * 60 * 1000, // 3 minutes
+  sizeCalculation: (entry, key) => key.startsWith('key:') ? entry.data.length : entry.length,
+})
+
+module.exports.clearMemoized = clearMemoized
+
+function clearMemoized () {
+  const old = {}
+  MEMOIZED.forEach((v, k) => {
+    old[k] = v
+  })
+  MEMOIZED.clear()
+  return old
+}
+
+module.exports.put = put
+
+function put (cache, entry, data, opts) {
+  pickMem(opts).set(`key:${cache}:${entry.key}`, { entry, data })
+  putDigest(cache, entry.integrity, data, opts)
+}
+
+module.exports.put.byDigest = putDigest
+
+function putDigest (cache, integrity, data, opts) {
+  pickMem(opts).set(`digest:${cache}:${integrity}`, data)
+}
+
+module.exports.get = get
+
+function get (cache, key, opts) {
+  return pickMem(opts).get(`key:${cache}:${key}`)
+}
+
+module.exports.get.byDigest = getDigest
+
+function getDigest (cache, integrity, opts) {
+  return pickMem(opts).get(`digest:${cache}:${integrity}`)
+}
+
+class ObjProxy {
+  constructor (obj) {
+    this.obj = obj
+  }
+
+  get (key) {
+    return this.obj[key]
+  }
+
+  set (key, val) {
+    this.obj[key] = val
+  }
+}
+
+function pickMem (opts) {
+  if (!opts || !opts.memoize) {
+    return MEMOIZED
+  } else if (opts.memoize.get && opts.memoize.set) {
+    return opts.memoize
+  } else if (typeof opts.memoize === 'object') {
+    return new ObjProxy(opts.memoize)
+  } else {
+    return MEMOIZED
+  }
+}

node_modules/cacache/lib/put.js

@@ -0,0 +1,80 @@
+'use strict'
+
+const index = require('./entry-index')
+const memo = require('./memoization')
+const write = require('./content/write')
+const Flush = require('minipass-flush')
+const { PassThrough } = require('minipass-collect')
+const Pipeline = require('minipass-pipeline')
+
+const putOpts = (opts) => ({
+  algorithms: ['sha512'],
+  ...opts,
+})
+
+module.exports = putData
+
+async function putData (cache, key, data, opts = {}) {
+  const { memoize } = opts
+  opts = putOpts(opts)
+  const res = await write(cache, data, opts)
+  const entry = await index.insert(cache, key, res.integrity, { ...opts, size: res.size })
+  if (memoize) {
+    memo.put(cache, entry, data, opts)
+  }
+
+  return res.integrity
+}
+
+module.exports.stream = putStream
+
+function putStream (cache, key, opts = {}) {
+  const { memoize } = opts
+  opts = putOpts(opts)
+  let integrity
+  let size
+  let error
+
+  let memoData
+  const pipeline = new Pipeline()
+  // first item in the pipeline is the memoizer, because we need
+  // that to end first and get the collected data.
+  if (memoize) {
+    const memoizer = new PassThrough().on('collect', data => {
+      memoData = data
+    })
+    pipeline.push(memoizer)
+  }
+
+  // contentStream is a write-only, not a passthrough
+  // no data comes out of it.
+  const contentStream = write.stream(cache, opts)
+    .on('integrity', (int) => {
+      integrity = int
+    })
+    .on('size', (s) => {
+      size = s
+    })
+    .on('error', (err) => {
+      error = err
+    })
+
+  pipeline.push(contentStream)
+
+  // last but not least, we write the index and emit hash and size,
+  // and memoize if we're doing that
+  pipeline.push(new Flush({
+    async flush () {
+      if (!error) {
+        const entry = await index.insert(cache, key, integrity, { ...opts, size })
+        if (memoize && memoData) {
+          memo.put(cache, entry, memoData, opts)
+        }
+        pipeline.emit('integrity', integrity)
+        pipeline.emit('size', size)
+      }
+    },
+  }))
+
+  return pipeline
+}

node_modules/cacache/lib/rm.js

@@ -0,0 +1,31 @@
+'use strict'
+
+const util = require('util')
+
+const index = require('./entry-index')
+const memo = require('./memoization')
+const path = require('path')
+const rimraf = util.promisify(require('rimraf'))
+const rmContent = require('./content/rm')
+
+module.exports = entry
+module.exports.entry = entry
+
+function entry (cache, key, opts) {
+  memo.clearMemoized()
+  return index.delete(cache, key, opts)
+}
+
+module.exports.content = content
+
+function content (cache, integrity) {
+  memo.clearMemoized()
+  return rmContent(cache, integrity)
+}
+
+module.exports.all = all
+
+function all (cache) {
+  memo.clearMemoized()
+  return rimraf(path.join(cache, '*(content-*|index-*)'))
+}

node_modules/cacache/lib/util/fix-owner.js

@@ -0,0 +1,145 @@
+'use strict'
+
+const util = require('util')
+
+const chownr = util.promisify(require('chownr'))
+const mkdirp = require('mkdirp')
+const inflight = require('promise-inflight')
+const inferOwner = require('infer-owner')
+
+// Memoize getuid()/getgid() calls.
+// patch process.setuid/setgid to invalidate cached value on change
+const self = { uid: null, gid: null }
+const getSelf = () => {
+  if (typeof self.uid !== 'number') {
+    self.uid = process.getuid()
+    const setuid = process.setuid
+    process.setuid = (uid) => {
+      self.uid = null
+      process.setuid = setuid
+      return process.setuid(uid)
+    }
+  }
+  if (typeof self.gid !== 'number') {
+    self.gid = process.getgid()
+    const setgid = process.setgid
+    process.setgid = (gid) => {
+      self.gid = null
+      process.setgid = setgid
+      return process.setgid(gid)
+    }
+  }
+}
+
+module.exports.chownr = fixOwner
+
+async function fixOwner (cache, filepath) {
+  if (!process.getuid) {
+    // This platform doesn't need ownership fixing
+    return
+  }
+
+  getSelf()
+  if (self.uid !== 0) {
+    // almost certainly can't chown anyway
+    return
+  }
+
+  const { uid, gid } = await inferOwner(cache)
+
+  // No need to override if it's already what we used.
+  if (self.uid === uid && self.gid === gid) {
+    return
+  }
+
+  return inflight('fixOwner: fixing ownership on ' + filepath, () =>
+    chownr(
+      filepath,
+      typeof uid === 'number' ? uid : self.uid,
+      typeof gid === 'number' ? gid : self.gid
+    ).catch((err) => {
+      if (err.code === 'ENOENT') {
+        return null
+      }
+
+      throw err
+    })
+  )
+}
+
+module.exports.chownr.sync = fixOwnerSync
+
+function fixOwnerSync (cache, filepath) {
+  if (!process.getuid) {
+    // This platform doesn't need ownership fixing
+    return
+  }
+  const { uid, gid } = inferOwner.sync(cache)
+  getSelf()
+  if (self.uid !== 0) {
+    // almost certainly can't chown anyway
+    return
+  }
+
+  if (self.uid === uid && self.gid === gid) {
+    // No need to override if it's already what we used.
+    return
+  }
+  try {
+    chownr.sync(
+      filepath,
+      typeof uid === 'number' ? uid : self.uid,
+      typeof gid === 'number' ? gid : self.gid
+    )
+  } catch (err) {
+    // only catch ENOENT, any other error is a problem.
+    if (err.code === 'ENOENT') {
+      return null
+    }
+
+    throw err
+  }
+}
+
+module.exports.mkdirfix = mkdirfix
+
+async function mkdirfix (cache, p, cb) {
+  // we have to infer the owner _before_ making the directory, even though
+  // we aren't going to use the results, since the cache itself might not
+  // exist yet.  If we mkdirp it, then our current uid/gid will be assumed
+  // to be correct if it creates the cache folder in the process.
+  await inferOwner(cache)
+  try {
+    const made = await mkdirp(p)
+    if (made) {
+      await fixOwner(cache, made)
+      return made
+    }
+  } catch (err) {
+    if (err.code === 'EEXIST') {
+      await fixOwner(cache, p)
+      return null
+    }
+    throw err
+  }
+}
+
+module.exports.mkdirfix.sync = mkdirfixSync
+
+function mkdirfixSync (cache, p) {
+  try {
+    inferOwner.sync(cache)
+    const made = mkdirp.sync(p)
+    if (made) {
+      fixOwnerSync(cache, made)
+      return made
+    }
+  } catch (err) {
+    if (err.code === 'EEXIST') {
+      fixOwnerSync(cache, p)
+      return null
+    } else {
+      throw err
+    }
+  }
+}

node_modules/cacache/lib/util/hash-to-segments.js

@@ -0,0 +1,7 @@
+'use strict'
+
+module.exports = hashToSegments
+
+function hashToSegments (hash) {
+  return [hash.slice(0, 2), hash.slice(2, 4), hash.slice(4)]
+}

node_modules/cacache/lib/util/move-file.js

@@ -0,0 +1,56 @@
+'use strict'
+
+const fs = require('@npmcli/fs')
+const move = require('@npmcli/move-file')
+const pinflight = require('promise-inflight')
+
+module.exports = moveFile
+
+async function moveFile (src, dest) {
+  const isWindows = process.platform === 'win32'
+
+  // This isn't quite an fs.rename -- the assumption is that
+  // if `dest` already exists, and we get certain errors while
+  // trying to move it, we should just not bother.
+  //
+  // In the case of cache corruption, users will receive an
+  // EINTEGRITY error elsewhere, and can remove the offending
+  // content their own way.
+  //
+  // Note that, as the name suggests, this strictly only supports file moves.
+  try {
+    await fs.link(src, dest)
+  } catch (err) {
+    if (isWindows && err.code === 'EPERM') {
+      // XXX This is a really weird way to handle this situation, as it
+      // results in the src file being deleted even though the dest
+      // might not exist.  Since we pretty much always write files to
+      // deterministic locations based on content hash, this is likely
+      // ok (or at worst, just ends in a future cache miss).  But it would
+      // be worth investigating at some time in the future if this is
+      // really what we want to do here.
+    } else if (err.code === 'EEXIST' || err.code === 'EBUSY') {
+      // file already exists, so whatever
+    } else {
+      throw err
+    }
+  }
+  try {
+    await Promise.all([
+      fs.unlink(src),
+      !isWindows && fs.chmod(dest, '0444'),
+    ])
+  } catch (e) {
+    return pinflight('cacache-move-file:' + dest, async () => {
+      await fs.stat(dest).catch((err) => {
+        if (err.code !== 'ENOENT') {
+          // Something else is wrong here. Bail bail bail
+          throw err
+        }
+      })
+      // file doesn't already exist! let's try a rename -> copy fallback
+      // only delete if it successfully copies
+      return move(src, dest)
+    })
+  }
+}

node_modules/cacache/lib/util/tmp.js

@@ -0,0 +1,33 @@
+'use strict'
+
+const fs = require('@npmcli/fs')
+
+const fixOwner = require('./fix-owner')
+const path = require('path')
+
+module.exports.mkdir = mktmpdir
+
+async function mktmpdir (cache, opts = {}) {
+  const { tmpPrefix } = opts
+  const tmpDir = path.join(cache, 'tmp')
+  await fs.mkdir(tmpDir, { recursive: true, owner: 'inherit' })
+  // do not use path.join(), it drops the trailing / if tmpPrefix is unset
+  const target = `${tmpDir}${path.sep}${tmpPrefix || ''}`
+  return fs.mkdtemp(target, { owner: 'inherit' })
+}
+
+module.exports.withTmp = withTmp
+
+function withTmp (cache, opts, cb) {
+  if (!cb) {
+    cb = opts
+    opts = {}
+  }
+  return fs.withTempDir(path.join(cache, 'tmp'), cb, opts)
+}
+
+module.exports.fix = fixtmpdir
+
+function fixtmpdir (cache) {
+  return fixOwner(cache, path.join(cache, 'tmp'))
+}

node_modules/cacache/lib/verify.js

@@ -0,0 +1,257 @@
+'use strict'
+
+const util = require('util')
+
+const pMap = require('p-map')
+const contentPath = require('./content/path')
+const fixOwner = require('./util/fix-owner')
+const fs = require('@npmcli/fs')
+const fsm = require('fs-minipass')
+const glob = util.promisify(require('glob'))
+const index = require('./entry-index')
+const path = require('path')
+const rimraf = util.promisify(require('rimraf'))
+const ssri = require('ssri')
+
+const globify = pattern => pattern.split('\\').join('/')
+
+const hasOwnProperty = (obj, key) =>
+  Object.prototype.hasOwnProperty.call(obj, key)
+
+const verifyOpts = (opts) => ({
+  concurrency: 20,
+  log: { silly () {} },
+  ...opts,
+})
+
+module.exports = verify
+
+async function verify (cache, opts) {
+  opts = verifyOpts(opts)
+  opts.log.silly('verify', 'verifying cache at', cache)
+
+  const steps = [
+    markStartTime,
+    fixPerms,
+    garbageCollect,
+    rebuildIndex,
+    cleanTmp,
+    writeVerifile,
+    markEndTime,
+  ]
+
+  const stats = {}
+  for (const step of steps) {
+    const label = step.name
+    const start = new Date()
+    const s = await step(cache, opts)
+    if (s) {
+      Object.keys(s).forEach((k) => {
+        stats[k] = s[k]
+      })
+    }
+    const end = new Date()
+    if (!stats.runTime) {
+      stats.runTime = {}
+    }
+    stats.runTime[label] = end - start
+  }
+  stats.runTime.total = stats.endTime - stats.startTime
+  opts.log.silly(
+    'verify',
+    'verification finished for',
+    cache,
+    'in',
+    `${stats.runTime.total}ms`
+  )
+  return stats
+}
+
+async function markStartTime (cache, opts) {
+  return { startTime: new Date() }
+}
+
+async function markEndTime (cache, opts) {
+  return { endTime: new Date() }
+}
+
+async function fixPerms (cache, opts) {
+  opts.log.silly('verify', 'fixing cache permissions')
+  await fixOwner.mkdirfix(cache, cache)
+  // TODO - fix file permissions too
+  await fixOwner.chownr(cache, cache)
+  return null
+}
+
+// Implements a naive mark-and-sweep tracing garbage collector.
+//
+// The algorithm is basically as follows:
+// 1. Read (and filter) all index entries ("pointers")
+// 2. Mark each integrity value as "live"
+// 3. Read entire filesystem tree in `content-vX/` dir
+// 4. If content is live, verify its checksum and delete it if it fails
+// 5. If content is not marked as live, rimraf it.
+//
+async function garbageCollect (cache, opts) {
+  opts.log.silly('verify', 'garbage collecting content')
+  const indexStream = index.lsStream(cache)
+  const liveContent = new Set()
+  indexStream.on('data', (entry) => {
+    if (opts.filter && !opts.filter(entry)) {
+      return
+    }
+
+    liveContent.add(entry.integrity.toString())
+  })
+  await new Promise((resolve, reject) => {
+    indexStream.on('end', resolve).on('error', reject)
+  })
+  const contentDir = contentPath.contentDir(cache)
+  const files = await glob(globify(path.join(contentDir, '**')), {
+    follow: false,
+    nodir: true,
+    nosort: true,
+  })
+  const stats = {
+    verifiedContent: 0,
+    reclaimedCount: 0,
+    reclaimedSize: 0,
+    badContentCount: 0,
+    keptSize: 0,
+  }
+  await pMap(
+    files,
+    async (f) => {
+      const split = f.split(/[/\\]/)
+      const digest = split.slice(split.length - 3).join('')
+      const algo = split[split.length - 4]
+      const integrity = ssri.fromHex(digest, algo)
+      if (liveContent.has(integrity.toString())) {
+        const info = await verifyContent(f, integrity)
+        if (!info.valid) {
+          stats.reclaimedCount++
+          stats.badContentCount++
+          stats.reclaimedSize += info.size
+        } else {
+          stats.verifiedContent++
+          stats.keptSize += info.size
+        }
+      } else {
+        // No entries refer to this content. We can delete.
+        stats.reclaimedCount++
+        const s = await fs.stat(f)
+        await rimraf(f)
+        stats.reclaimedSize += s.size
+      }
+      return stats
+    },
+    { concurrency: opts.concurrency }
+  )
+  return stats
+}
+
+async function verifyContent (filepath, sri) {
+  const contentInfo = {}
+  try {
+    const { size } = await fs.stat(filepath)
+    contentInfo.size = size
+    contentInfo.valid = true
+    await ssri.checkStream(new fsm.ReadStream(filepath), sri)
+  } catch (err) {
+    if (err.code === 'ENOENT') {
+      return { size: 0, valid: false }
+    }
+    if (err.code !== 'EINTEGRITY') {
+      throw err
+    }
+
+    await rimraf(filepath)
+    contentInfo.valid = false
+  }
+  return contentInfo
+}
+
+async function rebuildIndex (cache, opts) {
+  opts.log.silly('verify', 'rebuilding index')
+  const entries = await index.ls(cache)
+  const stats = {
+    missingContent: 0,
+    rejectedEntries: 0,
+    totalEntries: 0,
+  }
+  const buckets = {}
+  for (const k in entries) {
+    /* istanbul ignore else */
+    if (hasOwnProperty(entries, k)) {
+      const hashed = index.hashKey(k)
+      const entry = entries[k]
+      const excluded = opts.filter && !opts.filter(entry)
+      excluded && stats.rejectedEntries++
+      if (buckets[hashed] && !excluded) {
+        buckets[hashed].push(entry)
+      } else if (buckets[hashed] && excluded) {
+        // skip
+      } else if (excluded) {
+        buckets[hashed] = []
+        buckets[hashed]._path = index.bucketPath(cache, k)
+      } else {
+        buckets[hashed] = [entry]
+        buckets[hashed]._path = index.bucketPath(cache, k)
+      }
+    }
+  }
+  await pMap(
+    Object.keys(buckets),
+    (key) => {
+      return rebuildBucket(cache, buckets[key], stats, opts)
+    },
+    { concurrency: opts.concurrency }
+  )
+  return stats
+}
+
+async function rebuildBucket (cache, bucket, stats, opts) {
+  await fs.truncate(bucket._path)
+  // This needs to be serialized because cacache explicitly
+  // lets very racy bucket conflicts clobber each other.
+  for (const entry of bucket) {
+    const content = contentPath(cache, entry.integrity)
+    try {
+      await fs.stat(content)
+      await index.insert(cache, entry.key, entry.integrity, {
+        metadata: entry.metadata,
+        size: entry.size,
+      })
+      stats.totalEntries++
+    } catch (err) {
+      if (err.code === 'ENOENT') {
+        stats.rejectedEntries++
+        stats.missingContent++
+      } else {
+        throw err
+      }
+    }
+  }
+}
+
+function cleanTmp (cache, opts) {
+  opts.log.silly('verify', 'cleaning tmp directory')
+  return rimraf(path.join(cache, 'tmp'))
+}
+
+function writeVerifile (cache, opts) {
+  const verifile = path.join(cache, '_lastverified')
+  opts.log.silly('verify', 'writing verifile to ' + verifile)
+  try {
+    return fs.writeFile(verifile, `${Date.now()}`)
+  } finally {
+    fixOwner.chownr.sync(cache, verifile)
+  }
+}
+
+module.exports.lastRun = lastRun
+
+async function lastRun (cache) {
+  const data = await fs.readFile(path.join(cache, '_lastverified'), { encoding: 'utf8' })
+  return new Date(+data)
+}