Fast, fault-tolerant, cross-platform, disk-based, data-agnostic, content-addressable cache. 

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All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.

### [15.0.4](https://github.com/npm/cacache/compare/v15.0.3...v15.0.4) (2020-06-03)

* replace move-file dep with @npmcli/move-file ([bf88af0](https://github.com/npm/cacache/commit/bf88af04e50cca9b54041151139ffc1fd415e2dc)), closes [#37](https://github.com/npm/cacache/issues/37)

### [15.0.3](https://github.com/npm/cacache/compare/v15.0.2...v15.0.3) (2020-04-28)

* actually remove move-concurrently dep ([29e6eec](https://github.com/npm/cacache/commit/29e6eec9fee73444ee09daf1c1be06ddd5fe57f6))

### [15.0.2](https://github.com/npm/cacache/compare/v15.0.1...v15.0.2) (2020-04-28)

* tacks should be a dev dependency ([93ec158](https://github.com/npm/cacache/commit/93ec15852f0fdf1753ea7f75b4b8926daf8a7565))

## [15.0.1](https://github.com/npm/cacache/compare/v15.0.0...v15.0.1) (2020-04-27)

* **deps:** Use move-file instead of move-file-concurrently. ([92b125](https://github.com/npm/cacache/commit/92b1251a11b9848878b6c0d101b18bd8845acaa6))

## [15.0.0](https://github.com/npm/cacache/compare/v14.0.0...v15.0.0) (2020-02-18)

* drop figgy-pudding and use canonical option names.

* remove figgy-pudding ([57d11bc](https://github.com/npm/cacache/commit/57d11bce34f979247d1057d258acc204c4944491))

## [14.0.0](https://github.com/npm/cacache/compare/v13.0.1...v14.0.0) (2020-01-28)

* **deps:** tar v6 and mkdirp v1 ([5a66e7a](https://github.com/npm/cacache/commit/5a66e7a))

### [13.0.1](https://github.com/npm/cacache/compare/v13.0.0...v13.0.1) (2019-09-30)

* **fix-owner:** chownr.sync quits on non-root uid ([08801be](https://github.com/npm/cacache/commit/08801be))

## [13.0.0](https://github.com/npm/cacache/compare/v12.0.3...v13.0.0) (2019-09-25)

* This subtly changes the streaming interface of

everything in cacache that streams, which is, well, everything in

cacache.  Most users will probably not notice, but any code that

depended on stream behavior always being deferred until next tick will

The mississippi methods 'to', 'from', 'through', and so on, have been

replaced with their Minipass counterparts, and streaming interaction

with the file system is done via fs-minipass.

The following modules are of interest here:

- [minipass](http://npm.im/minipass) The core stream library.

- [fs-minipass](http://npm.im/fs-minipass)  Note that the 'WriteStream'

  class from fs-minipass is _not_ a Minipass stream, but rather a plain

  old EventEmitter that duck types as a Writable.

- [minipass-collect](http://npm.im/minipass-collect) Gather up all the

  data from a stream.  Cacache only uses Collect.PassThrough, which is a

  basic Minipass passthrough stream which emits a 'collect' event with

  the completed data just before the 'end' event.

- [minipass-pipeline](http://npm.im/minipass-pipeline) Connect one or

  more streams into a pipe chain.  Errors anywhere in the pipeline are

  proxied down the chain and then up to the Pipeline object itself.

  Writes go into the head, reads go to the tail.  Used in place of

- [minipass-flush](http://npm.im/minipass-flush) A Minipass passthrough

  stream that defers its 'end' event until after a flush() method has

  completed (either calling the supplied callback, or returning a

  promise.)  Use in place of flush-write-stream (aka mississippi.to).

Streams from through2, concat-stream, and the behavior provided by

end-of-stream are all implemented in Minipass itself.

Features of interest to cacache, which make Minipass a particularly good

- All of the 'endish' events are normalized, so we can just listen on

  'end' and know that finish, prefinish, and close will be handled as

- Minipass doesn't waste time [containing

  zalgo](https://blog.izs.me/2013/08/designing-apis-for-asynchrony).

- Minipass has built-in support for promises that indicate the end or

  error: stream.promise(), stream.collect(), and stream.concat().

- With reliable and consistent timing guarantees, much less

  error-checking logic is required.  We can be more confident that an

  error is being thrown or emitted in the correct place, rather than in

  a callback which is deferred, resulting in a hung promise or

const move = require('@npmcli/move-file')

const pinflight = require('promise-inflight')

  const isWindows = global.__CACACHE_TEST_FAKE_WINDOWS__ ||

  // 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

  // Note that, as the name suggests, this strictly only supports file moves.

  return new Promise((resolve, reject) => {

        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

      // content should never change for any reason, so make it read-only

        !isWindows && chmod(dest, '0444')

      return pinflight('cacache-move-file:' + dest, () => {

        return stat(dest).catch((err) => {

            // Something else is wrong here. Bail bail bail

          // file doesn't already exist! let's try a rename -> copy fallback

          // only delete if it successfully copies

  "description": "Fast, fault-tolerant, cross-platform, disk-based, data-agnostic, content-addressable cache.",

    "benchmarks": "node test/benchmarks",

    "prepublishOnly": "git push --follow-tags",

    "test-docker": "docker run -it --rm --name pacotest -v \"$PWD\":/tmp -w /tmp node:latest npm test"

  "repository": "https://github.com/npm/cacache",

		@@ -8,3 +8,3 @@ 'use strict'
		const stat = util.promisify(fs.stat)
		const move = require('move-file')
		const move = require('@npmcli/move-file')
		const pinflight = require('promise-inflight')
		@@ -11,0 +11,0 @@

		{
		"name": "cacache",
		"version": "15.0.3",
		"version": "15.0.4",
		"cache-version": {
		@@ -61,2 +61,3 @@ "content": "2",
		"dependencies": {
		"@npmcli/move-file": "^1.0.1",
		"chownr": "^2.0.0",
		@@ -72,3 +73,2 @@ "fs-minipass": "^2.0.0",
		"mkdirp": "^1.0.3",
		"move-file": "^2.0.0",
		"p-map": "^4.0.0",
		@@ -75,0 +75,0 @@ "promise-inflight": "^1.0.1",

Worsened metrics

Dependency changes

		@@ -5,2 +5,9 @@ # Changelog

		### [15.0.4](https://github.com/npm/cacache/compare/v15.0.3...v15.0.4) (2020-06-03)


		### Bug Fixes

		* replace move-file dep with @npmcli/move-file ([bf88af0](https://github.com/npm/cacache/commit/bf88af04e50cca9b54041151139ffc1fd415e2dc)), closes [#37](https://github.com/npm/cacache/issues/37)

		### [15.0.3](https://github.com/npm/cacache/compare/v15.0.2...v15.0.3) (2020-04-28)
		@@ -7,0 +14,0 @@