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ROADMAP.md

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Patchify roadmap

Version 0.1.0

Server

  • Configuration
    • Name of application, to use with binary release files
    • Location of released binaries
    • List of versions, with corresponding hashes
    • Private key to use for signing
    • On start-up, sort the available versions in a manner that is sympathetic to version numbering, to determine the latest
  • API endpoints
    • Latest version number
      • GET /latest
      • Provide the latest version number with signature
    • Releases
      • GET /releases/:version
      • Provide the release binary for download
    • Verification information
      • GET /hashes/:version
      • Confirm the authenticity of the binary by providing a SHA256 hash with signature
  • Security
    • Private key will be used to provide a signature to the version number and SHA256 hash
  • Errors and logging
    • Log all errors
    • Log all requests
    • Check versions against provided binaries upon start-up
      • Exit with an error if there are any missing, or if any hashes don’t match
  • Tests
  • Documentation

Client

  • Configuration
    • The version of the application
    • Where to look for updates — hostname plus basepath of API
    • How often to check for updates
      • Every time the application starts
      • Every X interval of time
    • Public key to use for verifying provided information
  • Status
    • Critical actions counter, with methods to increment and decrement
    • Central status enum — update at each stage
    • Method to check if an update has been started
    • Only start new critical actions if the status allows it
  • Check for updates
    • Query the server at intervals
      • Check no upgrade is currently in progress
      • Check response against version in use
      • Use the public key to verify the legitimacy of the provided information
  • Perform the update
    • Make update status information available
      • Update central status enum at each stage
      • Broadcast the status updates to interested subscribers
    • Download the new binary
      • Save into a tmpdir — this will be auto-cleaned when the application exits
      • Provide information about the download progress
    • Verify the correctness of the downloaded binary
      • Run a SHA256 hash and compare with the published hash
      • Use the public key to verify the legitimacy of the provided information
    • Replace the installed application binary
    • Shut down the current application activity
      • Update the central status to indicate that an upgrade is underway
      • Wait until the critical actions counter has reached zero, then trigger the restart
    • Start the new version
    • Exit the old version
  • Errors and logging
    • Log all attempts and their results
    • Log any issues such as failed verification of signed data
  • Tests
  • Documentation

Version 0.2.0

Server

  • Tracking
    • Accept the versions of the applications making the requests
    • Log the versions making the requests
    • Differentiate which requests come from which active installations
  • Progress updates
    • Progress updates for these areas:
      • Initial release checking
    • Configuration for how often to send an update (duration-based, or every time there’s an update)

Client

  • Auto-restart / manual control
    • Make auto-restart optional
    • Make the restart method public
    • Make the update check public, for manual triggering
    • Allow asking the user for permission to restart, for interactive applications
  • Tracking
    • Send details of the version in use
    • Notify when updated successfully
    • Notify when update failed
  • Progress updates
    • Progress updates for these areas:
      • Download
      • Verify
      • Copy (install)
      • Critical actions remaining
    • Configuration for how often to send an update (duration-based, or every time there’s an update)
  • Error behaviour
    • Retry or not
    • Retry N times before dropping to slower interval

Future versions

Server

  • Enhanced HTTP support
    • Support for range requests, allowing partial transfers
    • Support for resuming downloads
    • Support for segment hashing of files to allow for partial verification and resuming of downloads
    • Support HTTP compression
    • Support rate-limiting of requests
  • Version management
    • Dynamic list of versions — with database support
    • Ranges of compatibility, e.g. getting the latest compatible version under semver rules
    • Version yanking
    • Support for patches, i.e. partial file changes
    • Support for different types of binary, e.g. Windows, Linux, Mac
    • Support for different architectures, e.g. x86, x86_64, ARM
    • Support for different release channels, e.g. stable, beta, nightly
    • Support for different release formats, e.g. tarball, zip, deb, rpm

Client

  • Windows compatibility
    • Replace the installed application binary
  • Upgrade failure detection
    • Check that the new version has started correctly
    • Roll back to the previous version if the new version fails to start
    • Check rollback status
    • Notify when rollback is successful
  • Extended data
    • Support binaries and update info coming from separate places
  • Version management
    • Support downgrading
    • Support skipping versions
    • Support pinning versions
  • Complex installations
    • Support more nuanced or complex permissions setups for updating and restarting the application