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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Ben Woodcroft <donttrustben@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix import github)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-34)
#:use-module (json)
#:use-module (guix utils)
#:use-module ((guix download) #:prefix download:)
#:use-module (guix import utils)
#:use-module (guix packages)
#:use-module (guix upstream)
#:use-module (guix http-client)
#:use-module (web uri)
#:export (%github-updater))
(define (json-fetch* url)
"Return a representation of the JSON resource URL (a list or hash table), or
#f if URL returns 404."
(guard (c ((and (http-get-error? c)
(= 404 (http-get-error-code c)))
#f)) ;"expected" if package is unknown
(let* ((port (http-fetch url))
(result (json->scm port)))
(close-port port)
result)))
(define (find-extension url)
"Return the extension of the archive e.g. '.tar.gz' given a URL, or
false if none is recognized"
(find (lambda (x) (string-suffix? x url))
(list ".tar.gz" ".tar.bz2" ".tar.xz" ".zip" ".tar" ".tgz" ".love")))
(define (updated-github-url old-package new-version)
;; Return a url for the OLD-PACKAGE with NEW-VERSION. If no source url in
;; the OLD-PACKAGE is a GitHub url, then return false.
(define (updated-url url)
(if (string-prefix? "https://github.com/" url)
(let ((ext (find-extension url))
(name (package-name old-package))
(version (package-version old-package))
(prefix (string-append "https://github.com/"
(github-user-slash-repository url)))
(repo (github-repository url)))
(cond
((string-suffix? (string-append "/tarball/v" version) url)
(string-append prefix "/tarball/v" new-version))
((string-suffix? (string-append "/tarball/" version) url)
(string-append prefix "/tarball/" new-version))
((string-suffix? (string-append "/archive/v" version ext) url)
(string-append prefix "/archive/v" new-version ext))
((string-suffix? (string-append "/archive/" version ext) url)
(string-append prefix "/archive/" new-version ext))
((string-suffix? (string-append "/archive/" name "-" version ext)
url)
(string-append prefix "/archive/" name "-" new-version ext))
((string-suffix? (string-append "/releases/download/v" version "/"
name "-" version ext)
url)
(string-append prefix "/releases/download/v" new-version "/" name
"-" new-version ext))
((string-suffix? (string-append "/releases/download/" version "/"
name "-" version ext)
url)
(string-append prefix "/releases/download/" new-version "/" name
"-" new-version ext))
((string-suffix? (string-append "/releases/download/" version "/"
repo "-" version ext)
url)
(string-append prefix "/releases/download/" new-version "/" repo
"-" new-version ext))
((string-suffix? (string-append "/releases/download/" repo "-"
version "/" repo "-" version ext)
url)
(string-append "/releases/download/" repo "-" version "/" repo "-"
version ext))
(#t #f))) ; Some URLs are not recognised.
#f))
(let ((source-url (and=> (package-source old-package) origin-uri))
(fetch-method (and=> (package-source old-package) origin-method)))
(if (eq? fetch-method download:url-fetch)
(match source-url
((? string?)
(updated-url source-url))
((source-url ...)
(find updated-url source-url)))
#f)))
(define (github-package? package)
"Return true if PACKAGE is a package from GitHub, else false."
(not (eq? #f (updated-github-url package "dummy"))))
(define (github-repository url)
"Return a string e.g. bedtools2 of the name of the repository, from a string
URL of the form 'https://github.com/arq5x/bedtools2/archive/v2.24.0.tar.gz'"
(match (string-split (uri-path (string->uri url)) #\/)
((_ owner project . rest)
(string-append project))))
(define (github-user-slash-repository url)
"Return a string e.g. arq5x/bedtools2 of the owner and the name of the
repository separated by a forward slash, from a string URL of the form
'https://github.com/arq5x/bedtools2/archive/v2.24.0.tar.gz'"
(match (string-split (uri-path (string->uri url)) #\/)
((_ owner project . rest)
(string-append owner "/" project))))
(define %github-token
;; Token to be passed to Github.com to avoid the 60-request per hour
;; limit, or #f.
(make-parameter (getenv "GUIX_GITHUB_TOKEN")))
(define (latest-released-version url package-name)
"Return a string of the newest released version name given a string URL like
'https://github.com/arq5x/bedtools2/archive/v2.24.0.tar.gz' and the name of
the package e.g. 'bedtools2'. Return #f if there is no releases"
(let* ((token (%github-token))
(api-url (string-append
"https://api.github.com/repos/"
(github-user-slash-repository url)
"/releases"))
(json (json-fetch*
(if token
(string-append api-url "?access_token=" token)
api-url))))
(if (eq? json #f)
(if token
(error "Error downloading release information through the GitHub
API when using a GitHub token")
(error "Error downloading release information through the GitHub
API. This may be fixed by using an access token and setting the environment
variable GUIX_GITHUB_TOKEN, for instance one procured from
https://github.com/settings/tokens"))
(let ((proper-releases
(filter
(lambda (x)
;; example pre-release:
;; https://github.com/wwood/OrfM/releases/tag/v0.5.1
;; or an all-prerelease set
;; https://github.com/powertab/powertabeditor/releases
(not (hash-ref x "prerelease")))
json)))
(match proper-releases
(() ;empty release list
#f)
((release . rest) ;one or more releases
(let ((tag (hash-ref release "tag_name"))
(name-length (string-length package-name)))
;; some tags include the name of the package e.g. "fdupes-1.51"
;; so remove these
(if (and (< name-length (string-length tag))
(string=? (string-append package-name "-")
(substring tag 0 (+ name-length 1))))
(substring tag (+ name-length 1))
;; some tags start with a "v" e.g. "v0.25.0"
;; where some are just the version number
(if (eq? (string-ref tag 0) #\v)
(substring tag 1) tag)))))))))
(define (latest-release pkg)
"Return an <upstream-source> for the latest release of PKG."
(let* ((source-uri (origin-uri (package-source pkg)))
(name (package-name pkg))
(newest-version (latest-released-version source-uri name)))
(if newest-version
(upstream-source
(package name)
(version newest-version)
(urls (list (updated-github-url pkg newest-version))))
#f))) ; On GitHub but no proper releases
(define %github-updater
(upstream-updater
(name 'github)
(description "Updater for GitHub packages")
(pred github-package?)
(latest latest-release)))