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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Ben Woodcroft <donttrustben@gmail.com>
;;; Copyright © 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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-26)
#:use-module (srfi srfi-34)
#:use-module (guix utils)
#:use-module ((guix download) #:prefix download:)
#:use-module (guix import utils)
#:use-module (guix import json)
#:use-module (guix packages)
#:use-module (guix upstream)
#:use-module (guix http-client)
#:use-module (web uri)
#:export (%github-updater))
(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" ".tbz" ".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 (or (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 (fetch-releases-or-tags url)
"Fetch the list of \"releases\" or, if it's empty, the list of tags for the
repository at URL. Return the corresponding JSON dictionaries (hash tables),
or #f if the information could not be retrieved.
We look at both /releases and /tags because the \"release\" feature of GitHub
is little used; often, people simply provide a tag. What's confusing is that
tags show up in the \"Releases\" tab of the web UI. For instance,
'https://github.com/aconchillo/guile-json/releases' shows a number of
\"releases\" (really: tags), whereas
'https://api.github.com/repos/aconchillo/guile-json/releases' returns the
empty list."
(define release-url
(string-append "https://api.github.com/repos/"
(github-user-slash-repository url)
"/releases"))
(define tag-url
(string-append "https://api.github.com/repos/"
(github-user-slash-repository url)
"/tags"))
(define headers
;; Ask for version 3 of the API as suggested at
;; <https://developer.github.com/v3/>.
`((Accept . "application/vnd.github.v3+json")
(user-agent . "GNU Guile")))
(define (decorate url)
(if (%github-token)
(string-append url "?access_token=" (%github-token))
url))
(match (json-fetch (decorate release-url) #:headers headers)
(()
;; We got the empty list, presumably because the user didn't use GitHub's
;; "release" mechanism, but hopefully they did use Git tags.
(json-fetch (decorate tag-url) #:headers headers))
(x x)))
(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* ((json (fetch-releases-or-tags url)))
(if (eq? json #f)
(if (%github-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 loop ((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 releases
(() ;empty release list
#f)
((release . rest) ;one or more releases
(let ((tag (or (hash-ref release "tag_name") ;a "release"
(hash-ref release "name"))) ;a tag
(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 (string-prefix? "v" tag)
(substring tag 1)
;; Finally, reject tags that don't start with a digit:
;; they may not represent a release.
(if (and (not (string-null? tag))
(char-set-contains? char-set:digit
(string-ref tag 0)))
tag
(loop rest)))))))))))
(define (latest-release pkg)
"Return an <upstream-source> for the latest release of PKG."
(define (origin-github-uri origin)
(match (origin-uri origin)
((? string? url)
url) ;surely a github.com URL
((urls ...)
(find (cut string-contains <> "github.com") urls))))
(let* ((source-uri (origin-github-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)))