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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@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/>.
;;; Commentary:
;;;
;;; This scripts updates the definition of the 'guix' package in Guix for the
;;; current commit. It requires Git to be installed.
;;;
;;; Code:
(use-modules (guix)
(guix ui)
(guix git-download)
(guix upstream)
(guix utils)
(guix base32)
(guix build utils)
(guix scripts hash)
(gnu packages package-management)
(ice-9 match)
(ice-9 popen)
(ice-9 regex)
(ice-9 textual-ports)
(srfi srfi-1)
(srfi srfi-2)
(srfi srfi-26))
(define %top-srcdir
(string-append (current-source-directory) "/.."))
(define version-controlled?
(git-predicate %top-srcdir))
(define (package-definition-location)
"Return the source properties of the definition of the 'guix' package."
(call-with-input-file (location-file (package-location guix))
(lambda (port)
(let loop ()
(match (read port)
((? eof-object?)
(error "definition of 'guix' package could not be found"
(port-filename port)))
(('define-public 'guix value)
(source-properties value))
(_
(loop)))))))
(define* (update-definition commit hash
#:key version old-hash)
"Return a one-argument procedure that takes a string, the definition of the
'guix' package, and returns a string, the update definition for VERSION,
COMMIT."
(define (linear-offset str line column)
;; Return the offset in characters to reach LINE and COLUMN (both
;; zero-indexed) in STR.
(call-with-input-string str
(lambda (port)
(let loop ((offset 0))
(cond ((and (= (port-column port) column)
(= (port-line port) line))
offset)
((eof-object? (read-char port))
(error "line and column not reached!"
str))
(else
(loop (+ 1 offset))))))))
(define (update-hash str)
;; Replace OLD-HASH with HASH in STR.
(string-replace-substring str
(bytevector->nix-base32-string old-hash)
(bytevector->nix-base32-string hash)))
(lambda (str)
(match (call-with-input-string str read)
(('let (('version old-version)
('commit old-commit)
('revision old-revision))
defn)
(let* ((location (source-properties defn))
(line (assq-ref location 'line))
(column 0)
(offset (linear-offset str line column)))
(string-append (format #f "(let ((version \"~a\")
(commit \"~a\")
(revision ~a))\n"
(or version old-version)
commit
(if (and version
(not (string=? version old-version)))
0
(+ 1 old-revision)))
(string-drop (update-hash str) offset))))
(exp
(error "'guix' package definition is not as expected" exp)))))
(define (git-add-worktree directory commit)
"Create a new git worktree at DIRECTORY, detached on commit COMMIT."
(invoke "git" "worktree" "add" "--detach" directory commit))
(define-syntax-rule (with-temporary-git-worktree commit body ...)
"Execute BODY in the context of a temporary git worktree created from COMMIT."
(call-with-temporary-directory
(lambda (tmp-directory)
(dynamic-wind
(lambda ()
#t)
(lambda ()
(git-add-worktree tmp-directory commit)
(with-directory-excursion tmp-directory body ...))
(lambda ()
(invoke "git" "worktree" "remove" "--force" tmp-directory))))))
(define %savannah-guix-git-repo-push-url-regexp
"git.(savannah|sv).gnu.org/srv/git/guix.git \\(push\\)")
(define-syntax-rule (with-input-pipe-to-string prog arg ...)
(let* ((input-pipe (open-pipe* OPEN_READ prog arg ...))
(output (get-string-all input-pipe))
(exit-val (status:exit-val (close-pipe input-pipe))))
(unless (zero? exit-val)
(error (format #f "Command ~s exited with non-zero exit status: ~s"
(string-join (list prog arg ...)) exit-val)))
(string-trim-both output)))
(define (find-origin-remote)
"Find the name of the git remote with the Savannah Guix git repo URL."
(and-let* ((remotes (string-split (with-input-pipe-to-string
"git" "remote" "-v")
#\newline))
(origin-entry (find (cut string-match
%savannah-guix-git-repo-push-url-regexp
<>)
remotes)))
(first (string-split origin-entry #\tab))))
(define (commit-already-pushed? remote commit)
"True if COMMIT is found in the REMOTE repository."
(not (string-null? (with-input-pipe-to-string
"git" "branch" "-r" "--contains" commit
(string-append remote "/master")))))
(define (main . args)
(match args
((commit version)
(with-directory-excursion %top-srcdir
(or (getenv "GUIX_ALLOW_ME_TO_USE_PRIVATE_COMMIT")
(commit-already-pushed? (find-origin-remote) commit)
(leave (G_ "Commit ~a is not pushed upstream. Aborting.~%") commit))
(let* ((hash (with-temporary-git-worktree commit
(nix-base32-string->bytevector
(string-trim-both
(with-output-to-string
(lambda ()
(guix-hash "-rx" ".")))))))
(location (package-definition-location))
(old-hash (content-hash-value
(origin-hash (package-source guix)))))
(edit-expression location
(update-definition commit hash
#:old-hash old-hash
#:version version)))))
((commit)
;; Automatically deduce the version and revision numbers.
(main commit #f))))
(apply main (cdr (command-line)))
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