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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 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/>.
;;; 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 git-download)
(guix upstream)
(guix utils)
(guix base32)
(guix build utils)
(gnu packages package-management)
(ice-9 match))
(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 (main . args)
(match args
((commit version)
(with-store store
(let* ((source (add-to-store store
"guix-checkout" ;dummy name
#t "sha256" %top-srcdir
#:select? version-controlled?))
(hash (query-path-hash store source))
(location (package-definition-location))
(old-hash (origin-sha256 (package-source guix))))
(edit-expression location
(update-definition commit hash
#:old-hash old-hash
#:version version))
;; Re-add SOURCE to the store, but this time under the real name used
;; in the 'origin'. This allows us to build the package without
;; having to make a real checkout; thus, it also works when working
;; on a private branch.
(reload-module
(resolve-module '(gnu packages package-management)))
(let* ((source (add-to-store store
(origin-file-name (package-source guix))
#t "sha256" source))
(root (store-path-package-name source)))
;; Add an indirect GC root for SOURCE in the current directory.
(false-if-exception (delete-file root))
(symlink source root)
(add-indirect-root store root)
(format #t "source code for commit ~a: ~a (GC root: ~a)~%"
commit source root)))))
((commit)
;; Automatically deduce the version and revision numbers.
(main commit #f))))
(apply main (cdr (command-line)))
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