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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)))
+ (pk source
+ (add-to-store store
+ (origin-file-name (package-source guix))
+ #t "sha256" source)))))
+ ((commit)
+ ;; Automatically deduce the version and revision numbers.
+ (main commit #f))))
+
+(apply main (cdr (command-line)))