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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2022 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/>.

;;; This file returns a manifest containing entries to build past Guix
;;; releases from the current Guix, as per 'guix time-machine'.

(use-modules (srfi srfi-9) (ice-9 match)
             (guix channels) (guix gexp)
             ((guix store) #:select (%store-monad))
             ((guix monads) #:select (mparameterize return))
             ((guix git) #:select (%repository-cache-directory))
             ((guix build utils) #:select (mkdir-p)))

;; Representation of the latest channels.  This type exists just so we can
;; refer to such records in a gexp.
(define-record-type <guix-instance>
  (guix-instance channels)
  guix-instance?
  (channels guix-instance-channels))

(define-gexp-compiler (guix-instance-compiler (instance <guix-instance>)
                                              system target)
  (match instance
    (($ <guix-instance> channels)
     ;; When this manifest is evaluated by Cuirass, make sure it does not
     ;; fiddle with the cached checkout that Cuirass is also using since
     ;; concurrent accesses are unsafe.
     (mparameterize %store-monad ((%repository-cache-directory
                                   (string-append (%repository-cache-directory)
                                                  "/time-travel/" system)))
       (return (mkdir-p (%repository-cache-directory)))
       (latest-channel-derivation channels)))))

(define (guix-instance->manifest-entry instance)
  "Return a manifest entry for INSTANCE."
  (define (shorten commit)
    (string-take commit 7))

  (manifest-entry
    (name "guix")
    (version (string-join (map (compose shorten channel-commit)
                               (guix-instance-channels instance))
                          "-"))
    (item instance)))

(define (commit->guix-instance commit)
  "Return a Guix instance for COMMIT."
  (guix-instance (list (channel
                        (inherit %default-guix-channel)
                        (commit commit)))))

(define %release-commits
  ;; Release commits: the list of version/commit pairs.
  '(("1.4.0" . "8e2f32cee982d42a79e53fc1e9aa7b8ff0514714")
    ("1.3.0" . "a0178d34f582b50e9bdbb0403943129ae5b560ff")

    ;; FIXME: To merely compute the derivation of these revisions, we need to
    ;; be able to build their dependencies.  However, pre-built binaries are
    ;; currently missing and some of these no longer build from source due to
    ;; time bombs like <https://issues.guix.gnu.org/58650>.  Thus, comment
    ;; them output until we have substitutes for these old things.

    ;; ("1.2.0" . "a099685659b4bfa6b3218f84953cbb7ff9e88063")
    ;; ("1.1.0" . "d62c9b2671be55ae0305bebfda17b595f33797f2")
    ;; ("1.0.1" . "d68de958b60426798ed62797ff7c96c327a672ac")
    ;; ("1.0.0" . "6298c3ffd9654d3231a6f25390b056483e8f407c")
    ;; ("0.16.0" . "4a0b87f0ec5b6c2dcf82b372dd20ca7ea6acdd9c")
    ))

(manifest
 (map (match-lambda
        ((version . commit)
         (let ((entry (guix-instance->manifest-entry
                       (commit->guix-instance commit))))
           (manifest-entry
             (inherit entry)
             (version version)))))
      %release-commits))
Smith 2021-04-12etc/committer: Use git plumbing instead of porcelain....* etc/committer.scm.in (diff-info): Use "git diff-files" instead of "git diff". (old-sexp): Use "git cat-file" instead of "git show". Signed-off-by: Ricardo Wurmus <rekado@elephly.net> Morgan Smith 2021-04-08etc/committer: Disable diff colors....Reported by: morgansmith on IRC. * etc/committer.scm.in (diff-info): Invoke "git diff" with "--no-color". Ricardo Wurmus 2021-04-08etc/committer: Recompute hunks before processing changes....* etc/committer.scm.in (main): Re-evaluate diff-info after processing insertions. Ricardo Wurmus 2021-04-08etc/committer: Record minimal context for hunks to avoid problems....With zero context new definitions would be applied to the wrong location in the file. More context lines lead to larger hunks, though, so we use just one line of context. * etc/committer.scm.in (diff-info): Invoke "git diff" with one line of context. [info]: Merge line break and first line. (lines-to-first-change): New procedure. (old-sexp, new-sexp): Use it. Ricardo Wurmus 2021-04-08etc/committer: Define delay duration as a variable....* etc/committer.scm.in (%delay): New variable. (main): Use it. Ricardo Wurmus 2021-04-08etc/committer: Handle package additions....* etc/committer.scm.in (<hunk>)[diff]: Rename this field... [diff-lines]: ...to this. [definition?]: New field. (hunk->patch): Join diff lines. (diff-info): Do not join diff lines; record whether a hunk is a new definition. (commit-message): Rename this procedure... (change-commit-message): ...to this. (add-commit-message): New procedure. (main): Handle new package definitions before changes. Ricardo Wurmus 2020-10-06etc: committer: Use EQUAL? instead of EQ? for differences....* etc/committer.scm.in (commit-message): Use EQUAL? instead of EQ? to compute differences because not all inputs may be symbols; some could be expressions. Ricardo Wurmus 2020-06-16etc: Add committer script....* etc/committer.scm.in: New file. * configure.ac: Configure it. Ricardo Wurmus