216 lines
8.5 KiB
Scheme
216 lines
8.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017, 2018 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;;
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;;; This scripts updates the definition of the 'guix' package in Guix for the
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;;; current commit. It requires Git to be installed.
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;;;
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;;; Code:
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(use-modules (guix)
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(guix ui)
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(guix git-download)
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(guix upstream)
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(guix utils)
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(guix base32)
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(guix build utils)
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(guix scripts hash)
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(gnu packages package-management)
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(ice-9 match)
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(ice-9 popen)
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(ice-9 regex)
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(ice-9 textual-ports)
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(srfi srfi-1)
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(srfi srfi-2)
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(srfi srfi-26))
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(define %top-srcdir
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(string-append (current-source-directory) "/.."))
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(define (package-definition-location)
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"Return the source properties of the definition of the 'guix' package."
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(call-with-input-file (location-file (package-location guix))
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(lambda (port)
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(let loop ()
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(match (read port)
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((? eof-object?)
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(error "definition of 'guix' package could not be found"
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(port-filename port)))
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(('define-public 'guix value)
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(source-properties value))
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(_
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(loop)))))))
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(define* (update-definition commit hash
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#:key version old-hash)
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"Return a one-argument procedure that takes a string, the definition of the
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'guix' package, and returns a string, the update definition for VERSION,
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COMMIT."
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(define (linear-offset str line column)
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;; Return the offset in characters to reach LINE and COLUMN (both
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;; zero-indexed) in STR.
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(call-with-input-string str
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(lambda (port)
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(let loop ((offset 0))
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(cond ((and (= (port-column port) column)
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(= (port-line port) line))
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offset)
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((eof-object? (read-char port))
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(error "line and column not reached!"
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str))
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(else
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(loop (+ 1 offset))))))))
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(define (update-hash str)
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;; Replace OLD-HASH with HASH in STR.
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(string-replace-substring str
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(bytevector->nix-base32-string old-hash)
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(bytevector->nix-base32-string hash)))
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(lambda (str)
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(match (call-with-input-string str read)
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(('let (('version old-version)
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('commit old-commit)
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('revision old-revision))
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defn)
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(let* ((location (source-properties defn))
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(line (assq-ref location 'line))
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(column 0)
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(offset (linear-offset str line column)))
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(string-append (format #f "(let ((version \"~a\")
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(commit \"~a\")
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(revision ~a))\n"
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(or version old-version)
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commit
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(if (and version
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(not (string=? version old-version)))
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0
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(+ 1 old-revision)))
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(string-drop (update-hash str) offset))))
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(exp
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(error "'guix' package definition is not as expected" exp)))))
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(define (git-add-worktree directory commit)
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"Create a new git worktree at DIRECTORY, detached on commit COMMIT."
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(invoke "git" "worktree" "add" "--detach" directory commit))
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(define (call-with-temporary-git-worktree commit proc)
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"Execute PROC in the context of a temporary git worktree created from
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COMMIT. PROC receives the temporary directory file name as an argument."
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(call-with-temporary-directory
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(lambda (tmp-directory)
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(dynamic-wind
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(lambda ()
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#t)
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(lambda ()
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(git-add-worktree tmp-directory commit)
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(proc tmp-directory))
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(lambda ()
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(invoke "git" "worktree" "remove" "--force" tmp-directory))))))
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(define %savannah-guix-git-repo-push-url-regexp
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"git.(savannah|sv).gnu.org:?/srv/git/guix.git \\(push\\)")
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(define-syntax-rule (with-input-pipe-to-string prog arg ...)
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(let* ((input-pipe (open-pipe* OPEN_READ prog arg ...))
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(output (get-string-all input-pipe))
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(exit-val (status:exit-val (close-pipe input-pipe))))
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(unless (zero? exit-val)
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(error (format #f "Command ~s exited with non-zero exit status: ~s"
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(string-join (list prog arg ...)) exit-val)))
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(string-trim-both output)))
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(define (find-origin-remote)
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"Find the name of the git remote with the Savannah Guix git repo URL."
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(and-let* ((remotes (string-split (with-input-pipe-to-string
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"git" "remote" "-v")
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#\newline))
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(origin-entry (find (cut string-match
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%savannah-guix-git-repo-push-url-regexp
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<>)
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remotes)))
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(first (string-split origin-entry #\tab))))
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(define (commit-already-pushed? remote commit)
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"True if COMMIT is found in the REMOTE repository."
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(not (string-null? (with-input-pipe-to-string
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"git" "branch" "-r" "--contains" commit
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(string-append remote "/master")))))
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(define (keep-source-in-store store source)
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"Add SOURCE to the store under the name that the 'guix' package expects."
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;; Add SOURCE to the store, but this time under the real name used in the
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;; 'origin'. This allows us to build the package without having to make a
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;; real checkout; thus, it also works when working on a private branch.
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(reload-module
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(resolve-module '(gnu packages package-management)))
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(let* ((source (add-to-store store
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(origin-file-name (package-source guix))
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#t "sha256" source
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#:select? (git-predicate source)))
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(root (store-path-package-name source)))
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;; Add an indirect GC root for SOURCE in the current directory.
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(false-if-exception (delete-file root))
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(symlink source root)
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(add-indirect-root store
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(string-append (getcwd) "/" root))
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(info (G_ "source code kept in ~a (GC root: ~a)~%")
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source root)))
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(define (main . args)
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(match args
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((commit version)
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(with-directory-excursion %top-srcdir
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(or (getenv "GUIX_ALLOW_ME_TO_USE_PRIVATE_COMMIT")
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(let ((remote (find-origin-remote)))
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(unless remote
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(leave (G_ "Failed to find the origin git remote.~%")))
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(commit-already-pushed? remote commit))
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(leave (G_ "Commit ~a is not pushed upstream. Aborting.~%") commit))
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(call-with-temporary-git-worktree commit
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(lambda (tmp-directory)
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(let* ((hash (nix-base32-string->bytevector
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(string-trim-both
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(with-output-to-string
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(lambda ()
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(guix-hash "-rx" tmp-directory))))))
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(location (package-definition-location))
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(old-hash (content-hash-value
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(origin-hash (package-source guix)))))
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(edit-expression location
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(update-definition commit hash
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#:old-hash old-hash
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#:version version))
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;; When GUIX_ALLOW_ME_TO_USE_PRIVATE_COMMIT is set, the sources are
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;; added to the store. This is used as part of 'make release'.
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(when (getenv "GUIX_ALLOW_ME_TO_USE_PRIVATE_COMMIT")
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(with-store store
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(keep-source-in-store store tmp-directory))))))))
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((commit)
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;; Automatically deduce the version and revision numbers.
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(main commit #f))))
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(apply main (cdr (command-line)))
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