147 lines
5.6 KiB
Scheme
147 lines
5.6 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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;;;
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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 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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(gnu packages package-management)
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(ice-9 match))
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(define %top-srcdir
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(string-append (current-source-directory) "/.."))
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(define version-controlled?
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(git-predicate %top-srcdir))
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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 (main . args)
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(match args
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((commit version)
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(with-store store
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(let* ((source (add-to-store store
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"guix-checkout" ;dummy name
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#t "sha256" %top-srcdir
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#:select? version-controlled?))
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(hash (query-path-hash store source))
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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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;; Re-add SOURCE to the store, but this time under the real name used
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;; in the 'origin'. This allows us to build the package without
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;; having to make a real checkout; thus, it also works when working
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;; 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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(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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(format #t "source code for commit ~a: ~a (GC root: ~a)~%"
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commit source root)))))
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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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