55 lines
2.3 KiB
Scheme
55 lines
2.3 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2021 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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(define-module (guix build pack)
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#:use-module (guix build utils)
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#:export (tar-base-options))
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(define* (tar-base-options #:key tar compressor)
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"Return the base GNU tar options required to produce deterministic archives
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deterministically. When TAR, a GNU tar command file name, is provided, the
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`--sort' option is used only if supported. When COMPRESSOR, a command such as
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'(\"gzip\" \"-9n\"), is provided, the compressor is explicitly specified via
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the `-I' option."
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(define (tar-supports-sort? tar)
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(with-error-to-port (%make-void-port "w")
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(lambda ()
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(zero? (system* tar "cf" "/dev/null" "--files-from=/dev/null"
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"--sort=name")))))
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`(,@(if compressor
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(list "-I" (string-join compressor))
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'())
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;; The --sort option was added to GNU tar in version 1.28, released
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;; 2014-07-28. For testing, we use the bootstrap tar, which is older
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;; and doesn't support it.
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,@(if (and=> tar tar-supports-sort?)
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'("--sort=name")
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'())
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;; Use GNU format so there's no file name length limitation.
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"--format=gnu"
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"--mtime=@1"
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"--owner=root:0"
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"--group=root:0"
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;; The 'nlink' of the store item files leads tar to store hard links
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;; instead of actual copies. However, the 'nlink' count depends on
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;; deduplication in the store; it's an "implicit input" to the build
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;; process. Use '--hard-dereference' to eliminate it.
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"--hard-dereference"
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"--check-links"))
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