build: Require GNU libgcrypt.
* guix/utils.scm (sha256): Remove Coreutils- and libchop-based implementations. * README: Update accordingly. * m4/guix.m4: New file. * configure.ac: Use `GUIX_ASSERT_LIBGCRYPT_USABLE'. Set and substitute `LIBGCRYPT_PREFIX'. * Makefile.am (AM_DISTCHECK_CONFIGURE_FLAGS): Pass `--with-libgcrypt-prefix=$(LIBGCRYPT_PREFIX)'.
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Ludovic Courtès
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@ -172,4 +172,5 @@ EXTRA_DIST += doc/fdl-1.3.texi
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ACLOCAL_AMFLAGS = -I m4
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AM_DISTCHECK_CONFIGURE_FLAGS = \
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--with-libgcrypt-prefix="$(LIBGCRYPT_PREFIX)" \
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--with-nix-prefix="$(NIX_PREFIX)"
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2
README
2
README
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@ -17,7 +17,7 @@ Guix currently depends on the following packages:
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- [[http://gnu.org/software/guile/][GNU Guile 2.0.x]]
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- [[http://nixos.org/nix/][Nix]]
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- [[http://gnupg.org/][GNU libgcrypt]], or [[http://nongnu.org/libchop/][libchop]]
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- [[http://gnupg.org/][GNU libgcrypt]]
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Optionally, packages from Nixpkgs may be transparently reused from Guix.
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For this to work, you need to have a checkout of the Nixpkgs repository;
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@ -65,9 +65,11 @@ AC_ARG_WITH([libgcrypt-prefix],
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[case "$withval" in
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yes|no)
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LIBGCRYPT="libgcrypt"
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LIBGCRYPT_PREFIX="no"
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;;
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*)
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LIBGCRYPT="$withval/lib/libgcrypt"
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LIBGCRYPT_PREFIX="$withval"
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;;
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esac],
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[LIBGCRYPT="libgcrypt"])
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@ -76,6 +78,10 @@ dnl Library name suitable for `dynamic-link'.
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AC_MSG_CHECKING([for libgcrypt shared library name])
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AC_MSG_RESULT([$LIBGCRYPT])
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AC_SUBST([LIBGCRYPT])
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AC_SUBST([LIBGCRYPT_PREFIX])
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GUIX_ASSERT_LIBGCRYPT_USABLE
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AC_CONFIG_FILES([Makefile
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po/Makefile.in
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@ -394,58 +394,17 @@ starting from the right of S."
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;;;
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(define sha256
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(cond
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((compile-time-value
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(false-if-exception (dynamic-link %libgcrypt)))
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;; Using libgcrypt.
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(let ((hash (pointer->procedure void
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(dynamic-func "gcry_md_hash_buffer"
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(dynamic-link %libgcrypt))
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`(,int * * ,size_t)))
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(sha256 8)) ; GCRY_MD_SHA256, as of 1.5.0
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(lambda (bv)
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"Return the SHA256 of BV as a bytevector."
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(let ((digest (make-bytevector (/ 256 8))))
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(hash sha256 (bytevector->pointer digest)
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(bytevector->pointer bv) (bytevector-length bv))
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digest))))
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((compile-time-value
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(false-if-exception (resolve-interface '(chop hash))))
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;; Using libchop.
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(let ((bytevector-hash (@ (chop hash) bytevector-hash))
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(hash-method/sha256 (@ (chop hash) hash-method/sha256)))
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(lambda (bv)
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"Return the SHA256 of BV as a bytevector."
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(bytevector-hash hash-method/sha256 bv))))
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(else
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;; Slow, poor programmer's implementation that uses Coreutils.
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(let ((hash (pointer->procedure void
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(dynamic-func "gcry_md_hash_buffer"
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(dynamic-link %libgcrypt))
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`(,int * * ,size_t)))
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(sha256 8)) ; GCRY_MD_SHA256, as of 1.5.0
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(lambda (bv)
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"Return the SHA256 of BV as a bytevector."
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(let ((in (pipe))
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(out (pipe))
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(pid (primitive-fork)))
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(if (= 0 pid)
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(begin ; child
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(close (cdr in))
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(close (car out))
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(close 0)
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(close 1)
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(dup2 (fileno (car in)) 0)
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(dup2 (fileno (cdr out)) 1)
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(execlp "sha256sum" "sha256sum"))
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(begin ; parent
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(close (car in))
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(close (cdr out))
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(put-bytevector (cdr in) bv)
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(close (cdr in)) ; EOF
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(let ((line (car (string-tokenize (read-line (car out))))))
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(close (car out))
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(and (and=> (status:exit-val (cdr (waitpid pid)))
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zero?)
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(base16-string->bytevector line))))))))))
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(let ((digest (make-bytevector (/ 256 8))))
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(hash sha256 (bytevector->pointer digest)
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(bytevector->pointer bv) (bytevector-length bv))
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digest))))
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;;;
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@ -0,0 +1,35 @@
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dnl Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
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dnl Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
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dnl
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dnl This file is part of Guix.
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dnl
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dnl Guix is free software; you can redistribute it and/or modify it
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dnl under the terms of the GNU General Public License as published by
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dnl the Free Software Foundation; either version 3 of the License, or (at
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dnl your option) any later version.
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dnl
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dnl Guix is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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dnl GNU General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU General Public License
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dnl along with Guix. If not, see <http://www.gnu.org/licenses/>.
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dnl GUIX_ASSERT_LIBGCRYPT_USABLE
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dnl
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dnl Assert that GNU libgcrypt is usable from Guile.
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AC_DEFUN([GUIX_ASSERT_LIBGCRYPT_USABLE],
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[AC_CACHE_CHECK([whether $LIBGCRYPT can be dynamically loaded],
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[guix_cv_libgcrypt_usable_p],
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[GUILE_CHECK([retval],
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[(dynamic-func \"gcry_md_hash_buffer\" (dynamic-link \"$LIBGCRYPT\"))])
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if test "$retval" = 0; then
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guix_cv_libgcrypt_usable_p="yes"
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else
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guix_cv_libgcrypt_usable_p="no"
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fi])
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if test "x$guix_cv_libgcrypt_usable_p" != "xyes"; then
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AC_MSG_ERROR([GNU libgcrypt does not appear to be usable; see `--with-libgcrypt-prefix' and `README'.])
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fi])
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