#!/bin/sh
# GNU Guix --- Functional package management for GNU
# Copyright © 2012, 2013, 2014 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/>.

#
# Update the local copy of Nix source code needed to build the daemon.
# Assume GNU Coreutils and Git are available.
#

top_srcdir="${top_srcdir:-..}"

log()
{
    echo "sync-with-upstream: $@" >&2
}

# checked_in_p FILE
checked_in_p()
{
    ( cd "$top_srcdir" ;
	git ls-tree HEAD -- "nix/$1" | grep "$1" > /dev/null )
}

if [ ! -d "$top_srcdir/build-aux" ]
then
    log "\`$top_srcdir' is not the valid top-level source directory"
    exit 1
fi

set -e
for upstream_file in `cd "$top_srcdir/nix-upstream/src" ;
  find . -name \*.c -or -name \*.h -or -name \*.cc -or -name \*.hh \
         -or -name \*.cpp -or -name \*.hpp -or -name \*.sql`
do
    if grep "$upstream_file" "$top_srcdir/daemon.am" > /dev/null
    then
    	if checked_in_p "$upstream_file"
    	then
    	    log "skipping \`$upstream_file', which has a checked-in copy"
    	else
    	    ( cd "$top_srcdir/nix-upstream/src" && \
    		cp -v --parents "$upstream_file" ../../nix )
    	fi
    else
    	log "skipping \`$upstream_file', which is not used"
    fi
done

# This file should be generated by our build system so remove it.
rm -fv "$top_srcdir/nix/libstore/schema.sql.hh"

cp -v "$top_srcdir/nix-upstream/COPYING" "$top_srcdir/nix"

# Generate an 'AUTHORS' file since upstream Nix no longer has one.
cat > "$top_srcdir/nix/AUTHORS" <<EOF
Most of the code is this directory was written by the following people for
the Nix project (http://nixos.org/nix).  Thank you!

EOF
( cd "$top_srcdir/nix-upstream" ; git shortlog --summary )	\
    | sed -'es/^ *[0-9]\+\(.*\)/   \1/g'			\
    >> "$top_srcdir/nix/AUTHORS"

# Substitutions.
sed -i "$top_srcdir/nix/libstore/gc.cc"					\
    -e 's|/nix/find-runtime-roots\.pl|/guix/list-runtime-roots|g'

# Our 'guix_hash_context' structure has a copy constructor, specifically to
# handle the use case in 'HashSink::currentHash()' where the copy of the
# context is expected to truly copy the underlying hash context.  The copy
# constructor cannot be used in 'Ctx' if that's a union, so turn it into a
# structure (we can afford to two wasted words.)
sed -i "$top_srcdir/nix/libutil/hash.cc" "$top_srcdir/nix/libutil/hash.hh" \
    -e 's|union Ctx|struct Ctx|g'