#!/bin/bash
#   pbuilder -- personal Debian package builder
#   Copyright (C) 2001,2002,2003,2005-2007 Junichi Uekawa
#
#   This program 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 2 of the License, or
#   (at your option) any later version.
#
#   This program 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 this program; if not, write to the Free Software
#   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
#
# module to satisfy build dependencies; default flavor

# The original pbuilder-satisfydepends code, which is now called 'classic'

set -e

export PBUILDER_PKGLIBDIR="${PBUILDER_PKGLIBDIR:-$PBUILDER_ROOT/usr/lib/pbuilder}"

. "$PBUILDER_PKGLIBDIR"/pbuilder-satisfydepends-funcs

# splits lines of deps (possibly with alternates) separated by commas into one
# dep (possibly with alternates) per line; also changes all spaces to slashes
# first as to iterate on deps with "for"; e.g. "foo, bar | baz", "foobar (>=
# 2)"  becomes "foo", "bar/|/baz", "foobar/(>=/2)"
split_deps() {
    sed 's#, *#\n#g; s# #/#g'
}
# and build-conflicts

# splits build-dep with alternates into one alternate per line; e.g. "foo|bar"
# becomes "foo", "bar"
split_alternates() {
    echo "$*" | sed 's/ *| */\n/g'
}

# filters package name out of a "/" escaped simple build-dep, possibly with
# architecture or version specifier; e.g. "/foo/(>=/2)/[i386/amd64]" becomes
# "foo"
get_pkg_name() {
    echo "$*" | sed 's#^/*##; s#[[/(].*##'
}

# filter operator and version of a "/" escaped versioned build-dep; e.g.
# "foo/(>=/2)" becomes ">= 2"
get_dep_op_and_ver() {
    echo "$*" | sed -n 's#/# #g; s/.*( *\(<<\|<=\|>=\|=\|<\|>>\|>\) *\([^ )]*\) *).*/\1 \2/p'
}

# call apt-get in chroot in simulate mode
apt_sim() {
    $CHROOTEXEC /usr/bin/apt-get -s install "$@"
}

# Use this function to fulfill the dependency (almost)
checkbuilddep_internal() {
    local ARCH=$($CHROOTEXEC dpkg-architecture -qDEB_HOST_ARCH)
    local INSTALLPKG
    local INSTALLPKGLIST
    local INSTALLPKGMULTI
    local CURRENTREALPKGNAME
    local SATISFIED
    local APTFLAG="-o APT::Install-Recommends=false"
    echo " -> Attempting to parse the build-deps "
    for INSTALLPKGMULTI in $(get_build_deps | split_deps); do
      echo " -> Considering build-dep $(echo "$INSTALLPKGMULTI" | tr "/" " ")"
      SATISFIED="no"
      for INSTALLPKG in $(split_alternates "$INSTALLPKGMULTI"); do
	CURRENTREALPKGNAME=$(get_pkg_name "$INSTALLPKG")
	if echo "$INSTALLPKG" | grep -q '\['; then
	    if checkbuilddep_archdeps "$INSTALLPKG" "$ARCH"; then
		SATISFIED="yes"
		echo "   -> This package is not for this architecture"
		continue
	    fi
	fi
	if echo "$INSTALLPKG" | grep -q '('; then
	    #echo "Debug: $INSTALLPKG"
	    if ! checkbuilddep_versiondeps "$CURRENTREALPKGNAME" `get_dep_op_and_ver "$INSTALLPKG"`; then
	      echo "   -> Does not satisfy version, not trying"
	      continue
	    fi
	fi
	echo "   -> Trying $CURRENTREALPKGNAME"

	if apt_sim $APTFLAG $INSTALLPKGLIST $CURRENTREALPKGNAME >& /dev/null; then
	    SATISFIED="yes"
	    INSTALLPKGLIST="$INSTALLPKGLIST $CURRENTREALPKGNAME"
	else
	    echo "       -> Cannot install $CURRENTREALPKGNAME; apt errors follow:"
	    if apt_sim $APTFLAG $INSTALLPKGLIST "$CURRENTREALPKGNAME"; then
		:
	    fi
	    # package could not be found. -- looking for alternative.
	    PROVIDED=""
	    checkbuilddep_provides "$CURRENTREALPKGNAME"
	    if [ -n "$PROVIDED" ]; then
		# something provides this package
		echo "     -> Considering $PROVIDED to satisfy the dependency "
		if apt_sim $APTFLAG $INSTALLPKGLIST $PROVIDED >& /dev/null; then
		    SATISFIED="yes";
		    INSTALLPKGLIST="$INSTALLPKGLIST $PROVIDED"
		else
		    # show the error for diagnostic purposes
		    echo "       -> Cannot install $PROVIDED; apt errors follow:"
		    apt_sim $APTFLAG $INSTALLPKGLIST $PROVIDED || true
		fi
	    fi
	fi
	if [ "$SATISFIED" = "yes" ]; then
	    break;
	fi
      done;
      if [ "$SATISFIED" = "no" ]; then
	  echo "E: Could not satisfy build-dependency." >&2
	  if [ "$CONTINUE_FAIL" != "yes" ]; then
	      exit 2
	  fi
      fi
    done;
    
    # now actually install the packages
    echo " -> Installing $INSTALLPKGLIST"
    if ! $CHROOTEXEC apt-get -y "${APTGETOPT[@]}" install $APTFLAG $INSTALLPKGLIST; then
	echo " -> Trying to fix apt error"
	# Work around an apt bug which causes configure to fail.
	if $CHROOTEXEC dpkg --configure --pending && $CHROOTEXEC apt-get -y "${APTGETOPT[@]}" install $APTFLAG $INSTALLPKGLIST; then
	    echo " -> Apt bug workaround succeeded"
	elif [ "$CONTINUE_FAIL" != "yes" ]; then
	    echo "E: Unrecoverable error installing build-dependencies." >&2
	    exit 1
	fi
    fi

    # start processing build-conflicts.
    for INSTALLPKG in $(get_build_conflicts | split_deps); do
      CURRENTREALPKGNAME=$(get_pkg_name "$INSTALLPKG")
      echo " -> Considering $CURRENTREALPKGNAME"
      
      if echo "$INSTALLPKG" | grep -q '\['; then
	  # this package has arch-conflicts.
	  if checkbuilddep_archdeps "$INSTALLPKG" "$ARCH"; then
	      echo "I: Ignoring other-arch"
	      continue
	  fi
      fi
      if echo "$INSTALLPKG" | grep -q '('; then
	  # this package has version-conflicts
	  if ! checkbuilddep_versiondeps "$CURRENTREALPKGNAME" `get_dep_op_and_ver "$INSTALLPKG"`; then
	      echo "I: Satisfies version, not trying"
	      continue
	  fi
      fi

      # if package exists, remove it.
      if $CHROOTEXEC /usr/bin/dpkg -s "$CURRENTREALPKGNAME" 2>&1 | grep -q ^Package:; then
	  if ! $CHROOTEXEC /usr/bin/apt-get -y remove $CURRENTREALPKGNAME ; then
	      echo "E: Could not satisfy build-conflicts" >&2
	      exit 1
	  fi
      else
	  echo "I: $CURRENTREALPKGNAME package is not installed, no need to remove"
      fi
    done
    echo " -> Finished parsing the build-deps"
}


print_help() {
    # print out help message
    cat <<EOF
pbuilder-satisfydepends -- satisfy dependencies
Copyright 2002-2007  Junichi Uekawa <dancer@debian.org>

--help:        give help
--control:     specify control file (debian/control, *.dsc)
--chroot:      operate inside chroot
--binary-all:  include binary-all
--binary-arch: include binary-arch only
--echo:        echo mode, do nothing. (--force-version required for most operation)
--force-version: skip version check.
--continue-fail: continue even when failed.

EOF
}

. "$PBUILDER_PKGLIBDIR"/pbuilder-satisfydepends-checkparams

