#!/bin/bash
#   pbuilder -- personal Debian package builder
#   Copyright (C) 2001,2002,2003,2005-2007 Junichi Uekawa
#   Copyright (C) 2006,2007 Loïc Minier
#
#   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; experimental flavor

# can test this with:
# testsuite/random-manual-test-material/build-depends-on-experimental:
# sudo pbuilder --build --configfile config bde_0.1.dsc

set -e

. "${BASH_SOURCE%/*}/pbuilder-satisfydepends-funcs"

# Use this function to fulfill the dependency (almost)
function checkbuilddep_internal () {
    local ARCH=$($CHROOTEXEC dpkg-architecture -qDEB_HOST_ARCH)
    local INSTALLPKG
    local INSTALLPKGLIST
    local INSTALLPKGMULTI
    local CURRENTREALPKGNAME
    local SATISFIED
    local PACKAGEVERSIONS
    local CANDIDATE_VERSION
    local APTFLAG="-o APT::Install-Recommends=false"
    echo " -> Attempting to parse the build-deps"
    for INSTALLPKGMULTI in $(get_build_deps |
	tr " " "/" | \
	awk 'BEGIN{RS=","} {print}'); do
      echo " -> Considering build-dep$(echo "$INSTALLPKGMULTI" | tr "/" " " )"
      SATISFIED="no"
      for INSTALLPKG in $(echo "$INSTALLPKGMULTI" | \
	  awk 'BEGIN{RS="|"} {print}'); do
	CURRENTREALPKGNAME=$(echo "$INSTALLPKG" | sed -e 's#^/*##' -e 's#[[/(].*##')
	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

	CURRENT_APT_COMMAND="$(versioneddep_to_aptcmd "$INSTALLPKG")"

	while [ "$SATISFIED" = "no" ]; do
	    echo "   -> Trying to add $CURRENT_APT_COMMAND"
	    if APT_OUTPUT="$( exec 2>&1; LC_ALL=C $CHROOTEXEC /usr/bin/apt-get -s install $APTFLAG $INSTALLPKGLIST $CURRENT_APT_COMMAND )"; then
		# success, we're done
		SATISFIED="yes"
		INSTALLPKGLIST="$INSTALLPKGLIST $CURRENT_APT_COMMAND"
		break
	    fi
	    # try to parse APT's output to recognize lines such as:
	    #   libfoo-dev: Depends: bar (>= xyz) but www is to be installed
	    DEP_INSTALLPKG="$(echo "$APT_OUTPUT" | \
		sed -n \
		    -e "s/^ *.*: *Depends: *\(.*\) but.*is to be installed\$/\\1/p" \
		    -e "s/^ *.*: *Depends: *\(.*\) but it is not going to be installed\$/\\1/p" \
		    -e "s/^ *.*: *Depends: *\(.*\)\$/\\1/p" | \
		head -1 | \
		tr " " "/")"
	    APT_ADD_COMMAND="$(versioneddep_to_aptcmd "$DEP_INSTALLPKG")"
	    if echo "$CURRENT_APT_COMMAND" | grep -q "$APT_ADD_COMMAND"; then
		# loop detected, give up with real packages
		echo "   -> Loop detected, last APT error was: ======"
		echo "$APT_OUTPUT"
		echo "   -> ========================================="
		echo "   -> (not adding $APT_ADD_COMMAND to $CURRENT_APT_COMMAND)"
		break
	    fi
	    CURRENT_APT_COMMAND="$CURRENT_APT_COMMAND $APT_ADD_COMMAND"
	done
	if [ "$SATISFIED" = "yes" ]; then
	    break;
	fi

	echo "       -> Cannot install $CURRENT_APT_COMMAND; apt errors follow:"
	if $CHROOTEXEC /usr/bin/apt-get -s install $APTFLAG $INSTALLPKGLIST "$CURRENT_APT_COMMAND"; 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 $CHROOTEXEC /usr/bin/apt-get -s install $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:"
		if $CHROOTEXEC /usr/bin/apt-get -s install $APTFLAG $INSTALLPKGLIST $PROVIDED; then
		    :
		fi
	    fi
	fi
	if [ "$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[@]}" $APTFLAG install $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[@]}" $APTFLAG install $INSTALLPKGLIST; then
	    echo " -> Apt bug workaround succeeded"
	elif [ "$CONTINUE_FAIL" != "yes" ]; then
	    echo "E: Unrecoverable error installing build-dependencies." >&2
	    exit 1
	fi
    fi

    # start processing build-conflicts.
    for INSTALLPKG in $(get_build_conflicts |
	tr " " "/" | \
	awk 'BEGIN{RS=","} {print}'); do
      CURRENTREALPKGNAME=$(echo "$INSTALLPKG" | sed -e 's#^/*##' -e 's#[[/(].*##')
      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 \
		$(echo "$INSTALLPKG" | tr "/" " " | sed 's/^.*( *\(<<\|<=\|>=\|=\|<\|>>\|>\) *\(.*\)).*$/\1/') \
		$(echo "$INSTALLPKG" | tr "/" " " | sed 's/^.*( *\(<<\|<=\|>=\|=\|<\|>>\|>\) *\(.*\)).*$/\2/'); then
	      echo "I: Satisfies version, not trying"
	      continue
	  fi
      fi

      # if package exists, remove it.
      if $CHROOTEXEC /usr/bin/dpkg -s $(echo "$INSTALLPKG" | tr "/" " " | awk '{print $1}') 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"
}


function 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
}

. "${BASH_SOURCE%/*}/pbuilder-satisfydepends-checkparams"