#!/bin/bash

# Script to automate backporting r-base for CRAN

# Author: Johannes Ranke <jranke@uni-bremen.de>

# Developed in parallel with Vincent Goulet <vincent.goulet@act.ulaval.ca>
# On Debian I used to run this script as root. On Ubuntu I now run it with 
# sudo -E sh backport_r-base.sh

# Preconditions: - shell variables DIST and ARCH
#                - sid sources in /etc/apt/sources/list
#                - cdbs installed (and maybe more)

export DEBEMAIL="jranke@uni-bremen.de"
export DEBFULLNAME="Johannes Ranke"
echo Distribution is $DIST
echo Architecture is $ARCH

if [ -d r-base-* ]
then
    rm -rf `ls -d r-base-*`
fi

apt-get update
apt-get source -t unstable r-base

# Change any ~ in the name of the build directory for a - to avoid a
# bug in texi2dvi. Thanks Vincent
if [ -d r-base-*~* ]
then
    dir=`ls -d r-base-*~*`
    mv $dir `echo $dir | sed y/~/-/`
fi

cd r-base-*

# Old version
oldversion=`dpkg-parsechangelog | grep ^Version | cut -f2 -d " "`
cranversion=$oldversion"~"$DIST"cran.0"

echo Old version is $oldversion
echo CRAN version is $cranversion

# Add new version to changelog
dch -v "${cranversion}" --force-distribution -D $DIST-cran -b "Backport from Debian unstable to Debian $DIST"

# Reverts for lenny and etch:

    # 1. Starting with Debian packages for R 2.9.2 there is a build dependency
    # on debhelper >= 7.2.3, which is not in lenny nor etch This also means we
    # have to reinclude debian/r-doc-{info,html}.{postinst,prerm}, thanks Dirk
    # for pointing this out.

	sed -i '/^Build-Depends/s/debhelper (>= 7.2.3)/debhelper/' debian/control
	dch -a "debian/control: revert Build-Depends: to 'debhelper' since $DIST has a version < 7.2.3"
	sed -i 's/dh_prep/dh_clean/g' debian/rules
	dch -a "debian/rules: revert dh_prep calls to dh_clean calls since the latter is not present in this release's version of 'debhelper'" 

    # 2. Starting with Debian packages for R 2.9.2-2 there is an install
    # dependency on 'dpkg (>= 1.15.4) | install-info'. Neither package is in
    # Debian releases etch nor lenny. This also requires to reinclude
    # debian/r-doc-{info,html}.{postinst,prerm}, just like for the fix above.

    sed -i '/^Depends/s/dpkg (>= 1.15.4) | install-info/dpkg | install-info/' debian/control
    dch -a "debian/control: revert Depends: to 'dpkg | install-info' for r-doc-info since ${DISTRIB_DESCRIPTION} has a version of dpkg < 1.15.4 and no separate package install-info"

# Reverts for etch only:
if [ $DIST = "etch" ]
then
	# 1. Starting with Debian packages for R 2.6.1-2, the build dependency
	#    to 'refblas3-dev|atlas3-base-dev' is changed to 'libblas-dev' to
	#    use the new gfortran-built BLAS libraries. From R 2.7.0, the
	#    dependency is on 'libblas-dev | libatlas-base-dev' for
	#    r-base-dev.

	sed -i '/^Build-Depends/s/libblas-dev/refblas3-dev|atlas3-base-dev/' debian/control
	sed -i '/^Depends/s/libblas-dev | libatlas-base-dev/refblas3-dev|atlas3-base-dev/' debian/control
	dch -a "debian/control: revert Build-Depends: to 'refblas3-dev|atlas3-base-dev' and Depends: to 'refblas3-dev|atlas3-base-dev' since etch does not have the new gfortran-built BLAS libraries"

	# 2. Starting with Debian packages for R 2.6.2, new build dependency
	#    on liblapack-dev to switch back to using Debian's Lapack rather
	#    than the version supplied by R. From R 2.7.0, the dependency is
	#    on 'liblapack-dev (>= 3.1.1)' for r-base and 'liblapack-dev |
	#    libatlas-base-dev' for r-base-dev.

	sed -i '/^Build-Depends/s/liblapack-dev (>= 3.1.1), //' debian/control
	sed -i '/^Depends/s/liblapack-dev | libatlas-base-dev, //' debian/control
	    dch -a "debian/control: revert Build-Depends: and Depends: fields since we use the Lapack supplied with R"
	    sed -i '/^lapack/{
	s/lapack/\#lapack/
	a\
	# jr 24 Apr 2008 Set to =no for Debian etch
	a\lapack                = --with-lapack=no
	}'  debian/rules
	    dch -a "debian/rules: Accordingly, do not configure --with-lapack"

	# 3. Requirement for tk8.4 >= 8.4.16-2 introduced in r-base 2.6.0-4 to
	#    circumvent a breakage with 8.4.16-1. The version in etch is 8.4.12-1etch2.

	rm debian/shlibs.local
	dch -a "delete debian/shlibs.local since the dependency on tk8.4 is not an issue for Debian etch"

	# 4. The TeX distribution in etch is tetex

	sed -i '/^Build-Depends/s/texlive-base, texlive-latex-base, texlive-generic-recommended, texlive-fonts-recommended, texlive-extra-utils, texlive-latex-recommended, texlive-latex-extra, texinfo, texi2html/tetex-bin, tetex-extra/' debian/control
	dch -a "debian/control: revert Build-Depends: to 'tetex-bin, tetex-extra' since etch does not have texlive"

	# 5. xauth is part of xbase-clients in etch

	sed -i '/^Build-Depends/s/xauth/xbase-clients/' debian/control
	dch -a "debian/control: replace xauth by xbase-clients in Build-Depends:"

	# 6. Tcl and TK are 8.4 on Debian etch

	sed -i '/^Build-Depends/s/ tcl8.5-dev/tcl8.4-dev/' debian/control
	sed -i '/^Build-Depends/s/ tk8.5-dev/tk8.4-dev/' debian/control
	dch -a "debian/control: revert build dependence for tcl/tk to 8.4"

	# 7. Openjdk is not in etch

	sed -i '/^Build-Depends/s/, openjdk-6-jdk \[!arm !hppa !kfreebsd-i386 !kfreebsd-amd64 !hurd-i386\]//' debian/control
	dch -a "debian/control: Remove build dependence on openjdk"

        # 8. Debhelper in etch is 5.0.42

	echo 5 > debian/compat
	dch -a "debian/compat: revert 'debhelper' compatibility level to 5"

	# 9. R 2.9.0 wants ucf >= 3.0 which is not available in etch (2.0020)

	sed -i 's/ucf (>= 3.0)/ucf/' debian/control
	dch -a "debian/control: revert Depends: of r-base-core to 'ucf' since the version in etch is < 3.0"
fi

pbuilder update
pdebuild --debbuildopts '-sa' --buildresult /home/ranke/svn/website/www/ranke/r-cran/$DIST-cran/ -- --distribution $DIST --basetgz /var/cache/pbuilder/$DIST-$ARCH-base.tgz --aptcache /var/cache/pbuilder/$DIST-$ARCH/aptcache --buildplace /var/cache/pbuilder/$DIST-$ARCH/build
if [ $? -ne 0 ]; then
    exit 
fi

cd ..