#!/bin/bash
# $Id$
#
# Usage: export-boinc -r 4.72
#     or export-boinc -r 4.72 -d 20050724
#     or export-boinc -r 4.72 -d 20050724 -s
#     or export-boinc -r 4.72 -s
#     or export-boinc -s
#     or export-boinc

set -e

GIT_ROOT="http://boinc.berkeley.edu/git/boinc-v2.git"

# Define default values which can be overriden by command line options
# and get the command line options.
#
SNAPSHOT=0
DIRS="tarfiles/boinc tarfiles tarballs/boinc tarballs"

function showhelp () {
    cat <<EOHELP

Usage: export-boinc <options>

  This script downloads from the developers' git repository a particular
  version of the BOINC (Berkeley Open Infrastructure for Network
  Computing) middleware for volunteer computing. It clones everything
  or performs a pull on ./boinc-v2 .

  Options:

    -r X.Y.Z    retrieve particular release
#   -d YYYYMMDD retrieve version of particular day # no idea how to do this with git ATM
    -s          retrieve snapshot
    -h          print this usage description
    -t PATH     specify directory at which to store tarfile

  These options can be combined. The retrieval of the very latest
  version (HEAD) is the default. This script can be executed from any
  directory. If executed from one that has any of the following as a
  subdirectory, it will place it in the first suitable one:

EOHELP
    echo "    $DIRS"

    echo
    echo "  This script lives as 'export-boinc' in git+ssh://git.debian.org/git/pkg-boinc/scripts.git ."
    echo

    exit 0
}

if [ "$1" == "--help" ]; then
    showhelp
    exit 0
fi

if [ -d boinc-v2 ]; then
    if [ ! -d boinc-v2/.git ]; then
       echo "E: found directory 'boinc-v2' which is not a git repository where I meant to export the boinc source tree to. Please clean up."
       exit 1
    fi
fi

if [ -f boinc-v2 ]; then
    echo "E: found file 'boinc-v2' where I meant to export the boinc source tree to. Please clean up."
    exit 1
fi

while getopts "r:d:t:sh" FLAG
do
    if [ "$FLAG" = "r" ]; then
        VERSION=$OPTARG
    elif [ "$FLAG" = "d" ]; then
        DATE=$OPTARG
    elif [ "$FLAG" = "s" ]; then
        SNAPSHOT=1
    elif [ "$FLAG" = "t" ]; then
        DIRS=$OPTARG
    elif [ "$FLAG" = "h" ]; then
	showhelp
	exit 0
    fi
done


# Parse/validate the given command line options to construct the
# appropriate git command to download the upstream source code.
#
if [ -z "$VERSION" ]; then
    echo "W: version number was not specified, assuming 'HEAD'"
    VERSION="HEAD"
fi

if [ -z "$ORIG_SUFFIX" ]; then
    #ORIG_SUFFIX=".orig"
    ORIG_SUFFIX=""
fi

if [ -z "$DATE" ] && [ "$SNAPSHOT" -eq 0 ]; then
    DEBIAN_VERSION="$VERSION+dfsg"

elif [ -n "$DATE" ] && [ "$SNAPSHOT" -eq 0 ]; then
    DEBIAN_VERSION="$VERSION+dfsg"
    ORIG_DIR="boinc-${DEBIAN_VERSION}${ORIG_SUFFIX}"

elif [ -n "$DATE" ] && [ "$SNAPSHOT" -eq 1 ]; then
    DEBIAN_VERSION="$VERSION~snapshot.$DATE+dfsg"

elif [ -z "$DATE" ] && [ "$SNAPSHOT" -eq 1 ]; then
    DATE=$(date +%Y%m%d)
    DEBIAN_VERSION="$VERSION~snapshot.$DATE+dfsg"
fi

# A few tests on tools needed for this script
missing=""
for i in xargs find
do
    if [ ! -x /usr/bin/$i ]; then
        missing="$missing $i"
    fi
done
if [ -n "$missing" ]; then
    echo "Missing the following tools in /usr/bin: $missing"
    exit 1
fi

if [ -d boinc-v2 ]; then
    echo "I: Updating BOINC source tree. This takes a bit of time."
    cd boinc-v2
    git pull
else
    echo "I: Cloning BOINC source tree. This takes a while, maybe five minutes."
    git clone $GIT_ROOT
    cd boinc-v2
fi

# Remove non-free or unneeded sources or cruft from the upstream source
# code before creating the tarball.

cat > .gitattributes <<EOATTRIBUTES
*.dll export-ignore
*.exe export-ignore
# compiled samples ... also for Linux shall not be with the source
samples/example_app/bin export-ignore
#TODO should we remove ttf files?
# [non-free] Contains binary textured font files (.ttf) without source.
api/ttf export-ignore
# license fails to explicitly express that is allows modifications
api/ttfont.{cpp,h} export-ignore
# redundant with GLUT library, license does not express clearly freedom to modify
samples/glut export-ignore
# [non-free] File is licensed under the BOINC Public License which is
# DFSG-incompatible.
zip/configure export-ignore
# DFSG-incompatible Apple Public Source License (APSL).
lib/mac export-ignore
# [non-free] The file lib/mac/dyld_gdb.h is licensed under the
# [unneeded] This 3rd party software is already in Debian and we added
# them to boinc's Build-Depends.
curl export-ignore
#zlib and openssl not included anymore in the source tree
#zlib export-ignore
#openssl export-ignore
samples/jpeglib export-ignore
# [unneeded] Cruft that is not needed to build the BOINC software.
.vimrc export-ignore
#.cvsignore not included anymore in the source tree
#.cvsignore export-ignore
# [non-free, unneeded] Unneeded build systems and binaries without
# source.
coprocs export-ignore
win_build export-ignore
mac_build export-ignore
#client/mac not included anymore in the source tree
#client/mac export-ignore
clientgui/mac export-ignore
mac_installer export-ignore
client/app_stats_mac.cpp  export-ignore
# modified in build process
version.h export-ignore
#config.sub and config.guess not included anymore in the source tree
#config.sub export-ignore
#config.guess export-ignore
.gitignore export-ignore
# bzr stuff and debian directory isn't needed
# if you use the same source tree for building the latest version
# with this debian revision https://code.launchpad.net/~costamagnagianfranco/+junk/boinc-upstream-merge
# you can erroneously export these directories too
.bzr export-ignore
.bzrignore export-ignore
debian export-ignore
EOATTRIBUTES

# source files should not be executable
#the previous version had problem with spaces in the path
#find . -name "*.cpp" -exec chmod 0644 {} \;
#find . -name "*.h"   -exec chmod 0644 {} \;
#find . -name "*.png" -exec chmod 0644 {} \;

# If HEAD was specified as version number, read the actual version
# number from configure.ac and rename the $ORIG_DIR
# accordingly.
#
MAJOR_RELEASE=7.1
TAG=client_release/$MAJOR_RELEASE/$VERSION
if [ $VERSION = "HEAD" ]; then
    CFG_AC="configure.ac"
    if [ ! -r $CFG_AC ]; then
        echo "I: Could not find $CFG_AC in `pwd`"
        exit 1
    fi
    VERSION="$(grep AC_INIT $CFG_AC | cut -d ',' -f 2 | sed 's/\s*)*//g')"
    DEBIAN_VERSION="$VERSION+dfsg"
    echo "Retrieved version '$VERSION' from 'configure.ac'"
    TAG=master
fi
ORIG_DIR="boinc-${DEBIAN_VERSION}${ORIG_SUFFIX}"
ORIG_ARCHIVE="boinc_${DEBIAN_VERSION}.orig.tar.gz"

# Look for suitable directories where we can place the orig tarball.
# If none default directory is suitable we use the current working
# directory.
#
DEST_DIR=".."
for dir in $DIRS
do
    if [ "$DEST_DIR" = "." ] && [ -d "$dir" ] && [ -w "$dir" ]; then
        DEST_DIR="$dir"
    fi
done
if [ "$DEST_DIR" = ".." ]; then
    echo "W: no suitable destination directory for the tarball found"
fi

GIT_COMMAND="git archive --worktree-attributes  -v --format tgz -o $DEST_DIR/$ORIG_ARCHIVE -9 --prefix $ORIG_DIR/ $TAG"

# Print the git command invocation and export the BOINC source code
# from upstream's Subversion repository.
#
echo "$GIT_COMMAND"
$GIT_COMMAND

echo "[ok]"

exit 0