#! /bin/sh

# The Helix GNOME Pre-Installer
#
# Guilty party:
#   Nat Friedman (nat@helixcode.com)
#
# Party of less guilt:
#   Jacob Berkman (jacob@helixcode.com)
#
# Comments to:
#   distribution@helixcode.com
#
# Copyright 2000, Helix Code, Inc.
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
#
#
# This script and its embedded programs are distributed with
# absolutely, positively NO WARRANTY WHATSOEVER, without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
# PURPOSE.  The author and Helix Code, Inc. take no responsibility for
# the consequences of running this script.


#
# Four steps:
#
# 1. Figure out what kind of system we're running on.
#
# 2. Extract the proper snarf binary.
#
# 3. Grab the appropriate Helix Installer from
#    spidermonkey.helixcode.com
#
# 4. Uncompress it, chmod it, and run it.
#

# TODO:
#
# - handle X authorization
# - automatically su
# - accept -d (temp dir) and --display ($DISPLAY) arguments
# - color


# globals
_awk=awk
cachedir=/var/cache/helix-install

# prints out version info
# update this before uploading

VERSION=1.5.5
DATESTAMP="Thu Nov  9 13:56:50 EST 2000"

print_version () {
    echo "go-gnome: $VERSION ($DATESTAMP)"
}

# Exits with an error message when the user is not root.
bail_root () {
    echo Error!
    echo
    echo "Only root (the superuser) can run the Helix GNOME installer."
    echo Please use the \"su\" command to get root privileges, or
    echo contact your system administrator for assistance.
    echo

    exit 1
}

# exits with a custom error message
bail_error () {
    echo Error!
    echo
    echo $1
    echo
    exit 1
}

# Exits with an error message when the operating system is not supported.
#
# $1: Operating system name
bail_os () {
    echo Error!
    echo
    echo We are sorry, but the operating system \`$1\' is not
    echo supported by the Helix GNOME installer.  We apologize for the
    echo inconvenience.  Please see http://www.helixcode.com/desktop/
    echo for support.
    echo
    exit 1
}

# Exits with an error message when the machine architecture is not supported.
#
# $1: Architecture name.
bail_cpu () {
    echo Error!
    echo
    echo We are sorry, but the Helix GNOME installer is not available
    echo for computers of type \`$1\'.  Please see http://www.helixcode.com/desktop/
    echo for more information.
    echo
    exit 1
}

# Exits with an error message when a temporary file name cannot be created.
bail_temp () {
    echo Error!
    echo
    echo Could not create a temporary file name!  Please mail 
    echo submit@bugs.helixcode.com to report this bug.
    echo
    exit 1
}

# Exits with an error message when the installer binary cannot be downloaded.
#
# $1: URL of the file that was to be downloaded.
# $2: Destination filename.
bail_dlfailed () {
    echo Error!
    echo
    echo The download of the installer was unsuccessful.  Please 
    echo mail submit@bugs.helixcode.com with a description of the problem, 
    echo including any error messages that were displayed.
    echo 
    echo The installer was being downloaded from \`$1\' into \`$2\'.
    echo
    exit 1
}

# Exits with an error message when a file cannot be gunzipped
bail_gzip () {
    echo Error!
    echo
    echo A downloaded file could not be unzipped.  Please mail
    echo submit@bugs.helixcode.com to report this bug.
    echo
    exit 1
}

# Exits with an error message when a file cannot be gunzipped
bail_display () {
    echo Error!
    echo
    echo The Helix GNOME Installer is a graphical application, and
    echo either you have no DISPLAY variable set or the root user does
    echo have permission to access your X server.  Run 'xhost +localhost'
    echo before becoming root, and make sure that the DISPLAY variable is
    echo set correctly before running the go-gnome script.
    echo
    exit 1
}


my_uudecode () {
   _awkprog="$cachedir/uudecode.awk"
   _uudecode_out=$1

   rm -f ${_uudecode_out}
   cat > ${_awkprog} <<EOF
function x(l, p) {
  n="!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_";
  return index(n,substr(l,p+1,1));
}
/^begin/ {}
/^[^be]/ {
 len = x(\$0, 0);
 for (i=1;len>0;i+=4) {
  a=x(\$0,i);b=x(\$0,i+1);c=x(\$0,i+2);d=x(\$0,i+3);
  printf("%c",a*4+b/16);
  if (len>1) {
   printf("%c",b*16+c/4);
   if (len>2) {
    printf("%c",c*64+d);
   }
  }
  len-=3;
 }
}
EOF
    ${_awk} -f ${_awkprog} > ${_uudecode_out}
    rm -f ${_awkprog}
}

# Extracts the snarf binary for Linux i386 machines.
extract_snarf_linux_intel () {
  sed 's/^X//' << 'SHAR_EOF' | my_uudecode $SNARF.gz
begin 600 snarf.gz
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M2S=`#,[:(=EE6=KW!4A)**6;4658)W&-0]SHG7/OE24[)-O=[[U_WK<#1_>>
M>\^]Y]QSSSWGS'AFK_6A"H/!0.*7D:00BGU+$.^#XI$EK/T^(I$TDD_N(+=#
MB3A``&@`>J&.D`H@`*0`#"-`'\(,J,_@?08.]((^A&\6$X*`XXF%]>\#?%^O
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M"M`I0-=MG$B'H"71X3>%R.SQ.0FZ^'<-WTZBPQCY^#SV[==DOM]-LI<`T`6`
MSI@^\9LQO)[G=+AW]#O"8J:WR?/]CR0Z?//X0'&B+YGNY20ZO/'_87'B4"?3
M'4FB>P'H7O@"NM>2Z#"VOP1TA\GG]=?+=9+"\Q_\[O$@MQ>2M&^G>4F_OSL%
M>EX(^RM]7B]G)GUCAW0_-G[>GM_AYPTO[/_Q?83\]A;G<EK2-W]X[5Y,R*5;
-?,_W?P`:,CV':#H``'0_
`
end
SHAR_EOF
}

# Extracts the snarf binary for Linux PowerPC machines.
extract_snarf_linux_ppc () {
  sed 's/^X//' << 'SHAR_EOF' | my_uudecode $SNARF.gz
begin 664 snarf.gz
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&:"A\2@``
`
end
SHAR_EOF

}

#
# The action starts here.
#

#
# Step 1
#
# Figure out what kind of system we're running on.
#
# Don't use "echo -n" here, because if we're on something SysV-ish,
# that will print -n instead of not printing a newline.

print_version

echo "==> Autodetecting system type..."

os=`uname -s`
if [ $os != Linux ]
then
    bail_os $os
fi

PROC=`uname -m`

if [ $PROC != i686 -a $PROC != i586 -a $PROC != i486 -a $PROC != i386 -a $PROC != ppc ]
then
    bail_cpu $PROC
fi

gzip -h >/dev/null 2>&1
if [ $? -eq 0 ] ; then
    _gunzip="gzip -d"
else
    gunzip -h >/dev/null 2>&1
    if [ $? -eq 0 ] ; then
	_gunzip="gunzip"
    else
	bail_error "Required command, gzip or gunzip not found in path."
    fi
fi

if [ `id -u` != 0 ]
then
    bail_root
fi

echo "==> Checking \$DISPLAY and X permissions"
if [ -z $DISPLAY ]
then
    bail_display
fi

xhost &> /dev/null
if [ $? -ne 0 ]
then
    bail_display
fi

if [ $TERM != emacs ]
then
    reset
    clear
fi

print_version

echo
echo Welcome to the Helix GNOME pre-installer.
echo

echo This script is meant to make installing GNOME as easy as
echo "possible.  Just read the text below, hit ENTER, and you're"
echo on your way.
echo
echo Helix GNOME ships with no warranty whatsoever, without 
echo even the implied warranty of merchantability or fitness for a 
echo particular purpose.   The author and Helix Code, Inc take no 
echo responsibility for the consequences of running this script.
echo
echo Please send any questions to distribution@helixcode.com. 
echo
echo To install Helix GNOME now, hit ENTER.
echo
echo To cancel, hit Control-C.
echo

read foo < /dev/tty

#
# Step 1.5
#
# If this is a Deban system, we do something different...
#

if [ -e /etc/debian_version ]
then

echo It appears you are on a Debian system...
echo
echo This script will add the Helix distribution site to your sources.list
echo file, if it is not already there, and perform apt-get update.
echo
echo Hit ENTER to continue, or hit Control-C to cancel.
echo

read foo < /dev/tty

grep helixcode.com /etc/apt/sources.list > /dev/null
if [ $? -ne 0 ]
then
    echo "" >> /etc/apt/sources.list
    echo "deb http://spidermonkey.helixcode.com/distributions/debian unstable main" >> /etc/apt/sources.list

    echo "sources.list updated."
    echo
else
    echo "It appears that you already have the necessary entries in sources.list."
    echo
fi

echo "Running apt-get update..."
apt-get update
if [ $? -ne 0 ]
then
    echo "An error occured while running apt-get update."
    echo
    exit 1
fi

echo
echo '1. Run apt-get upgrade only (if upgrading from previous Helix version)'
echo '2. Install Helix GNOME (core files only)'
echo '3. Install Helix GNOME (full installation)'
echo 
echo -n 'Enter your choice here: '

choose_debian_option() {

    read mnum < /dev/tty

    if [ x$mnum = x1 ] ; then
	apt-get upgrade
	echo "Upgrade finished!"
	echo
	exit 0
    elif [ x$mnum = x2 ] ; then
	apt-get install task-helix-core
	echo "Install finished!"
	echo
	exit 0
    elif [ x$mnum = x3 ] ; then
	apt-get install task-helix-gnome
	echo "Install finished!"
	echo
	exit 0
    else
	echo "Invalid option."
	echo
	choose_debian_option
    fi
}

choose_debian_option

# Debian stuff ends here
exit 0
fi

#
# Step 1.75
#
# set up /var/cache/helix-install
#

mkdir -p -m 644 $cachedir
if test $? != 0; then
    bail_temp
fi

cd $cachedir
if test $? != 0; then
    bail_temp
fi

#
# Step 2
#
# Extract the proper snarf binary.
#

echo -n "==> Extracting snarf..."

SNARF="$cachedir/snarf"
if [ $? -ne 0 ]
then
    bail_temp
fi

if [ $PROC = i686 -o $PROC = i586 -o $PROC = i486 -o $PROC = i386 ]
then

    extract_snarf_linux_intel

elif [ $PROC = ppc ]
then

    extract_snarf_linux_ppc

fi

rm -f $SNARF
${_gunzip} $SNARF.gz
if [ $? -ne 0 ]
then
    bail_gzip
fi
chmod +x $SNARF

echo done.

#
# Step 3
#
# Grab the Helix installer.
#

echo 
echo
echo "Ok, first I'm going to grab the Helix GNOME installation program."
echo "I just need you to select a mirror site from the following list."
echo "Try to select a site which is near to you geographically.  "
echo
echo -e "1.  Helix Code, Inc.\t\t Ubiquitous (Akamaized)"
echo -e "2.  Eazel, Inc.\t\t\t Palo Alto, CA, USA"
echo -e "3.  RPM Find\t\t\t Cambridge, MA, USA"
#echo -e "4.  Duke LUG\t\t Durham, NC, USA"
#echo -e "5.  Linux.org.UK\t\t Leeds, UK"
echo

select_mirror () {

echo -n "Type the number of your preferred mirror here: "

read mnum < /dev/tty

if [ x$mnum != x1 -a x$mnum != x2 -a x$mnum != x3 -a x$mnum != x4 -a x$mnum != x5 ]
then
    echo
    echo "I'm sorry, you must select a mirror which is on the list."
    echo
    select_mirror
fi


if   [ x$mnum = x1 ]
then
    mirror="http://a1220.g.akamai.net/7/1220/1405/20001109120000/spidermonkey.helixcode.com/"
elif [ x$mnum = x2 ]
then
    mirror="http://207.88.54.108/helix/"
elif [ x$mnum = x3 ]
then
    mirror="http://18.29.1.67/linux/helix/"
elif [ x$mnum = x4 ]
then
    mirror="http://152.16.249.23/helix/"
elif [ x$mnum = x5 ]
then
    mirror="http://195.92.249.252/"
fi

}

select_mirror

echo "==> Fetching the main installation program; please be patient..."

INSTALLER="$cachedir/installer"

if [ $PROC = i686 -o $PROC = i586 -o $PROC = i486 -o $PROC = i386 ]
then
    dl_file="installer-rpm3-intel.gz"
    if [ -f /etc/redhat-release ]; then
	if grep "Red Hat Linux release 7.0" /etc/redhat-release 2>/dev/null; then
	    dl_file="installer-rpm4-intel.gz"
	fi
    fi
    $SNARF -n $mirror$dl_file $INSTALLER.gz
elif [ $PROC == ppc ]
then
    dl_file="installer-rpm3-ppc.gz"
    $SNARF -n $mirror$dl_file $INSTALLER.gz
fi


if [ ! -s $INSTALLER.gz ]
then
    bail_dlfailed $dl_file $INSTALLER
fi

echo done.

#
# Step 4
#
# Go, go, go!
#

rm -f $INSTALLER
${_gunzip} $INSTALLER.gz
if [ $? -ne 0 ]
then
    bail_gzip
fi
chmod +x $INSTALLER

echo "Installer extracted into $INSTALLER."
echo "Running with arguments: $@"

$INSTALLER $@

echo -n "==> Cleaning up temporary files..."
rm -f $INSTALLER
rm -f $SNARF
echo "done."