#!/usr/bin/perl
# debbuild script
# Shamlessly steals intreface from rpm's "rpmbuild" to create
# Debian packages.  Please note that such packages are highly
# unlikely to conform to "Debian Policy".
###
# SVN revision info
# $Date: 2005-11-02 19:37:45 +0000 (Wed, 02 Nov 2005) $
# SVN revision $Rev: 9 $
# Last update by $Author: kdeugau $
###

use strict;
use warnings;
use Fcntl;	# for sysopen flags

# Program flow:
# -> Parse/execute "system" config/macros (if any - should be rare)
# -> Parse/execute "user" config/macros (if any - *my* requirement is %_topdir)
# -> Parse command line for options, spec file/tarball/.src.deb (NB - also accept .src.rpm)

# User's prefs for dirs, environment, etc,etc,etc.
# config file ~/.debmacros
# Default ordered search paths for config/macros:
# /usr/lib/rpm/rpmrc  /usr/lib/rpm/redhat/rpmrc  /etc/rpmrc      ~/.rpmrc
# /usr/lib/rpm/macros /usr/lib/rpm/redhat/macros /etc/rpm/macros ~/.rpmmacros
# **NOTE:  May be possible to (ab)use bits of debhelper

# Build tree
# default is /usr/src/debian/{BUILD,SOURCES,SPECS,DEBS,SDEBS}

# Globals
my $specfile;
my $tarball;
my $srcpkg;
my $cmdbuildroot;
my $tarballdir;	# This should really be initialized, but the coding makes it, um, ugly.

# Initialized globals
my $verbosity = 0;
my %cmdopts = (type => '',
		stage => 'a',
		short => 'n'
	);
my $topdir = "/usr/src/debian";
my $buildroot = "/var/tmp/%{name}-%{version}-%{release}.root".int(rand(99998)+1);

# "Constants"
my %targets = ('p' => 'Prep',
		'c' => 'Compile',
		'i' => 'Install',
		'l' => 'Verify %files',
		'a' => 'Build binary and source',
		'b' => 'Build binary',
		's' => 'Build source'
	);
my $scriptletbase =
q(#!/bin/sh

  RPM_SOURCE_DIR="%{_topdir}/SOURCES"
  RPM_BUILD_DIR="%{_topdir}/BUILD"
  RPM_OPT_FLAGS="-O2 -g -march=i386 -mcpu=i686"
  RPM_ARCH="i386"
  RPM_OS="linux"
  export RPM_SOURCE_DIR RPM_BUILD_DIR RPM_OPT_FLAGS RPM_ARCH RPM_OS
  RPM_DOC_DIR="/usr/share/doc"
  export RPM_DOC_DIR
  RPM_PACKAGE_NAME="%{name}"
  RPM_PACKAGE_VERSION="%{version}"
  RPM_PACKAGE_RELEASE="%{release}"
  export RPM_PACKAGE_NAME RPM_PACKAGE_VERSION RPM_PACKAGE_RELEASE
  RPM_BUILD_ROOT="%{buildroot}"
  export RPM_BUILD_ROOT

  set -x
  umask 022
  cd %{_topdir}/BUILD
);

# Package data
# This is the form of $pkgdata{pkgname}{meta}
# meta includes Summary, Name, Version, Release, Group, Copyright,
#	Source, URL, Packager, BuildRoot, Description
# 10/31/2005 Maybe this should be flatter?  -kgd
my %pkgdata;

# Scriptlets
my $prepscript;
my $buildscript;
my $installscript;
my $cleanscript;

# Functions
sub prep;
sub parse_spec;

die "Not enough arguments\n" if #$argv == 0;

##main

load_userconfig();
parse_cmd();

if ($cmdopts{type} eq 'b') {
  # Need to read the spec file to find the tarball.  Note that
  # this also generates most of the shell script required.
  parse_spec();
}

# Hokay.  Need to:
# Execute prep if *not* --short-circuit
if ($cmdopts{stage} eq 'p' || ($cmdopts{stage} =~ /[cilabs]/ && $cmdopts{short} ne 'y')) {
  prep();
}
if ($cmdopts{stage} eq 'c' || ($cmdopts{stage} =~ /[ilabs]/ && $cmdopts{short} ne 'y')) {
  build();
}
if ($cmdopts{stage} =~ /[ilabs]/) {
  install();
}
if ($cmdopts{stage} eq 'a') {
  binpackage();
  srcpackage();
}
if ($cmdopts{stage} eq 'b') {
  binpackage();
}
if ($cmdopts{stage} eq 's') {
  srcpackage();
}

# Just in case.
exit 0;


## load_userconfig()
# Loads user configuration (if any)
# Currently only handles .debmacros
# Needs to handle "other files"
sub load_userconfig {
  my (undef,undef,undef,undef,undef,undef,undef,$homedir,undef) = getpwuid($<);
  if (-e "$homedir/.debmacros") {
    open USERMACROS,"<$homedir/.debmacros";
    while (<USERMACROS>) {
      # And we also only handle a few macros at the moment.
      if (/^\%_topdir/) {
	my (undef,$tmp) = split /\s+/, $_;
	$topdir = $tmp;
      }
    }
  }
} # end load_userconfig()


## parse_cmd()
# Parses command line into global hash %cmdopts, other globals
# Options based on rpmbuild's options
sub parse_cmd {
  # Don't feel like coding my own option parser...
  #use Getopt::Long;
  # ... but I may have to:  (OTOH, rpm uses popt, so maybe we can too.)
  #use Getopt::Popt qw(:all);
  # Or not.  >:(  Stupid Debian lack of findable Perl module names in packages.

  # Stuff it.
  my $prevopt = '';
  foreach (@ARGV) {
    chomp;

    # Is it an option?
    if (/^-/) {

      # Is it a long option?
      if (/^--/) {
	if (/^--short-circuit/) {
	  $cmdopts{short} = 'y';
	} elsif (/^--rebuild/) {
	  $cmdopts{type} = 's';
	} else {
	  print "Long opt $_\n";
	}
      } else {
	if (/^-[bt]/) {
	  if ($cmdopts{stage} eq 's') {
	    # Mutually exclusive options.
	    die "Can't use $_ with --rebuild\n";
	  } else {
	    ($cmdopts{stage}) = (/^-[bt]([pcilabs])/);
	    ($cmdopts{type}) = (/^-([bt])[pcilabs]/);
	  }
	} elsif (/^-v/) {
	  # bump verbosity.  Not sure what I'll actually do here...
	} else {
	  die "Bad option $_\n";
	}
      }
    } else {
      # --buildroot is the only option that takes an argument
      # Therefore, any *other* bare arguments are the spec file,
      # tarball, or source package we're operating on - depending
      # on which one we meet.
      if ($prevopt eq '--buildroot') {
	$cmdbuildroot = $_;
      } else {
	if ($cmdopts{type} eq 's') {
	  # Source package
 	  if (!/\.src\.(deb|rpm)$/) {
	    die "Can't --rebuild with $_\n";
	  }
	} elsif ($cmdopts{type} eq 'b') {
	  $specfile = $_;
	  # Spec file
	} else {
	  # Tarball
	}
      }
    }
    $prevopt = $_;
  } # foreach @ARGV

  # Some cross-checks.  rpmbuild limits --short-circuit to just
  # the "compile" and "install" targets - with good reason IMO.
  # NB - this is NOT fatal, just ignored!
  if ($cmdopts{short} eq 'y') {
    warn "Can't use --short-circuit for $targets{$cmdopts{stage}} stage.  Ignoring.\n";
    $cmdopts{short} = 'n';
  }
  # Valid options, with example arguments (if any):
# Build from .spec file; mutually exclusive:
  # -bp
  # -bc         
  # -bi         
  # -bl
  # -ba
  # -bb
  # -bs
# Build from tarball; mutually exclusive:
  # -tp
  # -tc
  # -ti
  # -ta
  # -tb
  # -ts
# Build from .src.(deb|rpm)
  # --rebuild
  # --recompile

# General options
  # --buildroot=DIRECTORY
  # --clean
  # --nobuild
  # --nodeps
  # --nodirtokens
  # --rmsource
  # --rmspec
  # --short-circuit
  # --target=CPU-VENDOR-OS

  #my $popt = new Getopt::Popt(argv => \@ARGV, options => \@optionsTable);

} # end parse_cmd()


## parse_spec()
# Parse the .spec file once we've.... uh....
sub parse_spec {
  open SPECFILE,"<$specfile";

LINE: while (<SPECFILE>) {
    next if /^#/;
    next if /^\s+$/;
    if (/^\%/) {
      # A macro that needs further processing.
      if (/^\%description/) {
	$pkgdata{main}{desc} .= $_;
        while (<SPECFILE>) {
          redo LINE if /^\%/;
          $pkgdata{main}{desc} .= " $_";
        }

      }
      if (/^\%prep/) {
	# %prep section.  May have %setup macro;  may include %patch tags,
	# may be just a bare shell script.

	# This really should be local-ish, but we need just the filename for the source
	$pkgdata{main}{source} =~ s|.+/([^/]+)$|$1|;

	# Replace some core macros
	$pkgdata{main}{source} =~ s/\%\{name\}/$pkgdata{main}{name}/;
	$pkgdata{main}{source} =~ s/\%\{version\}/$pkgdata{main}{version}/;

PREPSCRIPT: while (<SPECFILE>) {
	  if (/^\%setup/) {
	    # Parse out the %setup macro.  Note that we aren't supporting
	    # most of RPM's %setup features.
	    $prepscript .= "cd $topdir/BUILD\n";
	    if ( /\s+-n\s+([^\s]+)\s+/ ) {
	      $tarballdir = $1;
	    } else {
	      $tarballdir = "$pkgdata{main}{name}-$pkgdata{main}{version}";
	    }
	    $prepscript .= "rm -rf $tarballdir\ntar -".
		( $pkgdata{main}{source} =~ /\.tar\.gz$/ ? "z" : "" ).
		( $pkgdata{main}{source} =~ /\.tar\.bz2$/ ? "j" : "" ).
		"x".( /\s+-q\s+/ ? '' : 'vv' )."f ".
		"$topdir/SOURCES/$pkgdata{main}{source}\n".
		qq(STATUS=\$?\nif [ \$STATUS -ne 0 ]; then\n  exit \$STATUS\nfi\n).
		( /\s+-n\s+([^\s]+)\s+/ ?
		  "cd $1\n" : "cd $pkgdata{main}{name}-$pkgdata{main}{version}\n" ).
		qq([ `/usr/bin/id -u` = '0' ] && /bin/chown -Rhf root .\n).
		qq([ `/usr/bin/id -u` = '0' ] && /bin/chgrp -Rhf root .\n).
		qq(/bin/chmod -Rf a+rX,g-w,o-w .\n);
	  } elsif (/^\%patch/) {
	    print "patch macro\n";
	  } else {
	    last PREPSCRIPT if /^\%/;
	    $prepscript .= $_;
	  }
	}
	redo LINE;
      }
      if (/^\%build/) {
	# %build.  This is pretty much just a shell script.  There
	# *are* a few macros, but we're not going to deal with them yet.
	$buildscript .= "cd $tarballdir\n";
	while (<SPECFILE>) {
	  redo LINE if /^\%/;
	  $buildscript .= $_;
	}
      }
      if (/^\%install/) {
	$installscript .= "cd $tarballdir\n";
	while (<SPECFILE>) {
	  redo LINE if /^\%/;
	  $installscript .= $_;
	}
      }
      if (/^\%clean/) {
	while (<SPECFILE>) {
	  redo LINE if /^\%/;
	  $cleanscript .= $_;
	}
      }
      if (/^\%post/) {
      }
      if (/^\%preun/) {
      }
      if (/^\%files/) {
	# Danger! Danger!
      }
    } else {
      if (/^summary:\s+(.+)/i) {
	$pkgdata{main}{summary} = $1;
      } elsif (/^name:\s+(.+)/i) {
	$pkgdata{main}{name} = $1;
      } elsif (/^version:\s+(.+)/i) {
	$pkgdata{main}{version} = $1;
      } elsif (/^release:\s+(.+)/i) {
	$pkgdata{main}{release} = $1;
      } elsif (/^group:\s+(.+)/i) {
	$pkgdata{main}{group} = $1;
      } elsif (/^copyright:\s+(.+)/i) {
	$pkgdata{main}{copyright} = $1;
      } elsif (/^url:\s+(.+)/i) {
	$pkgdata{main}{url} = $1;
      } elsif (/^packager:\s+(.+)/i) {
	$pkgdata{main}{packager} = $1;
      } elsif (/^buildroot:\s+(.+)/i) {
	$buildroot = $1;
      } elsif (/^source:\s+(.+)/i) {
	$pkgdata{main}{source} = $1;
	die "Unknown tarball format $1\n" if $1 !~ /\.tar\.(?:gz|bz2)$/;
      }
#Name: suwrap
#Version: 0.04
#Release: 3
#Group: Applications/System
#Copyright: WebHart internal ONLY.  :(
#BuildArchitectures: i386
#BuildRoot: /tmp/%{name}-%{version}
#Url: http://virtual.webhart.net
#Packager: Kris Deugau <kdeugau@deepnet.cx>
#Source: ftp://virtual.webhart.net/%{name}-%{version}.tar.gz

    }
  }
  # Parse and replace macros
  # Start with the ones I use
#  $pkgdata{main}{source} =~ s/\%\{name\}/$pkgdata{main}{name}/;
#  $pkgdata{main}{source} =~ s/\%\{version\}/$pkgdata{main}{version}/;

# Scriptlet core.  Use /g to make sure all occurrences get tweaked.
  # "real" globals (apply to all packages the same way)
  $scriptletbase =~ s/\%\{_topdir\}/$topdir/g;

  # "fake" globals (may be tweaked by package)
  $buildroot = $cmdbuildroot if $cmdbuildroot;
  $scriptletbase =~ s/\%\{buildroot\}/$buildroot/g;

  # sub-package(compatible) stuff
  $scriptletbase =~ s/\%\{name\}/$pkgdata{main}{name}/g;
  $scriptletbase =~ s/\%\{version\}/$pkgdata{main}{version}/g;
  $scriptletbase =~ s/\%\{release\}/$pkgdata{main}{release}/g;

# Some more macro substitution.  Nrgh.
  $buildroot =~ s/\%\{name\}/$pkgdata{main}{name}/g;
  $buildroot =~ s/\%\{version\}/$pkgdata{main}{version}/g;
  $buildroot =~ s/\%\{release\}/$pkgdata{main}{release}/g;
} # end parse_spec()


## prep()
# Unpacks the tarball from the SOURCES directory to the BUILD directory.
# Speaks gzip and bzip2.
# Finishes by applying patches in %prep section of spec file
sub prep {
  {
    # create script filename
    my $prepscriptfile = "/var/tmp/deb-tmp.prep.".int(rand(99998)+1);
    sysopen(PREPSCRIPT, $prepscriptfile, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW)
	or die $!;
    print PREPSCRIPT $scriptletbase;
    print PREPSCRIPT $prepscript;
    close PREPSCRIPT;

    # execute
    print "Calling \%prep script $prepscriptfile...\n";
    system("/bin/sh -e $prepscriptfile") == 0
	or die "Can't exec: $!\nalso: $?";

    # and clean up
    unlink $prepscriptfile;
  }
} # end prep()


## build()
# Execute commands provided as a shell script.  It may prove simpler
# to do as rpm does and actually create a little shell script.
sub build {
  # create script filename
  my $buildscriptfile = "/var/tmp/deb-tmp.build.".int(rand(99998)+1);
  sysopen(BUILDSCRIPT, $buildscriptfile, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW)
	or die $!;
  print BUILDSCRIPT $scriptletbase;
  print BUILDSCRIPT $buildscript;
  close BUILDSCRIPT;

  # execute
  print "Calling \%build script $buildscriptfile...\n";
  system("/bin/sh -e $buildscriptfile") == 0
	or die "Can't exec: $!\nalso: $?";

  # and clean up
  unlink $buildscriptfile;
} # end build()


## install()
# Creates and executes %install script(let)
sub install {
  # create script filename
  my $installscriptfile = "/var/tmp/deb-tmp.inst.".int(rand(99998)+1);
  sysopen(INSTSCRIPT, $installscriptfile, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW)
	or die $!;
  print INSTSCRIPT $scriptletbase;
  print INSTSCRIPT $cleanscript;	# Clean up our install target before installing into it.
  print INSTSCRIPT $installscript;
  close INSTSCRIPT;

  # execute
  print "Calling \%install script $installscriptfile...\n";
  system("/bin/sh -e $installscriptfile") == 0
	or die "Can't exec: $!\nalso: $?";

  # and clean up
  unlink $installscriptfile;
} # end install()


## binpackage()
# Creates the binary .deb package from the installed tree in $buildroot.
sub binpackage {
  # Some checks on the .deb file location
  if (!-e "$topdir/DEBS/i386") {
#	"if [ -e $topdir/DEBS/i386 ]; then\n\tmkdir $topdir/DEBS/i386\nfi\n".
    mkdir "$topdir/DEBS/i386";
  }
  # Gotta do this first, otherwise the control file has nowhere to go.  >:(
  mkdir "$buildroot/DEBIAN";

  # create script filename
  my $debscriptfile = "/var/tmp/deb-tmp.pkg.".int(rand(99998)+1);
  sysopen(DEBSCRIPT, $debscriptfile, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW)
	or die $!;
  print DEBSCRIPT $scriptletbase;
  print DEBSCRIPT "tree $buildroot\n".
	"fakeroot dpkg-deb -b $buildroot $topdir/DEBS/i386/$pkgdata{main}{name}_$pkgdata{main}{version}-$pkgdata{main}{release}_i386.deb\n";

  close DEBSCRIPT;

  my $control = "Package: $pkgdata{main}{name}\n".
	"Version: $pkgdata{main}{version}-$pkgdata{main}{release}\n".
	"Section: unknown\n".
	"Priority: optional\n".
	"Architecture: i386\n".
	"Maintainer: $pkgdata{main}{packager}\n".
	"Description: $pkgdata{main}{desc}\n";

eval {
  open CONTROL, ">$buildroot/DEBIAN/control";
  print CONTROL $control;
  close CONTROL;
};
if ($@) {
  print $@;
}

#Package: httpd
#Version: 2.0.54-7via
#Section: unknown
#Priority: optional
#Architecture: i386
#Depends: libc6 (>= 2.3.2.ds1-21), libdb4.2, libexpat1 (>= 1.95.8), libssl0.9.7, libapr0
#Replaces: apache2
#Installed-Size: 3076
#Maintainer: Kris Deugau <kdeugau@vianet.ca>
#Description: apache2 for ViaNet
# apache2 for ViaNet.  Includes per-vhost setuid patches from
# http://home.samfundet.no/~sesse/mpm-itk/.


  # execute
  print "Creating .deb for $pkgdata{main}{name}...\n";
  system("/bin/sh -e $debscriptfile") == 0
	or die "Can't exec: $!\nalso: $?";

  # and clean up
  unlink $debscriptfile;

} # end binpackage()


sub srcpackage {}