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# Copyright (C) 2008 ERG Limited, All rights reserved

#

# Module name   : CreateSdImage.pm

# Module type   : Makefile system

# Compiler(s)   : Perl

# Environment(s): jats

#

# Description   : Create a File System Image from a directory

#                 tree.

#                 Create the various file partitions and images

#                   0) Determine the partition sizes

#                   1) Create an empty image of the entire SD card

#                   2) Partition it up

#                   3) Determine the real size of each patition

#                   4) Create ext3 file system images

#                   5) Transfer the file system images into the SD image

#                   6) Install grub - if required

#

#......................................................................#

require 5.008_002;

use strict;

use warnings;

package CreateSdImage;

use JatsError;

use JatsSystem;

use FileUtils;

use File::Path;

# automatically export what we need into namespace of caller.

use Exporter();

our (@ISA, @EXPORT);

@ISA         = qw(Exporter);

@EXPORT      = qw(

                    CreateSdImage

                );

#

#   Data structure to describe the ouput partition(s)

#   Defined early so that it can be modified by the platform specific hook

#   Structure is a hash of hashed elements

#   Key: Partition number

#        Partition-0 is used to hold a complete (test) image

#

#   Value: A hash of other entries

#          These are

#          Key: name        - Name of the partition

#               root        - Partition mount point

#               size        - Size in Megabytes of the partition

#                             'rest' is auto calculated

#               type        - Optional. If 'extended', then an extended

#                             partition will be created and all following

#                             partitions will be created in that extended

#                             partition

#               noprune     - Don't prune after partition

#                             Set internally.

#

our %partitions = (

        1 => { name=>"rootfs",      root=>"/" ,         size=>30, },

        2 => { name=>"logfs" ,      root=>"/var/log" ,  size=>20, },

        3 => { name=>"afcfs",       root=>"/afc" ,      size=>150,  },

        4 => { name=>"varfs",       root=>"/var" ,      size=>"rest" },

#       4 => { type=>"extended" },

    );

#-------------------------------------------------------------------------------

# Function        : CreateSdImage

#

# Description     : Create an ETX3 File System Image froma directory

#

# Inputs          : $outdir             - Target directory

#                   $image_name         - Root name of the output image

#                   $WORK               - Root of file system image

#                   $BUILD              - Scratch Work Area

#                   $disk_blocks        - Size of target disk

#                   $fullfs             - Size of test full fs

#

# Returns         : 

#

sub CreateSdImage

{

    my ($outdir,$image_name,$WORK, $BUILD, $disk_blocks, $fullfs) = @_;

    my $install_grub = ( -f "$WORK/boot/grub/grub" );

    #

    #   Ensure that the required utility programs can be found and that they

    #   are being consumed from packages and not from the users path

    #

    Error ( "Required utility program not found in package: e2fsimage" )

        unless ( LocateProgInPath ('e2fsimage' ) );

    Error ( "Required utility program not found in package: grub" )

        unless ( ! $install_grub || LocateProgInPath ('grub' ) );

    #

    #   Insert size of the FullFS

    #   May be zero

    #

    $partitions{0}{size} = $fullfs;

    #

    #

    #   Magic: The size of the SD card

    #          This was determined by 'dd' ing an SD card and using the number of

    #          blocks that could be extracted.

    #

    my $disk_sectors = $disk_blocks * 2;

    $image_name .= '.raw';

    my $disk_image = "$BUILD/$image_name";

    my $pr_size = 20 * 2;                       # Sectors for a partition table

    #

    #   Determine partition start and end sectors

    #   Work in sectors

    #

    my  $pstart = $pr_size;

    my  $in_extended = 0;

    Message ("Calculate partition sizes");

    foreach my $partition ( sort keys %partitions )

    {

        my $pdata = $partitions{$partition};

        my $rest = 0;

        unless ($partition )

        {

            $pdata->{size} *= 2;

            next;

        }

        if (  exists $pdata->{type} && $pdata->{type} eq 'extended' )

        {

            $pdata->{start} = $pstart;

            $pdata->{end} =   $disk_sectors;

            $pdata->{size} = ($disk_sectors - $pstart);

            $pdata->{id} = 5;

            $in_extended = 1;

        }

        else

        {

            Error ("Partition Table setup. The 'rest' keyword must only be used on the last partition") if ( $rest );

            $pdata->{type} = 'Linux';

            $pdata->{id} = 83;

            $pstart += $pr_size if ( $in_extended );

            if ( $pdata->{size} eq 'rest' )

            {

                Error ("Partition Table setup. The 'rest' keyword can only be used once") if ( $rest );

                $pdata->{size} = ($disk_sectors - $pstart) / 2048;

                $rest = 1;

            }

            $pdata->{start} = $pstart;

            $pdata->{end} =   $pstart + ( $pdata->{size} * 1024 * 2);

            $pdata->{size} =  $pdata->{end} - $pdata->{start};

            $pstart = $pdata->{end};

        }

    }

    #

    #   Display calculated partition sizes

    #

    foreach my $partition ( sort keys %partitions )

    {

        next unless ( $partition );

        my $pdata = $partitions{$partition};

        my $name = $pdata->{name} || "";

        printf "Partition-%d (%10s): Sector Start=%10d, End=%10d, Sector Size=%10d(~%5dM), Id=%s\n",

                    $partition,

                    $name,

                    $pdata->{start},

                    $pdata->{end},

                    $pdata->{size},

                    $pdata->{size}/2/1024,

                    $pdata->{id};

    }

    Message ("Creating Empty SD Image");

    System ('dd', 'if=/dev/zero', "of=$disk_image", 'bs=1024', "count=$disk_blocks" );

    Message ("Creating Partition Table");

    open (SFDISK, "| /sbin/sfdisk  -f -L $disk_image" ) || Error ("Cannot invoke sfdisk");

    print SFDISK "unit: sectors\n\n";

    foreach my $partition ( sort keys %partitions )

    {

        next unless ( $partition );

        my $pdata = $partitions{$partition};

        printf SFDISK "Partition-%d: start=%10d, size=%10d, Id=%s\n",

                    $partition,

                    $pdata->{start},

                    $pdata->{size},

                    $pdata->{id};

    }

    close (SFDISK);

    ################################################################################

    #

    #   Split the complete file system image into required partitions

    #   Once the partition has been created it will be removed from the image

    #   What is left is the root file system - the final partition

    #

    #   Note: Size values are taken after the SD card has been partitioned

    #         The partioning process wants to place partitions on cylinder

    #         boundaries. This is why the number are not nice powers of two or 10

    #

    #         Partition logic:

    #           P1 root        - 30Meg

    #           P2 log         - 20Meg              Mounted as /var/log)

    #           P3 afc         - 150Meg

    #           P4 var         - Rest (~290 Meg)

    #

    #

    #   Note: Order is important, as dir tree will be pruned

    #         Be smart and determine order to create_fs

    #

    foreach my $partition ( CalcPartitionOrder() )

    {

        create_fs ($WORK, $BUILD, $partition);

    }

    #

    #   Insert the images into the SD image

    #

    foreach my $partition ( sort keys %partitions )

    {

        next unless ( $partition );

        my $pdata = $partitions{$partition};

        next unless ( defined $pdata->{fsname} );

        Message ("Insert filesystem $pdata->{name} into SD Image");

        my $cmd = "dd if=$pdata->{fsname} of=$disk_image bs=512 conv=notrunc seek=$pdata->{start} count=$pdata->{size}";

        System ($cmd);

    }

    ################################################################################

    #   

    #   Install grub into the MBR of the file system [ optional]

    #   This is only required for an x86 target and will detected by the

    #   presence of a key grub file

    #   The grub files will have been copied into the filesystem image earlier

    #

    if ( $install_grub )

    {

        Message ("Installing Grub into the MBR");

        #

        #   Need to run a copy of grab (built for the build machine) on the image

        #

        #   Need a command file to feed into grub

        #   Prevent grub from scanning bios

        #

        my $map_file = "$BUILD/device_map";

        open (GRUB, ">$map_file" ) || Error ("Cannot create grub device map file: $map_file");

        print GRUB "(hd0) $disk_image\n";

        close (GRUB);

        #

        #   Run grub and pipe in commands

        #

        open (GRUB, "| grub  --device-map=$map_file --batch" ) || Error ("Cannot invoke GRUB");

        print GRUB "device (hd0) $disk_image\n";

        print GRUB "root (hd0,0)\n";

        print GRUB "setup (hd0)\n";

        close (GRUB);

        #

        #   Cleanup temp files

        #

        unlink $map_file;

    }

    ################################################################################

    #

    #   Package up the file system images

    #   Transfer the required build artifacts directly into the package

    #

    #   This images are large. They are stored in a gzip form to compress them

    #

    #   Output to disk as:

    #       gunzip -c rootfs.ext3.gz | dd  of=/dev/sdb1 bs=10K

    #

    mkpath( $outdir, 0, 0775);

    Message ("Package up the (compressed) filesystem images");

    my %package_list;

    #

    #   Complete image

    #

    my $ofile = "$outdir/${image_name}.gz";

    $package_list{$ofile}{type} = 'image';

    System ("gzip -c $disk_image > $ofile");

#    #

#    #   Create test images of the internal partitions

#    #

#    mkpath( "$outdir/test", 0, 0775);

#    foreach my $partition ( sort keys %partitions )

#    {

#        my $pdata = $partitions{$partition};

#        next unless ( defined $pdata->{fsname} );

#

#        my $file = $pdata->{fsname} ;

#        my $ofile = StripDir($file) ;

#        $ofile = "$outdir/test/${ofile}.gz";

#        $package_list{$ofile}{type} = 'ext3';

#        $package_list{$ofile}{partition} = $partition;

#        System ("gzip -c $file > $ofile");

#    }

#

    #

    #   Useful information for testing

    #

    Message ("Useful load commands for testing");

    foreach my $entry ( sort keys %package_list )

    {

        next unless ( defined $package_list{$entry}{partition} );

        my $ifname = AbsPath( $entry );

        my $ofname = "/dev/sdb" . $package_list{$entry}{partition} ;

        my $cmd = "gunzip -c $ifname | dd bs=1M of=$ofname";

        Message $cmd;

    }

    foreach my $entry ( sort keys %package_list )

    {

        next if ( defined $package_list{$entry}{partition} );

        my $ifname = AbsPath( $entry );

        my $ofname = "/dev/sdb";

        my $cmd = "gunzip -c $ifname | dd bs=1M of=$ofname";

        Message $cmd;

    }

}

#-------------------------------------------------------------------------------

# Function        : create_fs

#

# Description     : Create the ext3 image of a given partition

#

# Inputs          : $WORK               - Root of data

#                   $BUILD              - Scratch Area

#                   $FS_PART            - Partition number

#

# Returns         : 

#

sub create_fs

{

    my ($WORK, $BUILD, $FS_PART) = @_;

    my $pdata = $partitions{$FS_PART} || Error ("Unknown partition number: $FS_PART");

    my $FS_IMAGE = $pdata->{name};

    my $FS_BASE =  $pdata->{root};

    my $FS_SIZE = $pdata->{size} / 2;

    #

    #   The 'full' image may not be required

    #   It will have a zero size

    #

    return unless ( $FS_SIZE );

    Message "Creating EXT3 file system: ${FS_IMAGE}, Partition: ${FS_PART}, Size: ${FS_SIZE} blocks";

    $FS_IMAGE = "${BUILD}/${FS_IMAGE}.ext3";

    $pdata->{fsname} = $FS_IMAGE;

    unlink ${FS_IMAGE};

    my $cmd = "e2fsimage -f ${FS_IMAGE} -d ${WORK}${FS_BASE} -u 0 -g 0 -s ${FS_SIZE}";

    $cmd .= " -v " if ( IsVerbose(1) );

    Verbose $cmd;

    open (E2FSIMAGE, "$cmd |" ) || Error ("Can't invoke e2fsimage");

    while ( <E2FSIMAGE> )

    {

        chomp;

        Verbose ("          $_");

    }

    close (E2FSIMAGE);

    $cmd = "/sbin/tune2fs -j -c 10 -i 5d ${FS_IMAGE}";

    Verbose $cmd;

    open (E2FSIMAGE, "$cmd |" ) || Error ("Can't invoke tunefs");

    while ( <E2FSIMAGE> )

    {

        chomp;

        Verbose ("          $_");

    }

    close (E2FSIMAGE);

    #

    #   Clean the subtree that has been encapsulated in the partition

    #   Leave the mountpoint

    #

    unless ( $pdata->{noprune} )

    {

        Verbose ("Cleaning partition data - leave mount point", $pdata->{root});

        foreach my $file ( glob("${WORK}/${FS_BASE}/*") )

        {

            if ( -d $file )

            {

                rmtree( $file );

            }

            else

            {

                unlink ($file);

            }

        }

    }

}

#-------------------------------------------------------------------------------

# Function        : CalcPartitionOrder

#

# Description     :  Determine the order in which we need to create the partitions

#                    Simple: if 'A' is a subset of 'B' then 'A' must be done first

#

# Inputs          :

#

# Returns         : 

#

sub CalcPartitionOrder

{

    my %pdata;

    my @porder;

    #

    #   Examine all partitions

    #   Partition-0: process first, don't prune

    #   Ignore extended partions. The only affect the partition  table

    #

    foreach my $partition ( sort keys %partitions )

    {

        if ( $partition == 0 )

        {

            push @porder, $partition;

            $partitions{$partition}{noprune} = 1;

            next;

        }

        next if ( ($partitions{$partition}{type} || '') eq 'extended'  );

        $pdata{$partitions{$partition}{root}} = $partition;

    }

    #

    #   Now we have the names of the partions

    #   Reverse Order

    #

    foreach my $name ( reverse sort keys %pdata )

    {

        push @porder, $pdata{$name};

    }

    #

    #   Mark the last partition as non-prune

    #

    my $last = $porder[$#porder];

    $partitions{$last}{noprune} = 1;

    #

    #   Return the order in which partitions MUST be pruned

    #

    return @porder;

}