source: soft/giet_vm/create_dmg @ 407

#!/bin/bash

# Author: Cesar FUGUET

# Date  : Novembre 2013



clusters=65536

sector_size=512

sectors_per_cluster=8

reserved_sectors=2048



# FAT32 SPEC: The first two clusters are not present in the data region but

# they are used in the computation of the FAT sectors

data_region_clusters=$clusters-2



let "data_sectors = data_region_clusters * sectors_per_cluster"

let "fat_sectors  = (clusters * 4) / 512"



# The disk image contains:

#   - MBR sector : this sector is removed by this script as it will be copied

#                  after)

#   - Reserved region sectors (usually 32)

#   - FAT region sectors

#   - DATA region sectors

let "sectors      = data_sectors + fat_sectors + reserved_sectors + 1" 



platform=`uname`

echo "Detected platform: $platform"



if [[ $platform == "Darwin" ]]; then

        case $1 in

                create )

                        # Create disk image

                        # -fs        <fs>   : use filesystem <fs>

                        # -volname   <name> : use volume name <name>

                        # -srcfolder <src>  : copy every file in <src> into image

                        # -format    <fmt>  : format of image. UDRW (UDIF read/write image)

                        # -sectors   <sect> : size of image in 512-byte sectors

                        # -ov                           : overwrite existing image file

                        # -fargs         <args> : additional args to pass to newfs program 

                        #                            -F : FAT type (FAT32)

                        #                                -c : sector per cluster

                        #                                -n : number of FAT



                        if [[ -z $2 ]]; then

                                echo "Create action need second argument: <disk_image>"

                                exit 1;

                        fi;



                        # -F FAT type = 32 (FAT32)

                        # -c sectors/cluster

                        # -n number of FATs

                        # -r reserved sectors

                        # -k backup boot sector (VBR and FS INFO) = 0xffff (no backup)

                        echo "Creating empty disk image: $2.dmg"

                        fsargs="-F32 -c $sectors_per_cluster -n 1 -r $reserved_sectors -k 0xffff"



                        # -layout = NONE (No partition scheme. Hence no Master Boot Record)

                        hdiutil create \

                                -fs MS-DOS \

                                -volname virtualdisk \

                                -layout NONE \

                                -sectors $sectors \

                                -ov \

                                -fsargs "$fsargs" \

                                -type "UDIF" \

                                $2; 

                        ;;



                attach )

                        # Attach created disk image to the system and mount it

                        hdiutil attach $2

                        ;;



                detach )

                        # Detach attached device. Must pass as parameter the /dev/<device>

                        hdiutil detach $2

                        ;;



                info )

                        hdiutil imageinfo $2

                        ;;



                * )

                        echo "Pass the command as the first parameter: "

                        echo "  - create: create disk image"

                        echo "  - attach: attach created disk image to the system and "

                        echo "            mount it (arg: path to disk_image)"

                        echo "  - detach: detach specified device "

                        echo "            (arg: path to /dev/<device>)"

                        echo "  - info  : print information about created disk image"

                        echo "            (arg: path to disk_image)"

                        echo ""

                        echo "EXAMPLES:"

                        echo " ./create_diskimage.sh create disk_image"

                        echo " ./create_diskimage.sh attach /path/to/disk_image.dmg"

                        echo " ./create_diskimage.sh detach /dev/disk5"

                        echo " ./create_diskimage.sh info   /path/to/disk_image.dmg"

                        ;;

        esac;



elif [[ $platform == "Linux" ]]; then

        case $1 in

                create )



                        if [[ -z $2 ]]; then

                                echo "Create action need second argument: <disk_image>"

                                exit 1;

                        fi;



                        echo "Creating empty disk image: $2"



                        let "sectors = (sectors - 1) / 2" 

                    mkfs.vfat \

                                -C \

                                -F32 \

                                -f 1 \

                                -R $reserved_sectors \

                                -S $sector_size \

                                -s $sectors_per_cluster \

                                -v \

                                $2.dmg $sectors

                        ;;



                * )

                        echo "Pass the command as the first parameter: "

                        echo "  - create: create disk image"

                        echo ""

                        echo "EXAMPLES:"

                        echo " ./create_diskimage.sh create disk_image"

                        ;;

        esac;



else

        echo "Your platform is not supported: $platform"

fi;