134 lines
4.0 KiB
Bash
Executable File
134 lines
4.0 KiB
Bash
Executable File
#!/bin/sh
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# Create sparse file of 20MB which can be used by QEMU.
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if [ "$1" = "-e" -o "$1" = "--empty" ] ; then
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# Create new hard disk image file.
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rm -f hdd.img
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truncate -s 20M hdd.img
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echo "Created new hard disk image file 'hdd.img' with 20MB size."
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elif [ "$1" = "-f" -o "$1" = "--folder" ] ; then
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if [ ! "$(id -u)" = "0" ] ; then
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echo "Using option '-f' (or '--folder') requires root permissions."
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exit 1
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fi
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rm -f hdd.img
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truncate -s 20M hdd.img
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echo "Created new hard disk image file 'hdd.img' with 20MB size."
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LOOP_DEVICE=$(losetup -f)
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losetup $LOOP_DEVICE hdd.img
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echo "Attached hard disk image file to loop device."
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mkfs.ext2 $LOOP_DEVICE
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echo "Hard disk image file has been formatted with Ext2 filesystem."
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mkdir folder
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mount hdd.img folder
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echo "Mounted hard disk image file to temporary folder."
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mkdir -p folder/minimal/rootfs
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mkdir -p folder/minimal/work
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echo "Overlay structure has been created."
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echo "This file is on external hard disk." > folder/minimal/rootfs/overlay.txt
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echo "Created sample text file."
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umount folder
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rm -rf folder
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echo "Unmounted hard disk image file."
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losetup -d $LOOP_DEVICE
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echo "Detached hard disk image file from loop device."
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chown $(logname) hdd.img
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echo "Applied original ownership to hard disk image file."
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elif [ "$1" = "-s" -o "$1" = "--sparse" ] ; then
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if [ ! "$(id -u)" = "0" ] ; then
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echo "Using option '-s' (or '--sparse') requires root permissions."
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exit 1
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fi
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rm -f hdd.img
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truncate -s 20M hdd.img
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echo "Created new hard disk image file 'hdd.img' with 20MB size."
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LOOP_DEVICE_HDD=$(losetup -f)
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losetup $LOOP_DEVICE_HDD hdd.img
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echo "Attached hard disk image file to loop device."
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mkfs.vfat $LOOP_DEVICE_HDD
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echo "Hard disk image file has been formatted with FAT filesystem."
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mkdir sparse
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mount hdd.img sparse
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echo "Mounted hard disk image file to temporary folder."
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rm -f sparse/minimal.img
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truncate -s 1M sparse/minimal.img
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echo "Created new overlay image file with 1MB size."
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LOOP_DEVICE_OVL=$(losetup -f)
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losetup $LOOP_DEVICE_OVL sparse/minimal.img
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echo "Attached overlay image file to loop device."
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mkfs.ext2 $LOOP_DEVICE_OVL
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echo "Overlay image file has been formatted with Ext2 filesystem."
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mkdir ovl
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mount sparse/minimal.img ovl
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echo "Mounted overlay image file to temporary folder."
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mkdir -p ovl/rootfs
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mkdir -p ovl/work
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echo "Overlay structure has been created."
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echo "Create sample text file."
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echo "This file is on external hard disk." > ovl/rootfs/overlay.txt
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chown -R root:root ovl
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echo "Applied root ownership to overlay content."
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umount ovl
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sleep 1
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rm -rf ovl
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echo "Unmounted overlay image file."
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losetup -d $LOOP_DEVICE_OVL
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sleep 1
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echo "Overlay image file has been detached from loop device."
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umount sparse
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sleep 1
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rm -rf sparse
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echo "Unmounted hard disk image file."
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losetup -d $LOOP_DEVICE_HDD
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sleep 1
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echo "Hard disk image file has been detached from loop device."
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chown $(logname) hdd.img
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echo "Applied original ownership to hard disk image file."
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elif [ "$1" = "-h" -o "$1" = "--help" ] ; then
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cat << CEOF
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Usage: $0 [OPTION]
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This utility generates 20MB sparse file 'hdd.img' which can be used as QEMU
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disk image where all filesystem changes from the live session are persisted.
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-e, --empty Create empty sparse image file which is not formatted.
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-f, --folder Create sparse image file formatted with Ext2 filesystem which
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contains compatible overlay folder structure.
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-h, --help Prints this help information.
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-s, --sparse Create sparse image file formatted with FAT filesystem which
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contains sparse image file 'minimal.img' (1MB) formatted with
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Ext2 filesystem which contains the actual overlay structure.
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CEOF
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elif [ "$1" = "" ] ; then
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echo "No option specified. Use '-h' or '--help' for more info."
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else
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echo "Option '$1' is not recognized. Use '-h' or '--help' for more info."
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fi
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