Difference between revisions of "Cloop"
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+ | = Introduction = | ||
+ | '''Cloop''', is a [[http://www.wikipedia.org/wiki/Kernel Kernel] (computers)] [[http://www.wikipedia.org/wiki/module module]] to add support for [[http://www.wikipedia.org/wiki/filesystem filesystem]-independent,] | ||
+ | transparently decompressed, read-only, block devices. | ||
+ | = Where to download = | ||
+ | [http://developer.linuxtag.net/knoppix/sources/ ] | ||
+ | Use version 1.xx if you have a 2.4 kernel, or version 2.xx for 2.6 kernel. Versions 0.xx are too old, probably won't work well. | ||
− | + | = Installation = | |
− | + | make KERNEL_DIR=/path/to/linux-kernel/sources | |
− | + | ||
− | + | Issue these commands as [[root]] | |
− | + | mkdir -p /lib/modules/misc && cp cloop.o /lib/modules/misc/ | |
− | + | depmod -a | |
− | + | mknod /dev/cloop b 240 0 | |
+ | |||
+ | = Usage = | ||
+ | |||
+ | == Creating a compressed image: == | ||
+ | |||
+ | create_compressed_fs image blocksize > image.cloop_compressed | ||
+ | |||
+ | Where | ||
+ | blocksize must be a multiple of 512 bytes. Make sure you have enough | ||
+ | swap to hold the entire compressed image in virtual memory! | ||
+ | |||
+ | The command may also be used in [[Linux]] [[command line]] pipe sequences. Use "-" as the image filename. The dash, "-" will cause the command to read data from stdin, as in | ||
+ | |||
+ | mkisofs -r datadir | create_compressed_fs - 65536 > datadir.iso.compressed | ||
+ | |||
+ | == Mounting a compressed image (see above for device creation): == | ||
+ | |||
+ | insmod cloop.o file=/path/to/compressed/image | ||
+ | |||
+ | [[mount]] -o ro -t whatever /dev/cloop /mnt/compressed | ||
+ | |||
+ | |||
+ | [[Category:Useful Linux Commands]] |
Revision as of 02:21, 17 September 2005
Contents
Introduction
Cloop, is a [Kernel (computers)] [module] to add support for [filesystem-independent,] transparently decompressed, read-only, block devices.
Where to download
Use version 1.xx if you have a 2.4 kernel, or version 2.xx for 2.6 kernel. Versions 0.xx are too old, probably won't work well.
Installation
make KERNEL_DIR=/path/to/linux-kernel/sources
Issue these commands as root
mkdir -p /lib/modules/misc && cp cloop.o /lib/modules/misc/ depmod -a mknod /dev/cloop b 240 0
Usage
Creating a compressed image:
create_compressed_fs image blocksize > image.cloop_compressed
Where blocksize must be a multiple of 512 bytes. Make sure you have enough swap to hold the entire compressed image in virtual memory!
The command may also be used in Linux command line pipe sequences. Use "-" as the image filename. The dash, "-" will cause the command to read data from stdin, as in
mkisofs -r datadir | create_compressed_fs - 65536 > datadir.iso.compressed
Mounting a compressed image (see above for device creation):
insmod cloop.o file=/path/to/compressed/image
mount -o ro -t whatever /dev/cloop /mnt/compressed