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mkuzip (8)
>> mkuzip (8) ( FreeBSD man: Команды системного администрирования )
BSD mandoc
NAME
mkuzip
- compress disk image for use with
geom_uzip4
class
SYNOPSIS
[-v
]
[-o outfile
]
[-s cluster_size
]
infile
DESCRIPTION
The
utility compresses a disk image file so that the
geom_uzip4
class will be able to decompress the resulting image at run-time.
This allows for a significant reduction of size of disk image at
the expense of some CPU time required to decompress the data each
time it is read.
The
utility
works in two phases:
An
infile
image is split into clusters; each cluster is compressed using
zlib(3).
The resulting set of compressed clusters along with headers that allow
locating each individual cluster is written to the output file.
The options are:
-o outfile
Name of the output file
outfile
The default is to use the input name with the suffix
.uzip
-s cluster_size
Split the image into clusters of
cluster_size
bytes, 16384 bytes by default.
The
cluster_size
should be a multiple of 512 bytes.
-v
Display verbose messages.
NOTES
The compression ratio largely depends on the cluster size used.
For large cluster sizes (16K and higher), typical compression ratios
are only 1-2% less than those achieved with
gzip(1).
However, it should be kept in mind that larger cluster
sizes lead to higher overhead in the
geom_uzip4
class, as the class has to decompress the whole cluster even if
only a few bytes from that cluster have to be read.
The
utility
inserts a short shell script at the beginning of the generated image,
which makes it possible to
``run''
the image just like any other shell script.
The script tries to load the
geom_uzip4
class if it is not loaded, configure the image as an
md(4)
disk device using
mdconfig(8),
and automatically mount it using
mount_cd96608
on the mount point provided as the first argument to the script.
