mksquashfs(1)

NAME

   mksquashfs - tool to create and append to squashfs filesystems

SYNOPSIS

   mksquashfs SOURCE [SOURCE2 ...] DESTINATION [OPTIONS]

DESCRIPTION

   Squashfs is a highly compressed read-only filesystem for Linux. It uses
   zlib compression to compress both files, inodes and directories. Inodes
   in the system are very small and all blocks are packed to minimize data
   overhead. Block sizes greater than 4K are supported up to a maximum  of
   64K.

   Squashfs is intended for general read-only filesystem use, for archival
   use (i.e.  in  cases  where  a  .tar.gz  file  may  be  used),  and  in
   constrained  block  device/memory systems (e.g. embedded systems) where
   low overhead is needed.

OPTIONS

   Filesystem build options
   -comp COMPRESSION
       select  COMPRESSION  compression.   Compressors   available:   gzip
       (default), lzo, xz.

   -b BLOCK_SIZE
       set data block to BLOCK_SIZE. Default 131072 bytes.

   -no-exports
       don't make the filesystem exportable via NFS.

   -no-sparse
       don't detect sparse files.

   -no-xattrs
       don't store extended attributes.

   -xattrs
       store extended attributes (default).

   -noI
       do not compress inode table.

   -noD
       do not compress data blocks.

   -noF
       do not compress fragment blocks.

   -noX
       do not compress extended attributes.

   -no-fragments
       do not use fragments.

   -always-use-fragments
       use fragment blocks for files larger than block size.

   -no-duplicates
       do not perform duplicate checking.

   -all-root
       make all files owned by root.

   -force-uid uid
       set all file uids to uid.

   -force-gid gid
       set all file gids to gid.

   -nopad
       do not pad filesystem to a multiple of 4K.

   -keep-as-directory
       if  one  source  directory  is  specified,  create a root directory
       containing  that  directory,  rather  than  the  contents  of   the
       directory.

   Filesystem filter options
   -p PSEUDO_DEFINITION
       Add pseudo file definition.

   -pf PSEUDO_FILE
       Add list of pseudo file definitions.

   -sort SORT_FILE
       sort  files  according  to priorities in SORT_FILE. One file or dir
       with priority per line. Priority -32768 to 32767, default  priority
       0.

   -ef EXCLUDE_FILE
       list of exclude dirs/files. One per line.

   -wildcards
       Allow  extended  shell  wildcards  (globbing) to be used in exclude
       dirs/files

   -regex
       Allow POSIX regular expressions to be used in exclude dirs/files.

   Filesystem append options
   -noappend
       do not append to existing filesystem.

   -root-becomes NAME
       when appending source files/directories,  make  the  original  root
       become  a  subdirectory  in  the  new root called NAME, rather than
       adding the new source items to the original root.

   Mksquashfs runtime options:
   -version
       print version, licence and copyright message.

   -recover NAME
       recover filesystem data using recovery file NAME.

   -no-recovery
       don't generate a recovery file.

   -info
       print files written to filesystem.

   -no-progress
       don't display the progress bar.

   -processors NUMBER
       Use NUMBER processors. By default will  use  number  of  processors
       available.

   -read-queue SIZE
       Set input queue to SIZE Mbytes. Default 64 Mbytes.

   -write-queue SIZE
       Set output queue to SIZE Mbytes. Default 512 Mbytes.

   -fragment-queue SIZE
       Set fragment queue to SIZE Mbytes. Default 64 Mbytes.

   Miscellaneous options
   -root-owned
       alternative name for -all-root.

   -noInodeCompression
       alternative name for -noI.

   -noDataCompression
       alternative name for -noD.

   -noFragmentCompression
       alternative name for -noF.

   -noXattrCompression
       alternative name for -noX.

   Compressors available and compressor specific options
   gzip (no options) (default)

   lzo (no options)

   xz

   -Xbcj filter1,filter2,...,filterN
       Compress  using filter1,filter2,...,filterN in turn (in addition to
       no filter), and choose the  best  compression.  Available  filters:
       x86, arm, armthumb, powerpc, sparc, ia64.

   -Xdict-size DICT_SIZE
       Use DICT_SIZE as the XZ dictionary size. The dictionary size can be
       specified as a percentage of the block  size,  or  as  an  absolute
       value.  The dictionary size must be less than or equal to the block
       size and 8192 bytes or larger. It must also be storable in  the  xz
       header as either 2^n or as 2^n+2^(n+1). Example dict-sizes are 75%,
       50%, 37.5%, 25%, or 32K, 16K, 8K etc.

SEE ALSO

   unsquashfs(1)

HOMEPAGE

   More information about mksquashfs and the squashfs  filesystem  can  be
   found at <http://squashfs.sourceforge.net/>.

AUTHOR

   squashfs was written by Phillip Lougher <[email protected]>.

   This     manual     page     was     written    by    Daniel    Baumann
   <[email protected]>.

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