SQUASHFS 3.3 - A squashed read-only filesystem for Linux
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Copyright 2002-2007 Phillip Lougher <phillip@lougher.demon.co.uk>
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Released under the GPL licence (version 2 or later).
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Welcome to another release of Squashfs. This is the 22nd release in just
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over five years of work. Squashfs 3.3 has lots of nice improvements,
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both to the filesystem itself (bigger blocks, and sparse files), but
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also to the Squashfs-tools Mksquashfs and Unsquashfs. As usual the
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CHANGES file has a detailed list of all the improvements.
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Following is a description of the changes to the Squashfs tools, usage
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guides to the new options, and a summary of the new options.
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1. MKSQUASHFS - EXTENDED EXCLUDE FILE HANDLING
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----------------------------------------------
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1. Extended wildcard pattern matching now supported in exclude files
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Enabled by specifying -wildcards option
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Supports both anchored and non-anchored exclude files.
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1.1 Anchored excludes
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Similar to existing exclude files except with wildcards. Exclude
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file matches from root of source directories.
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Examples:
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1. mksquashfs example image.sqsh -wildcards -e 'test/*.gz'
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Exclude all files matching "*.gz" in the top level directory "test".
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2. mksquashfs example image.sqsh -wildcards -e '*/[Tt]est/example*'
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Exclude all files beginning with "example" inside directories called
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"Test" or "test", that occur inside any top level directory.
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Using extended wildcards, negative matching is also possible.
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3. mksquashfs example image.sqsh -wildcards -e 'test/!(*data*).gz'
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Exclude all files matching "*.gz" in top level directory "test",
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except those with "data" in the name.
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1.2 Non-anchored excludes
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By default excludes match from the top level directory, but it is
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often useful to exclude a file matching anywhere in the source directories.
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For this non-anchored excludes can be used, specified by pre-fixing the
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exclude with "...".
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Examples:
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1. mksquashfs example image.sqsh -wildcards -e '... *.gz'
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Exclude files matching "*.gz" anywhere in the source directories.
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For example this will match "example.gz", "test/example.gz", and
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"test/test/example.gz".
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2. mksquashfs example image.sqsh -wildcards -e '... [Tt]est/*.gz'
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Exclude files matching "*.gz" inside directories called "Test" or
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"test" that occur anywhere in the source directories.
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Again, using extended wildcards, negative matching is also possible.
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3. mksquashfs example image.sqsh -wildcards -e '... !(*data*).gz'
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Exclude all files matching "*.gz" anywhere in the source directories,
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except those with "data" in the name.
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2. Regular expression pattern matching now supported in exclude files
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Enabled by specifying -regex option. Identical behaviour to wild
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card pattern matching, except patterns are considered to be regular
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expressions.
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Supports both anchored and non-anchored exclude files.
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2. MKSQUASHFS - NEW RECOVERY FILE FEATURE
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-----------------------------------------
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Recovery files are now created when appending to existing Squashfs
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filesystems. This allows the original filesystem to be recovered
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if Mksquashfs aborts unexpectedly (i.e. power failure).
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The recovery files are called squashfs_recovery_xxx_yyy, where
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"xxx" is the name of the filesystem being appended to, and "yyy" is a
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number to guarantee filename uniqueness (the PID of the parent Mksquashfs
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process).
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Normally if Mksquashfs exits correctly the recovery file is deleted to
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avoid cluttering the filesystem. If Mksquashfs aborts, the "-recover"
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option can be used to recover the filesystem, giving the previously
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created recovery file as a parameter, i.e.
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mksquashfs dummy image.sqsh -recover squashfs_recovery_image.sqsh_1234
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The writing of the recovery file can be disabled by specifying the
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"-no-recovery" option.
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3. UNSQUASHFS - EXTENDED EXTRACT FILE HANDLING
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----------------------------------------------
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1. Multiple extract files can now be specified on the command line, and the
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files/directories to be extracted can now also be given in a file.
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To specify a file containing the extract files use the "-e[f]" option.
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2. Extended wildcard pattern matching now supported in extract files
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Enabled by default. Similar to existing extract files except with
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wildcards.
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Examples:
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1. unsquashfs image.sqsh 'test/*.gz'
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Extract all files matching "*.gz" in the top level directory "test".
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2. unsquashfs image.sqsh '[Tt]est/example*'
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Extract all files beginning with "example" inside top level directories
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called "Test" or "test".
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Using extended wildcards, negative matching is also possible.
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3. unsquashfs image.sqsh 'test/!(*data*).gz'
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Extract all files matching "*.gz" in top level directory "test",
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except those with "data" in the name.
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3. Regular expression pattern matching now supported in extract files
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Enabled by specifying -r[egex] option. Identical behaviour to wild
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card pattern matching, except patterns are considered to be regular
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expressions.
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4. UNSQUASHFS - EXTENDED FILENAME PRINTING
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------------------------------------------
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Filename printing has been enhanced and Unquashfs can now display filenames
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with file attributes ('ls -l' style output).
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New options:
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-ll[s]
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list filesystem with file attributes, but don't unsquash
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-li[nfo]
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print files as they are unsquashed with file attributes
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5. UNSQUASHFS - MISCELLANEOUS OPTIONS
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-------------------------------------
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-s[tat]
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Display the filesystem superblock information. This is useful to
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discover the filesystem version, byte ordering, whether it has an
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NFS export table, and what options were used to compress
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the filesystem.
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