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75 lines
2.7 KiB
75 lines
2.7 KiB
4 months ago
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# Pseudo file example
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# Mksquashfs supports pseudo files, these allow fake files, directories,
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# character and block devices to be specified and added to the Squashfs
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# filesystem being built, rather than requiring them to be present in the
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# source directories.
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#
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# This, for example, allows device nodes to be added to the filesystem without
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# requiring root access.
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# Mksquashfs 4.1 adds support for "dynamic pseudo files" and a modify operation.
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# Dynamic pseudo files allow files to be dynamically created when Mksquashfs
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# is run, their contents being the result of running a command or piece of
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# shell script. The modifiy operation allows the mode/uid/gid of an existing
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# file in the source filesystem to be modified.
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# Two Mksquashfs options are supported, -p allows one pseudo file to be
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# specified #on the command line, and -pf allows a pseudo file to be specified
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# containing a list of pseduo definitions, one per line.
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# Pseudo file examples
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# Run mkquashfs . /tmp/img -pf pseudo-file.examples
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# to see their effect
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# Creating dynamic file examples
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# Create a file "dmesg" containing the output from dmesg.
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dmesg f 444 root root dmesg
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# Create a file RELEASE containing the release name, date, build host, and
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# an incrementing version number. The incrementing version is a side-effect
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# of executing the shell script, and ensures every time Mksquashfs is run a
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# new version number is used without requiring any other shell scripting.
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RELEASE f 444 root root \
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if [ ! -e /tmp/ver ]; then \
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echo 0 > /tmp/ver; \
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fi; \
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ver=`cat /tmp/ver`; \
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ver=$((ver +1)); \
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echo $ver > /tmp/ver; \
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echo -n "release x.x"; \
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echo "-dev #"$ver `date` "Build host" `hostname`
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# Copy 10K from the device /dev/sda1 into the file input. Ordinarily
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# Mksquashfs given a device, fifo, or named socket will place that special file
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# within the Squashfs filesystem, this allows input from these special
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# files to be captured and placed in the Squashfs filesystem.
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input f 444 root root dd if=/dev/sda1 bs=1024 count=10
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# Creating a block or character device examples
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# Create a character device "chr_dev" with major:minor 100:1 and
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# a block device "blk_dev" with major:minor 200:200, both with root
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# uid/gid and a mode of rw-rw-rw.
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chr_dev c 666 root root 100 1
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blk_dev b 666 0 0 200 200
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# Creating a directory example
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# create a directory "pseudo_dir" with root uid/gid and mode of r--r--r--.
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pseudo_dir d 444 root root
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# Modifying attributes of an existing file exmaple
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# Change the attributes of the file "INSTALL" in the filesystem to have
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# root uid/gid and a mode of rw-rw-rw, overriding the attributes obtained
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# from the source filesystem.
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INSTALL m 666 root root
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