68cb6a88c1
This patch adds the documentation for the new makedevs recursive syntax. [Thomas: s/folder/directory/ as suggested by Yann.] Signed-off-by: Angelo Compagnucci <angelo.compagnucci@gmail.com> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
67 lines
1.9 KiB
Plaintext
67 lines
1.9 KiB
Plaintext
// -*- mode:doc; -*-
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// vim: set syntax=asciidoc:
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[[makedev-syntax]]
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== Makedev syntax documentation
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The makedev syntax is used in several places in Buildroot to
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define changes to be made for permissions, or which device files to
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create and how to create them, in order to avoid calls to mknod.
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This syntax is derived from the makedev utility, and more complete
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documentation can be found in the +package/makedevs/README+ file.
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It takes the form of a space separated list of fields, one file per
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line; the fields are:
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|===========================================================
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|name |type |mode |uid |gid |major |minor |start |inc |count
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|===========================================================
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There are a few non-trivial blocks:
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- +name+ is the path to the file you want to create/modify
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- +type+ is the type of the file, being one of:
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* f: a regular file
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* d: a directory
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* r: a directory recursively
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* c: a character device file
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* b: a block device file
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* p: a named pipe
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- +mode+, +uid+ and +gid+ are the usual permissions settings
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- +major+ and +minor+ are here for device files - set to - for other
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files
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- +start+, +inc+ and +count+ are for when you want to create a batch
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of files, and can be reduced to a loop, beginning at +start+,
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incrementing its counter by +inc+ until it reaches +count+
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Let's say you want to change the permissions of a given file; using
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this syntax, you will need to put:
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----
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/usr/bin/foobar f 644 0 0 - - - - -
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----
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Alternatively, if you want to change owner/permission of a directory
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recursively, you can put:
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----
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/usr/share/myapp r 750 myuser myuser - - - - -
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----
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On the other hand, if you want to create the device file +/dev/hda+
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and the corresponding 15 files for the partitions, you will need for
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+/dev/hda+:
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----
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/dev/hda b 640 0 0 3 0 0 0 -
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----
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and then for device files corresponding to the partitions of
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+/dev/hda+, +/dev/hdaX+, +X+ ranging from 1 to 15:
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----
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/dev/hda b 640 0 0 3 1 1 1 15
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----
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