2014-09-18 21:39:29 +02:00
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// -*- mode:doc; -*-
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// vim: set syntax=asciidoc:
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[[customize-device-permission]]
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==== Setting file permissions and ownership and adding custom devices nodes
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Sometimes it is needed to set specific permissions or ownership on files
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or device nodes. For example, certain files may need to be owned by
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2014-12-19 08:12:33 +01:00
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root. Since the post-build scripts are not run as root, you cannot do
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2014-09-18 21:39:29 +02:00
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such changes from there unless you use an explicit fakeroot from the
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post-build script.
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Instead, Buildroot provides support for so-called _permission tables_.
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To use this feature, set config option +BR2_ROOTFS_DEVICE_TABLE+ to a
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space-separated list of permission tables, regular text files following
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the xref:makedev-syntax[makedev syntax].
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If you are using a static device table (i.e. not using +devtmpfs+,
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+mdev+, or +(e)udev+) then you can add device nodes using the same
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syntax, in so-called _device tables_. To use this feature, set config
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option +BR2_ROOTFS_STATIC_DEVICE_TABLE+ to a space-separated list of
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device tables.
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As shown in xref:customize-dir-structure[], the recommended location for
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such files is +board/<company>/<boardname>/+.
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It should be noted that if the specific permissions or device nodes are
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related to a specific application, you should set variables
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+FOO_PERMISSIONS+ and +FOO_DEVICES+ in the package's +.mk+ file instead
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(see xref:generic-package-reference[]).
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