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Diffstat (limited to 'docs/manual/customize-device-permission-tables.txt')
| -rw-r--r-- | docs/manual/customize-device-permission-tables.txt | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/docs/manual/customize-device-permission-tables.txt b/docs/manual/customize-device-permission-tables.txt new file mode 100644 index 0000000000..99cf5bdd49 --- /dev/null +++ b/docs/manual/customize-device-permission-tables.txt @@ -0,0 +1,30 @@ +// -*- mode:doc; -*- +// vim: set syntax=asciidoc: + +[[customize-device-permission]] +==== Setting file permissions and ownership and adding custom devices nodes + +Sometimes it is needed to set specific permissions or ownership on files +or device nodes. For example, certain files may need to be owned by +root. Since the post-build scripts are not run as root, you cannot do +such changes from there unless you use an explicit fakeroot from the +post-build script. + +Instead, Buildroot provides support for so-called _permission tables_. +To use this feature, set config option +BR2_ROOTFS_DEVICE_TABLE+ to a +space-separated list of permission tables, regular text files following +the xref:makedev-syntax[makedev syntax]. + +If you are using a static device table (i.e. not using +devtmpfs+, ++mdev+, or +(e)udev+) then you can add device nodes using the same +syntax, in so-called _device tables_. To use this feature, set config +option +BR2_ROOTFS_STATIC_DEVICE_TABLE+ to a space-separated list of +device tables. + +As shown in xref:customize-dir-structure[], the recommended location for +such files is +board/<company>/<boardname>/+. + +It should be noted that if the specific permissions or device nodes are +related to a specific application, you should set variables ++FOO_PERMISSIONS+ and +FOO_DEVICES+ in the package's +.mk+ file instead +(see xref:generic-package-reference[]). |
