mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-01 01:04:04 +02:00
77c8c4e32c
git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@4808 3c298f89-4303-0410-b956-a3cf2f4a3e73
73 lines
2.2 KiB
Plaintext
73 lines
2.2 KiB
Plaintext
== Structure of the configuration files ==
|
|
|
|
The config files are divided into sections and options/values.
|
|
|
|
Every section has a type, but does not necessarily have a name.
|
|
Every option has a name and a value and is assigned to the section
|
|
it was written under.
|
|
|
|
Syntax:
|
|
|
|
config <type> [<name>] # Section
|
|
option <name> <value> # Option
|
|
|
|
|
|
Every parameter needs to be a single string and is formatted exactly
|
|
like a parameter for a shell function. The same rules for Quoting and
|
|
special characters also apply, as it is parsed by the shell.
|
|
|
|
|
|
|
|
== Parsing configuration files in custom scripts ==
|
|
|
|
To be able to load configuration files, you need to include the common
|
|
functions with:
|
|
|
|
. /etc/functions.sh
|
|
|
|
Then you can use config_load <name> to load config files. The function
|
|
first checks for <name> as absolute filename and falls back to loading
|
|
it from /etc/config (which is the most common way of using it).
|
|
|
|
If you want to use special callbacks for sections and/or options, you
|
|
need to define the following shell functions before running config_load
|
|
(after including /etc/functions.sh):
|
|
|
|
config_cb() {
|
|
local type="$1"
|
|
local name="$2"
|
|
# commands to be run for every section
|
|
}
|
|
|
|
option_cb() {
|
|
# commands to be run for every option
|
|
}
|
|
|
|
You can also alter option_cb from config_cb based on the section type.
|
|
This allows you to process every single config section based on its type
|
|
individually.
|
|
|
|
config_cb is run every time a new section starts (before options are being
|
|
processed). You can access the last section through the CONFIG_SECTION
|
|
variable. Also an extra call to config_cb (without a new section) is generated
|
|
after config_load is done.
|
|
That allows you to process sections both before and after all options were
|
|
processed.
|
|
|
|
You can access already processed options with the config_get command
|
|
Syntax:
|
|
|
|
config_get <section> <option> # prints the value of the option
|
|
config_get <variable> <section> <option> # stores the value inside the variable
|
|
|
|
In busybox ash the three-option config_get is faster, because it does not
|
|
result in an extra fork, so it is the preferred way.
|
|
|
|
Additionally you can also modify or add options to sections by using the
|
|
config_set command.
|
|
|
|
Syntax:
|
|
|
|
config_set <section> <option> <value>
|
|
|