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base-files: add function to retrieve label MAC address

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To refer to the MAC address on a device's label, one can
specify the alias label-mac-device in the DTS which should
point to the bearer of the corresponding MAC address.

With the function get_mac_label, the user can retrieve then
retrieve this address and use it as a value that uniquely
identifies his device.

This is severely helpful for several downstream functionalities,
e.g. define MAC addresses of custom netifs or change the SSID to
be easily recognizable.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
This commit is contained in:
Adrian Schmutzler 2019-08-15 15:13:21 +02:00 committed by Petr Štetiar
parent 71cf4a272c
commit 0340718863
1 changed files with 10 additions and 0 deletions
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10
package/base-files/files/lib/functions/system.sh
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@ -12,6 +12,16 @@ get_mac_binary() {
hexdump -v -n 6 -s $offset -e '5/1 "%02x:" 1/1 "%02x"' $path 2>/dev/null
}
get_mac_label() {
local basepath="/proc/device-tree"
local macdevice="$(cat "$basepath/aliases/label-mac-device" 2>/dev/null)"
local macaddr
[ -n "$macdevice" ] && macaddr=$(get_mac_binary "$basepath/$macdevice/mac-address" 0 2>/dev/null)
[ -n "$macaddr" ] || macaddr=$(get_mac_binary "$basepath/$macdevice/local-mac-address" 0 2>/dev/null)
echo $macaddr
}
find_mtd_chardev() {
local INDEX=$(find_mtd_index "$1")
local PREFIX=/dev/mtd