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base-files: add function to get mac as text from flash

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Add a function to get a mac stored as text from flash. The octets of
the mac address need to be separated by any separator supported by
macaddr_canonicalize().

Signed-off-by: Dmitry Tunin <hanipouspilot@gmail.com>
Signed-off-by: Mathias Kresin <dev@kresin.me>
(backported from dfee452713e6b3c10aafc6174f8087a920b54402)
This commit is contained in:
Mathias Kresin 2018-08-11 10:10:21 +02:00 committed by Jo-Philipp Wich
parent 54278dfa69
commit d93bd72a98
1 changed files with 23 additions and 0 deletions
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23
package/base-files/files/lib/functions/system.sh
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@ -38,6 +38,29 @@ mtd_get_mac_ascii() {
[ -n "$mac_dirty" ] && macaddr_canonicalize "$mac_dirty"
}
mtd_get_mac_text() {
local mtdname=$1
local offset=$2
local part
local mac_dirty
part=$(find_mtd_part "$mtdname")
if [ -z "$part" ]; then
echo "mtd_get_mac_text: partition $mtdname not found!" >&2
return
fi
if [ -z "$offset" ]; then
echo "mtd_get_mac_text: offset missing!" >&2
return
fi
mac_dirty=$(dd if="$part" bs=1 skip="$offset" count=17 2>/dev/null)
# "canonicalize" mac
[ -n "$mac_dirty" ] && macaddr_canonicalize "$mac_dirty"
}
mtd_get_mac_binary() {
local mtdname="$1"
local offset="$2"