[OpenWrt-Devel] [PATCH v3 2/2] base-files: rename hostname with EUI of mac address

[Adrian Schmutzler]

From: Rosy Song <rosys...@rosinson.com>

If a label MAC address is provided for device, system
will rename the hostname with OpenWrt_{eui mac address}.
This helps to distinguish between different devices.

Since it's no good idea to nest json_* functions, this code does
not use get_mac_label directly, but only get_mac_label_dt as
external resource.

Signed-off-by: Rosy Song <rosys...@rosinson.com>
[merged with commit introducing macaddr_geteui, rebased on updated
label MAC address storage, extended commit message]
Signed-off-by: Adrian Schmutzler <freif...@adrianschmutzler.de>
---
 package/base-files/files/bin/config_generate     | 16 +++++++++++++++-
 package/base-files/files/lib/functions/system.sh |  7 +++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/package/base-files/files/bin/config_generate 
b/package/base-files/files/bin/config_generate
index 3ca035ca8b..b473eba9e9 100755
--- a/package/base-files/files/bin/config_generate
+++ b/package/base-files/files/bin/config_generate
@@ -3,6 +3,7 @@
 CFG=/etc/board.json
 
 . /usr/share/libubox/jshn.sh
+. /lib/functions/system.sh
 
 [ -s $CFG ] || /bin/board_detect || exit 1
 [ -s /etc/config/network -a -s /etc/config/system ] && exit 0
@@ -253,9 +254,22 @@ generate_static_system() {
                add_list system.ntp.server='3.openwrt.pool.ntp.org'
        EOF
 
+       local label_macaddr=$(get_mac_label_dt)
+       local hostname
+
+       if json_is_a system object; then
+               json_select system
+                       [ -n "$label_macaddr" ] || json_get_var label_macaddr 
label_macaddr
+               json_select ..
+       fi
+
+       if [ -n "$label_macaddr" ]; then
+               hostname="OpenWrt-$(macaddr_geteui $label_macaddr)"
+               uci -q set "system.@system[-1].hostname=$hostname"
+       fi
+
        if json_is_a system object; then
                json_select system
-                       local hostname
                        if json_get_var hostname hostname; then
                                uci -q set 
"system.@system[-1].hostname=$hostname"
                        fi
diff --git a/package/base-files/files/lib/functions/system.sh 
b/package/base-files/files/lib/functions/system.sh
index be7efe4e2e..c4dc3cc3a9 100644
--- a/package/base-files/files/lib/functions/system.sh
+++ b/package/base-files/files/lib/functions/system.sh
@@ -144,6 +144,13 @@ macaddr_add() {
        echo $oui:$nic
 }
 
+macaddr_geteui() {
+       local mac=$1
+       local sep=$2
+
+       echo ${mac:9:2}$sep${mac:12:2}$sep${mac:15:2}
+}
+
 macaddr_setbit_la() {
        local mac=$1
 
-- 
2.20.1


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