53 lines
1.3 KiB
Plaintext
53 lines
1.3 KiB
Plaintext
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#!/bin/sh
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# Example script called by Mender agent to collect device identity data. The
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# script needs to be located at
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# $(datadir)/mender/identity/mender-device-identity path for the agent to find
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# it. The script shall exit with non-0 status on errors. In this case the agent
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# will discard any output the script may have produced.
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#
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# The script shall output identity data in <key>=<value> format, one
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# entry per line. Example
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#
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# $ ./mender-device-identity
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# mac=de:ad:ca:fe:00:01
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# cpuid=1112233
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#
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# The example script collects the MAC address of a network interface with the
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# type ARPHRD_ETHER and it will pick the interface with the lowest ifindex
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# number if there are multiple interfaces with that type. The identity data is
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# output in the following format:
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#
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# mac=00:01:02:03:04:05
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#
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set -ue
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SCN=/sys/class/net
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min=65535
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arphrd_ether=1
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ifdev=
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# find iface with lowest ifindex, skip non ARPHRD_ETHER types (lo, sit ...)
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for dev in $SCN/*; do
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iftype=$(cat $dev/type)
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if [ $iftype -ne $arphrd_ether ]; then
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continue
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fi
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idx=$(cat $dev/ifindex)
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if [ $idx -lt $min ]; then
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min=$idx
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ifdev=$dev
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fi
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done
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if [ -z "$ifdev" ]; then
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echo "no suitable interfaces found" >&2
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exit 1
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else
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echo "using interface $ifdev" >&2
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# grab MAC address
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echo "mac=$(cat $ifdev/address)"
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fi
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