This file is indexed.

/etc/default/opensm is in opensm 3.3.18-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Lists gid the ports to start opensm on.
# ibstat -p will list the gids on the system.
# You can also specify ALL or NONE
# ALL: Start opensm on all ports
# NONE: Do no start opensm

#PORTS="0x0002c9030002fce9 0x0002c9030002fb06"

PORTS=ALL