/usr/lib/dracut/modules.d/40network/parse-ifname.sh is in dracut-network 040+1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | #!/bin/sh
#
# Format:
# ifname=<interface>:<mac>
#
# Note letters in the macaddress must be lowercase!
#
# Examples:
# ifname=eth0:4a:3f:4c:04:f8:d7
#
# Note when using ifname= to get persistent interface names, you must specify
# an ifname= argument for each interface used in an ip= or fcoe= argument
# check if there are any ifname parameters
if ! getarg ifname= >/dev/null ; then
return
fi
command -v parse_ifname_opts >/dev/null || . /lib/net-lib.sh
# Check ifname= lines
for p in $(getargs ifname=); do
parse_ifname_opts $p
done
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