Wrong network interface name if the name is long

[hellodword]

Describe the bug

network interface name get truncated with ifconfig

To reproduce

$ ip link show up
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
3: nameislong: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000

$ ifconfig 
lo        Link encap:Local Loopback
eth0      Link encap:Ethernet
nameislongLink encap:(hwtype unknown)

bash-completion/bash_completion

Lines 1723 to 1738 in 2b7fc19

	_comp_compgen_available_interfaces()
	{
	local PATH=$PATH:/sbin
	local generated
	_comp_compgen -v generated split -- "$({
	if [[ ${1-} == -w ]]; then
	iwconfig
	elif [[ ${1-} == -a ]]; then
	ifconfig || ip -c=never link show up || ip link show up
	else
	ifconfig -a || ip -c=never link show || ip link show
	fi
	} 2>/dev/null | _comp_awk \
	'/^[^ \t]/ { if ($1 ~ /^[0-9]+:/) { print $2 } else { print $1 } }')" &&
	_comp_compgen -U generated set "${generated[@]}"
	}

Then the _comp_compgen_available_interfaces -a will return nameislongLink instead of nameislong

Reproduce:

sudo tunctl -t nameislong
sudo ip addr add 10.23.45.0/24 dev nameislong
sudo ip link set dev  nameislong up

# TAB
curl --interface nameis

Expected behavior

Versions (please complete the following information)

• Operating system name/distribution and version: NixOS 24.05.20240102.bd645e8
• bash version, echo "$BASH_VERSION": 5.2.21(1)-release
• bash-completion version, (IFS=.; echo "${BASH_COMPLETION_VERSINFO[*]}"): 2.11

Additional context

It's bug of upstream inetutils, but maybe we can simply use iproute2 as default choose

ip -c=never link show up || ip link show up || ifconfig

bash-completion/bash_completion

Lines 1731 to 1733 in 2b7fc19

	ifconfig || ip -c=never link show up || ip link show up
	else
	ifconfig -a || ip -c=never link show || ip link show