/lib/systemd/system/ifup@.service is in ifupdown 0.8.19.
This file is owned by root:root, with mode 0o644.
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 | [Unit]
Description=ifup for %I
After=local-fs.target network-pre.target apparmor.service systemd-sysctl.service
Before=network.target shutdown.target network-online.target
Conflicts=shutdown.target
BindsTo=sys-subsystem-net-devices-%i.device
After=sys-subsystem-net-devices-%i.device
DefaultDependencies=no
IgnoreOnIsolate=yes
[Service]
# avoid stopping on shutdown via stopping system-ifup.slice
Slice=system.slice
ExecStart=/bin/sh -ec 'ifup --allow=hotplug %I; ifquery --state %I'
ExecStop=/sbin/ifdown %I
RemainAfterExit=true
TimeoutStartSec=5min
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