Facter spamming "dhcpcd is not running" on ubuntu 24.04

[archaron]

Describe the Bug

Same as #2773. When running facter on Ubuntu 24.04 with no dhcp-enabled interfaces, facter tries to run dhcpcd -U <interface> that produces an error over every detected interface.

Previous issue was closed by its author as 'resolved', but error is still there. Fixing by purging dhcpcd-base is not an option, because many system packets depends on it.

As mentioned in this comment , I think, facter needs an additional check if dhcdpcd is running.

# apt-cache rdepends dhcpcd-base
dhcpcd-base
Reverse Depends:
  cloud-init
  dhcpcd
  ubuntu-minimal
  initramfs-tools-core
  cloud-init
 |madwimax
 |libguestfs0t64
  mini-iso-tools

syslog:

.....
server dhcpcd[34667]: dhcpcd is not running
server dhcpcd[34668]: dhcpcd is not running
server dhcpcd[34672]: dhcpcd is not running
server dhcpcd[34673]: dhcpcd is not running
.....

facter debug log:

DEBUG Facter::Resolvers::Linux::Networking - Get DHCP for interface lo 
DEBUG Facter::Resolvers::Linux::Networking - Attempt to get DHCP for interface lo, from systemd/netif/leases 
DEBUG Facter::Util::FileHelper - File at: /run/systemd/netif/leases/1 is not accessible. 
DEBUG Facter::Resolvers::Linux::Networking - Attempt to get DHCP for interface lo, from dhclient leases 
DEBUG Facter::Resolvers::Linux::Networking - Attempt to get DHCP for interface lo, from dhcpcd command 
DEBUG Facter::Core::Execution::Posix - Executing command: /usr/sbin/dhcpcd -U lo 
DEBUG Facter::Resolvers::Linux::Networking - Command /usr/sbin/dhcpcd -U lo completed with the following stderr message: dhcpcd is not running 

Expected Behavior

No errors.

Steps to Reproduce

Steps to reproduce the behavior:
apt-get purge dhcpcd
Run facter
Check log: tail -f /var/log/syslog -n 200

Environment

Distributor ID: Ubuntu
Description: Ubuntu 24.04.1 LTS
Facter version: 4.10.0

[mhashizume]

Thank you for reporting this @archaron , our team has added this issue to our backlog.

[github-actions]

Migrated issue to FACT-3489

[joshcooper]

@archaron what's the best way to detect if the dhcpcd service is running? Would it be sufficient to check for the existence of /var/run/dhcpcd.pid?

[archaron]

As I can see, there are two ways pid filename can be generated:

       # man 5 dhcpcd

       /run/dhcpcd/pid
       Stores the PID of dhcpcd running on all interfaces.

       /run/dhcpcd/interface.pid
       Stores the PID of dhcpcd running on the interface.

But my system doesn't have dhcpcd running and this directory doesn't exist at all:

# ls /run/dhcpcd
ls: cannot access '/run/dhcpcd': No such file or directory

# dhcpcd --version
dhcpcd 10.0.6
Copyright (c) 2006-2023 Roy Marples
Compiled in features: INET ARP ARPing IPv4LL INET6 DHCPv6 AUTH PRIVSEP