t3c: Can't detect SystemD in Rocky Linux 9

[smalenfant]

This Bug Report affects these Traffic Control components:

• Traffic Control Cache Config (t3c, formerly ORT)

What did you do?

Installed Cache Config on Rocky LInux 9 and it won't detect systemd as the service management.

What did you expect to happen?

Cache config to enable traffic server service

What actually happened?

After rebooting the server after the initial install, cache config did not enable Traffic Server.

I could see the following in the log: OS checks are enabled and unable to find any know service management tools.

Notes

The command used by t3c is the following and it works just fine when used manually.

# /bin/sh -c "/bin/systemctl --version"
systemd 252 (252-14.el9_2.3.0.1)
+PAM +AUDIT +SELINUX -APPARMOR +IMA +SMACK +SECCOMP +GCRYPT +GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS -FIDO2 +IDN2 -IDN -IPTC +KMOD +LIBCRYPTSETUP +LIBFDISK +PCRE2 -PWQUALITY +P11KIT -QRENCODE +TPM2 +BZIP2 +LZ4 +XZ +ZLIB +ZSTD -BPF_FRAMEWORK +XKBCOMMON +UTMP +SYSVINIT default-hierarchy=unified

[smalenfant]

I believe I found the problem.

RHEL9 doesn't come with /sbin/chkconfig. But the code is not handling this right. Will always be Unknown.

trafficcontrol/cache-config/t3c-apply/config/config.go

Lines 677 to 691 in 2eb00e0

	func getOSSvcManagement() SvcManagement {
	var _svcManager SvcManagement
	if isCommandAvailable(SystemCtl) {
	_svcManager = SystemD
	} else if isCommandAvailable(Service) {
	_svcManager = SystemV
	}
	if !isCommandAvailable(Chkconfig) {
	return Unknown
	}
	// we have what we need
	return _svcManager
	}

I'm not sure why this is not a different conditional.