t3c support non-yum/rpm systems

[ocket8888]

This Improvement request (usability, performance, tech debt, etc.) affects these Traffic Control components:

• Traffic Control Cache Config (T3C, formerly ORT)

Current behavior:

Currently, t3c uses rpm on all apply runs (even in report mode or with -a/--service-action set to none and -k/--install-packages not given) to check if ATS is installed. If /bin/rpm does not exist, this will cause the run to fail. Likewise -k/--install-packages will fail if /usr/bin/yum does not exist.

New behavior:

Ideally, t3c would support the most popular package managers (and look in PATH instead of a hard-coded file path):

• apt
• yum
• dnf
• apk
• pacman

That would allow it to more easily support more platforms. The system to use could be determined at runtime, or it could be configured on the cache server's Profile, since the format of version strings vary between these systems, and the Parameters are where those version strings are specified. It could also try to convert from a standard format to whatever the system's package management system uses, but that sounds much harder.

[mikeV02]

Hi,

I have made some efforts to make it work with "dpkg" for Debian based Linux. They are not very elegant, but with this I have made it to work to sync my ATS servers installed on Debian with TrafficOps.

I modified cache-config/t3c-apply/util/util.go on line 302, and added the following:

Then, I modified cache-config/t3c-apply/torequest/torequest.go on line 34 to make use of the module "bufio", and bellow on line 583 I modified to add a check for the os-release file in /etc (not elegant) to check if it was running CentOS or Debian/Ubuntu.

[mikeV02]

Hello,

I forgot to mention that on line 575 for the file cache-config/t3c-apply/config/config.go, I commented out the check for "chkconfig" command.