Switch distro-specific module streams

[mark-au]

Some dnf modules are named after a distribution('rhel' or 'rhel8'). Switch them to to the 'ol' or 'ol8' equivalents. Resolves #8

An example of CentOS8:

$ dnf module list | grep rhel
container-tools      rhel8 [d]   common [d]                               Common tools and dependencies for container runtimes                        
go-toolset           rhel8 [d]   common [d]                               Go                                                                          
jmc                  rhel8 [d]   common [d], core                         Java Mission Control is a profiling and diagnostics tool for the Hotspot JVM
llvm-toolset         rhel8 [d]   common [d]                               LLVM                                                                        
rust-toolset         rhel8 [d]   common [d]                               Rust                                                                        
virt                 rhel [d][e] common [d]                               Virtualization module

Signed-off-by: Mark Cram [email protected]

[mark-au]

In draft state while I do a final test

[Djelibeybi]

We should either break here or get user confirmation to continue, instead of just logging the exception.

I would then rewrite this as "Cannot switch enabled module \"${module}\" to Oracle Linux. Continue switching (y/N): with "no" as the default option.

[mark-au]

At this point in the code the core OS has been switched and we're tidying up the edge cases. We can't easily revert the changes already made so I don't think halting would help. I appreciate it's something that should be strongly highlighted to the user to replace a line that may scroll by.

What do you think of a summary at the end indicating that a module $x couldn't be automatically switched and requires manual intervention?

[Djelibeybi]

I think we should move this test to before we do anything that changes the system so that users have the option to abort the switch before any damage is done.

[mark-au]

OK, I'll leave this modify code at the end but I'll add a check at the start to see if there are rhel* streams enabled that we aren't familiar with.

[Djelibeybi]

Thant seems like a perfectly cromulent solution.

[mark-au]

Implemented change. I temporarily disabled knowledge of the virt:rhel stream and this is the output:

$ sudo bash up.sh 
Checking for required packages...
Checking your distribution...
Checking for yum lock...
Checking for required python packages...
Identifying dnf modules that are enabled
This tool is unable to automatically switch module 'virt' from a CentOS 'rhel' stream to
an Oracle Linux equivalent. Do you want to continue and resolve it manually?
You may want select No to stop and raise an issue on https://github.com/oracle/centos2ol/ or contact <[email protected]> for advice.
1) Yes
2) No
#? 2
Unsure how to switch module 'virt'. Exiting as requested
For assistance, please email <[email protected]>.

[Djelibeybi]

What if there are multiple unknown modules? This format seems very single-module specific.

Also, only provide the GitHub URL, not the email address.