Add support for zipped KO-files

[philmmanjaro]

On some Distributions like Manjaro KO-files might be zipped to save space. Currenlty LDM doesn't support this:

mkmodaliases linux415-nvidia /usr/lib/modules/extramodules-4.15-MANJARO/nvidia.ko.gz
File does not appear to be a kernel module: /usr/lib/modules/extramodules-4.15-MANJARO/nvidia.ko.gz

On our end we use cmds like gzip "${pkgdir}/usr/lib/modules/${_extramodules}/"*.ko

[ikeydoherty]

Ah thats interesting - is this currently the only format you're using? Or other compression formats?

Basically I'm wondering whether a cheap suffix check is enough or I should explicitly check the mimetype and attempt to use zlib or whether libarchive is needed

[ikeydoherty]

BTW I should point out that the one problematic package for mkmodaliases at this point is the NVIDIA set, per the README. We might need to teach it how to deal with those nuances so that we can drop the custom scripts we all use derived from Jockey modaliases world

[philmmanjaro]

Well, after looking into your scripts I found out that you created those modealiases during package creation. We can use the same, even the Jockey modaliases format. So this is totally optional. On installed systems most of the KO-files are zipped.