Base native plugins for Alpine linux

[pombredanne]

This is to support #1262
For now these contain placeholder empty .so/.exe

Signed-off-by: Philippe Ombredanne pombredanne@nexb.com

[sschuberth]

Hmm. Creating an alpine sub-directory below plugins does not seem to match the current conventions. I would have expected this to create directories like

extractcode-7z-alpinelinux1_x86_64
extractcode-libarchive-alpinelinux1_x86_64
typecode-libmagic-alpinelinux1_x86_64

[pombredanne]

@sschuberth since there is no support for now for linux distros in Wheels tags, this is a workaround: we will still be able to get pre-built for Alpine but they must use a name such as the one I use (note that this directory name does not matter much... what matter is the name inside setup.py AND the platform plat-name arg inside here https://github.com/nexB/scancode-toolkit/blob/88127230c2d12d8ede3f8e391e4b1157cf43ffb2/plugins/alpine/extractcode-7z-linux_x86_64/setup.cfg#L5 (which is wrong btw and should be instead linux_x86_64 since this is the tag for Alpine based on your comments)

In anycase, if and when distro will be supported in pip the tag will most likely be in the style of: linux_x86_64_alpine ... and not alpinelinux1_x86_64 as the distro would likely come last.

[codecov]

Codecov Report

Merging #1284 into develop will increase coverage by 0.14%.
The diff coverage is 60%.

@@             Coverage Diff             @@
##           develop    #1284      +/-   ##
===========================================
+ Coverage    84.11%   84.25%   +0.14%     
===========================================
  Files          118      118              
  Lines        13037    13041       +4     
===========================================
+ Hits         10966    10988      +22     
+ Misses        2071     2053      -18

Impacted Files	Coverage Δ
src/commoncode/command.py	85.59% <100%> (ø)	⬆️
src/scancode/extract_cli.py	87.25% <50%> (+2.25%)	⬆️
src/scancode/cli.py	77.09% <50%> (+1.18%)	⬆️
src/scancode/api.py	96.29% <0%> (+1.48%)	⬆️
src/formattedcode/output_spdx.py	90.05% <0%> (+1.65%)	⬆️
src/packagedcode/plugin_package.py	92.3% <0%> (+1.92%)	⬆️
src/formattedcode/output_csv.py	86.8% <0%> (+2.08%)	⬆️

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[sschuberth]

Ok.

So by now it seems we have a bunch of not-strictly-Alpine-Linux-related cleanup commits in here. I don't have the background to judge all changes in-depth, but they look reasonable to me.

[steven-esser]

@pombredanne Ping. Not sure if this is ready or not.

[pombredanne]

Closing this for now.

1. this is stale
2. the whole set of native plugins would nee to be built from sources to tun on Alpine as there are dependencies on libc in these. https://github.com/nexB/scancode-plugins should help though