config init: unlink files before copying over

[bendlas]

What is the purpose of this pull request? (put an "X" next to item)

[ ] Documentation update
[x] Bug fix
[ ] New feature
[ ] Other, please explain:

What changes did you make? (Give an overview)

When:

• running a webtorrent instance in an electron instance with broken mesa libs
• (does not load) closing blank window
• run in electron with correct gfx, startup crashes:

Error:

Missing config file: Creating new one
(node:679284) UnhandledPromiseRejectionWarning: Error: EACCES: permission denied, copyfile '/home/user/code/webtorrent-desktop/static/bigBuckBunny.jpg' -> '/home/user/.config/WebTorrent/Posters/88594aaacbde40ef3e2510c47374ec0aa396c08e.jpg'
    at copyFileSync (node:fs:2894:3)
    at func (node:electron/js2c/asar_bundle:2:2131)
    at overwriteSync (/home/user/code/webtorrent-desktop/src/renderer/lib/state.js:125:3)
    at /home/user/code/webtorrent-desktop/src/renderer/lib/state.js:158:5
    at Array.forEach (<anonymous>)
    at setupStateSaved (/home/user/code/webtorrent-desktop/src/renderer/lib/state.js:155:27)
    at EventEmitter.load (/home/user/code/webtorrent-desktop/src/renderer/lib/state.js:230:15)

I wish I could explain why this happens, but neither ls nor lsattr shows anything:

% ls -alh ~/.config/WebTorrent/Posters
Missing config file: Creating new one
(node:679284) UnhandledPromiseRejectionWarning: Error: EACCES: permission denied, copyfile '/home/user/code/webtorrent-desktop/static/bigBuckBunny.jpg' -> '/home/user/.config/WebTorrent/Posters/88594aaacbde40ef3e2510c47374ec0aa396c08e.jpg'
    at copyFileSync (node:fs:2894:3)
    at func (node:electron/js2c/asar_bundle:2:2131)
    at overwriteSync (/home/user/code/webtorrent-desktop/src/renderer/lib/state.js:125:3)
    at /home/user/code/webtorrent-desktop/src/renderer/lib/state.js:158:5
    at Array.forEach (<anonymous>)
    at setupStateSaved (/home/user/code/webtorrent-desktop/src/renderer/lib/state.js:155:27)
    at EventEmitter.load (/home/user/code/webtorrent-desktop/src/renderer/lib/state.js:230:15)
% lsattr -a ~/.config/WebTorrent/Posters
---------------------- /home/user/.config/WebTorrent/Posters/.
---------------------- /home/user/.config/WebTorrent/Posters/..
---------------------- /home/user/.config/WebTorrent/Posters/02767050e0be2fd4db9a2ad6c12416ac806ed6ed.jpg
---------------------- /home/user/.config/WebTorrent/Posters/6a02592d2bbc069628cd5ed8a54f88ee06ac0ba5.jpg
---------------------- /home/user/.config/WebTorrent/Posters/a88fda5954e89178c372716a6a78b8180ed4dad3.jpg
---------------------- /home/user/.config/WebTorrent/Posters/88594aaacbde40ef3e2510c47374ec0aa396c08e.jpg
---------------------- /home/user/.config/WebTorrent/Posters/6a9759bffd5c0af65319979fb7832189f4f3c35d.jpg

The workaround fixes it though.

Which issue (if any) does this pull request address?

Is there anything you'd like reviewers to focus on?

[github-actions]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

[bendlas]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

Still relevant. Only thing blocking this is lack of reviews.

[github-actions]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

[bendlas]

@gillesdemey @rom1504 I think we should also have this in. It has finally fixed the nagging heisenbug, where webtorrent-desktop randomly stops starting up. As with #2388, we've been shipping this in NixOS for some time now.

If you think it would be worth, please re-open. I'll be happy to rebase.