Check if keyring is unlocked before setting password

[samuel-w]

I need someone to test the macOS keyring. Should display Please unlock your password manager. if locked, nothing if unlocked when adding a repository. I have no idea whether it will work or not since I don't have a mac to test it on.

Could still break since lock check happens a few seconds before adding a repository, but I think this covers most cases. The only way to fix it would be to set the password and then delete it if the action failed which is a bit clunky and could result in data loss. Just don't lock the keyring in the 10 seconds it takes to add a repo.

Fixes #606

[m3nu]

Volunteer here. 👋

[m3nu]

macOS already shows a prompt to unlock the keychain. So I only got the new message when adding a new repo, not an existing one. Still OK to add this check, as it's common with keychains.

[samuel-w]

It's only should pop up if you dismiss the keyring unlock prompt.

The goal is to prevent set password from running with a locked keyring as in that case it would not write the password and could crash things.

[codecov-io]

Codecov Report

Merging #607 (6c2c070) into master (19b4946) will decrease coverage by 0.45%.
The diff coverage is 42.30%.

@@            Coverage Diff             @@
##           master     #607      +/-   ##
==========================================
- Coverage   74.48%   74.03%   -0.46%     
==========================================
  Files          53       53              
  Lines        3422     3428       +6     
==========================================
- Hits         2549     2538      -11     
- Misses        873      890      +17     

Impacted Files	Coverage Δ
src/vorta/borg/init.py	75.00% <ø> (-0.87%)	⬇️
src/vorta/keyring/secretstorage.py	37.14% <12.50%> (-6.86%)	⬇️
src/vorta/borg/borg_thread.py	78.91% <33.33%> (-1.21%)	⬇️
src/vorta/borg/info.py	25.58% <40.00%> (-1.92%)	⬇️
src/vorta/keyring/abc.py	87.50% <71.42%> (-5.10%)	⬇️
src/vorta/keyring/darwin.py	94.59% <81.81%> (-5.41%)	⬇️
src/vorta/keyring/db.py	100.00% <100.00%> (ø)
src/vorta/borg/version.py	33.33% <0.00%> (-3.51%)	⬇️
src/vorta/borg/extract.py	25.00% <0.00%> (-3.00%)	⬇️
... and 18 more

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[samuel-w]

Is this good to go?

[m3nu]

This overlaps with #550. So let's merge that first and then rebase to avoid any conflicts.

[m3nu]

After that I'll test on macOS. Though most changes are for Linux. Locked keychains are possible, but very unusual for the main login keychain in macOS.