Cryptic error message if accounts.lock is locked

[Hocuri]

How this happened to me:

Due to some bug deltachat/deltachat-desktop#4748, DC Desktop crashed but the accounts.lock stayed locked.

How DC Desktop crashed

I don't remember exactly what I did, but it was something along these lines:

• Click "+" for new account
• Press ESC
• Try to select another account
• -> DC Desktop is completely frozen
• I closed DC

But when I try to reproduce this, everything works fine.

Steps to reproduce:

• Lock the accounts.lock file using flock /home/.../DeltaChat/accounts/accounts.lock --command "sleep 1000"
• Try to open Delta Chat

Actual behavior:

Expected behavior:

A nice error message should be shown.

Possible solutions:

• Make the error message nicer
• Remove the locking of accounts.lock (this would also get us rid of one dependency, fd-lock) (see create_lock_task() in accounts.rs)

[Simon-Laux]

issue on desktop repo for reference: deltachat/deltachat-desktop#4748