More robust filewriting

[MathieuBordere]

There are some mentions of corrupted / empty cluster.yaml files. This PR should help prevent these cases.

• Atomically replace files when writing by using the renameio package.
• Protect against empty server list (if an empty list is ever even possible).

Fixes #145

[freeekanayaka]

Looks good to me. Beware that adding a new dependency means having to update the Launchpad Debian package recipe (and import that new dependency in the repository).

[MathieuBordere]

Looks good to me. Beware that adding a new dependency means having to update the Launchpad Debian package recipe (and import that new dependency in the repository).

Thanks for the heads up, I'll have a look.

[MathieuBordere]

@freeekanayaka So I think I have to update the recipe here https://code.launchpad.net/~dqlite/+recipe/dqlite, but I don't really find where I can add the repository to the list of other repositories here https://code.launchpad.net/dqlite.

Thanks a lot if you could give me a pointer in the right direction.

[freeekanayaka]

@freeekanayaka So I think I have to update the recipe here https://code.launchpad.net/~dqlite/+recipe/dqlite, but I don't really find where I can add the repository to the list of other repositories here https://code.launchpad.net/dqlite.

Thanks a lot if you could give me a pointer in the right direction.

You should be able to create a new import from GitHub using this link https://code.launchpad.net/+code-imports/+new