Vdirsyncer-2.0.0-alpha0 release notes

Author: WhyNotHugo

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content/blog/2024-05-22-vdirsyncer-2.0.0-alpha0.md

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+---
+layout: post
+title: Vdirsyncer 2.0.0-alpha0 release notes
+date: 2024-05-22
+categories: blog
+params:
+  author: WhyNotHugo
+---
+
+I've just tagged a first alpha version of the vdirsyncer rewrite. This is an
+EXPERIMENTAL VERSION, and has several missing features. It likely has bugs too,
+so I appreciate anyone willing to test this and report bugs.
+
+Keep in mind that as an early version, this MAY have bugs that result in data
+loss. Ensure that you keep frequent backups. If you are unwilling to help report
+bugs, please wait for a stable release.
+
+Compared to the previous series, there are a few exciting changes.
+
+## Continuing on errors
+
+When synchronising a collection, if a single items fails, synchronisation will
+continue and other items will be processed properly. This has an impact when a
+server rejects a single calendar event, but I want the other 500 events in my
+calendar to synchronise properly.
+
+## Daemon
+
+A new `daemon` command has been implemented. This keeps vdirsyncer running and
+performing new synchronisations every five minutes[^minutes]. In future
+releases, I intend to implement storage monitoring, so instead of having a fixed
+timeout, synchronisations will be triggered only when a storage reports that
+changes have occurred.
+
+[^minutes]: This period is actually configurable.
+
+I have been running `vdirsyncer daemon` in the background for the last few weeks
+and am quite happy with the results.
+
+## Collection creation and deletion
+
+When a collection is created or deleted on one side, this change will
+immediately replicate to the other side (assuming that the affected collections
+match the current configuration).
+
+This means that I can create a new calendar on one device, and it automatically
+shows up on another.
+
+If this behaviour is problematic for some use case, please do reach out so we
+can find a solution.
+
+## No more `discover`
+
+The `discover` command is gone and no longer necessary; discovery of collections
+is handled automatically.
+
+## Conflict resolution
+
+Conflict resolution is not executed during normal synchronisations. This is
+mostly because there commands are usually interactive and would interrupt the
+automated flow or regular synchronisations.
+
+Use `vdirsyncer resolve-conflicts` to manually resolve any conflicts.
+
+## Testing
+
+Testers are welcome. Using a custom CA certificate and specifying TLS
+certificate fingerprints has had minimal testing, so I would appreciate
+real-world testing of this.
+
+When migrating from the previous vdirsyncer implementation, ensure that your
+collections are already in sync. A new, separate status file is used, so any
+changes on either side will result in conflicts.
+
+It is not trivial to migrate back to the previous version either: you will have
+to ensure that both sides of your collection are in sync before doing so too.
+
+# Installation
+
+The current version needs to be built from source. The result is a single
+binary, that can be copied onto other hosts without any additional support files
+(note that binaries will only work across hosts of the same distribution and CPU
+architecture).
+
+```sh
+curl -LO https://git.sr.ht/~whynothugo/vdirsyncer-rs/archive/vdirsyncer/v2.0.0-alpha0.tar.gz
+tar xf v2.0.0-alpha0.tar.gz
+cd vdirsyncer-rs-vdirsyncer/v2.0.0-alpha0
+cargo build --release -p vdirsyncer
+cp target/release/vdirsyncer /usr/local/bin/
+```
+
+Replace `/usr/local/bin/` with any other directory in `$PATH`.
+
+Compilation will take a long time (several minutes, at least). I hope to improve
+this in future releases, although Rust doesn't make this easy. Fortunately, this
+cost pays off with vdirsyncer itself being quite lightweight at runtime.
+
+# Feedback
+
+See the [migration guide] for details on how to update a configuration file.
+There is currently no documentation on setting up a new configuration from
+scratch (this will be addressed at some point on a later release).
+
+Please [join us on IRC][contact] if you have feedback or questions.
+
+Issues are tracked in [a separate issue tracker][issues], to avoid any confusion
+with existing issues from the previous implementation.
+
+[contact]: /contact/
+[issues]: https://todo.sr.ht/~whynothugo/vdirsyncer-rs