NotFoundError with UID containing a slash

• vdirsyncer 0.19.3
• on Void-Linux but installed via Home-Manager (Nix)
• python 3.12 (via Nix)
• Config file:

[general]
status_path = "/home/me/.local/share/vdirsyncer/status"

### Pairs

[pair calendar]
a = "calendar_remote"
b = "calendar_local"
collections = ["from a", "from b"]
metadata = ["color", "displayname", "description", "order"]


### Local storages

[storage calendar_local]
fileext = ".ics"
path = "/home/me/calendar/calendar"
type = "filesystem"

### Remote storages

[storage calendar_remote]
password.fetch = ["command", "get", "pwd"]
type = "caldav"
url = "https://zimbra.tld/dav/user@zimbra.tld"
username = "user@zimbra.tld"

• vdirsyncer -vdebug sync output (last lines)

debug: Skipping '/dav/user@zimbra.tld/zimbra_name_for_distant_cal/distant_cal/87.ics', properties are missing.
error: Unknown error occurred for calendar/distant_cal: /dav/user@zimbra.tld/zimbra_name_for_distant_cal/distant_cal/130.ics
error: Use `-vdebug` to see the full traceback.
debug:   File "/nix/store/hv0b6ks5dgmq0g3iykw51jbaw0d7fp71-python3.12-vdirsyncer-0.19.3/lib/python3.12/site-packages/vdirsyncer/cli/tasks.py", line 74, in sync_collection
debug:     await sync.sync(
debug:   File "/nix/store/hv0b6ks5dgmq0g3iykw51jbaw0d7fp71-python3.12-vdirsyncer-0.19.3/lib/python3.12/site-packages/vdirsyncer/sync/__init__.py", line 149, in sync
debug:     a_nonempty = await a_info.prepare_new_status()
debug:                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
debug:   File "/nix/store/hv0b6ks5dgmq0g3iykw51jbaw0d7fp71-python3.12-vdirsyncer-0.19.3/lib/python3.12/site-packages/vdirsyncer/sync/__init__.py", line 69, in prepare_new_status
debug:     async for href, item, etag in self.storage.get_multi(prefetch):
debug:   File "/nix/store/hv0b6ks5dgmq0g3iykw51jbaw0d7fp71-python3.12-vdirsyncer-0.19.3/lib/python3.12/site-packages/vdirsyncer/storage/dav.py", line 553, in get_multi
debug:     raise exceptions.NotFoundError(href)

Hey, I'm having an issue trying to sync a calendar I'm subscribed to on a zimbra account. Here, zimbra_name_for_distant_cal refers to the calendar on the Zimbra server that is subscribed to distant_cal, however, it looks like there are no subfolder distant_cal, it's just that items have UID distant_cal/num, with the slash character included. I'm guessing this is the cause for the NotFoundError, as / here is not a path separator.

Start with the traceback locations in vdirsyncer/sync/init.py and vdirsyncer/storage/dav.py, especially get_multi() where NotFoundError is raised. Reproduce the Zimbra calendar case with an item whose UID contains a slash, then verify that such items are handled as UIDs rather than mistaken for path separators and can complete synchronization.