Now the test actually has a recording and garbage with matching files.
This caught a few problems in the upgrade procedure:
* it didn't work with foreign keys enabled because the new recording
table was set up after the new camera table, and the old recording
table was destroyed after the old camera table. And now I enable
foreign keys all the time. Reorder the procedure to fix.
* the pathname manipulation in the v2 to v3 procedure was incorrect
since my introduction of nix because I gave it a &[u8] with the
trailing nul, where I should have used CStr::from_bytes_with_nul.
* it wasn't removing garbage files. It'd be most natural to do this
in the v2 to v3 upgrade (with the rename) but I historically removed
the table when upgrading to v2. I can't redefine the schema now, so
do it unnaturally.
I'm considering also renaming all uuid-like files on upgrade to v4/v5
to clean up this mess automatically for installations that have
already done this upgrade.
Add a new schema version 5; now 4 means the directory meta may or may
not be upgraded.
Fixes#65: now it's possible to open the directory even if it lies on a
completely full disk.
This is mostly untested and useless by itself, but it's a starting
point. In particular:
* there's no way to set up signals or add/remove/update events yet
except by manual changes to the database.
* if you associate a signal with a camera then remove the camera,
hitting /api/ will error out.
This is mostly just "cargo fix --edition" + Cargo.toml changes.
There's one fix for upgrading to NLL in db/writer.rs:
Writer::previously_opened wouldn't build with NLL because of a
double-borrow the previous borrow checker somehow didn't catch.
Restructure to avoid it.
I'll put elective NLL changes in a following commit.
--features=bundled enables -DSQLITE_DEFAULT_FOREIGN_KEYS=1, and so some
operations have to be done in the proper order.
* enable foreign key enforcement all the time, so I test this more reliably.
* reorder some parts of the v1->v3 order. foreign key enforcement is
immediate (rather than deferred) by default. and ensure
old_recording_playback isn't left with a dangling reference to old_recording
at the v2 stage. Instead, wait until v3 to delete tables it depends on.
In hindsight, the "post_tx" step in the upgrade process introduced in
e7f5733 doesn't make sense. If the procedure fails at this stage, nothing says
it still needs to be completed. If the sample file dirs have to be updated
after the database, then there should be another database version to mark that
it's fully completed, and indeed that's the purpose version 3 serves. So get
rid of the Upgrader trait and just go back to a simple run function per
version.
In the case of the sample file dir metadata, it actually can happen before the
database transaction; the stuff written to the database later just needs to be
consistent with what it finds if there's an existing metadata file from a
half-completed update.
For safety, ensure there are no unexpected directory contents before
upgrading 1->2, and ensure the metadata matches before upgrading 2->3.
Scott Lamb