Lidarr renames an artist or album folder, music-mirror prunes the old path and
encodes the new one, and every entry in Apple Music pointing at the old path
dies. Music offers no view of those, and the exclamation mark only appears once
a track is touched.
Reads the XML from Music's own Export Library rather than asking Music itself.
A broken track makes AppleScript's `location` raise instead of returning a
value, so a bulk query dies on the first one with error -1728 and a per-track
loop costs an Apple event apiece.
Checked against a single directory walk rather than a test per file. On a
fifty-thousand-track library that is around seven thousand directory reads
instead of fifty thousand stat calls, and over SMB each of those stats is a
network round trip -- which is the difference between seconds and minutes.
Two comparisons have to be loosened or most of the library reads as missing.
macOS stores filenames decomposed while the share composes them, so the umlauts
in Motley Crue are two different byte strings depending on which side wrote the
name; both are normalised to NFC. And the share is very likely
case-insensitive, so a file is not missing because someone capitalised it
differently.
The test stage now copies tools/ as well, since the suite covers this and the
runtime image deliberately does not carry it.
First stage of a curation tool for the music library that music-mirror
mirrors. Before anything can build playlists or decide what has gone cold,
there has to be a local, queryable record of what is actually played; an API
call per question does not scale to a library-sized analysis.
Ingest is in two halves. A catch-up fetches everything scrobbled since the
newest scrobble held, and a backfill walks the history backwards until it runs
out. Both take their bounds from the database rather than from a saved cursor,
so an interrupted run resumes from what it actually has, and both windows are
bounded at each end so paging cannot shift under the fetch while new scrobbles
arrive mid-run.
Scrobbles carry no identifier, so the primary key is timestamp, artist and
track. Two plays of one track in the same second collapse into a single row:
they are indistinguishable in the data, and a surrogate key would make
re-ingest non-idempotent, which is the worse trade.
Three API behaviours are handled explicitly because each fails silently:
the currently-playing track arrives with no timestamp and would be re-ingested
on every pass; a lone result is returned as a bare object rather than a
one-item list; and MBIDs are empty strings rather than absent when unknown,
which would later look like a usable join key.
Retries cover the rate limit and the transient backend errors with an
exponential backoff. An invalid or suspended key fails immediately.
The report exists to surface one number before the next stage is built: the
share of scrobbles carrying a MusicBrainz recording id. Lidarr exposes the same
identifier per track, so those can be joined exactly and the rest must go
through name matching. That percentage bounds how far the matcher can be
trusted.
No runtime dependencies, and the tests run against a fake transport that
reproduces the service's paging and response shapes, so they need neither
network nor credentials.
Emma Thorpe