Tim (Discord): cover-art automation fails with '[Errno 30] Read-only file
system' on every file; he chmod 777'd and nothing changed — because EROFS is
the KERNEL refusing writes to a docker ':ro' volume mount, which no chmod
can fix. SoulSync's response was a wall of per-file warnings and a fix
result that still said success with a soft "(read-only?)" hint.
- apply_art_to_album_files now pre-flights the album folder with statvfs
(asks the kernel, writes nothing): a read-only mount short-circuits the
whole album instead of failing file by file. Belt: a per-file/cover EROFS
(overlay quirks where statvfs lies) still sets the flag.
- the repair worker's apply now FAILS the finding with the actual cure:
"remove ':ro' from the volume mapping and recreate the container — chmod
cannot change this". EACCES (a real permissions problem chmod CAN fix)
deliberately keeps the old soft path.
Tests: RO mount short-circuits before any file/cover write, save-time EROFS
still flagged, EACCES not conflated with EROFS. 29 art/repair tests pass.
Verification found a non-additive edge: embed_album_art_metadata uses FLAC
add_picture(), which APPENDS — so applying to an album where some tracks already
had art would have added a duplicate embedded picture. The apply now checks each
file and skips any that already carry art (shared _audio_has_art helper), so it
only ever ADDS art to files missing it. Test covers the skip (no re-embed).
Previously the filler only flagged albums whose DB thumb_url was empty and, on
apply, only updated that DB thumb_url — so albums whose files had no embedded
art and no cover.jpg (but whose DB row had a URL) were never found, and even
'applying' art never touched the files. That's the reported 'doesn't scan all
albums' gap.
New core.metadata.art_apply (reuses the post-processing standard so the user's
album_art_order is honored):
- album_has_art_on_disk(): cheap-first check — folder cover.jpg/folder.jpg
sidecar, then embedded art in a representative track (FLAC/ID3/MP4/Vorbis).
- apply_art_to_album_files(): embeds via embed_album_art_metadata + writes
cover.jpg via download_cover_art; only ADDS art (never rewrites the user's
tags); read-only/unwritable files are skipped + counted, never crash.
Scan now examines every titled album and flags it when art is missing in the DB
OR on disk. Apply embeds into the album's audio files + writes cover.jpg in
addition to the DB thumbnail (media-server-only albums fall back to DB-only).
Tests cover sidecar/embedded detection, the cheap-first short-circuit, and the
apply orchestration (embeds each file + cover.jpg; read-only failures counted).
