report and trees open the database read-write and set journal_mode #8

New Issue

2026-08-09T03:44:07+02:00

clawbot commented

2026-08-09 03:44:07 +02:00

db.go:78-95 builds one DSN shared by openScanDatabase (db.go:99) and openReportDatabase (db.go:133), and that DSN includes _pragma=journal_mode(WAL). Setting journal_mode is a write.

README §Database describes the intended deployment as a daily scan cron job maintaining /var/lib/sfdupes/db.sqlite, with report and trees "run interactively whenever needed". In that deployment the database is owned by the cron user (typically root) and the interactive report is not. An unprivileged report therefore fails to open a database it only needs to read. The same failure hits a read-only mount, a ZFS snapshot copy, or a database on read-only media — all natural things to want to run a report against, given the whole design promises analysis never touches the scanned filesystem.

Definition of done

openReportDatabase uses a read-intent DSN: mode=ro plus _pragma=query_only(1), retaining the busy timeout so a report during a concurrent scan still behaves. It must not set journal_mode.
openScanDatabase keeps the read-write DSN unchanged, including WAL.
A test chmods a populated database to 0444 and asserts both report and trees succeed and produce correct output.
README §Database states that report and trees require only read access to the database file.
make check green.

`db.go:78-95` builds one DSN shared by `openScanDatabase` (`db.go:99`) and `openReportDatabase` (`db.go:133`), and that DSN includes `_pragma=journal_mode(WAL)`. Setting `journal_mode` is a write. README §Database describes the intended deployment as a daily `scan` cron job maintaining `/var/lib/sfdupes/db.sqlite`, with `report` and `trees` "run interactively whenever needed". In that deployment the database is owned by the cron user (typically root) and the interactive report is not. An unprivileged `report` therefore fails to open a database it only needs to read. The same failure hits a read-only mount, a ZFS snapshot copy, or a database on read-only media — all natural things to want to run a report against, given the whole design promises analysis never touches the scanned filesystem. ## Definition of done 1. `openReportDatabase` uses a read-intent DSN: `mode=ro` plus `_pragma=query_only(1)`, retaining the busy timeout so a report during a concurrent scan still behaves. It must not set `journal_mode`. 2. `openScanDatabase` keeps the read-write DSN unchanged, including WAL. 3. A test chmods a populated database to `0444` and asserts both `report` and `trees` succeed and produce correct output. 4. README §Database states that `report` and `trees` require only read access to the database file. 5. `make check` green.

clawbot added this to the 1.0.0 milestone 2026-08-09 03:44:07 +02:00

clawbot referenced this issue

2026-08-09 03:47:54 +02:00

Land golangci-lint v2.12.2 and the canonical .golangci.yml on main #3

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2026-08-09 04:11:01 +02:00

Guarantee the database is closed on every fatal exit path #4

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2026-08-09 04:27:39 +02:00

Guarantee the database is closed on every fatal exit path (closes #4) #29

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2026-08-09 04:38:42 +02:00