# Issue #78: session loss on Fedora 45

Investigation on 2026-11-14 of [issue #78](https://github.com/narrrl/proton-drive-linux/issues/78),
using its report and comments through `gh`, pdfs 3.7.0/current source, and the oo7 0.7.0 tag.

## What is established

The reporter still saw the problem with oo7 0.7.0 on November 7. The original
[SetSecret persistence fix](https://github.com/linux-credentials/oo7/commit/7fb11dd111c4be8fec01996e3caa31c44fa962b3)
is present in that release. In an isolated test, three successive binary `SetSecret` updates
survived reopening the keyring file. Repeating the original persistence explanation is therefore
insufficient.

A different, reproducible failure exists at the boundary between oo7 and pdfs:

1. oo7 0.7.0's `Collection::search_inner_items` returns an empty list for a locked collection.
   `SearchItems` consequently returns **both** the unlocked and locked lists empty even when the
   matching item is on disk. The isolated test reproduces this with pdfs's exact lookup attributes.
   This is upstream [oo7 #614](https://github.com/linux-credentials/oo7/issues/614).
2. `dbus-secret-service-keyring-store` 1.0.1 maps an empty search to `keyring_core::Error::NoEntry`;
   pdfs maps that to `Error::NotLoggedIn`. The client cannot offer an unlock when no locked item
   is reported.
3. In pdfs 3.7.0 and the code before this change, `TokenSink::flush` treated `NotLoggedIn` as a
   logout, cleared the pending rotation and returned success. It skipped the error path that
   retains the new tokens in the kernel keyring and retries their persistence. The code was
   unchanged between v3.7.0 and this investigation.
4. If a token refresh encounters that reply, the saved blob retains a spent refresh token. The
   running process can keep working with the new tokens in memory; a restart then exposes the
   stale saved credentials. A regression test failed before the fix and passes afterward.

The same unsafe assumption also applies to transient empty lookups such as the race reported in
[oo7 #652](https://github.com/linux-credentials/oo7/issues/652), fixed in 0.7.1. That issue's
replacement race was not independently reproduced here; pdfs normally updates existing items
with `SetSecret`, so it must not be assumed to encounter the same-item `CreateItem` race.

## Change and limits

`TokenSink::flush` now propagates a missing-session error instead of discarding the rotation.
The existing retry, kernel-keyring recovery and unsaved-token status paths can then run. Once
the collection is unlocked and readable, the pending rotation is saved. A genuinely deleted
session is never recreated: flushing still requires a readable blob with the matching session
ID and expected refresh token. A new login causes the old rotation to be discarded as before.

This is a confirmed pdfs defect (B284), **not a confirmed complete explanation of the reporter's
cold-boot failure**. The issue has no oo7 logs or record showing that its collection was locked
when a token rotated. A locked keyring only at startup can hide a login, but does not by itself
explain `InvalidRefreshToken`. The token-loss path requires a successful refresh while the saved
entry is unreadable.

The fix does not make a locked keyring writable. If it stays unreadable until power-off, tokens
retained in process/kernel memory still cannot survive a cold boot. No new disk credential store
or credential format is introduced.

Other upstream Fedora-upgrade issues were checked: [oo7 #651](https://github.com/linux-credentials/oo7/issues/651)
creates duplicate placeholder/migrated collections and refuses writes; [oo7 #662](https://github.com/linux-credentials/oo7/issues/662)
can resolve the default alias to a locked collection. Both have fixes in
[0.7.1](https://github.com/linux-credentials/oo7/releases/tag/0.7.1), released November 10,
after the reporter's November 7 retest. Neither can be assigned as this report's cause without
matching runtime evidence.

## Reproduce without a Proton account or desktop keyring

The oo7 fixture uses fake tokens, a temporary disk keyring and a private peer-to-peer D-Bus
connection. It asserts the observed 0.7.0 behavior, including the incorrect empty locked lookup;
passing means that behavior was reproduced. It does not simulate Proton refresh or a full boot.

From the pdfs repository, choose an unused temporary checkout path:

```sh
git clone --depth 1 --branch 0.7.0 https://github.com/linux-credentials/oo7.git /tmp/pdfs-oo7-repro
git -C /tmp/pdfs-oo7-repro apply "$PWD/docs/repro/oo7-0.7.0-issue78.patch"
cargo test --manifest-path /tmp/pdfs-oo7-repro/Cargo.toml \
  -p oo7-daemon --lib --features test-util issue78 -- --nocapture
```

Observed output:

```text
oo7 0.7.0: locked session is on disk but SearchItems returns (0, 0)
oo7 0.7.0: all three binary SetSecret updates survived reopening the disk keyring
test item::tests::issue78_locked_lookup_hides_saved_tokens ... ok
```

The pdfs side is covered by `cargo test -p pdfs-core auth::tests`, specifically
`a_temporarily_missing_session_does_not_discard_a_rotation` and
`retrying_a_missing_session_never_recreates_it_or_overwrites_a_new_login`.

Remaining live validation: reproduce on a Fedora 45 GNOME session across logout/shutdown,
correlating oo7 lock/write errors with pdfs refresh and retry logs, and checking the running
daemon's package version rather than just the CLI version. The investigation did not use a real
Proton account, alter a desktop keyring, or post to either GitHub issue.