fix(android): reopen the startup project after the app process restarts (#1948) - #1949
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…ts (#1948) On Android, both startup modes fell back to the default workspace on every cold start and showed "The startup project is unavailable." Two things were in the way. `openRecentProjectFile` sends the stored path to the `read_project_file` Tauri command, whose guard requires a filesystem path, so a `content://` URI was refused before anything was read. Routing content URIs through `tauri-plugin-fs` instead (it resolves them via Android's ContentResolver) gets past that, but only until the process ends: `tauri-plugin-dialog`'s `open()` launches `ACTION_GET_CONTENT`, whose read grant is tied to the activity that received it and cannot be renewed from inside the app - a persistable grant needs `ACTION_OPEN_DOCUMENT` plus `takePersistableUriPermission`, neither of which the plugin issues. The startup restore runs exactly once per cold start, which is exactly when that grant is gone, so the feature could never work there. This is the read-side half of the problem #1833 fixed for saving. So GeoLibre keeps its own copy. `lib/startup-project-snapshot.ts` writes the project text into the app's private data directory whenever the startup preference points at the project being opened or saved, and `openRecentProjectFile` falls back to that copy when the original URI can no longer be read. Two fixed slots ("specific" and "last") rather than one file per project: the preference can only ever restore two projects, and a fixed pair needs no pruning - which would need an `fs:allow-remove` scope the app deliberately does not grant outside its own temp files. Committing the preference in Settings also copies the project right then, via `ensureStartupProjectSnapshot`. That is the path the report describes - open a project, then ask for it back on the next launch - and nothing else re-reads the project in between, so without it the preference would be saved with no copy behind it. Everything is gated on the path being a content URI, so desktop keeps re-reading the real file and never doubles a project on disk. A copy over 25 MB is skipped (the ceiling already applied to a project fetched by URL) rather than duplicating hundreds of megabytes of embedded vector data on a phone. The source path must match exactly, so a copy can never stand in for a different project, and a `RecentProjectGoneError` still means gone - a deleted file is not resurrected from a stale copy. Every failure is logged and swallowed: the copy is a fallback for a later launch and must never fail the open or save that triggered it. The `fs:scope` entry in the capability is required, not incidental. An fs permission's scope applies only to the commands that permission grants, so `fs:default`'s app-directory scope reaches `read_text_file` but not `mkdir` or `write_text_file`; without the entry every copy fails with "forbidden path" (caught on the emulator, not by inspection). Verified on an Android 16 emulator with the reporter's own steps and a project at the path from the report, /sdcard/Documents/json/General_Project.geolibre.json: open it through the document picker, set the startup preference, force-stop, cold start. Before the change the log shows "Could not restore the startup project ... requires that you obtain access using ACTION_OPEN_DOCUMENT"; after it, both "Reopen the last project" and "Open a specific project" come back with the project, its layer, and its camera, no banner, and the log shows the fallback taking over from the dead URI. Fixes #1948
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Included review availability: Your plan includes up to 8 reviews per rolling hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe PR adds Android startup-project snapshots for ChangesAndroid startup project snapshots
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The change preserves Android startup projects across process restarts by storing private snapshots, but a missing newest snapshot can prevent reopening an older valid snapshot for the same project path. The PR is mergeable with explicit owner awareness or follow-up for this bounded restoration risk. Sequence Diagram(s)sequenceDiagram
participant User
participant ProjectActions
participant TauriIO
participant AndroidFileSystem
participant StartupSnapshot
User->>ProjectActions: Open or save Android content URI project
ProjectActions->>TauriIO: Read project text and path
TauriIO->>AndroidFileSystem: Read content URI
AndroidFileSystem-->>TauriIO: Project text
TauriIO->>StartupSnapshot: Persist eligible snapshot
StartupSnapshot-->>ProjectActions: Snapshot write completes asynchronously
User->>TauriIO: Reopen project after process restart
TauriIO->>AndroidFileSystem: Read content URI
AndroidFileSystem-->>TauriIO: Read failure
TauriIO->>StartupSnapshot: Read matching snapshot
StartupSnapshot-->>TauriIO: Snapshot text
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Inline comments:
In `@apps/geolibre-desktop/src/lib/startup-project-snapshot.ts`:
- Around line 191-196: Update the startup snapshot size guard to measure UTF-8
bytes using TextEncoder().encode(text).byteLength instead of text.length, and
use that byte count in the warning. Add a boundary test covering multibyte text
exceeding MAX_STARTUP_SNAPSHOT_BYTES.
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Otherwise the design is sound: the slot-matching ( |
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- Refresh the restorable copy when a project is reopened from Open Recent. `loadProject` moves that path to the front of the recent list, so in "last" mode it becomes the project the next launch resolves to -- but the copy on disk still held whichever project was opened through the picker last, so its `sourcePath` no longer matched and the cold start fell back to the unavailable-project banner. Open A, open B, reopen A from the recent list was enough to hit it. `openRecentProjectFile` now returns the raw text alongside the parsed project so the caller can keep the copy in step without re-reading a URI whose grant may already be gone. - Measure the snapshot size limit in UTF-8 bytes rather than `text.length`. The string is written as UTF-8, so a project of three-byte characters (CJK layer names, accented attribute values in embedded GeoJSON) could be three times the limit and still pass. `exceedsStartupSnapshotLimit` bounds the byte count by the code-unit count first and only encodes when that is inconclusive, so the oversized projects the guard exists to reject are still rejected without allocating a second copy of them on a phone. Covered by a boundary test over ASCII, three-byte, and surrogate-pair text. - State in the capability comment that `mkdir` is already granted by `fs:default` (its `create-app-specific-dirs` set), so the missing `fs:allow-mkdir` next to the other explicit command permissions is deliberate rather than an oversight, and that without the scope entry the copies fail with "forbidden path". - Drop the claim that `MAX_STARTUP_SNAPSHOT_BYTES` "matches" the ceiling on a project fetched by URL. The two share a number today but bound different things -- a download buffered into memory versus a file kept on disk -- and neither has to move when the other does, so the wording now says that instead of implying an invariant nothing enforces.
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Inline comments:
In `@apps/geolibre-desktop/src/lib/startup-project-snapshot.ts`:
- Around line 217-219: Serialize startup snapshot persistence per
StartupSnapshotSlot so each file write and corresponding index update execute as
one ordered operation, preserving the latest project in the deterministic last
slot when callers fire and forget writes. Update the snapshot write flow around
exceedsStartupSnapshotLimit and add a delayed-I/O test proving an older write
completing last cannot overwrite the newer project’s restorable snapshot.
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- Serialize snapshot writes per slot. Callers fire these off without awaiting them, alongside opening or saving a project, so two projects can race for the same slot and whichever write landed last would win it. The recent list is updated synchronously as each project opens, so a slow first write finishing last would leave the slot holding a project the preference no longer resolves to, and the next cold start would find no copy matching the path it asks for. Chaining per slot makes the last write started the one that wins, which is the one the preference agrees with. The stored link swallows rejections so one failed copy cannot strand every later one behind it, while the caller still sees the real result. Covered by a test where the first write is delayed past the second.
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- Consult the stored copy before classifying a failed read as "the project is gone". On a real filesystem "no such file" means exactly that and the recent entry can be dropped; on a dead Android SAF grant it means nothing reliable, because providers differ in how they report one - the emulator's ExternalStorageProvider raises a SecurityException, but Drive, Downloads and some OEM file managers are known to report a revoked URI as a FileNotFoundException. Reaching `RecentProjectGoneError` on that makes `useStartupProject` forget the entry and reset a "specific" preference to the default, so a provider whose wording happened to match the missing-file regex would silently wipe the user's chosen startup project on exactly the failure the copy exists to survive. A copy for that exact path now wins; the "gone" classification is only reached when there is nothing to restore, so a genuinely deleted desktop project still drops out of the recent list as before. - Break the tie when both slots hold the same project by taking the newest `savedAt` rather than whichever slot is looked at first. Running in "specific" mode on a project and later switching to "last" leaves a copy in each slot and only refreshes the active one, so the fixed iteration order could return the older copy while a fresher one sat on disk. - Use one write queue for both slots instead of one each. The two slots share an index and each write reads it whole and stores it back after its own file write, so a "last" copy and a "specific" copy in flight together could both read the index before either stored it, and the one finishing last would drop the other's entry - leaving a good copy on disk that nothing points at. Copies are small and rare enough that serializing them costs nothing. Covered by a test with the two slots' writes overlapping.
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Inline comments:
In `@apps/geolibre-desktop/src/lib/startup-project-snapshot.ts`:
- Around line 297-300: Update readStartupSnapshot to retain all entries matching
sourcePath, order them by savedAt descending, and attempt io.read for each in
that order until one succeeds; continue past read failures and return null only
when no matching snapshot is readable. Add a test covering a missing newest slot
with a readable older snapshot.
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- Try an older copy when the newest one's file has gone missing. Picking the newest matching entry and giving up if its read fails could report the project as unavailable while a readable copy of the same project sat in the other slot. The matches are already sorted, so this is just reading down the list until one succeeds. Covered by a test where only the older slot's file survives.
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Good, already imported (build would've failed otherwise, and the PR presumably passes CI). That confirms no import issue. I've completed a thorough review. Let me finalize the summary. Code reviewBugs
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Overall this is a carefully reasoned, well-tested change; the one substantive concern is the untested save-after-snapshot-restore interaction with the existing Android write-fallback error matching. |
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- Move a pinned startup project to the document an ordinary Save landed on. Confirmed on the emulator: saving a project opened through the document picker is refused in place and falls back to the save dialog, and the document that dialog creates has a different URI - saving over `General_Project.geolibre.json` yields one ending `General_Project.geolibre.json (1)`. A "specific" preference pinned to the original therefore stopped matching after the very first save, so its copy was never refreshed again and every later launch restored the project as it looked when it was pinned, from a URI nothing could open. `startupSettingsAfterForcedSaveAs` follows the preference across, before the copy is written so that copy lands in the slot the moved preference resolves to. Narrow on purpose: it applies only when a plain Save changed the path by itself, which is the signature of that forced fallback. An explicit Save As is the user deliberately writing a different file and must not silently re-point a preference at it, and on desktop a plain Save never changes the path, so this never fires there. - Document the two Android consequences in the user guide: a project deleted from the device still reopens from GeoLibre's copy (Android reports a deleted file and an expired reference the same way, and treating it as deleted would wipe the user's startup preference), and saving a project opened from device storage asks where to save it once, with the preference following it there. Verified on an Android 16 emulator: pin a project as the startup project, open it, Save (the dialog appears and creates the "(1)" document), and the preference and its copy both move to it; force-stop and cold start reopens the saved project with no banner. Also confirmed Save after a snapshot-based restore still falls back to the save dialog rather than surfacing a raw error - the expired grant reports "Permission Denial", which `isUriWritePermissionError` matches.
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| for (const entry of entries) { | ||
| try { | ||
| return await io.read(entry.file); | ||
| } catch (error) { | ||
| // The index outlived its file (cleared app storage, a write that never | ||
| // landed). Try the next copy of the same project, if there is one. | ||
| console.warn("Could not read the stored copy of the startup project.", error); | ||
| } | ||
| } |
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This loop only guards against io.read rejecting (missing file); it doesn't validate that the bytes it returns actually parse as a project. The caller (openRecentProjectFile in tauri-io.ts, around its parseProject(snapshot) call) doesn't wrap that call in try/catch either.
If the newest slot's file was left truncated/corrupted by an interrupted write — plausible here specifically, since a snapshot write happens right before the very kind of process death this feature exists to survive — io.read succeeds (the file exists) but parseProject throws downstream. That exception isn't caught here or in the caller, so:
- the loop never falls through to try an older, possibly-valid entry for the same
sourcePath, and - the caller's
RecentProjectGoneError/generic-error handling is bypassed entirely, surfacing an unhandled parse/schema error instead of the intended graceful fallback.
Worth validating the content before returning it (e.g. try parseProject/JSON.parse here and continue to the next entry on failure) so a corrupted newest copy can't shadow a good older one or crash the restore path. Confidence: medium — plausible but not exercised by the current test suite.
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| /** | ||
| * Which startup preference a snapshot serves. One file per slot rather than one | ||
| * per project: the preference can only ever restore two projects (the one named | ||
| * by "specific" and whichever was used last), so a fixed pair needs no pruning | ||
| * -- and pruning would need a `fs:allow-remove` scope the app deliberately does | ||
| * not grant outside its own temp files. | ||
| */ |
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Minor data-retention note, not really a bug: because there's deliberately no cleanup path (no fs:allow-remove scope for this directory), a slot's file is only ever overwritten, never deleted. If a user pins a "specific"/"last" project (possibly with credentials they chose to "keep" during Save), then switches the startup preference back to "default" or stops opening/saving that Android project, the last copy written to that slot stays in $APPLOCALDATA/startup-projects indefinitely — outliving the preference that created it, with no UI affordance to clear it short of clearing app data. Same trust boundary as the original file (app-private storage), so not a new exposure to other apps, but worth being aware it's a persistent, unbounded-in-time copy of potentially sensitive project content. Confidence: low — flagging for awareness rather than as something that necessarily needs fixing in this PR.
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Both inline comments posted successfully. Now the final summary. Code reviewBugs
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On Android, both startup modes fell back to the default workspace on every cold start and showed "The startup project is unavailable."
Two things were in the way.
openRecentProjectFilesends the stored path to theread_project_fileTauri command, whose guard requires a filesystem path, so acontent://URI was refused before anything was read. Routing content URIs throughtauri-plugin-fsinstead (it resolves them via Android's ContentResolver) gets past that, but only until the process ends:tauri-plugin-dialog'sopen()launchesACTION_GET_CONTENT, whose read grant is tied to the activity that received it and cannot be renewed from inside the app - a persistable grant needsACTION_OPEN_DOCUMENTplustakePersistableUriPermission, neither of which the plugin issues. The startup restore runs exactly once per cold start, which is exactly when that grant is gone, so the feature could never work there. This is the read-side half of the problem #1833 fixed for saving.So GeoLibre keeps its own copy.
lib/startup-project-snapshot.tswrites the project text into the app's private data directory whenever the startup preference points at the project being opened or saved, andopenRecentProjectFilefalls back to that copy when the original URI can no longer be read. Two fixed slots ("specific" and "last") rather than one file per project: the preference can only ever restore two projects, and a fixed pair needs no pruning - which would need anfs:allow-removescope the app deliberately does not grant outside its own temp files.Committing the preference in Settings also copies the project right then, via
ensureStartupProjectSnapshot. That is the path the report describes - open a project, then ask for it back on the next launch - and nothing else re-reads the project in between, so without it the preference would be saved with no copy behind it.Everything is gated on the path being a content URI, so desktop keeps re-reading the real file and never doubles a project on disk. A copy over 25 MB is skipped rather than duplicating hundreds of megabytes of embedded vector data on a phone, measured in UTF-8 bytes since that is what the file holds. The source path must match exactly, so a copy can never stand in for a different project. Every failure is logged and swallowed: the copy is a fallback for a later launch and must never fail the open or save that triggered it.
One tradeoff is deliberate. The copy is consulted before a failed read is classified as "the project is gone", because Android reports a revoked reference and a deleted file the same way and the alternative is worse: reaching
RecentProjectGoneErrorthere makes GeoLibre forget the recent entry and reset a pinned startup project to the default, wiping the user's choice on exactly the failure this exists to survive. The cost is that a project genuinely deleted from the device keeps reopening from the copy instead of dropping out of the recent list. On desktop nothing changes, since those paths never have a copy.The
fs:scopeentry in the capability is required, not incidental. An fs permission's scope applies only to the commands that permission grants, sofs:default's app-directory scope reachesread_text_filebut notmkdirorwrite_text_file; without the entry every copy fails with "forbidden path" (caught on the emulator, not by inspection).Verified on an Android 16 emulator with the reporter's own steps and a project at the path from the report,
/sdcard/Documents/json/General_Project.geolibre.json: open it through the document picker, set the startup preference, force-stop, cold start. Before the change the log shows "Could not restore the startup project ... requires that you obtain access using ACTION_OPEN_DOCUMENT"; after it, both "Reopen the last project" and "Open a specific project" come back with the project, its layer, and its camera, no banner, and the log shows the fallback taking over from the dead URI.Fixes #1948