ClaudeDo/docs/superpowers/specs/2026-04-15-installer-download-mode-design.md

# Installer: Download-Mode + Gitea Releases

Date: 2026-04-15
Status: Design — awaiting implementation plan

## Goal

Turn `ClaudeDo.Installer` into a self-contained tool that any user can run on
any Windows machine to install, update, reconfigure, repair, or uninstall
ClaudeDo. The installer pulls prebuilt binaries from a Gitea release on
`git.kuns.dev` instead of building from source.

End-user experience:

1. Download `ClaudeDo.Installer-<version>.exe` from the releases page.
2. Run it.
3. Done — no .NET SDK, no source checkout, no manual steps.

## Non-Goals

- Code signing the installer or the app binaries (future concern).
- Cross-platform installs (Windows-only, same as today).
- In-app update notifications (the installer handles updates when run; the app
  does not self-update).
- Arbitrary-version selection UI. Installer always targets "latest" release.
- A package-manager listing (winget/Chocolatey/Scoop). Future, separate spec.

## Current State (2026-04-15)

The existing installer (`src/ClaudeDo.Installer/`) is a WPF wizard that only
works from inside a source checkout on a machine with the .NET SDK installed:

- `PublishAppStep` runs `dotnet publish src/ClaudeDo.App/...`
- `PublishWorkerStep` runs `dotnet publish src/ClaudeDo.Worker/...`
- `DeployBinariesStep` copies `bin/Release/.../publish` into the install dir
- Subsequent steps (`WriteConfigStep`, `InitDatabaseStep`,
  `CreateShortcutsStep`, `RegisterServiceStep`) are fine to keep.

The installer also contains a partial "Settings" window
(`Views/SettingsWindow.xaml`, `Views/SettingsViewModel.cs`) — that wiring is
reused for the Config view shown on subsequent launches (see Mode detection
below).

## High-Level Design

Two pieces, each small:

**1) A Gitea Actions workflow** that, on every `v*` tag push, builds the App,
Worker, and Installer; packages them; and creates a Gitea Release on the
public repo at `git.kuns.dev/releases/ClaudeDo`.

The `releases/` org on the Gitea instance is world-readable without auth;
private work (including the source repo, if you want) lives under `kuns/*`
which is never public. The installer only needs to hit `releases/ClaudeDo`.

**2) An installer rewrite** that replaces the three publish/deploy steps with
a single `DownloadAndExtractStep`, detects existing installs via a marker
file, and on subsequent launches checks the Gitea API for updates before
deciding whether to show the Update flow or jump straight to the Config view.

## Release Artifacts

Each `v*` tag produces a Gitea Release with three assets:

```
ClaudeDo-<version>-win-x64.zip      # contains /app and /worker subdirs
ClaudeDo.Installer-<version>.exe    # self-contained installer (no .NET needed)
checksums.txt                       # SHA256 of the above
```

Decisions:

- **One combined app+worker zip** (not two separate). Reasons: one download,
  one extract, guaranteed version-locked pair.
- **Self-contained installer exe** — user does not need .NET installed.
- **App + Worker: self-contained** (`--self-contained true`, `-r win-x64`).
  Zero runtime dependency on the target machine, at the cost of a larger
  download (~100 MB combined zip). Decision: acceptable trade-off — the
  installer is one-click, not per-user-problem-to-debug.
- **Checksums file** — plain text, one line per asset (`<sha256>  <filename>`),
  verified by installer before extract.

The "latest installer exe" URL is stable:

```
https://git.kuns.dev/releases/ClaudeDo/releases/latest/download/ClaudeDo.Installer-<version>.exe
```

(Gitea also exposes `/releases/download/<tag>/<filename>` for specific
versions.)

## Gitea Actions Workflow

File: `.gitea/workflows/release.yml`

- **Trigger:** `push` on tags matching `v*`
- **Runner:** Linux container with .NET 8 SDK (`dotnet publish -r win-x64`
  works cross-platform). The installer itself requires Windows to run, but
  `dotnet publish` can target `win-x64` from Linux.
- **Steps:**
  1. Checkout
  2. Setup .NET 8 SDK
  3. Derive version from tag (`${{ gitea.ref_name }}` without the `v` prefix)
  4. `dotnet publish src/ClaudeDo.App -c Release -r win-x64 --self-contained true /p:Version=$VERSION -o out/app`
  5. `dotnet publish src/ClaudeDo.Worker -c Release -r win-x64 --self-contained true /p:Version=$VERSION -o out/worker`
  6. `dotnet publish src/ClaudeDo.Installer -c Release -r win-x64 --self-contained true /p:Version=$VERSION /p:PublishSingleFile=true -o out/installer`
  7. Zip `out/app` + `out/worker` as `ClaudeDo-<version>-win-x64.zip` with
     `app/` and `worker/` as top-level dirs
  8. Copy `out/installer/ClaudeDo.Installer.exe` to
     `ClaudeDo.Installer-<version>.exe`
  9. Generate `checksums.txt` (`sha256sum` both files)
  10. Create release via Gitea API using the built-in `${{ gitea.token }}`
     (this token has repo write scope automatically on Actions runs). Release
     name = tag name. Release notes = `git log` summary between previous tag
     and this one (nice-to-have).

The workflow needs **no custom secrets** — `gitea.token` is sufficient for
creating releases on its own repo.

## Installer Changes

### New: `install.json` marker file

Written at the end of every successful install or update to
`{InstallDir}/install.json`:

```json
{
  "version": "0.2.0",
  "installDir": "C:\\Program Files\\ClaudeDo",
  "workerDir": "C:\\Program Files\\ClaudeDo\\worker",
  "installedAt": "2026-04-15T12:34:56Z"
}
```

The installer reads this on startup (from the default install dir, or a
path supplied via CLI arg) to decide which mode to run in.

### Launch flow (`InstallModeDetector`)

On every launch, the installer checks for `install.json` first:

```
install.json absent?
  -> Install mode: Welcome -> Paths -> UiSettings -> Service -> Install
                  (writes install.json at the end)

install.json present?
  -> Query https://git.kuns.dev/api/v1/repos/releases/ClaudeDo/releases/latest
     (short timeout; if offline, treat as "no update available")

     latest.tag_name > installed.version
       -> Update mode: Welcome ("Update v0.1.0 -> v0.2.0, Update / Later")
          If user accepts -> Install steps (download + swap service)
          If user declines -> fall through to Config view
     latest.tag_name <= installed.version  (or API unreachable)
       -> Config view: directly open Paths/UiSettings/Service tabs,
          prefilled from existing ~/.todo-app/*.json.
          Action buttons: Save · Repair · Uninstall.
```

Key properties:

- **First run = wizard**, as today — no behavior change for new users.
- **Every subsequent run = update check first**, then either offer update or
  drop straight into Config. No "Manage page" with a menu of actions — the
  Config view *is* the default, and Repair/Uninstall are buttons on it.
- **Offline / API error = not fatal**: if the release endpoint can't be
  reached, the installer silently skips the update check and opens Config.
  The user is never blocked from managing an existing install by a network
  issue.
- **Downgrade** (installed version > latest) is treated the same as "no
  update available" — we don't ever offer a downgrade.

The installer's own version (shown for reference in Config) comes from its
assembly (`AssemblyInformationalVersion`), set by the workflow's
`/p:Version=$VERSION`. The *installed* version comes from `install.json`.

### New step: `DownloadAndExtractStep`

Replaces `PublishAppStep`, `PublishWorkerStep`, `DeployBinariesStep`.

```
1. GET https://git.kuns.dev/api/v1/repos/releases/ClaudeDo/releases/latest
   Parse tag_name and asset URLs for:
     - ClaudeDo-<ver>-win-x64.zip
     - checksums.txt
2. Download both to %TEMP%\ClaudeDo-install-<guid>\
3. Parse checksums.txt, verify SHA256 of the zip. Fail hard if mismatch.
4. (Update mode only) Stop Worker service via sc.exe stop ClaudeDoWorker.
   Wait up to 30s for it to actually stop. If it won't stop, fail.
5. (Update mode only) Delete contents of {InstallDir}/app and
   {InstallDir}/worker, but leave the directories and install.json in place.
6. Extract zip: /app -> {InstallDir}/app, /worker -> {InstallDir}/worker.
7. (Update mode only) Start service again via sc.exe start ClaudeDoWorker.
8. Progress is reported via IProgress<string> — the UI already shows it.
```

Config files (`~/.todo-app/*.json`) and DB (`~/.todo-app/todo.db`) live
outside `InstallDir` and are never touched by this step — updates are
naturally non-destructive.

### Update mode — which steps run

- **Yes:** `DownloadAndExtractStep`
- **No:** `WriteConfigStep` (user already has config — we don't overwrite)
- **No:** `InitDatabaseStep` (DB exists)
- **No:** `CreateShortcutsStep` (already there; Repair can re-run this)
- **Conditional:** `RegisterServiceStep` only if service is not currently
  registered (covers someone who unregistered it manually)

### Config view — actions

- **Save** (primary): writes the Paths / UiSettings / Service fields to
  `~/.todo-app/*.json`. If worker config changed, prompts "Restart service?"
  and calls `sc stop` / `sc start` if accepted. No download.
- **Repair:** re-download + extract (same as Update flow), re-create
  shortcuts, re-register service. Leaves config/DB alone. Confirmation
  dialog before starting.
- **Uninstall:** confirmation dialog ("This removes ClaudeDo *and* all of
  your tasks, config, and database. Type UNINSTALL to confirm."). On
  confirm:
  1. Stop + unregister service (`sc stop`, `sc delete ClaudeDoWorker`)
  2. Remove Start Menu / Desktop shortcuts
  3. Delete `{InstallDir}` (including `install.json`)
  4. Delete `~/.todo-app` in full (config + DB + logs)
  5. Exit

  Everything is removed. No "keep my data" option — that was explicitly
  declined in the design discussion.

### Files to add

```
src/ClaudeDo.Installer/Core/InstallModeDetector.cs
src/ClaudeDo.Installer/Core/ReleaseClient.cs        // Gitea API + downloads
src/ClaudeDo.Installer/Core/ChecksumVerifier.cs
src/ClaudeDo.Installer/Core/InstallManifest.cs      // read/write install.json
src/ClaudeDo.Installer/Steps/DownloadAndExtractStep.cs
src/ClaudeDo.Installer/Steps/WriteInstallManifestStep.cs
src/ClaudeDo.Installer/Steps/StopServiceStep.cs     // used in Update+Uninstall
src/ClaudeDo.Installer/Steps/StartServiceStep.cs    // used in Update+Repair
.gitea/workflows/release.yml
```

### Files to remove

```
src/ClaudeDo.Installer/Steps/PublishAppStep.cs
src/ClaudeDo.Installer/Steps/PublishWorkerStep.cs
src/ClaudeDo.Installer/Steps/DeployBinariesStep.cs
```

### Files to update

- `Core/InstallerService.cs` — mode-aware step list
- `Core/InstallContext.cs` — add `Version`, `Mode`, `IsFirstInstall` fields
- `Pages/WelcomePage/*` — content + buttons depend on mode
- `Views/WizardViewModel.cs` — route pages based on mode
- `Core/PageResolver.cs` — register new/renamed pages
- `ClaudeDo.Installer.csproj` — add `PublishSingleFile`, `SelfContained`
  properties (only active when published)

## Failure Modes & Recovery

| Failure                               | Behavior                                              |
|---------------------------------------|-------------------------------------------------------|
| No network / Gitea unreachable        | Step fails with clear message + retry button          |
| API returns no releases yet           | "No release available — publish a tag first"          |
| Checksum mismatch                     | Step fails, temp files deleted, user prompted retry   |
| Zip extraction fails mid-way (update) | InstallDir is left partially empty — user re-runs     |
| Service won't stop                    | Fail before extract; nothing destructive has happened |
| User cancels mid-download             | Temp dir cleaned up; install state unchanged          |

For safety, the `DownloadAndExtractStep` always downloads + verifies
**before** it deletes the old binaries. An aborted download cannot leave
an install in a half-deleted state.

## Security

- All downloads over HTTPS from a pinned host (`git.kuns.dev`).
- SHA256 verification before extract (protects against partial downloads and
  tampered caches on the wire; not a substitute for code signing).
- No tokens shipped in the installer — repo is public.
- Worker service runs under the same account as today (no change).

## Decisions to Revisit

1. **Release notes content.** Auto-generated `git log` summary vs manual
   notes in the tag message vs empty. Start empty; revisit when there are
   enough releases to care.

2. **Signed installer.** Out of scope for v1. Users will see a SmartScreen
   warning the first time. Note this in the README.

3. **Installer distribution page.** A simple `README.md` badge or a pinned
   "Latest release" link on the Gitea repo home is enough for v1.

## Success Criteria

- On a fresh Windows VM with **no source checkout, no .NET runtime, and no
  .NET SDK**:
  1. Download `ClaudeDo.Installer-<ver>.exe`.
  2. Run it.
  3. Complete the wizard.
  4. ClaudeDo App launches, Worker service is running, a task can be created
     and picked up.
- Running the same installer a second time, with no new release published,
  opens directly in the Config view after a quick update check.
- Publishing a new tag, then running the installer on the existing install,
  offers the update; accepting performs it without touching `~/.todo-app/todo.db`
  or the config JSONs.
- Uninstall leaves no trace: `{InstallDir}` gone, `~/.todo-app` gone, service
  unregistered, shortcuts removed.
- The entire release pipeline runs on `git.kuns.dev` with no manual steps
  beyond `git tag vX.Y.Z && git push --tags`.