miniSCP/docs/platform-notes.md

Platform notes — macOS / Windows / Linux behavior matrix

macOS is the primary target; Windows 11+ x64 and Linux x64 are beta targets (win-arm64 and linux-arm64 deferred). Every platform seam carries a PORTABILITY: comment at the branch site.

Seam inventory (where platform branches live)

Concern	File	mac	win	linux
Window chrome (modern skin)	src/bun/windows.ts, index.ts	hiddenInset + traffic-light offset, UI drag header	native titlebar, compact header	same as win
Window chrome (win7 skin)	src/bun/windows.ts chromeOptions	hidden (clears Titled → no traffic lights)	frameless	gtk_window_set_decorated(false)
Window resize	ui/.../7like/window-resize/	native frame resizes; win7 frameless uses the synthesized handles	as mac	as mac
External editor launch	src/bun/edits.ts launchEditor	open [-a app]	cmd /c start "" [app] file	app directly / xdg-open
Editor app picker	rpc-handlers.ts pickEditorApp	/Applications, .app	%ProgramFiles%, .exe	home, any
Owner/group names	fs/local.ts resolveId	id -nu + dscacheutil	undefined → "—"	id -nu + getent
Drive roots	fs/local.ts listLocalDrives	empty	fsutil fsinfo drives	empty
chmod/Permissions	context-menu.service.ts, file-panel, file-actions	full	hidden for LOCAL panels (only flips read-only); SFTP unaffected	full
Shell wording	ui context-menu.service.ts	Reveal in Finder / Move to Trash	Show in Explorer / Move to Recycle Bin	Show in File Manager
Shortcut labels	ui platform.ts MOD_LABEL/ALT_LABEL	⌘ / ⌥	Ctrl+ / Alt+	Ctrl+ / Alt+
Tray	src/bun/tray.ts	22 pt template PNG	16 px colored PNG	colored (needs AppIndicator, see below)
App menu	src/bun/menu.ts	full menu incl. About	none (early return) — About lives in the options popover	none (unsupported upstream)
connections.json protection	store/connections.ts	chmod 0600	icacls current-user ACL (0600 is meaningless)	0600
App data dir	store/paths.ts	~/Library/Application Support	%APPDATA%	$XDG_CONFIG_HOME/.config
ssh-agent	fs/sftp.ts	$SSH_AUTH_SOCK	\\.\pipe\openssh-ssh-agent fallback	$SSH_AUTH_SOCK
Paths in UI	ui format.ts joinPath/isRootPath	"/"	separator detected from the dir string; drive-root regex	"/"

The context menu is HTML on every platform (ui/src/app/skins/*/context-menu.ts + context-menu.service.ts), not a native electrobun menu — see the Linux section below for why. Only the three shell actions it can't do itself (reveal, open with the default app, copy path) cross to bun, via the shellItemAction RPC.

Remote (SFTP) paths are ALWAYS POSIX regardless of host or server OS (path.posix throughout fs/sftp.ts).

Frameless windows lose the WM's resize borders (win7 skin, every platform)

titleBarStyle: "hidden" is what lets 7.css draw the Aero caption — on Linux the GTK wrapper honours it with gtk_window_set_decorated(false). Undecorating also removes the window manager's resize borders and corner grips, and electrobun 1.18.1 offers no native resize gesture to put back: the shipped libNativeWrapper exports startWindowMove/stopWindowMove with no resize counterpart, does not link gtk_window_begin_resize_drag, and BrowserWindow has neither setResizable nor min-size constructor options. The window is still programmatically resizable (setFrame/getFrame work, and gtk_window_set_resizable(false) is never called), so the app synthesizes the input affordance: eight handles in the webview drag the native frame over RPC (ui/src/app/skins/7like/window-resize/).

That is a stopgap — each drag tick is an RPC hop plus an FFI call, where a real WM grab is compositor-side. scripts/check-electrobun-resize.ts watches the installed electrobun for the missing primitives and prints the removal checklist when they appear; it runs from postinstall, so an electrobun bump surfaces it without anyone remembering to look. The modern skin keeps the native frame and needs none of this.

Memory footprint (expected, not a bug)

Investigated 2026-07 — packaged build. Roughly ~200 MB macOS / ~300 MB Windows (Linux sits near macOS: WebKitGTK, like WKWebView, is lighter than Chromium), which is normal for a Bun + system-WebView app (30 MB is native / no-web-engine territory; Tauri-class apps run ~80–200 MB, Electron 150–400 MB). Not reducible to tens of MB without dropping the web UI.

• macOS splits across several "miniSCP" processes: the Bun main (~120 MB: backend + the bundled electrobun runtime + live SSH sessions — the largest and least reducible piece), the views://app WKWebView content process (~60 MB, the Angular UI), and the standard WebKit Networking / Graphics and Media helpers. All are one app; WebKit just names them per-role.
• Windows is higher because WebView2 is Chromium (multi-process: browser + GPU + renderer + utility + crashpad), vs macOS's lighter WKWebKit.
• Measure against a packaged build — bun run dev inflates the WebContent heap (ng-serve, unminified, sourcemaps, live-reload) and is not representative.
• Verified non-issues: transfers stream (no whole-file buffering), icons tree-shaken to ~33 glyphs, zoneless Angular, 364 KB prod bundle.
• Only real growth levers if this ever matters: the file list is not virtualized (a directory with tens of thousands of entries retains a DOM row each), and each open tab keeps both panels' full entries arrays; terminal transfers are retained until cleared. None affect normal use.

Linux runtime dependencies (REQUIRED — the app will not start without them)

electrobun's libNativeWrapper.so links AppIndicator hard for the tray, so a missing library is a hard boot failure (ERR_DLOPEN_FAILED out of bun:ffi dlopen), not a degraded tray. The transitive deps (libdbusmenu-glib, libdbusmenu-gtk3, libayatana-indicator3, libayatana-ido3) come in as package dependencies:

Distro	Install
Arch / CachyOS	sudo pacman -S libayatana-appindicator
Debian / Ubuntu	sudo apt install libayatana-appindicator3-1
Fedora	sudo dnf install libayatana-appindicator-gtk3

GTK/WebKit itself comes from the distro too — electrobun uses the system webview (bundleCEF: false), so webkit2gtk must be present.

Diagnosing a boot failure:

ldd build/dev-linux-x64/*/bin/libNativeWrapper.so | grep 'not found'

libasar.so => not found in that output is expected and harmless — it ships in the same bin/ folder and resolves at load time; only an unresolved libayatana-appindicator3.so.1 is fatal.

Tray visibility is a separate matter from linking: GNOME 3.26+ hides the legacy tray, so the icon needs the AppIndicator extension. KDE Plasma, XFCE, MATE and Cinnamon show it out of the box. The app runs fine either way — the tray is a convenience, and every action it offers exists in-app.

Linux known issues (upstream electrobun)

• No native menus of any kind. Application menus and showContextMenu are both no-ops (electrobun's dist/api/bun/proc/linux.md; the app logs "Application menus are not supported on Linux" at boot). The app menubar was already macOS-only, and the panel context menus are now HTML on every platform, so nothing is missing at the UI level — but do not add a feature that depends on a native menu.
• NVIDIA renders black without the DMABUF workaround. WebKitGTK can't allocate GBM buffers on the proprietary driver, so the window paints nothing while the log looks perfectly healthy. Every launch path sets WEBKIT_DISABLE_DMABUF_RENDERER=1 when /proc/driver/nvidia exists — scripts/linux-gpu.ts for dev, the miniSCP.sh wrapper in the tarball for releases. The app can't do it itself (Bun's process.env writes don't reach child processes); see gotchas.md.
• Benign startup noise: a deprecation warning pointing at libayatana-appindicator-glib. Not fatal.
• Unsigned, unpackaged: the release artifact is a portable tarball — no AppImage, .deb, .desktop entry or icon installation. Unpack and run miniSCP.sh (which execs bin/launcher).

First-Linux-boot smoke test

1. Install the AppIndicator package for your distro (table above), then bun run start. The window opens and actually renders the UI (a black window on NVIDIA means the DMABUF workaround didn't apply — check for Failed to create GBM buffer in the log), and the tray icon appears (or doesn't, on bare GNOME — that's the extension caveat, not a failure).
2. Right-click a file row: menu appears at the pointer, Send to Other Panel is first, Permissions is present, Escape / click-outside / arrow keys + Enter all work, and a right-click near the bottom-right flips the menu instead of overflowing.
3. Right-click empty panel space (New Folder / New File / Refresh / Show in File Manager) and a column header (checkmarks toggle columns live).
4. Copy Path puts the path on the clipboard; Show in File Manager opens the distro's file manager; Open (local file) launches the default app via xdg-open.
5. local↔remote transfers both directions; external editor round-trip (temp download → save → auto-upload) with the inotify watcher.
6. Move to Trash lands the item in the desktop's trash; connections.json is 0600.
7. bun scripts/release.ts --target linux-x64 produces release/linux-x64/miniSCP-Build<N>-linux-x64.tar.gz; unpack it elsewhere and run miniSCP.sh.

Windows known issues (upstream electrobun, documented not fixed)

• HiDPI blur — WebView2 renders at 1x on scaled displays (blackboardsh/electrobun#324, open). Most user-visible defect; wait for upstream DPI awareness.
• Notifications are legacy balloon style (Shell_NotifyIcon), not Windows toasts.
• Unsigned binaries — Setup.exe and the portable exe both trigger SmartScreen / Mark-of-the-Web on first run. No Authenticode support in electrobun 1.18.1 (signtool post-hook or electrobun-builder are options later). Installer unpacks to %LOCALAPPDATA%, desktop shortcut only — no Start Menu entry or uninstaller.
• hiddenInset degrades to hidden on Windows — irrelevant here because non-mac windows use the native titlebar.
• findInPage is a window.find() shim on WebView2 — irrelevant here, the editor find is custom.

First-Windows-boot smoke test

Code paths written blind (no Windows box was available); verify in order:

1. Build: bun scripts/release.ts --target win-x64 on the Windows machine — core binaries download from GitHub releases on first run; Setup.zip AND the portable zip appear under release/win-x64/ (the portable step warns instead of failing if the assembled-app folder layout differs — fix the appDir path in release.ts if so).
2. App boots, tray icon renders colored, window has a native titlebar.
3. Drives dropdown in each panel lists C:\ (+ others); navigating to a drive root hides the '..' row; the path bar shows consistent \ paths.
4. local↔remote transfers both directions; self-copy guard still blocks same-path copies.
5. External editor: default app opens via cmd /c start; the Choose… picker starts in Program Files and accepts an .exe; remote temp-edit → save → auto-upload works (directory watcher on NTFS).
6. Context menus: Send to Other Panel is the first row item; Show in Explorer, Move to Recycle Bin (item restorable from the bin), Copy Path; Permissions ABSENT on local rows, present on remote.
7. Ctrl+T/W/F/S and Ctrl+digit tab jumps; tooltips read "Ctrl+…".
8. connections.json ACL: icacls connections.json shows only the current user after saving a connection.
9. Editor/manager windows open, modal bounce works, About shows from the options popover.
10. Known-issue confirmation: HiDPI blur on a scaled display (expected until upstream fixes it).