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fix(android): give the app a home directory so it starts

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backend/system resolves config and data from $HOME or the OS
equivalent, and Android has neither: buildUserDirPath switches on
runtime.GOOS with cases for darwin, linux and windows and a default
returning errUnsupportedOS. So NewYellowJacketApp failed and main()
called os.Exit(1) about six milliseconds after the JNI bridge came up.

That failure is invisible in all three places anyone would look. There
is no panic, no AndroidRuntime stack and no tombstone, because os.Exit
is not a crash; Go's stdout does not reach logcat, so the slog line
naming the error is discarded; and ActivityManager respawns the process
fast enough that pidof always answers, so a crash-looping app looks
alive.

main() now sets the override before anything asks for a path.
application.Mobile.StoragePath() is the platform's own answer --
getFilesDir() on Android, Application Support on iOS -- and returns ""
on desktop, where UseHomeOverride is a no-op, so this needs no build
tag and changes nothing off mobile. resolveUserDirPath already honours
YJ_HOME on every OS, so there was a seam for it.

The knowledge stays in main(): backend/system gains no import of the
Wails application package, for the same reason backend/events is split
by the indexbuild tag.

UseHomeOverride's two rules are tested because nothing else would
notice them breaking. An empty base does nothing, which is exactly the
desktop case. And an override already set wins, so YJ_HOME still
relocates a sandbox on the one platform that would otherwise decide for
itself.

This is not the end of the port. The app now reaches the database and
takes SIGSYS on the x86_64 emulator -- modernc.org/libc issues a raw
lstat syscall on linux/amd64 and Android's seccomp forbids it. arm64,
which is what ships to phones, has no lstat syscall at all and routes
through fstatat, so it is structurally unaffected. See NOTES.md.
This commit is contained in:
logan
2026-08-16 16:25:20 -04:00
parent a7a33527c4
commit 0c7f34ab90
3 changed files with 75 additions and 0 deletions
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main.go
+15
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@@ -15,6 +15,7 @@ import (
"yellowjacket/backend/assets"
"yellowjacket/backend/config"
"yellowjacket/backend/profiling"
"yellowjacket/backend/system"
"yellowjacket/internal/dev"
)
@@ -28,6 +29,20 @@ var (
var frontendDistAssets embed.FS
func main() {
// **Mobile has no home directory, and this must run before anything
// asks for a path.** backend/system resolves config and data from
// $HOME or the OS equivalent, and on Android there is neither: its
// switch on runtime.GOOS took the default branch and returned
// errUnsupportedOS, so NewYellowJacketApp failed and main() exited
// six milliseconds after the JNI bridge came up -- with no panic and
// no tombstone, because os.Exit is not a crash.
//
// StoragePath() is the platform's own answer (getFilesDir() on
// Android, Application Support on iOS) and returns "" on desktop,
// where UseHomeOverride is then a no-op -- so this needs no build
// tag and changes nothing off mobile.
system.UseHomeOverride(application.Mobile.StoragePath())
// WebKitGTK's DMABuf renderer crashes on NVIDIA GPUs under Wayland.
// Only disable it for that specific combo so AMD/Intel and X11 users
// keep full hardware-accelerated buffer sharing. Users can also