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Fix Switch OTA launcher self-update via a bootstrap NRO.

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A running launcher cannot replace its own NRO on sdmc/FAT; stage the new
binary and chainload a tiny helper from romfs to swap it in before loading
the game.
This commit is contained in:
Andrew Quenehen
2026-08-06 09:59:01 -03:00
parent dd503706b0
commit 3fae3088ca
9 changed files with 204 additions and 9 deletions
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native/switch-ota-launcher/README.md
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@@ -68,7 +68,10 @@ Manifest: `scripts/switch/ota_launcher.manifest`.
## Status / known gaps
- Zip extraction uses `switch-zziplib` (`ota_unzip.c`) on device.
- OTA replaces launcher + game from the install zip (NACP versions stay aligned).
- OTA replaces game + launcher from the install zip (NACP versions stay aligned).
The running launcher cannot overwrite its own NRO on sdmc/FAT; a tiny
`ota-bootstrap.nro` (embedded in romfs) chainloads once to swap the staged
launcher, then loads the game.
- HTTPS uses Mozilla CA bundle in romfs (`cacert.pem`, fetched at build time). `ota_net_init()` mounts romfs before the quiet release check.
- Sphaira HOME forwarders cache metadata until reinstalled (see docs/switch-install.md).
- Release runner: `switch-dev` + (`install_devkitpro_deps.sh` **or** Docker)