feat: treat a Lakka card as a card setup

Lakka keeps its BIOS on its STORAGE partition (/storage/system). A computer now tells that partition by the retroarch.cfg RetroArch writes there, whose system_directory is Lakka's /tmp/system overlay, and --platform lakka on a computer asks for the card instead of writing to /storage/system here.

install.ps1

@@ -16,7 +16,7 @@
     # and Invoke-WebRequest throws on a cut transfer before the hash is read:
     # the site's build rewrites this line there (scripts/sitebootstrap.py).
     $mismatchAdvice = "The download was most likely cut short: try again. Within minutes of an update of this project the two files can come from caches of different ages. Waiting five minutes settles that."
-    $defaultInstallSha256 = "4d5fbd4fcf4fc42e4ae02ebfa568fd906ef673d003eefcae22e38e520d70c243"
+    $defaultInstallSha256 = "78ef177611168c1c7699cafa8982f901aaaf5342b6c55d6e158ba18fb4cc0ae2"
     $maximumInstallerBytes = 2MB
     $installerExit = 0
     $installer = if ($PSScriptRoot) { Join-Path $PSScriptRoot "install.py" } else { $null }

install.py

@@ -13868,6 +13868,18 @@ _SHARE_RULES: tuple[_OsRule, ...] = (
     _OsRule("rocknix", "ROCKNIX", "file_matches",
             (".config/system/configs/system.cfg", r"^root\.password=rocknix\s*$"),
             "roms/bios"),
+    # Lakka's is /storage, its STORAGE partition (Lakka-LibreELEC v6.1,
+    # packages/sysutils/busybox/scripts/fs-resize:31). RetroArch reads its
+    # BIOS through /tmp/system, an overlay whose upper folder is
+    # /storage/system (packages/lakka/retroarch_base/retroarch/system.d/
+    # tmp-system.mount:12). With HOME=/storage (config/retroarch-env.conf:1)
+    # RetroArch writes .config/retroarch/retroarch.cfg from the /etc
+    # skeleton at its first start (RetroArch 69a4f0ea, configuration.c:
+    # 3650-3676), whose system_directory is that overlay (config/
+    # retroarch.cfg:3217): no other system we install for reads /tmp/system.
+    _OsRule("lakka", "Lakka", "file_matches",
+            (".config/retroarch/retroarch.cfg",
+             r'^system_directory = "/tmp/system"\s*$'), "system"),
     # MiSTer's is its exFAT partition, /media/fat (Main_MiSTer e0a234f9,
     # file_io.cpp:1177), whose root holds the MiSTer binary and menu.rbf
     # (Distribution_MiSTer ce602319) and which reads each core's files
@@ -19449,7 +19461,7 @@ def setup_list(setups: list, mounted: set, needle: str = "",
 # The systems that run from an SD card on a board kept on a desk, not in
 # the hand: their row stays among the platforms, and the handhelds' block,
 # which leads when nothing is found here, keeps Onion four presses away.
-_DESK_CARDS = frozenset({"misterfpga"})
+_DESK_CARDS = frozenset({"misterfpga", "lakka"})
 
 # The setups a computer runs, by its system, first in the setup list when
 # nothing was found here. RetroBat runs on Windows alone (retrobat.org), and

install.sh

@@ -23,7 +23,7 @@ DEFAULT_INSTALL_URL="https://raw.githubusercontent.com/Abdess/retrobios/main/ins
 # curl or wget stop on a cut transfer before the hash is read: the site's
 # build rewrites this line there (scripts/sitebootstrap.py).
 MISMATCH_ADVICE="The download was most likely cut short: try again. Within minutes of an update of this project the two files can come from caches of different ages. Waiting five minutes settles that."
-DEFAULT_INSTALL_SHA256="4d5fbd4fcf4fc42e4ae02ebfa568fd906ef673d003eefcae22e38e520d70c243"
+DEFAULT_INSTALL_SHA256="78ef177611168c1c7699cafa8982f901aaaf5342b6c55d6e158ba18fb4cc0ae2"
 MAX_INSTALLER_BYTES=2097152
 
 cleanup() {

install/launchers/index.json

@@ -27,8 +27,8 @@
         {
           "dest": "roms/ports/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 1099572,
+          "size": 1100388,
-          "sha256": "4d5fbd4fcf4fc42e4ae02ebfa568fd906ef673d003eefcae22e38e520d70c243",
+          "sha256": "78ef177611168c1c7699cafa8982f901aaaf5342b6c55d6e158ba18fb4cc0ae2",
           "executable": false
         },
         {
@@ -71,8 +71,8 @@
     "muos": {
       "archive": {
         "dest": "ARCHIVE/RetroBIOS.muxapp",
-        "size": 1153199,
+        "size": 1154015,
-        "sha256": "284143d1c9bed3becfbe1ecee2e690cd11dc0ee495c8beeb9d7dca70cd63622e"
+        "sha256": "03bcbdf8385808576afb0899860e5f11af37a9aee709b72481064e7a0ee79afa"
       },
       "members": [
         {
@@ -92,8 +92,8 @@
         {
           "name": "RetroBIOS/install.py",
           "repo_path": "install.py",
-          "size": 1099572,
+          "size": 1100388,
-          "sha256": "4d5fbd4fcf4fc42e4ae02ebfa568fd906ef673d003eefcae22e38e520d70c243",
+          "sha256": "78ef177611168c1c7699cafa8982f901aaaf5342b6c55d6e158ba18fb4cc0ae2",
           "executable": false
         },
         {
@@ -166,8 +166,8 @@
         {
           "dest": ".config/modules/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 1099572,
+          "size": 1100388,
-          "sha256": "4d5fbd4fcf4fc42e4ae02ebfa568fd906ef673d003eefcae22e38e520d70c243",
+          "sha256": "78ef177611168c1c7699cafa8982f901aaaf5342b6c55d6e158ba18fb4cc0ae2",
           "executable": false
         },
         {

tests/test_install_tui.py

@@ -2284,6 +2284,10 @@ class CardsSpaceAndConfirm(unittest.TestCase):
                    "bios"),
         "ROCKNIX": ({".config/system/configs/system.cfg": "root.password=rocknix\n"},
                     "rocknix", "roms/bios"),
+        # Lakka's STORAGE partition, once RetroArch has written its config.
+        "Lakka": ({".config/retroarch/retroarch.cfg":
+                   'menu_driver = "xmb"\nsystem_directory = "/tmp/system"\n'},
+                  "lakka", "system"),
     }
 
     def card(self, files: dict) -> Path:

wiki/installer.md

@@ -1101,6 +1101,7 @@ gives for the device, below the card's root instead of its mount point:
 | `system/configs/emulationstation/about.info` holding the line `KNULLI` | KNULLI | `bios`, KNULLI's list |
 | `system/batocera.conf` holding the line `system.hostname=KNULLI` | KNULLI | `bios`, KNULLI's list |
 | `.config/system/configs/system.cfg` holding the line `root.password=rocknix` | ROCKNIX | `roms/bios`, ROCKNIX's list |
+| `.config/retroarch/retroarch.cfg` holding the line `system_directory = "/tmp/system"` | Lakka | `system`, Lakka's list |
 | `MiSTer`, `menu.rbf` | MiSTer FPGA | `games`, MiSTer FPGA's list |
 | `MUOS/` | muOS | `MUOS/bios`, RetroArch's list |
 | `spruce/` | spruceOS | `BIOS`, RetroArch's list |
@@ -1225,7 +1226,7 @@ beside its executable wherever the archive was extracted, so a forced
 `--platform bizhawk` that finds no install stops and asks for `--dest`.
 
 The systems that run from an SD card keep their files there: MinUI, NextUI,
-MyMinUI, KNULLI, ROCKNIX, MiSTer FPGA, AmberELEC and EmuELEC (the card's games part, which
+MyMinUI, KNULLI, ROCKNIX, Lakka (its STORAGE partition, which a Linux computer reads, once Lakka has started once), MiSTer FPGA, AmberELEC and EmuELEC (the card's games part, which
 they mount as `/storage/roms`), and each system of the
 [Linux handhelds](../platforms/linux-handhelds.md) that gets RetroArch's list
 (Onion, muOS, spruceOS, ArkOS, UnofficialOS and the others). Run on the