git subrepo clone https://github.com/Atmosphere-NX/libstratosphere stratosphere/libstratosphere

subrepo:
  subdir:   "stratosphere/libstratosphere"
  merged:   "0c5dab80"
upstream:
  origin:   "https://github.com/Atmosphere-NX/libstratosphere"
  branch:   "master"
  commit:   "0c5dab80"
git-subrepo:
  version:  "0.4.0"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "5d6aba9"

stratosphere/libstratosphere/source/updater/updater_paths.cpp

@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <switch.h>
+#include <stratosphere.hpp>
+#include <sys/stat.h>
+
+#include "updater_paths.hpp"
+
+namespace sts::updater {
+
+    namespace {
+
+        /* Actual paths. */
+        constexpr const char *BootImagePackageMountPath = "bip";
+        constexpr const char *BctPathNx = "bip:/nx/bct";
+        constexpr const char *Package1PathNx = "bip:/nx/package1";
+        constexpr const char *Package2PathNx = "bip:/nx/package2";
+        constexpr const char *BctPathA = "bip:/a/bct";
+        constexpr const char *Package1PathA = "bip:/a/package1";
+        constexpr const char *Package2PathA = "bip:/a/package2";
+
+        const char *ChooseCandidatePath(const char * const *candidates, size_t num_candidates) {
+            if (num_candidates == 0) {
+                std::abort();
+            }
+
+            for (size_t i = 0; i < num_candidates; i++) {
+                struct stat buf;
+                if (stat(candidates[i], &buf) != 0) {
+                    continue;
+                }
+
+                if (!S_ISREG(buf.st_mode)) {
+                    continue;
+                }
+
+                return candidates[i];
+            }
+
+            /* Nintendo just uses the last candidate if they all fail...should we abort? */
+            return candidates[num_candidates - 1];
+        }
+
+    }
+
+    const char *GetBootImagePackageMountPath() {
+        return BootImagePackageMountPath;
+    }
+
+
+    const char *GetBctPath(BootImageUpdateType boot_image_update_type) {
+        switch (boot_image_update_type) {
+            case BootImageUpdateType::Erista:
+                {
+                    constexpr const char *candidates[] = {BctPathNx};
+                    return ChooseCandidatePath(candidates, util::size(candidates));
+                }
+            case BootImageUpdateType::Mariko:
+                {
+                    constexpr const char *candidates[] = {BctPathA, BctPathNx};
+                    return ChooseCandidatePath(candidates, util::size(candidates));
+                }
+            default:
+                std::abort();
+        }
+    }
+
+    const char *GetPackage1Path(BootImageUpdateType boot_image_update_type) {
+        switch (boot_image_update_type) {
+            case BootImageUpdateType::Erista:
+                {
+                    constexpr const char *candidates[] = {Package1PathNx};
+                    return ChooseCandidatePath(candidates, util::size(candidates));
+                }
+            case BootImageUpdateType::Mariko:
+                {
+                    constexpr const char *candidates[] = {Package1PathA, Package1PathNx};
+                    return ChooseCandidatePath(candidates, util::size(candidates));
+                }
+            default:
+                std::abort();
+        }
+    }
+
+    const char *GetPackage2Path(BootImageUpdateType boot_image_update_type) {
+        switch (boot_image_update_type) {
+            case BootImageUpdateType::Erista:
+                {
+                    constexpr const char *candidates[] = {Package2PathNx};
+                    return ChooseCandidatePath(candidates, util::size(candidates));
+                }
+            case BootImageUpdateType::Mariko:
+                {
+                    constexpr const char *candidates[] = {Package2PathA, Package2PathNx};
+                    return ChooseCandidatePath(candidates, util::size(candidates));
+                }
+            default:
+                std::abort();
+        }
+    }
+
+}
+
+
+