fastbootd: Add command to remove GSI installs

Note: this only removes the bootable marker, since we're unable to
remove the userdata files within recovery.

Bug: 121210348
Test: fastboot gsi wipe
      fastboot gsi disable
Change-Id: I64fe848c787d426ae9d18a1557a9d6b340bfc2cf

fastboot/Android.bp

@@ -132,6 +132,7 @@ cc_binary {
         "libext2_uuid",
         "libext4_utils",
         "libfs_mgr",
+        "libgsi",
         "libhidlbase",
         "libhidltransport",
         "libhwbinder",

fastboot/constants.h

@@ -33,6 +33,7 @@
 #define FB_CMD_RESIZE_PARTITION "resize-logical-partition"
 #define FB_CMD_UPDATE_SUPER "update-super"
 #define FB_CMD_OEM "oem"
+#define FB_CMD_GSI "gsi"
 
 #define RESPONSE_OKAY "OKAY"
 #define RESPONSE_FAIL "FAIL"

fastboot/device/commands.cpp

@@ -28,6 +28,7 @@
 #include <cutils/android_reboot.h>
 #include <ext4_utils/wipe.h>
 #include <fs_mgr.h>
+#include <libgsi/libgsi.h>
 #include <liblp/builder.h>
 #include <liblp/liblp.h>
 #include <uuid/uuid.h>
@@ -460,3 +461,22 @@ bool UpdateSuperHandler(FastbootDevice* device, const std::vector<std::string>&
     bool wipe = (args.size() >= 3 && args[2] == "wipe");
     return UpdateSuper(device, args[1], wipe);
 }
+
+bool GsiHandler(FastbootDevice* device, const std::vector<std::string>& args) {
+    if (!android::gsi::IsGsiInstalled()) {
+        return device->WriteStatus(FastbootResult::FAIL, "No GSI is installed");
+    }
+    if (args.size() != 2) {
+        return device->WriteFail("Invalid arguments");
+    }
+    if (args[1] == "wipe") {
+        if (!android::gsi::UninstallGsi()) {
+            return device->WriteStatus(FastbootResult::FAIL, strerror(errno));
+        }
+    } else if (args[1] == "disable") {
+        if (!android::gsi::DisableGsi()) {
+            return device->WriteStatus(FastbootResult::FAIL, strerror(errno));
+        }
+    }
+    return device->WriteStatus(FastbootResult::OKAY, "Success");
+}

fastboot/device/commands.h

@@ -48,3 +48,4 @@ bool DeletePartitionHandler(FastbootDevice* device, const std::vector<std::strin
 bool ResizePartitionHandler(FastbootDevice* device, const std::vector<std::string>& args);
 bool UpdateSuperHandler(FastbootDevice* device, const std::vector<std::string>& args);
 bool OemCmdHandler(FastbootDevice* device, const std::vector<std::string>& args);
+bool GsiHandler(FastbootDevice* device, const std::vector<std::string>& args);

fastboot/device/fastboot_device.cpp

@@ -53,6 +53,7 @@ FastbootDevice::FastbootDevice()
               {FB_CMD_RESIZE_PARTITION, ResizePartitionHandler},
               {FB_CMD_UPDATE_SUPER, UpdateSuperHandler},
               {FB_CMD_OEM, OemCmdHandler},
+              {FB_CMD_GSI, GsiHandler},
       }),
       transport_(std::make_unique<ClientUsbTransport>()),
       boot_control_hal_(IBootControl::getService()),

fastboot/fastboot.cpp

@@ -387,6 +387,7 @@ static int show_help() {
             "                            Format a flash partition.\n"
             " set_active SLOT            Set the active slot.\n"
             " oem [COMMAND...]           Execute OEM-specific command.\n"
+            " gsi wipe|disable           Wipe or disable a GSI installation (fastbootd only).\n"
             "\n"
             "boot image:\n"
             " boot KERNEL [RAMDISK [SECOND]]\n"
@@ -1926,6 +1927,16 @@ int FastBootTool::Main(int argc, char* argv[]) {
             std::string partition = next_arg(&args);
             std::string size = next_arg(&args);
             fb->ResizePartition(partition, size);
+        } else if (command == "gsi") {
+            if (args.empty()) {
+                syntax_error("missing 'wipe' or 'disable' argument");
+            } else if (args.size() == 1 && args[0] == "wipe") {
+                fb->RawCommand("gsi:wipe", "wiping GSI");
+            } else if (args.size() == 1 && args[0] == "disable") {
+                fb->RawCommand("gsi:disable", "disabling GSI");
+            } else {
+                syntax_error("expected 'wipe' or 'disable'");
+            }
         } else {
             syntax_error("unknown command %s", command.c_str());
         }