init: Add support for GSI installations in first-stage mount.
Bug: 121209697
Test: gsi boots
Change-Id: I69db0f8e999da366e46728b1008602f543cd79f6
diff --git a/init/Android.bp b/init/Android.bp
index c920dc2..3369fb9 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -77,6 +77,7 @@
"libext4_utils",
"libfs_mgr",
"libfscrypt",
+ "libgsi",
"libhidl-gen-utils",
"libkeyutils",
"liblog",
diff --git a/init/Android.mk b/init/Android.mk
index bdd0301..69c63e1 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -91,6 +91,7 @@
libz \
libselinux \
libcap \
+ libgsi \
LOCAL_SANITIZE := signed-integer-overflow
# First stage init is weird: it may start without stdout/stderr, and no /proc.
diff --git a/init/builtins.cpp b/init/builtins.cpp
index 4a66e46..0139317 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -54,6 +54,7 @@
#include <fs_mgr.h>
#include <fscrypt/fscrypt.h>
#include <fscrypt/fscrypt_init_extensions.h>
+#include <libgsi/libgsi.h>
#include <selinux/android.h>
#include <selinux/label.h>
#include <selinux/selinux.h>
@@ -520,6 +521,9 @@
return Success();
} else if (code == FS_MGR_MNTALL_DEV_NEEDS_RECOVERY) {
/* Setup a wipe via recovery, and reboot into recovery */
+ if (android::gsi::IsGsiRunning()) {
+ return Error() << "cannot wipe within GSI";
+ }
PLOG(ERROR) << "fs_mgr_mount_all suggested recovery, so wiping data via recovery.";
const std::vector<std::string> options = {"--wipe_data", "--reason=fs_mgr_mount_all" };
return reboot_into_recovery(options);
@@ -1022,7 +1026,8 @@
}
service->AddReapCallback([reboot_reason](const siginfo_t& siginfo) {
if (siginfo.si_code != CLD_EXITED || siginfo.si_status != 0) {
- if (fscrypt_is_native()) {
+ // TODO (b/122850122): support this in gsi
+ if (fscrypt_is_native() && !android::gsi::IsGsiRunning()) {
LOG(ERROR) << "Rebooting into recovery, reason: " << reboot_reason;
if (auto result = reboot_into_recovery(
{"--prompt_and_wipe_data", "--reason="s + reboot_reason});
diff --git a/init/first_stage_mount.cpp b/init/first_stage_mount.cpp
index 71fe401..affa39e 100644
--- a/init/first_stage_mount.cpp
+++ b/init/first_stage_mount.cpp
@@ -34,6 +34,7 @@
#include <fs_mgr.h>
#include <fs_mgr_dm_linear.h>
#include <fs_mgr_overlayfs.h>
+#include <libgsi/libgsi.h>
#include <liblp/liblp.h>
#include "devices.h"
@@ -79,6 +80,7 @@
bool IsDmLinearEnabled();
bool GetDmLinearMetadataDevice();
bool InitDmLinearBackingDevices(const android::fs_mgr::LpMetadata& metadata);
+ void UseGsiIfPresent();
ListenerAction UeventCallback(const Uevent& uevent);
@@ -207,6 +209,8 @@
}
required_devices_partition_names_.emplace(super_partition_name_);
+ // When booting from live GSI images, userdata is the super device.
+ required_devices_partition_names_.emplace("userdata");
return true;
}
@@ -410,6 +414,16 @@
// this case, we mount system first then pivot to it. From that point on,
// we are effectively identical to a system-as-root device.
bool FirstStageMount::TrySwitchSystemAsRoot() {
+ auto metadata_partition = std::find_if(fstab_.begin(), fstab_.end(), [](const auto& entry) {
+ return entry.mount_point == "/metadata";
+ });
+ if (metadata_partition != fstab_.end()) {
+ if (MountPartition(&(*metadata_partition))) {
+ fstab_.erase(metadata_partition);
+ UseGsiIfPresent();
+ }
+ }
+
auto system_partition = std::find_if(fstab_.begin(), fstab_.end(), [](const auto& entry) {
return entry.mount_point == "/system";
});
@@ -513,6 +527,40 @@
return true;
}
+void FirstStageMount::UseGsiIfPresent() {
+ std::string metadata_file, error;
+
+ if (!android::gsi::CanBootIntoGsi(&metadata_file, &error)) {
+ LOG(INFO) << "GSI " << error << ", proceeding with normal boot";
+ return;
+ }
+
+ auto metadata = android::fs_mgr::ReadFromImageFile(metadata_file.c_str());
+ if (!metadata) {
+ LOG(ERROR) << "GSI partition layout could not be read";
+ return;
+ }
+
+ if (!android::fs_mgr::CreateLogicalPartitions(*metadata.get(), "/dev/block/by-name/userdata")) {
+ LOG(ERROR) << "GSI partition layout could not be instantiated";
+ return;
+ }
+
+ if (!android::gsi::MarkSystemAsGsi()) {
+ PLOG(ERROR) << "GSI indicator file could not be written";
+ return;
+ }
+
+ // Replace the existing system fstab entry.
+ auto system_partition = std::find_if(fstab_.begin(), fstab_.end(), [](const auto& entry) {
+ return entry.mount_point == "/system";
+ });
+ if (system_partition != fstab_.end()) {
+ fstab_.erase(system_partition);
+ }
+ fstab_.emplace_back(BuildGsiSystemFstabEntry());
+}
+
bool FirstStageMountVBootV1::GetDmVerityDevices() {
std::string verity_loc_device;
need_dm_verity_ = false;