recovery: Handle devices without /cache partition.
Since we may not have /cache partition on A/B devices, let recovery
handle /cache related operations gracefully if /cache doesn't exist.
(1) Disable the wipe for /cache partition.
(2) Skip wiping /cache while wiping /data (i.e. factory reset).
(3) Disable logging-related features, until we figure out better
ways / places to store recovery logs (mainly for factory resets on A/B
devices).
Bug: 27176738
Change-Id: I7b14e53ce18960fe801ddfc15380dac6ceef1198
diff --git a/recovery.cpp b/recovery.cpp
index 3ce2185..9d6f511 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -98,6 +98,7 @@
char* stage = NULL;
char* reason = NULL;
bool modified_flash = false;
+static bool has_cache = false;
/*
* The recovery tool communicates with the main system through /cache files.
@@ -310,8 +311,8 @@
}
}
- // --- if that doesn't work, try the command file
- if (*argc <= 1) {
+ // --- if that doesn't work, try the command file (if we have /cache).
+ if (*argc <= 1 && has_cache) {
FILE *fp = fopen_path(COMMAND_FILE, "r");
if (fp != NULL) {
char *token;
@@ -433,6 +434,11 @@
}
static void copy_logs() {
+ // We can do nothing for now if there's no /cache partition.
+ if (!has_cache) {
+ return;
+ }
+
// We only rotate and record the log of the current session if there are
// actual attempts to modify the flash, such as wipes, installs from BCB
// or menu selections. This is to avoid unnecessary rotation (and
@@ -464,7 +470,7 @@
static void
finish_recovery(const char *send_intent) {
// By this point, we're ready to return to the main system...
- if (send_intent != NULL) {
+ if (send_intent != NULL && has_cache) {
FILE *fp = fopen_path(INTENT_FILE, "w");
if (fp == NULL) {
LOGE("Can't open %s\n", INTENT_FILE);
@@ -477,7 +483,7 @@
// Save the locale to cache, so if recovery is next started up
// without a --locale argument (eg, directly from the bootloader)
// it will use the last-known locale.
- if (locale != NULL) {
+ if (locale != NULL && has_cache) {
LOGI("Saving locale \"%s\"\n", locale);
FILE* fp = fopen_path(LOCALE_FILE, "w");
fwrite(locale, 1, strlen(locale), fp);
@@ -494,12 +500,13 @@
set_bootloader_message(&boot);
// Remove the command file, so recovery won't repeat indefinitely.
- if (ensure_path_mounted(COMMAND_FILE) != 0 ||
- (unlink(COMMAND_FILE) && errno != ENOENT)) {
- LOGW("Can't unlink %s\n", COMMAND_FILE);
+ if (has_cache) {
+ if (ensure_path_mounted(COMMAND_FILE) != 0 || (unlink(COMMAND_FILE) && errno != ENOENT)) {
+ LOGW("Can't unlink %s\n", COMMAND_FILE);
+ }
+ ensure_path_unmounted(CACHE_ROOT);
}
- ensure_path_unmounted(CACHE_ROOT);
sync(); // For good measure.
}
@@ -768,7 +775,7 @@
bool success =
device->PreWipeData() &&
erase_volume("/data") &&
- erase_volume("/cache") &&
+ (has_cache ? erase_volume("/cache") : true) &&
device->PostWipeData();
ui->Print("Data wipe %s.\n", success ? "complete" : "failed");
return success;
@@ -776,6 +783,11 @@
// Return true on success.
static bool wipe_cache(bool should_confirm, Device* device) {
+ if (!has_cache) {
+ ui->Print("No /cache partition found.\n");
+ return false;
+ }
+
if (should_confirm && !yes_no(device, "Wipe cache?", " THIS CAN NOT BE UNDONE!")) {
return false;
}
@@ -789,6 +801,11 @@
}
static void choose_recovery_file(Device* device) {
+ if (!has_cache) {
+ ui->Print("No /cache partition found.\n");
+ return;
+ }
+
// "Back" + KEEP_LOG_COUNT * 2 + terminating nullptr entry
char* entries[1 + KEEP_LOG_COUNT * 2 + 1];
memset(entries, 0, sizeof(entries));
@@ -1142,6 +1159,8 @@
printf("Starting recovery (pid %d) on %s", getpid(), ctime(&start));
load_volume_table();
+ has_cache = volume_for_path(CACHE_ROOT) != nullptr;
+
get_args(&argc, &argv);
const char *send_intent = NULL;
@@ -1182,7 +1201,7 @@
}
}
- if (locale == NULL) {
+ if (locale == nullptr && has_cache) {
load_locale_from_cache();
}
printf("locale is [%s]\n", locale);