Keep multiple kernel logs
Currently we are keeping one copy of the kernel log (LAST_KMSG_FILE).
This CL changes to keep up to KEEP_LOG_COUNT copies for kernel logs.
Bug: http://b/18092237
Change-Id: I1bf5e230de3efd6a48a5b2ae5a34241cb4d9ca90
diff --git a/recovery.cpp b/recovery.cpp
index 65172df..2c78baf 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -31,6 +31,9 @@
#include <time.h>
#include <unistd.h>
+#include <base/file.h>
+#include <base/stringprintf.h>
+
#include "bootloader.h"
#include "common.h"
#include "cutils/properties.h"
@@ -65,8 +68,6 @@
{ NULL, 0, NULL, 0 },
};
-#define LAST_LOG_FILE "/cache/recovery/last_log"
-
static const char *CACHE_LOG_DIR = "/cache/recovery";
static const char *COMMAND_FILE = "/cache/recovery/command";
static const char *INTENT_FILE = "/cache/recovery/intent";
@@ -78,9 +79,8 @@
static const char *TEMPORARY_LOG_FILE = "/tmp/recovery.log";
static const char *TEMPORARY_INSTALL_FILE = "/tmp/last_install";
static const char *LAST_KMSG_FILE = "/cache/recovery/last_kmsg";
-#define KLOG_DEFAULT_LEN (64 * 1024)
-
-#define KEEP_LOG_COUNT 10
+static const char *LAST_LOG_FILE = "/cache/recovery/last_log";
+static const int KEEP_LOG_COUNT = 10;
RecoveryUI* ui = NULL;
char* locale = NULL;
@@ -267,72 +267,55 @@
set_bootloader_message(&boot);
}
-// read from kernel log into buffer and write out to file
-static void
-save_kernel_log(const char *destination) {
- int n;
- char *buffer;
- int klog_buf_len;
- FILE *log;
-
- klog_buf_len = klogctl(KLOG_SIZE_BUFFER, 0, 0);
+// Read from kernel log into buffer and write out to file.
+static void save_kernel_log(const char* destination) {
+ int klog_buf_len = klogctl(KLOG_SIZE_BUFFER, 0, 0);
if (klog_buf_len <= 0) {
- LOGE("Error getting klog size (%s), using default\n", strerror(errno));
- klog_buf_len = KLOG_DEFAULT_LEN;
- }
-
- buffer = (char *)malloc(klog_buf_len);
- if (!buffer) {
- LOGE("Can't alloc %d bytes for klog buffer\n", klog_buf_len);
+ LOGE("Error getting klog size: %s\n", strerror(errno));
return;
}
- n = klogctl(KLOG_READ_ALL, buffer, klog_buf_len);
- if (n < 0) {
- LOGE("Error in reading klog (%s)\n", strerror(errno));
- free(buffer);
+ std::string buffer(klog_buf_len, 0);
+ int n = klogctl(KLOG_READ_ALL, &buffer[0], klog_buf_len);
+ if (n == -1) {
+ LOGE("Error in reading klog: %s\n", strerror(errno));
return;
}
-
- log = fopen_path(destination, "w");
- if (log == NULL) {
- LOGE("Can't open %s\n", destination);
- free(buffer);
- return;
- }
- fwrite(buffer, n, 1, log);
- check_and_fclose(log, destination);
- free(buffer);
+ buffer.resize(n);
+ android::base::WriteStringToFile(buffer, destination);
}
// How much of the temp log we have copied to the copy in cache.
static long tmplog_offset = 0;
-static void
-copy_log_file(const char* source, const char* destination, int append) {
- FILE *log = fopen_path(destination, append ? "a" : "w");
- if (log == NULL) {
+static void copy_log_file(const char* source, const char* destination, bool append) {
+ FILE* dest_fp = fopen_path(destination, append ? "a" : "w");
+ if (dest_fp == nullptr) {
LOGE("Can't open %s\n", destination);
} else {
- FILE *tmplog = fopen(source, "r");
- if (tmplog != NULL) {
+ FILE* source_fp = fopen(source, "r");
+ if (source_fp != nullptr) {
if (append) {
- fseek(tmplog, tmplog_offset, SEEK_SET); // Since last write
+ fseek(source_fp, tmplog_offset, SEEK_SET); // Since last write
}
char buf[4096];
- while (fgets(buf, sizeof(buf), tmplog)) fputs(buf, log);
- if (append) {
- tmplog_offset = ftell(tmplog);
+ size_t bytes;
+ while ((bytes = fread(buf, 1, sizeof(buf), source_fp)) != 0) {
+ fwrite(buf, 1, bytes, dest_fp);
}
- check_and_fclose(tmplog, source);
+ if (append) {
+ tmplog_offset = ftell(source_fp);
+ }
+ check_and_fclose(source_fp, source);
}
- check_and_fclose(log, destination);
+ check_and_fclose(dest_fp, destination);
}
}
-// Rename last_log -> last_log.1 -> last_log.2 -> ... -> last_log.$max
-// Overwrites any existing last_log.$max.
-static void rotate_last_logs(int max) {
+// Rename last_log -> last_log.1 -> last_log.2 -> ... -> last_log.$max.
+// Similarly rename last_kmsg -> last_kmsg.1 -> ... -> last_kmsg.$max.
+// Overwrite any existing last_log.$max and last_kmsg.$max.
+static void rotate_logs(int max) {
// Logs should only be rotated once.
static bool rotated = false;
if (rotated) {
@@ -340,14 +323,19 @@
}
rotated = true;
ensure_path_mounted(LAST_LOG_FILE);
+ ensure_path_mounted(LAST_KMSG_FILE);
- char oldfn[256];
- char newfn[256];
for (int i = max-1; i >= 0; --i) {
- snprintf(oldfn, sizeof(oldfn), (i==0) ? LAST_LOG_FILE : (LAST_LOG_FILE ".%d"), i);
- snprintf(newfn, sizeof(newfn), LAST_LOG_FILE ".%d", i+1);
- // ignore errors
- rename(oldfn, newfn);
+ std::string old_log = android::base::StringPrintf((i == 0) ? "%s" : "%s.%d",
+ LAST_LOG_FILE, i);
+ std::string new_log = android::base::StringPrintf("%s.%d", LAST_LOG_FILE, i+1);
+ // Ignore errors if old_log doesn't exist.
+ rename(old_log.c_str(), new_log.c_str());
+
+ std::string old_kmsg = android::base::StringPrintf((i == 0) ? "%s" : "%s.%d",
+ LAST_KMSG_FILE, i);
+ std::string new_kmsg = android::base::StringPrintf("%s.%d", LAST_KMSG_FILE, i+1);
+ rename(old_kmsg.c_str(), new_kmsg.c_str());
}
}
@@ -360,7 +348,7 @@
return;
}
- rotate_last_logs(KEEP_LOG_COUNT);
+ rotate_logs(KEEP_LOG_COUNT);
// Copy logs to cache so the system can find out what happened.
copy_log_file(TEMPORARY_LOG_FILE, LOG_FILE, true);
@@ -439,9 +427,10 @@
saved_log_file* head = NULL;
if (is_cache) {
- // If we're reformatting /cache, we load any
- // "/cache/recovery/last*" files into memory, so we can restore
- // them after the reformat.
+ // If we're reformatting /cache, we load any past logs
+ // (i.e. "/cache/recovery/last_*") and the current log
+ // ("/cache/recovery/log") into memory, so we can restore them after
+ // the reformat.
ensure_path_mounted(volume);
@@ -454,7 +443,7 @@
strcat(path, "/");
int path_len = strlen(path);
while ((de = readdir(d)) != NULL) {
- if (strncmp(de->d_name, "last", 4) == 0) {
+ if (strncmp(de->d_name, "last_", 5) == 0 || strcmp(de->d_name, "log") == 0) {
saved_log_file* p = (saved_log_file*) malloc(sizeof(saved_log_file));
strcpy(path+path_len, de->d_name);
p->name = strdup(path);
@@ -712,38 +701,40 @@
}
static void choose_recovery_file(Device* device) {
- unsigned int i;
- unsigned int n;
- static const char** title_headers = NULL;
- char *filename;
- // "Go back" + LAST_KMSG_FILE + KEEP_LOG_COUNT + terminating NULL entry
- char* entries[KEEP_LOG_COUNT + 3];
+ // "Go back" + KEEP_LOG_COUNT * 2 + terminating nullptr entry
+ char* entries[KEEP_LOG_COUNT * 2 + 2];
memset(entries, 0, sizeof(entries));
- n = 0;
+ unsigned int n = 0;
entries[n++] = strdup("Go back");
- // Add kernel kmsg file if available
- if ((ensure_path_mounted(LAST_KMSG_FILE) == 0) && (access(LAST_KMSG_FILE, R_OK) == 0)) {
- entries[n++] = strdup(LAST_KMSG_FILE);
- }
-
// Add LAST_LOG_FILE + LAST_LOG_FILE.x
- for (i = 0; i < KEEP_LOG_COUNT; i++) {
- char *filename;
- if (asprintf(&filename, (i==0) ? LAST_LOG_FILE : (LAST_LOG_FILE ".%d"), i) == -1) {
+ // Add LAST_KMSG_FILE + LAST_KMSG_FILE.x
+ for (int i = 0; i < KEEP_LOG_COUNT; i++) {
+ char* log_file;
+ if (asprintf(&log_file, (i == 0) ? "%s" : "%s.%d", LAST_LOG_FILE, i) == -1) {
// memory allocation failure - return early. Should never happen.
return;
}
- if ((ensure_path_mounted(filename) != 0) || (access(filename, R_OK) == -1)) {
- free(filename);
- entries[n++] = NULL;
- break;
+ if ((ensure_path_mounted(log_file) != 0) || (access(log_file, R_OK) == -1)) {
+ free(log_file);
+ } else {
+ entries[n++] = log_file;
}
- entries[n++] = filename;
+
+ char* kmsg_file;
+ if (asprintf(&kmsg_file, (i == 0) ? "%s" : "%s.%d", LAST_KMSG_FILE, i) == -1) {
+ // memory allocation failure - return early. Should never happen.
+ return;
+ }
+ if ((ensure_path_mounted(kmsg_file) != 0) || (access(kmsg_file, R_OK) == -1)) {
+ free(kmsg_file);
+ } else {
+ entries[n++] = kmsg_file;
+ }
}
- const char* headers[] = { "Select file to view", NULL };
+ const char* headers[] = { "Select file to view", nullptr };
while (true) {
int chosen_item = get_menu_selection(headers, entries, 1, 0, device);
@@ -755,7 +746,7 @@
redirect_stdio(TEMPORARY_LOG_FILE);
}
- for (i = 0; i < (sizeof(entries) / sizeof(*entries)); i++) {
+ for (size_t i = 0; i < (sizeof(entries) / sizeof(*entries)); i++) {
free(entries[i]);
}
}