recovery: Split main() into recovery_main.cpp.

This prepares for moving more codes from recovery into librecovery, so
that they will become more easily testable. recovery_main.cpp will be
the source code for recovery module, with the rest moved into
librecovery. recovery_main.cpp mainly does the initializations, such as
setting up the logger.

Test: mmma -j bootable/recovery
Test: recovery_component_test
Test: Build and boot into recovery image on marlin.
Change-Id: I8e846524546b6f3f0e32ed869e851f62261eef23
Merged-In: I8e846524546b6f3f0e32ed869e851f62261eef23

Android.mk

@@ -126,6 +126,7 @@ LOCAL_SRC_FILES := \
     device.cpp \
     fuse_sdcard_provider.cpp \
     recovery.cpp \
+    recovery_main.cpp \
     roots.cpp \
     rotate_logs.cpp \
 

common.h

@@ -37,9 +37,13 @@ extern std::string stage;
 // The reason argument provided in "--reason=".
 extern const char* reason;
 
-// fopen a file, mounting volumes and making parent dirs as necessary.
+// fopen(3)'s the given file, by mounting volumes and making parent dirs as necessary. Returns the
+// file pointer, or nullptr on error.
 FILE* fopen_path(const std::string& path, const char* mode);
 
+// In turn fflush(3)'s, fsync(3)'s and fclose(3)'s the given stream.
+void check_and_fclose(FILE* fp, const std::string& name);
+
 void ui_print(const char* format, ...) __printflike(1, 2);
 
 bool is_ro_debuggable();

private/recovery.h

@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+int start_recovery(int argc, char** argv);

recovery.cpp

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#include "private/recovery.h"
+
 #include <ctype.h>
 #include <dirent.h>
 #include <errno.h>
@@ -35,7 +37,6 @@
 #include <unistd.h>
 
 #include <algorithm>
-#include <chrono>
 #include <memory>
 #include <string>
 #include <vector>
@@ -51,8 +52,8 @@
 #include <cutils/android_reboot.h>
 #include <cutils/properties.h> /* for property_list */
 #include <healthd/BatteryMonitor.h>
-#include <private/android_logger.h> /* private pmsg functions */
 #include <private/android_filesystem_config.h>  /* for AID_SYSTEM */
+#include <private/android_logger.h>             /* private pmsg functions */
 #include <selinux/android.h>
 #include <selinux/label.h>
 #include <selinux/selinux.h>
@@ -64,7 +65,6 @@
 #include "fuse_sdcard_provider.h"
 #include "fuse_sideload.h"
 #include "install.h"
-#include "minadbd/minadbd.h"
 #include "minui/minui.h"
 #include "otautil/DirUtil.h"
 #include "otautil/error_code.h"
@@ -147,7 +147,6 @@ struct selabel_handle* sehandle;
  *    7b. the user reboots (pulling the battery, etc) into the main system
  */
 
-// Open a given path, mounting partitions as necessary.
 FILE* fopen_path(const std::string& path, const char* mode) {
   if (ensure_path_mounted(path.c_str()) != 0) {
     LOG(ERROR) << "Can't mount " << path;
@@ -162,8 +161,7 @@ FILE* fopen_path(const std::string& path, const char* mode) {
   return fopen(path.c_str(), mode);
 }
 
-// close a file, log an error if the error indicator is set
+void check_and_fclose(FILE* fp, const std::string& name) {
-static void check_and_fclose(FILE* fp, const std::string& name) {
   fflush(fp);
   if (fsync(fileno(fp)) == -1) {
     PLOG(ERROR) << "Failed to fsync " << name;
@@ -186,92 +184,6 @@ bool reboot(const std::string& command) {
     return android::base::SetProperty(ANDROID_RB_PROPERTY, cmd);
 }
 
-static void redirect_stdio(const char* filename) {
-    int pipefd[2];
-    if (pipe(pipefd) == -1) {
-        PLOG(ERROR) << "pipe failed";
-
-        // Fall back to traditional logging mode without timestamps.
-        // If these fail, there's not really anywhere to complain...
-        freopen(filename, "a", stdout); setbuf(stdout, NULL);
-        freopen(filename, "a", stderr); setbuf(stderr, NULL);
-
-        return;
-    }
-
-    pid_t pid = fork();
-    if (pid == -1) {
-        PLOG(ERROR) << "fork failed";
-
-        // Fall back to traditional logging mode without timestamps.
-        // If these fail, there's not really anywhere to complain...
-        freopen(filename, "a", stdout); setbuf(stdout, NULL);
-        freopen(filename, "a", stderr); setbuf(stderr, NULL);
-
-        return;
-    }
-
-    if (pid == 0) {
-        /// Close the unused write end.
-        close(pipefd[1]);
-
-        auto start = std::chrono::steady_clock::now();
-
-        // Child logger to actually write to the log file.
-        FILE* log_fp = fopen(filename, "ae");
-        if (log_fp == nullptr) {
-            PLOG(ERROR) << "fopen \"" << filename << "\" failed";
-            close(pipefd[0]);
-            _exit(EXIT_FAILURE);
-        }
-
-        FILE* pipe_fp = fdopen(pipefd[0], "r");
-        if (pipe_fp == nullptr) {
-            PLOG(ERROR) << "fdopen failed";
-            check_and_fclose(log_fp, filename);
-            close(pipefd[0]);
-            _exit(EXIT_FAILURE);
-        }
-
-        char* line = nullptr;
-        size_t len = 0;
-        while (getline(&line, &len, pipe_fp) != -1) {
-            auto now = std::chrono::steady_clock::now();
-            double duration = std::chrono::duration_cast<std::chrono::duration<double>>(
-                    now - start).count();
-            if (line[0] == '\n') {
-                fprintf(log_fp, "[%12.6lf]\n", duration);
-            } else {
-                fprintf(log_fp, "[%12.6lf] %s", duration, line);
-            }
-            fflush(log_fp);
-        }
-
-        PLOG(ERROR) << "getline failed";
-
-        free(line);
-        check_and_fclose(log_fp, filename);
-        close(pipefd[0]);
-        _exit(EXIT_FAILURE);
-    } else {
-        // Redirect stdout/stderr to the logger process.
-        // Close the unused read end.
-        close(pipefd[0]);
-
-        setbuf(stdout, nullptr);
-        setbuf(stderr, nullptr);
-
-        if (dup2(pipefd[1], STDOUT_FILENO) == -1) {
-            PLOG(ERROR) << "dup2 stdout failed";
-        }
-        if (dup2(pipefd[1], STDERR_FILENO) == -1) {
-            PLOG(ERROR) << "dup2 stderr failed";
-        }
-
-        close(pipefd[1]);
-    }
-}
-
 // command line args come from, in decreasing precedence:
 //   - the actual command line
 //   - the bootloader control block (one per line, after "recovery")
@@ -1218,18 +1130,6 @@ void ui_print(const char* format, ...) {
     }
 }
 
-static constexpr char log_characters[] = "VDIWEF";
-
-void UiLogger(android::base::LogId /* id */, android::base::LogSeverity severity,
-              const char* /* tag */, const char* /* file */, unsigned int /* line */,
-              const char* message) {
-  if (severity >= android::base::ERROR && ui != nullptr) {
-    ui->Print("E:%s\n", message);
-  } else {
-    fprintf(stdout, "%c:%s\n", log_characters[severity], message);
-  }
-}
-
 static bool is_battery_ok(int* required_battery_level) {
   struct healthd_config healthd_config = {
     .batteryStatusPath = android::String8(android::String8::kEmptyString),
@@ -1339,38 +1239,9 @@ static void log_failure_code(ErrorCode code, const std::string& update_package)
   LOG(INFO) << log_content;
 }
 
-int main(int argc, char **argv) {
+int start_recovery(int argc, char** argv) {
-  // We don't have logcat yet under recovery; so we'll print error on screen and
-  // log to stdout (which is redirected to recovery.log) as we used to do.
-  android::base::InitLogging(argv, &UiLogger);
-
-  // Take last pmsg contents and rewrite it to the current pmsg session.
-  static const char filter[] = "recovery/";
-  // Do we need to rotate?
-  bool doRotate = false;
-
-  __android_log_pmsg_file_read(LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter, logbasename, &doRotate);
-  // Take action to refresh pmsg contents
-  __android_log_pmsg_file_read(LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter, logrotate, &doRotate);
-
-  // If this binary is started with the single argument "--adbd",
-  // instead of being the normal recovery binary, it turns into kind
-  // of a stripped-down version of adbd that only supports the
-  // 'sideload' command.  Note this must be a real argument, not
-  // anything in the command file or bootloader control block; the
-  // only way recovery should be run with this argument is when it
-  // starts a copy of itself from the apply_from_adb() function.
-  if (argc == 2 && strcmp(argv[1], "--adbd") == 0) {
-    minadbd_main();
-    return 0;
-  }
-
   time_t start = time(nullptr);
 
-  // redirect_stdio should be called only in non-sideload mode. Otherwise
-  // we may have two logger instances with different timestamps.
-  redirect_stdio(Paths::Get().temporary_log_file().c_str());
-
   printf("Starting recovery (pid %d) on %s", getpid(), ctime(&start));
 
   load_volume_table();

recovery_main.cpp

@@ -0,0 +1,162 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <chrono>
+
+#include <android-base/logging.h>
+#include <private/android_logger.h> /* private pmsg functions */
+
+#include "common.h"
+#include "minadbd/minadbd.h"
+#include "otautil/paths.h"
+#include "private/recovery.h"
+#include "rotate_logs.h"
+#include "ui.h"
+
+static void UiLogger(android::base::LogId /* id */, android::base::LogSeverity severity,
+                     const char* /* tag */, const char* /* file */, unsigned int /* line */,
+                     const char* message) {
+  static constexpr char log_characters[] = "VDIWEF";
+  if (severity >= android::base::ERROR && ui != nullptr) {
+    ui->Print("E:%s\n", message);
+  } else {
+    fprintf(stdout, "%c:%s\n", log_characters[severity], message);
+  }
+}
+
+static void redirect_stdio(const char* filename) {
+  int pipefd[2];
+  if (pipe(pipefd) == -1) {
+    PLOG(ERROR) << "pipe failed";
+
+    // Fall back to traditional logging mode without timestamps. If these fail, there's not really
+    // anywhere to complain...
+    freopen(filename, "a", stdout);
+    setbuf(stdout, nullptr);
+    freopen(filename, "a", stderr);
+    setbuf(stderr, nullptr);
+
+    return;
+  }
+
+  pid_t pid = fork();
+  if (pid == -1) {
+    PLOG(ERROR) << "fork failed";
+
+    // Fall back to traditional logging mode without timestamps. If these fail, there's not really
+    // anywhere to complain...
+    freopen(filename, "a", stdout);
+    setbuf(stdout, nullptr);
+    freopen(filename, "a", stderr);
+    setbuf(stderr, nullptr);
+
+    return;
+  }
+
+  if (pid == 0) {
+    /// Close the unused write end.
+    close(pipefd[1]);
+
+    auto start = std::chrono::steady_clock::now();
+
+    // Child logger to actually write to the log file.
+    FILE* log_fp = fopen(filename, "ae");
+    if (log_fp == nullptr) {
+      PLOG(ERROR) << "fopen \"" << filename << "\" failed";
+      close(pipefd[0]);
+      _exit(EXIT_FAILURE);
+    }
+
+    FILE* pipe_fp = fdopen(pipefd[0], "r");
+    if (pipe_fp == nullptr) {
+      PLOG(ERROR) << "fdopen failed";
+      check_and_fclose(log_fp, filename);
+      close(pipefd[0]);
+      _exit(EXIT_FAILURE);
+    }
+
+    char* line = nullptr;
+    size_t len = 0;
+    while (getline(&line, &len, pipe_fp) != -1) {
+      auto now = std::chrono::steady_clock::now();
+      double duration =
+          std::chrono::duration_cast<std::chrono::duration<double>>(now - start).count();
+      if (line[0] == '\n') {
+        fprintf(log_fp, "[%12.6lf]\n", duration);
+      } else {
+        fprintf(log_fp, "[%12.6lf] %s", duration, line);
+      }
+      fflush(log_fp);
+    }
+
+    PLOG(ERROR) << "getline failed";
+
+    free(line);
+    check_and_fclose(log_fp, filename);
+    close(pipefd[0]);
+    _exit(EXIT_FAILURE);
+  } else {
+    // Redirect stdout/stderr to the logger process. Close the unused read end.
+    close(pipefd[0]);
+
+    setbuf(stdout, nullptr);
+    setbuf(stderr, nullptr);
+
+    if (dup2(pipefd[1], STDOUT_FILENO) == -1) {
+      PLOG(ERROR) << "dup2 stdout failed";
+    }
+    if (dup2(pipefd[1], STDERR_FILENO) == -1) {
+      PLOG(ERROR) << "dup2 stderr failed";
+    }
+
+    close(pipefd[1]);
+  }
+}
+
+int main(int argc, char** argv) {
+  // We don't have logcat yet under recovery; so we'll print error on screen and log to stdout
+  // (which is redirected to recovery.log) as we used to do.
+  android::base::InitLogging(argv, &UiLogger);
+
+  // Take last pmsg contents and rewrite it to the current pmsg session.
+  static constexpr const char filter[] = "recovery/";
+  // Do we need to rotate?
+  bool do_rotate = false;
+
+  __android_log_pmsg_file_read(LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter, logbasename, &do_rotate);
+  // Take action to refresh pmsg contents
+  __android_log_pmsg_file_read(LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter, logrotate, &do_rotate);
+
+  // If this binary is started with the single argument "--adbd", instead of being the normal
+  // recovery binary, it turns into kind of a stripped-down version of adbd that only supports the
+  // 'sideload' command.  Note this must be a real argument, not anything in the command file or
+  // bootloader control block; the only way recovery should be run with this argument is when it
+  // starts a copy of itself from the apply_from_adb() function.
+  if (argc == 2 && strcmp(argv[1], "--adbd") == 0) {
+    minadbd_main();
+    return 0;
+  }
+
+  // redirect_stdio should be called only in non-sideload mode. Otherwise we may have two logger
+  // instances with different timestamps.
+  redirect_stdio(Paths::Get().temporary_log_file().c_str());
+
+  return start_recovery(argc, argv);
+}