Switch to bionic gtest in bootable/recovery

We encountered segfaults in Imgdiff host tests due to the failure to
reset states of getopt. The problem can be solved by switching to use
bionic's gtest where a new process is forked for each test.

Also modify the recovery_component_test to make sure it runs in parallel.
Changes include:
  1. Merge the writes to misc partition into one single test.
  2. Change the hard coded location "/cache/saved.file" into a configurable
  variable.

Bug: 67849209
Test: recovery tests pass

Change-Id: I165d313f32b83393fb7922c5078636ac40b50bc2

applypatch/applypatch.cpp

@@ -42,6 +42,8 @@
 #include "otafault/ota_io.h"
 #include "otautil/print_sha1.h"
 
+std::string cache_temp_source = "/cache/saved.file";
+
 static int LoadPartitionContents(const std::string& filename, FileContents* file);
 static size_t FileSink(const unsigned char* data, size_t len, int fd);
 static int GenerateTarget(const FileContents& source_file, const std::unique_ptr<Value>& patch,
@@ -411,12 +413,10 @@ int applypatch_check(const char* filename, const std::vector<std::string>& patch
       (!patch_sha1_str.empty() && FindMatchingPatch(file.sha1, patch_sha1_str) < 0)) {
     printf("file \"%s\" doesn't have any of expected sha1 sums; checking cache\n", filename);
 
-    // If the source file is missing or corrupted, it might be because
-    // we were killed in the middle of patching it.  A copy of it
-    // should have been made in CACHE_TEMP_SOURCE.  If that file
-    // exists and matches the sha1 we're looking for, the check still
-    // passes.
-    if (LoadFileContents(CACHE_TEMP_SOURCE, &file) != 0) {
+    // If the source file is missing or corrupted, it might be because we were killed in the middle
+    // of patching it.  A copy of it should have been made in cache_temp_source.  If that file
+    // exists and matches the sha1 we're looking for, the check still passes.
+    if (LoadFileContents(cache_temp_source.c_str(), &file) != 0) {
       printf("failed to load cache file\n");
       return 1;
     }
@@ -539,7 +539,7 @@ int applypatch(const char* source_filename, const char* target_filename,
   printf("source file is bad; trying copy\n");
 
   FileContents copy_file;
-  if (LoadFileContents(CACHE_TEMP_SOURCE, &copy_file) < 0) {
+  if (LoadFileContents(cache_temp_source.c_str(), &copy_file) < 0) {
     printf("failed to read copy file\n");
     return 1;
   }
@@ -634,7 +634,7 @@ static int GenerateTarget(const FileContents& source_file, const std::unique_ptr
     printf("not enough free space on /cache\n");
     return 1;
   }
-  if (SaveFileContents(CACHE_TEMP_SOURCE, &source_file) < 0) {
+  if (SaveFileContents(cache_temp_source.c_str(), &source_file) < 0) {
     printf("failed to back up source file\n");
     return 1;
   }
@@ -680,7 +680,7 @@ static int GenerateTarget(const FileContents& source_file, const std::unique_ptr
   }
 
   // Delete the backup copy of the source.
-  unlink(CACHE_TEMP_SOURCE);
+  unlink(cache_temp_source.c_str());
 
   // Success!
   return 0;

applypatch/freecache.cpp

@@ -90,10 +90,9 @@ static std::set<std::string> FindExpendableFiles() {
     while ((de = readdir(d.get())) != 0) {
       std::string path = std::string(dirs[i]) + "/" + de->d_name;
 
-      // We can't delete CACHE_TEMP_SOURCE; if it's there we might have
-      // restarted during installation and could be depending on it to
-      // be there.
-      if (path == CACHE_TEMP_SOURCE) {
+      // We can't delete cache_temp_source; if it's there we might have restarted during
+      // installation and could be depending on it to be there.
+      if (path == cache_temp_source) {
         continue;
       }
 

applypatch/include/applypatch/applypatch.h

@@ -36,12 +36,11 @@ struct FileContents {
   struct stat st;
 };
 
-// When there isn't enough room on the target filesystem to hold the
-// patched version of the file, we copy the original here and delete
-// it to free up space.  If the expected source file doesn't exist, or
-// is corrupted, we look to see if this file contains the bits we want
-// and use it as the source instead.
-#define CACHE_TEMP_SOURCE "/cache/saved.file"
+// When there isn't enough room on the target filesystem to hold the patched version of the file,
+// we copy the original here and delete it to free up space.  If the expected source file doesn't
+// exist, or is corrupted, we look to see if the cached file contains the bits we want and use it as
+// the source instead.  The default location for the cached source is "/cache/saved.file".
+extern std::string cache_temp_source;
 
 using SinkFn = std::function<size_t(const unsigned char*, size_t)>;