Fix free_cache to actually work

This broke with some other path-related changes, so it was scanning for
/data/*/cache instead of /data/data/*/cache

Also remove redundant call to restat

Bug: 5686310
Change-Id: Id1661f0f1337858fc9ead53c56ab7557f421c591

cmds/installd/commands.c

@@ -184,6 +184,7 @@ int free_cache(int64_t free_size)
     DIR *d;
     struct dirent *de;
     int64_t avail;
+    char datadir[PKG_PATH_MAX];
 
     avail = disk_free();
     if (avail < 0) return -1;
@@ -191,9 +192,14 @@ int free_cache(int64_t free_size)
     LOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
     if (avail >= free_size) return 0;
 
-    d = opendir(android_data_dir.path);
+    if (create_persona_path(datadir, 0)) {
+        LOGE("couldn't get directory for persona 0");
+        return -1;
+    }
+
+    d = opendir(datadir);
     if (d == NULL) {
-        LOGE("cannot open %s: %s\n", android_data_dir.path, strerror(errno));
+        LOGE("cannot open %s: %s\n", datadir, strerror(errno));
         return -1;
     }
     dfd = dirfd(d);
@@ -578,19 +584,6 @@ fail:
     return -1;
 }
 
-int create_move_path(char path[PKG_PATH_MAX],
-    const char* pkgname,
-    const char* leaf,
-    uid_t persona)
-{
-    if ((android_data_dir.len + strlen(pkgname) + strlen(leaf) + 1) >= PKG_PATH_MAX) {
-        return -1;
-    }
-    
-    sprintf(path, "%s%s%s/%s", android_data_dir.path, PRIMARY_USER_PREFIX, pkgname, leaf);
-    return 0;
-}
-
 void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid,
         struct stat* statbuf)
 {

cmds/installd/installd.h

@@ -105,6 +105,11 @@ int create_pkg_path(char path[PKG_PATH_MAX],
 int create_persona_path(char path[PKG_PATH_MAX],
                     uid_t persona);
 
+int create_move_path(char path[PKG_PATH_MAX],
+                     const char* pkgname,
+                     const char* leaf,
+                     uid_t persona);
+
 int is_valid_package_name(const char* pkgname);
 
 int create_cache_path(char path[PKG_PATH_MAX], const char *src);

cmds/installd/tests/installd_utils_test.cpp

@@ -34,6 +34,16 @@ extern "C" {
 #define TEST_SYSTEM_DIR1 "/system/app/"
 #define TEST_SYSTEM_DIR2 "/vendor/app/"
 
+#define REALLY_LONG_APP_NAME "com.example." \
+        "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa." \
+        "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa." \
+        "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+
+#define REALLY_LONG_LEAF_NAME "shared_prefs_shared_prefs_shared_prefs_shared_prefs_shared_prefs_" \
+        "shared_prefs_shared_prefs_shared_prefs_shared_prefs_shared_prefs_shared_prefs_" \
+        "shared_prefs_shared_prefs_shared_prefs_shared_prefs_shared_prefs_shared_prefs_" \
+        "shared_prefs_shared_prefs_shared_prefs_shared_prefs_shared_prefs_shared_prefs_"
+
 namespace android {
 
 class UtilsTest : public testing::Test {
@@ -210,7 +220,7 @@ TEST_F(UtilsTest, CheckSystemApp_BadPathEscapeFail) {
 
 TEST_F(UtilsTest, GetPathFromString_NullPathFail) {
     dir_rec_t test1;
-    EXPECT_EQ(-1, get_path_from_string(&test1, NULL))
+    EXPECT_EQ(-1, get_path_from_string(&test1, (const char *) NULL))
             << "Should not allow NULL as a path.";
 }
 
@@ -327,6 +337,50 @@ TEST_F(UtilsTest, CreatePkgPathInDir_ProtectedDir) {
             << "Package path should be in /data/app-private/";
 }
 
+TEST_F(UtilsTest, CreatePersonaPath_Primary) {
+    char path[PKG_PATH_MAX];
+
+    EXPECT_EQ(0, create_persona_path(path, 0))
+            << "Should successfully build primary user path.";
+
+    EXPECT_STREQ("/data/data/", path)
+            << "Primary user should have correct path";
+}
+
+TEST_F(UtilsTest, CreatePersonaPath_Secondary) {
+    char path[PKG_PATH_MAX];
+
+    EXPECT_EQ(0, create_persona_path(path, 1))
+            << "Should successfully build primary user path.";
+
+    EXPECT_STREQ("/data/user/1/", path)
+            << "Primary user should have correct path";
+}
+
+TEST_F(UtilsTest, CreateMovePath_Primary) {
+    char path[PKG_PATH_MAX];
+
+    EXPECT_EQ(0, create_move_path(path, "com.android.test", "shared_prefs", 0))
+            << "Should be able to create move path for primary user";
+
+    EXPECT_STREQ("/data/data/com.android.test/shared_prefs", path)
+            << "Primary user package directory should be created correctly";
+}
+
+TEST_F(UtilsTest, CreateMovePath_Fail_AppTooLong) {
+    char path[PKG_PATH_MAX];
+
+    EXPECT_EQ(-1, create_move_path(path, REALLY_LONG_APP_NAME, "shared_prefs", 0))
+            << "Should fail to create move path for primary user";
+}
+
+TEST_F(UtilsTest, CreateMovePath_Fail_LeafTooLong) {
+    char path[PKG_PATH_MAX];
+
+    EXPECT_EQ(-1, create_move_path(path, "com.android.test", REALLY_LONG_LEAF_NAME, 0))
+            << "Should fail to create move path for primary user";
+}
+
 TEST_F(UtilsTest, CopyAndAppend_Normal) {
     //int copy_and_append(dir_rec_t* dst, dir_rec_t* src, char* suffix)
     dir_rec_t dst;

cmds/installd/utils.c

@@ -109,7 +109,7 @@ int create_persona_path(char path[PKG_PATH_MAX],
         uid_len = 0;
     } else {
         persona_prefix = SECONDARY_USER_PREFIX;
-        uid_len = snprintf(NULL, 0, "%d", persona);
+        uid_len = snprintf(NULL, 0, "%d/", persona);
     }
 
     char *dst = path;
@@ -126,7 +126,7 @@ int create_persona_path(char path[PKG_PATH_MAX],
             LOGE("Error building user path");
             return -1;
         }
-        int ret = snprintf(dst, dst_size, "%d", persona);
+        int ret = snprintf(dst, dst_size, "%d/", persona);
         if (ret < 0 || (size_t) ret != uid_len) {
             LOGE("Error appending persona id to path");
             return -1;
@@ -135,6 +135,20 @@ int create_persona_path(char path[PKG_PATH_MAX],
     return 0;
 }
 
+int create_move_path(char path[PKG_PATH_MAX],
+    const char* pkgname,
+    const char* leaf,
+    uid_t persona)
+{
+    if ((android_data_dir.len + strlen(PRIMARY_USER_PREFIX) + strlen(pkgname) + strlen(leaf) + 1)
+            >= PKG_PATH_MAX) {
+        return -1;
+    }
+
+    sprintf(path, "%s%s%s/%s", android_data_dir.path, PRIMARY_USER_PREFIX, pkgname, leaf);
+    return 0;
+}
+
 /**
  * Checks whether the package name is valid. Returns -1 on error and
  * 0 on success.

services/java/com/android/server/DeviceStorageMonitorService.java

@@ -163,7 +163,6 @@ public class DeviceStorageMonitorService extends Binder {
             } catch (IllegalArgumentException e) {
                 // ignore; report -1
             }
-            mCacheFileStats.restat(CACHE_PATH);
             EventLog.writeEvent(EventLogTags.FREE_STORAGE_LEFT,
                                 mFreeMem, mFreeSystem, mFreeCache);
         }