Themes: Restructure resource cache [2/2]

Change-Id: Ib62081e0551e572680b92c0a587bdc7bbee9b62b

cmds/installd/commands.cpp

@@ -1601,8 +1601,8 @@ out:
     return rc;
 }
 
-static void run_idmap(const char *target_apk, const char *overlay_apk, int idmap_fd,
-                      uint32_t target_hash, uint32_t overlay_hash)
+static void run_idmap(const char *target_apk, const char *overlay_apk, const char *cache_path,
+                      int idmap_fd, uint32_t target_hash, uint32_t overlay_hash)
 {
     static const char *IDMAP_BIN = "/system/bin/idmap";
     static const size_t MAX_INT_LEN = 32;
@@ -1614,65 +1614,33 @@ static void run_idmap(const char *target_apk, const char *overlay_apk, int idmap
     snprintf(target_hash_str, sizeof(target_hash_str), "%d", target_hash);
     snprintf(overlay_hash_str, sizeof(overlay_hash_str), "%d", overlay_hash);
 
-    execl(IDMAP_BIN, IDMAP_BIN, "--fd", target_apk, overlay_apk, idmap_str,
+    execl(IDMAP_BIN, IDMAP_BIN, "--fd", target_apk, overlay_apk, cache_path, idmap_str,
             target_hash_str, overlay_hash_str, (char*)NULL);
     ALOGE("execl(%s) failed: %s\n", IDMAP_BIN, strerror(errno));
 }
 
-/* Prints to idmap_path (prefix)/(flat_target)@(flat_overerlay)@(suffix)
- * Note: "Flat" is a string with '/' changed to @
- * Example input:
- *   prefix: /data/resource-cache/
- *   suffix: idmap
- *   overlay_path: /data/app/com.theme.apk
- *   target_path:  /data/app/com.target.apk
- * Example output:
- *   idmap_path: /data/resource-cache/data@app@com.target.apk@data@app@theme.apk@idmap
- */
-static int flatten_path(const char *prefix, const char *suffix,
-        const char *overlay_path, const char *target_path, char *idmap_path, size_t N)
+static int get_idmap_path(const char *prefix, const char *suffix, char *idmap_path, size_t N)
 {
-    if (overlay_path == NULL || idmap_path == NULL || target_path == NULL) {
-        return -1;
-    }
-
-    const size_t len_target_path = strlen(target_path);
-    if (len_target_path < 2 || *target_path != '/') {
-       return -1;
-    }
-
-    const size_t len_overlay_path = strlen(overlay_path);
-    // will access overlay_path + 1 further below; requires absolute path
-    if (len_overlay_path < 2 || *overlay_path != '/') {
-        return -1;
-    }
-    const size_t len_idmap_root = strlen(prefix);
+    if (idmap_path == NULL) return -1;
 
     memset(idmap_path, 0, N);
-    int len = snprintf(idmap_path, N, "%s%s%s%s", prefix, target_path + 1, overlay_path, suffix);
+    int len = snprintf(idmap_path, N, "%s/%s", prefix, suffix);
     if (len < 0 || (size_t)len >= N) {
         return -1; // error or truncated
     }
-    char *ch = idmap_path + len_idmap_root;
-    while (*ch != '\0') {
-        if (*ch == '/') {
-            *ch = '@';
-        }
-        ++ch;
-    }
     return 0;
 }
 
-int idmap(const char *target_apk, const char *overlay_apk, uid_t uid,
-          uint32_t target_hash, uint32_t overlay_hash)
+int idmap(const char *target_apk, const char *overlay_apk, const char *cache_path,
+          uid_t uid, uint32_t target_hash, uint32_t overlay_hash)
 {
-    ALOGV("idmap target_apk=%s overlay_apk=%s uid=%d\n", target_apk, overlay_apk, uid);
+    ALOGD("idmap target_apk=%s overlay_apk=%s cache_path=%s uid=%d\n", target_apk, overlay_apk,
+            cache_path, uid);
 
     int idmap_fd = -1;
     char idmap_path[PATH_MAX];
 
-    if (flatten_path(IDMAP_PREFIX, IDMAP_SUFFIX, overlay_apk, target_apk,
-                idmap_path, sizeof(idmap_path)) == -1) {
+    if (get_idmap_path(cache_path, IDMAP_SUFFIX, idmap_path, sizeof(idmap_path)) == -1) {
         ALOGE("idmap cannot generate idmap path for overlay %s\n", overlay_apk);
         goto fail;
     }
@@ -1709,7 +1677,7 @@ int idmap(const char *target_apk, const char *overlay_apk, uid_t uid,
             exit(1);
         }
 
-        run_idmap(target_apk, overlay_apk, idmap_fd, target_hash, overlay_hash);
+        run_idmap(target_apk, overlay_apk, cache_path, idmap_fd, target_hash, overlay_hash);
         exit(1); /* only if exec call to idmap failed */
     } else {
         int status = wait_child(pid);

cmds/installd/installd.cpp

@@ -158,7 +158,7 @@ static int do_linklib(char **arg, char reply[REPLY_MAX] __unused)
 
 static int do_idmap(char **arg, char reply[REPLY_MAX] __unused)
 {
-    return idmap(arg[0], arg[1], atoi(arg[2]), atoi(arg[3]), atoi(arg[4]));
+    return idmap(arg[0], arg[1], arg[2], atoi(arg[3]), atoi(arg[4]), atoi(arg[5]));
 }
 
 static int do_aapt(char **arg, char reply[REPLY_MAX] __unused)
@@ -222,7 +222,7 @@ struct cmdinfo cmds[] = {
     { "mkuserdata",           5, do_mk_user_data },
     { "mkuserconfig",         1, do_mk_user_config },
     { "rmuser",               2, do_rm_user },
-    { "idmap",                5, do_idmap },
+    { "idmap",                6, do_idmap },
     { "aapt",                 6, do_aapt },
     { "aapt_with_common",     7, do_aapt_with_common },
     { "restorecondata",       4, do_restorecon_data },

cmds/installd/installd.h

@@ -80,7 +80,7 @@
 #define UPDATE_COMMANDS_DIR_PREFIX  "/system/etc/updatecmds/"
 
 #define IDMAP_PREFIX           "/data/resource-cache/"
-#define IDMAP_SUFFIX           "@idmap"
+#define IDMAP_SUFFIX           "idmap"
 
 #define PKG_NAME_MAX  128   /* largest allowed package name */
 #define PKG_PATH_MAX  256   /* max size of any path we use */
@@ -247,7 +247,7 @@ int dexopt(const char *apk_path, uid_t uid, bool is_public, const char *pkgName,
 int mark_boot_complete(const char *instruction_set);
 int movefiles();
 int linklib(const char* uuid, const char* pkgname, const char* asecLibDir, int userId);
-int idmap(const char *target_path, const char *overlay_path, uid_t uid,
+int idmap(const char *target_path, const char *overlay_path, const char *cache_path, uid_t uid,
           uint32_t target_hash, uint32_t overlay_hash);
 int aapt(const char *source_apk, const char *internal_path, const char *out_restable, uid_t uid,
          int pkgId, int min_sdk_version, const char *common_res_path);