Implement system data migration support.

This adds three new features:

- <original-package android:name="com.foo" /> manifest tag.
  This allows an .apk to specify another package it originally came from,
  propagating all state and data from the old to new package.

- <adopt-permissions android:name="com.foo" /> manifest tag.
  In some more complicated cases, a new .apk may be a combination
  of multiple older .apks that each declared their own permissions.
  This allows you to propagate the permissions from these other
  .apks into the new one.

- A new system/etc/updatecmds directory.
  You can place files here which describe data files to move from
  one package to another.  (See below for details.)

Also in this change: we now clean up the data directories of
.apks that disappear from the system image, and some improvements
to logging and reporting error messages.

A typical file in the updatecmds directory looks like this:

-------
com.google.android.gsf:com.google.android.providers.talk
    databases/talk.db
com.google.android.gsf:com.google.android.googleapps
    databases/gls.db
-------

This says that for com.google.android.sfs, there are two packages to
move files from:

From com.google.android.providers.talk, the file databases/talk.db.
From com.google.android.googleapps, the file databases/gls.db

As part of moving the file, its owner will be changed from the old
package to whoever is the owner of the new package's data directory.

If those two files had existed, after booting you would now have the
files:

/data/data/com.google.android.gsf/databases/talk.db
/data/data/com.google.android.gsf/databases/gls.db

Note that all three of these facilities assume that the older .apk
is completely removed from the newer system.  The WILL NOT work
correctly if the older .apk still remains.

1 files changed, 3 insertions, 0 deletions

diff --git a/cmds/installd/installd.h b/cmds/installd/installd.h
index 35a173e..92ae310 100644
--- a/cmds/installd/installd.h
+++ b/cmds/installd/installd.h
@@ -73,6 +73,7 @@
 #define DALVIK_CACHE_PREFIX   "/data/dalvik-cache/"
 #define DALVIK_CACHE_POSTFIX  "/classes.dex"
 
+#define UPDATE_COMMANDS_DIR_PREFIX  "/system/etc/updatecmds/"
 
 #define PKG_NAME_MAX  128   /* largest allowed package name */
 #define PKG_PATH_MAX  256   /* max size of any path we use */
@@ -97,6 +98,7 @@ int delete_dir_contents_fd(int dfd, const char *name);
 
 int install(const char *pkgname, int encrypted_fs_flag, uid_t uid, gid_t gid);
 int uninstall(const char *pkgname, int encrypted_fs_flag);
+int renamepkg(const char *oldpkgname, const char *newpkgname, int encrypted_fs_flag);
 int delete_user_data(const char *pkgname, int encrypted_fs_flag);
 int delete_cache(const char *pkgname, int encrypted_fs_flag);
 int move_dex(const char *src, const char *dst);
@@ -106,3 +108,4 @@ int get_size(const char *pkgname, const char *apkpath, const char *fwdlock_apkpa
              int *codesize, int *datasize, int *cachesize, int encrypted_fs_flag);
 int free_cache(int free_size);
 int dexopt(const char *apk_path, uid_t uid, int is_public);
+int movefiles();