twrpinstall: create library for twrpinstall
This library will need to mirror AOSP for any changes to installing
packages. The library has been separated out in order to make importing
updates from AOSP into the TWRP project.
twinstall.cpp has been removed from the recovery binary and added to
this library. It has been refactored for libziparchive.
Sideload has been reworked to use the newer methods from AOSP on
flashing packages through adb sideload.
We are also removing old libraries for adb and verifier.
Lastly before flashing a zip or image, we want to unlock block devices
for writing so that when an OTA is flashed to the inactive slot,
the flash will succeed.
Change-Id: I6d8702fc9031ffaf9f666b4ba375dc7d9362e473
diff --git a/twrpinstall/set_metadata.cpp b/twrpinstall/set_metadata.cpp
new file mode 100644
index 0000000..2e1d769
--- /dev/null
+++ b/twrpinstall/set_metadata.cpp
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2014 The Team Win Recovery 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.
+ */
+
+/*
+ * The purpose of these functions is to try to get and set the proper
+ * file permissions, SELinux contexts, owner, and group so that these
+ * files are accessible when we boot up to normal Android via MTP and to
+ * file manager apps. During early boot we try to read the contexts and
+ * owner / group info from /data/media or from /data/media/0 and store
+ * them in static variables. From there, we'll try to set the same
+ * contexts, owner, and group information on most files we create during
+ * operations like backups, copying the log, and MTP operations.
+ */
+
+#include <sys/stat.h>
+#include <stdio.h>
+#include <unistd.h>
+#include "selinux/selinux.h"
+
+static security_context_t selinux_context;
+struct stat s;
+static int has_stat = 0;
+
+int tw_get_context(const char* filename) {
+ if (lgetfilecon(filename, &selinux_context) >= 0) {
+ printf("tw_get_context got selinux context: %s\n", selinux_context);
+ return 0;
+ } else {
+ printf("tw_get_context failed to get selinux context\n");
+ selinux_context = NULL;
+ }
+ return -1;
+}
+
+int tw_get_stat(const char* filename) {
+ if (lstat(filename, &s) == 0) {
+ has_stat = 1;
+ return 0;
+ }
+ printf("tw_get_stat failed to lstat '%s'\n", filename);
+ return -1;
+}
+
+int tw_get_default_metadata(const char* filename) {
+ if (tw_get_context(filename) == 0 && tw_get_stat(filename) == 0)
+ return 0;
+ return -1;
+}
+
+// Most of this logging is disabled to prevent log spam if we are trying
+// to set contexts and permissions on file systems that do not support
+// these types of things (e.g. vfat / FAT / FAT32).
+int tw_set_default_metadata(const char* filename) {
+ int ret = 0;
+ struct stat st;
+
+ if (selinux_context == NULL) {
+ //printf("selinux_context was null, '%s'\n", filename);
+ ret = -1;
+ } else if (lsetfilecon(filename, selinux_context) < 0) {
+ //printf("Failed to set default contexts on '%s'.\n", filename);
+ ret = -1;
+ }
+
+ if (lstat(filename, &st) == 0 && st.st_mode & S_IFREG && chmod(filename, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH) < 0) {
+ //printf("Failed to chmod '%s'\n", filename);
+ ret = -1;
+ }
+
+ if (has_stat && chown(filename, s.st_uid, s.st_gid) < 0) {
+ //printf("Failed to lchown '%s'.\n", filename);
+ ret = -1;
+ }
+ //printf("Done trying to set defaults on '%s'\n");
+ return ret;
+}