Add 'adb backup' for pulling a full backup tarfile to the host
The direct command interfaces with the 'bu' binary in /system/bin
on the device.
Change-Id: I4cd69eedfe5144c47277573c5626c6ad8755d70b
diff --git a/adb/backup_service.c b/adb/backup_service.c
new file mode 100644
index 0000000..f5dc0b2
--- /dev/null
+++ b/adb/backup_service.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2011 The Android Open Source 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.
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+
+#include "sysdeps.h"
+
+#define TRACE_TAG TRACE_ADB
+#include "adb.h"
+
+/* returns the data socket passing the backup data here for forwarding */
+int backup_service(char* args) {
+ pid_t pid;
+ int s[2];
+
+ D("backup_service(%s)\n", args);
+
+ // set up the pipe from the subprocess to here
+ // parent will read s[0]; child will write s[1]
+ if (adb_socketpair(s)) {
+ D("can't create backup socketpair\n");
+ fprintf(stderr, "unable to create backup socketpair\n");
+ return -1;
+ }
+
+ // spin off the child process to run the backup command
+ pid = fork();
+ if (pid < 0) {
+ // failure
+ D("can't fork for backup\n");
+ fprintf(stderr, "unable to fork for backup\n");
+ adb_close(s[0]);
+ adb_close(s[1]);
+ return -1;
+ }
+
+ // Great, we're off and running.
+ if (pid == 0) {
+ char* p;
+ int argc;
+ char** backup_args;
+
+ // child -- actually run the backup here
+ argc = 1; // room for the basic 'bu' argv[0]
+ for (p = (char*)args; p && *p; ) {
+ argc++;
+ while (*p && *p != ':') p++;
+ if (*p == ':') p++;
+ }
+
+ backup_args = (char**) alloca(argc*sizeof(char*) + 1);
+ backup_args[0] = "bu";
+ argc = 1; // run through again to build the argv array
+ for (p = (char*)args; *p; ) {
+ backup_args[argc++] = p;
+ while (*p && *p != ':') p++;
+ if (*p == ':') {
+ *p = 0;
+ p++;
+ }
+ }
+ backup_args[argc] = NULL;
+
+ // Close the half of the socket that we don't care about, route 'bu's console
+ // to the output socket, and off we go
+ adb_close(s[0]);
+ dup2(s[1], STDOUT_FILENO);
+
+ // off we go
+ execvp("/system/bin/bu", (char * const *)backup_args);
+ // oops error - close up shop and go home
+ fprintf(stderr, "Unable to exec 'bu', bailing\n");
+ exit(-1);
+ } else {
+ // parent, i.e. adbd -- close the sending half of the socket
+ adb_close(s[1]);
+ }
+
+ // we'll be reading from s[0] as the data is sent by the child process
+ return s[0];
+}