Initial Contribution

1 files changed, 103 insertions, 0 deletions

diff --git a/adb/remount_service.c b/adb/remount_service.c
new file mode 100644
index 0000000..26bc841
--- /dev/null
+++ b/adb/remount_service.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2008 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 <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/mount.h>
+#include <errno.h>
+
+#include "sysdeps.h"
+
+#define  TRACE_TAG  TRACE_ADB
+#include "adb.h"
+
+
+static int system_ro = 1;
+
+/* Returns the mount number of the requested partition from /proc/mtd */
+static int find_mount(const char *findme)
+{
+    int fd;
+    int res;
+    int size;
+    char *token = NULL;
+    const char delims[] = "\n";
+    char buf[1024];
+
+    fd = unix_open("/proc/mtd", O_RDONLY);
+    if (fd < 0)
+        return -errno;
+
+    buf[sizeof(buf) - 1] = '\0';
+    size = adb_read(fd, buf, sizeof(buf) - 1);
+    adb_close(fd);
+
+    token = strtok(buf, delims);
+
+    while (token) {
+        char mtdname[16];
+        int mtdnum, mtdsize, mtderasesize;
+
+        res = sscanf(token, "mtd%d: %x %x %15s",
+                     &mtdnum, &mtdsize, &mtderasesize, mtdname);
+
+        if (res == 4 && !strcmp(mtdname, findme))
+            return mtdnum;
+
+        token = strtok(NULL, delims);
+    }
+    return -1;
+}
+
+/* Init mounts /system as read only, remount to enable writes. */
+static int remount_system()
+{
+    int num;
+    char source[64];
+    if (system_ro == 0) {
+        return 0;
+    }
+    if ((num = find_mount("\"system\"")) < 0)
+        return -1;
+
+    snprintf(source, sizeof source, "/dev/block/mtdblock%d", num);
+    system_ro = mount(source, "/system", "yaffs2", MS_REMOUNT, NULL);
+    return system_ro;
+}
+
+static void write_string(int fd, const char* str)
+{
+    writex(fd, str, strlen(str));
+}
+
+void remount_service(int fd, void *cookie)
+{
+    int ret = remount_system();
+
+    if (!ret)
+       write_string(fd, "remount succeeded\n");
+    else {
+        char    buffer[200];
+        snprintf(buffer, sizeof(buffer), "remount failed: %s\n", strerror(errno));
+        write_string(fd, buffer);
+    }
+
+    adb_close(fd);
+}
+