mr_hooks.c

/*
 * This file contains device specific hooks.
 * Always enclose hooks to #if MR_DEVICE_HOOKS >= ver
 * with corresponding hook version!
 */

#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>

#if MR_DEVICE_HOOKS >= 1

int mrom_hook_after_android_mounts(const char *busybox_path, const char *base_path, int type)
{
    // On M7, this fstab file is used to remount system to RO,
    // but with MultiROM, it remounts everything as RO, even /data and /cache
    if(access("/remount.qcom", F_OK) >= 0)
        return remove("/remount.qcom");

    // Sense ROMs still use init.rc to mount partitions
    if(access("/init.target.rc", F_OK) >= 0)
    {
        char line[1024];
        int add_dummy = 0;

        FILE *f_in = fopen("/init.target.rc", "r");
        if(!f_in)
            return -1;

        FILE *f_out = fopen("/init.target.rc.new", "w");
        if(!f_out)
        {
            fclose(f_in);
            return -1;
        }

        while((fgets(line, sizeof(line), f_in)))
        {
            if (strstr(line, "on "))
                add_dummy = 1;
            else if (strstr(line, "mount ") && !strstr(line, "tmpfs") &&
                (strstr(line, "/data") || strstr(line, "/system") || strstr(line, "/cache")))
            {
                if(add_dummy == 1)
                {
                    add_dummy = 0;
                    fputs("    export DUMMY_LINE_INGORE_IT 1\n", f_out);
                }
                fputc((int)'#', f_out);
            }
            fputs(line, f_out);
        }

        fclose(f_in);
        fclose(f_out);

        rename("/init.target.rc.new", "/init.target.rc");
        chmod("/init.target.rc", 0755);
    }
    return 0;
}

#endif /* MR_DEVICE_HOOKS >= 1 */