Merge "fs_mgr: Look for fstab file in /system/etc" into sc-qpr1-dev am: 13126885

    return fstab_result;

}

// Identify path to fstab file. Lookup is based on pattern

// fstab.<fstab_suffix>, fstab.<hardware>, fstab.<hardware.platform> in

// folders /odm/etc, vendor/etc, or /.

// Return the path to the fstab file.  There may be multiple fstab files; the

// one that is returned will be the first that exists of fstab.<fstab_suffix>,

// fstab.<hardware>, and fstab.<hardware.platform>.  The fstab is searched for

// in /odm/etc/ and /vendor/etc/, as well as in the locations where it may be in

// the first stage ramdisk during early boot.  Previously, the first stage

// ramdisk's copy of the fstab had to be located in the root directory, but now

// the system/etc directory is supported too and is the preferred location.

std::string GetFstabPath() {

    for (const char* prop : {"fstab_suffix", "hardware", "hardware.platform"}) {

        std::string suffix;

        if (!fs_mgr_get_boot_config(prop, &suffix)) continue;

        for (const char* prefix :

             {"/odm/etc/fstab.", "/vendor/etc/fstab.", "/fstab.", "/first_stage_ramdisk/fstab."}) {

        for (const char* prefix : {// late-boot/post-boot locations

                                   "/odm/etc/fstab.", "/vendor/etc/fstab.",

                                   // early boot locations

                                   "/system/etc/fstab.", "/first_stage_ramdisk/system/etc/fstab.",

                                   "/fstab.", "/first_stage_ramdisk/fstab."}) {

            std::string fstab_path = prefix + suffix;

            if (access(fstab_path.c_str(), F_OK) == 0) {

                return fstab_path;