zciendor a0d6f21ac7 various minor fixes (#1993) ...

* fix permisson denied error happening in line 79

`mktemp` creates files with `-rw-------` (on Ubuntu bionic at least), which causes `line 79` to throw a permission denied error if the file isn't world readable.

* fixes umount error caused by single quotes

* force metadata duplication for btrfs root

Without this change metadata duplication is automatically turned off for `mkfs.btrfs` when the **build system** has a SSD drive.
However, since Armbian image is most likely flashed to a SD card afterwards, the drive type of the build host system should not be the deciding factor.
Metadata duplication is a good idea (better reliability) to have on a SD card.

From `man mkfs.btrfs`:
```
-m|--metadata <profile>
           Specify the profile for the metadata block groups. Valid values are raid0, raid1, raid5, raid6, raid10, single or dup, (case does not matter).

           A single device filesystem will default to DUP, unless a SSD is detected. Then it will default to single.
```

2020-05-28 10:52:54 +02:00

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