## Manual experiment

> [!NOTE]
> This manual experiment shows how we can do the testing (teardown not included). Note that we don't need the `losetup`-stuff, we know where everything is.

### Compile
```sh
gcc fs-watcher.c json-writer.c -o fa2json
```
### Create image file
```sh
mktemp /tmp/fa2json-test-XXXXXX.img
```

```text
/tmp/fa2json-test-UrwpOb.img
```

```sh
truncate -s 10M /tmp/fa2json-test-UrwpOb.img
```

```sh
mkfs.ext4 /tmp/fa2json-test-UrwpOb.img
```

```text
mke2fs 1.47.3 (8-Jul-2025)
Discarding device blocks: done
Creating filesystem with 10240 1k blocks and 2560 inodes
Filesystem UUID: 035c508e-dec0-4a21-a4d1-1efb6fa72415
Superblock backups stored on blocks:
        8193

Allocating group tables: done
Writing inode tables: done
Creating journal (1024 blocks): done
Writing superblocks and filesystem accounting information: done
```


### Create mount point

```sh
mktemp -d /tmp/fa2json-mnt-XXXXXX
```

```text
/tmp/fa2json-mnt-ts2Dik
```

### Mount loop device
```sh
sudo mount /tmp/fa2json-test-UrwpOb.img /tmp/fa2json-mnt-ts2Dik/
```

> [!NOTE]
> In a different terminal I now ran - but we could do this after `chown` or possibly `chown` + `sync`?
> ```sh
> fa2json /tmp/fa2json-mnt-ts2Dik
> ```

### Let current user own file system
```sh
sudo chown $(id -u) /tmp/fa2json-mnt-ts2Dik/
```

#### `fa2json` output
```json
{"ts": [1772658052, 704412412, 386988, 865842867], "name": "/tmp/fa2json-mnt-ts2Dik/.", "mask": 1073741828}
```

### Touch marker
```sh
touch /tmp/fa2json-mnt-ts2Dik/MARKER
```

#### `fa2json` output
```json
{"ts": [1772658064, 151070715, 387000, 312501190], "name": "/tmp/fa2json-mnt-ts2Dik/MARKER", "mask": 256}
{"ts": [1772658064, 151099105, 387000, 312529600], "name": "/tmp/fa2json-mnt-ts2Dik/MARKER", "mask": 12}
```