From c7c46dc15da980fb36731abdce4600408e4a9eb3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mikael=20L=C3=B6vqvist?= <mikael.lovqvist.mail@gmail.com>
Date: Wed, 4 Mar 2026 22:18:11 +0100
Subject: [PATCH] Added manual experiment file

---
 test/Manual experiment.md | 82 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 test/Manual experiment.md

diff --git a/test/Manual experiment.md b/test/Manual experiment.md
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+## 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}
+```
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