Update webext docs

Author: iinuwa

creds-ui/data/meson.build

@@ -81,4 +81,4 @@ if get_option('profile') == 'development'
     build_by_default: true,
     build_always_stale: true,
   )
-endif
+endif

webext/README.md

@@ -5,10 +5,49 @@ Currently, this is written only for Firefox; there will be some slight API tweak
 
 This requires some setup to make it work:
 
-1. Copy `app/credential_manager_shim.json` to `~/.mozilla/native-messaging-hosts/credential_manager_shim.json`.
-2. In the copied file, replace the `path` key with the absolute path to `app/credential_manager_shim.py`
+# Prerequisites
+
+Currently, this web extension relies on the `dbus-next` to interact with D-Bus
+services. If you have that package installed in your system Python, this
+should work. You can test using the following:
+
+```shell
+python3 -c 'import dbus_next; print("dbus-next is installed")'
+```
+
+If that completes without error, then you're good to go. Otherwise, you have a
+couple of options:
+
+- Install the system package for your operating system, for example:
+  ```shell
+  # Fedora
+  dnf install python3-dbus-next
+  # Debian/Ubuntu
+  apt install python3-dbus-next
+  # Arch
+  pacman -S python-dbus-next
+  ```
+- Modify the shebang to point to a Python instance that does have the package installed.
+  ```shell
+  cd webext/
+  python3 -m venv env
+  source ./env/bin/activate
+  pip3 install dbus-next
+  echo "Change the first line in webext/app/credential_manager_shim.py to:"
+  echo "#!$(readlink -f ./env/bin/python3)"
+  # Update the shebang to point to the absolute path to webext/env/bin/python3
+  ```
+
+# Setup Instructions
+
+(Note: Paths are relative to root of this repository)
+
+1. Copy `webext/app/credential_manager_shim.json` to `~/.mozilla/native-messaging-hosts/credential_manager_shim.json`.
+2. In the copied file, replace the `path` key with the absolute path to `webext/app/credential_manager_shim.py`
 3. Open Firefox and go to `about:debugging`
-4. Click "This Firefox" > Load Temporary Extension. Select `add-on/manifest.json`
-6. Build and run the `xyz-iinuwa-credential-manager-portal-gtk` binary to start the D-Bus service.
-5. Navigate to [https://webauthn.io]().
-6. Run through the registration and creation process.
+4. Click "This Firefox" > Load Temporary Extension. Select `webext/add-on/manifest.json`
+5. Build with `ninja -C ./build` and run the following binaries binary to start the D-Bus services.
+   - `GSCHEMA_SCHEMA_DIR=build/creds-ui/data ./build/creds-ui/target/debug/creds-ui`
+   - `./build/credsd/target/debug/credsd`
+6. Navigate to [https://webauthn.io]().
+7. Run through the registration and creation process.