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-# common
-OCI layer for things that need to be on every bluefin
+# bluefin-common
 
-## TODO
+Shared OCI layer containing common configuration files used across all Bluefin variants (bluefin, bluefin-dx, bluefin-lts).
 
-Split this repo into common and bluefin specific so Aurora can copy out what is image agnostic, that way we can share config. 
+## What's Inside
+
+This layer contains two main configuration directories:
+
+### `/etc/ublue-os/` - System Configuration
+- Bling - CLI theming settings
+- Fastfetch settings - System information display configuration
+- Setup configuration - First-boot and system setup parameters
+
+### `/usr/share/ublue-os/` - User-Space Configuration
+- Firefox defaults - Pre-configured Firefox settings
+- Flatpak overrides - Application-specific Flatpak configurations
+- Just recipes - Additional command recipes for system management
+- MOTD templates - Message of the day and tips
+- Setup hooks - Scripts for privileged, system, and user setup stages
+
+## Usage in Containerfile
+
+Reference this layer as a build stage and copy the directories you need:
+
+### Copy everything:
+```dockerfile
+FROM ghcr.io/ublue-os/bluefin-common:latest AS bluefin-common
+
+# Copy all system files
+COPY --from=bluefin-common /system_files /
+```
+
+### Copy only system configuration:
+
+This is what Aurora should use, gives shares the common set of files and keeps the images opinions seperate.
+
+```dockerfile
+FROM ghcr.io/ublue-os/bluefin-common:latest AS bluefin-common
+
+# Copy only /etc configuration
+COPY --from=bluefin-common /system_files/etc /etc
+```
+
+### Copy only the image opinion:
+```dockerfile
+FROM ghcr.io/ublue-os/bluefin-common:latest AS bluefin-common
+
+# Copy only /usr/share configuration
+COPY --from=bluefin-common /system_files/usr /usr
+```
+
+## Building Locally
+
+```bash
+just build
+```