feat: Taildrive shares

Share homeassistant directories to your Tailnet using Taildrive.

Author: ananthb

tailscale/DOCS.md

@@ -437,3 +437,5 @@ SOFTWARE.
 [tailscale_info_tags]: https://tailscale.com/kb/1068/tags
 [tailscale_info_taildrop]: https://tailscale.com/kb/1106/taildrop
 [tailscale_info_userspace_networking]: https://tailscale.com/kb/1112/userspace-networking
+[tailscale_info_taildrive]: https://tailscale.com/kb/1369/taildrive
+[tailscale_info_taildrop]: https://tailscale.com/kb/1106/taildrop

tailscale/config.yaml

@@ -24,7 +24,14 @@ privileged:
 devices:
   - /dev/net/tun
 map:
+  - homeassistant_config:rw
+  - addon_config:rw
+  - ssl:rw
+  - addons:rw
+  - backup:rw
   - share:rw
+  - media:rw
+  - all_addon_configs:rw
 ports:
   41641/udp: null
 schema:
@@ -43,4 +50,6 @@ schema:
   tags:
     - "match(^tag:[a-zA-Z][a-zA-Z0-9-]*$)?"
   taildrop: bool?
+  taildrive:
+    - "match(^(?i:(homeassistant_config|addon_config|ssl|addons|backup|share|media))$)"
   userspace_networking: bool?

tailscale/rootfs/etc/s6-overlay/s6-rc.d/taildrive/dependencies.d/post-tailscaled

@@ -0,0 +1,46 @@
+#!/command/with-contenv bashio
+# shellcheck shell=bash
+# ==============================================================================
+# Home Assistant Community Add-on: Tailscale
+# Exposes Home Assistant directories over Taildrive
+# ==============================================================================
+
+# Read configured directories from the add-on configuration.
+if ! mapfile -t configured_share_names < <(bashio::config "taildrive"); then
+    bashio::exit.nok "Error reading configured directories from add-on configuration."
+fi
+
+# Read currently shared directories into an array from tailscale drive list.
+# The output of which looks like:
+# name    path    as
+# ----    ----    --
+# config  /config  config
+if ! mapfile -t active_share_names < <(/opt/tailscale drive list | tail -n +3 | awk '{print $1}'); then
+    bashio::exit.nok "Error reading shared directories from Tailscale."
+fi
+
+# If a directory is configured but not shared, share it.
+for share_name in "${configured_share_names[@]}"; do
+    if ! printf '%s\0' "${active_share_names[@]}" | grep -Fxqz -- "${share_name}"; then
+        # Rewrite homeasstant_config to config
+        if [[ "${share_name}" == "homeassistant_config" ]]; then
+            share_name="config"
+        fi
+
+        # Share the directory
+        /opt/tailscale drive share "${share_name}" "/${share_name}"
+    fi
+done
+
+# If a directory is shared but not configured, unshare it.
+for share_name in "${active_share_names[@]}"; do
+    if ! printf '%s\0' "${configured_share_names[@]}" | grep -Fxqz -- "${share_name}"; then
+        # Rewrite homeasstant_config to config
+        if [[ "${share_name}" == "homeassistant_config" ]]; then
+            share_name="config"
+        fi
+
+        # Unshare the directory
+        /opt/taildrive drive unshare "${share_name}"
+    fi
+done

tailscale/rootfs/etc/s6-overlay/s6-rc.d/taildrive/run

@@ -0,0 +1 @@
+oneshot

tailscale/rootfs/etc/s6-overlay/s6-rc.d/taildrive/type

@@ -0,0 +1 @@
+/etc/s6-overlay/s6-rc.d/taildrive/run

tailscale/rootfs/etc/s6-overlay/s6-rc.d/taildrive/up

@@ -86,6 +86,12 @@ configuration:
       This option allows you to enable Taildrop, a file sharing service
       that allows you to share files with other Tailscale nodes.
       When not set, this option is enabled by default.
+  taildrive:
+    name: Taildrive Shares
+    description: >-
+      This option allows you to specify which Home Assistant directories you
+      want to share with other Tailscale nodes using Taildrive.
+      The listed values are the only allowed values.
   userspace_networking:
     name: Userspace networking mode
     description: >-