Add support for Taildrive

tailscale/DOCS.md

@@ -74,6 +74,14 @@ stateful_filtering: false
 tags:
   - tag:example
   - tag:homeassistant
+taildrive:
+  addons: false
+  addon_configs: false
+  backup: false
+  config: false
+  media: false
+  share: false
+  ssl: false
 taildrop: true
 userspace_networking: true
 ```
@@ -320,6 +328,15 @@ They need to start with `tag:`.
 
 More information: [Tags][tailscale_info_tags]
 
+### Option: `taildrive`
+
+This option allows you to specify which Home Assistant directories you want to
+share with other Tailscale nodes using Taildrive.
+
+Only the listed directories are available.
+
+More information: [Taildrive][tailscale_info_taildrive]
+
 ### Option: `taildrop`
 
 This add-on supports [Tailscale's Taildrop][tailscale_info_taildrop] feature,
@@ -462,5 +479,6 @@ SOFTWARE.
 [tailscale_info_site_to_site]: https://tailscale.com/kb/1214/site-to-site
 [tailscale_info_subnets]: https://tailscale.com/kb/1019/subnets
 [tailscale_info_tags]: https://tailscale.com/kb/1068/tags
+[tailscale_info_taildrive]: https://tailscale.com/kb/1369/taildrive
 [tailscale_info_taildrop]: https://tailscale.com/kb/1106/taildrop
 [tailscale_info_userspace_networking]: https://tailscale.com/kb/1112/userspace-networking

tailscale/config.yaml

@@ -22,9 +22,24 @@ privileged:
 devices:
   - /dev/net/tun
 map:
+  - addons:rw
+  - all_addon_configs:rw
+  - backup:rw
+  - homeassistant_config:rw
+  - media:rw
   - share:rw
+  - ssl:rw
 ports:
   41641/udp: null
+options:
+  taildrive:
+    addons: false
+    addon_configs: false
+    backup: false
+    config: false
+    media: false
+    share: false
+    ssl: false
 schema:
   accept_dns: bool?
   accept_routes: bool?
@@ -41,5 +56,13 @@ schema:
   stateful_filtering: bool?
   tags:
     - "match(^tag:[a-zA-Z][a-zA-Z0-9-]*$)?"
+  taildrive:
+    addons: bool
+    addon_configs: bool
+    backup: bool
+    config: bool
+    media: bool
+    share: bool
+    ssl: bool
   taildrop: bool?
   userspace_networking: bool?

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

@@ -0,0 +1,68 @@
+#!/command/with-contenv bashio
+# shellcheck shell=bash
+export LOG_FD
+# ==============================================================================
+# Home Assistant Community Add-on: Tailscale
+# Exposes Home Assistant directories over Taildrive
+# ==============================================================================
+
+# These are not arrays, but newline separated lists (single strings)
+declare all_share_names
+declare configured_share_names
+declare active_share_names
+
+declare share_name
+
+# Read all possible and configured directories from the add-on configuration.
+if ! all_share_names=$(bashio::config 'taildrive' | jq -rc 'keys_unsorted[]') || \
+  ! configured_share_names=$(bashio::config 'taildrive' | jq -rc 'to_entries[] | select(.value) | .key')
+then
+  bashio::exit.nok "Error reading configured Taildrive directories from add-on configuration."
+fi
+
+# Check if Taildrive is available
+if ! /opt/tailscale status --self=true --peers=false --json \
+  | jq -rce '.Self.CapMap | has("drive:share")' > /dev/null;
+then
+  # If Taildrive is not available but any share is configured, that is an error
+  if (( 0 < $(wc -w <<< "${configured_share_names}") )); then
+    bashio::exit.nok "Tailscale's Taildrive is disabled but directories are configured for sharing"
+  fi
+else
+  # Read currently shared directories into an array from tailscale drive list.
+  # The output of which looks like:
+  # name      path       as
+  # ------    -------    ----
+  # config    /config    root
+  if ! active_share_names=$(/opt/tailscale drive list | tail -n +3 | awk '{print $1}'); then
+    bashio::exit.nok "Error reading shared Taildrive directories from Tailscale."
+  fi
+
+  ln -s "/homeassistant" "/config"
+
+  # If a directory is configured but not shared, share it.
+  for share_name in "${configured_share_names}"; do
+    if ! grep -Fxq -- "${share_name}" <<< "${active_share_names}"; then
+      bashio::log.info "Taildrive: sharing /${share_name}"
+      if ! /opt/tailscale drive share "${share_name}" "/${share_name}"; then
+        bashio::exit.nok "Failed to share /${share_name}"
+      fi
+    else
+      bashio::log.info "Taildrive: /${share_name} is already shared"
+    fi
+  done
+
+  # If a directory is shared but not configured, and managed by this add-on, unshare it.
+  for share_name in "${active_share_names}"; do
+    if ! grep -Fxq -- "${share_name}" <<< "${configured_share_names}"; then
+      if grep -Fxq -- "${share_name}" <<< "${all_share_names}"; then
+        bashio::log.info "Taildrive: unsharing /${share_name}"
+        if ! /opt/tailscale drive unshare "${share_name}"; then
+          bashio::exit.nok "Failed to unshare /${share_name}"
+        fi
+      else
+        bashio::log.info "Taildrive: skipping to unshare '${share_name}'"
+      fi
+    fi
+  done
+fi

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

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

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

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

tailscale/translations/en.yaml

@@ -88,6 +88,12 @@ configuration:
     description: >-
       This option allows you to specify specific ACL tags for this
       Tailscale instance. They need to start with `tag:`.
+  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.
+      Only the listed directories are available.
   taildrop:
     name: Taildrop
     description: >-