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Enhance ResolvConf migration to support multiple DHCP script variants

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This update allows the service to correctly patch both /etc/udhcpc.d/50default and /opt/Bose/udhcpc.script (used in SoundTouch 10 firmware) for DNS redirection. It also improves robustness by adding file existence checks in rc.local and ensures clean state by reverting to .original backups during migration.
This commit is contained in:
Tobias Gesellchen
2026-02-16 18:52:25 +01:00
parent 95f5e9c831
commit 6aef2b807d
3 changed files with 198 additions and 13 deletions
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docs/guides/SOUNDTOUCH-SERVICE.md
+15 -7
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@@ -257,9 +257,9 @@ The most robust and flexible DNS-based migration method. It utilizes the device'
**How it works:**
1. **Configuration**: A custom file named `/mnt/nv/aftertouch.resolv.conf` is created on the device's persistent partition.
2. **Boot Hook**: On every boot, `/mnt/nv/rc.local` checks if the system's DHCP script (`/etc/udhcpc.d/50default`) has been patched.
3. **Surgical Patch**: If not patched, it injects a one-line check into the DHCP script.
4. **Resolution**: Whenever the device acquires a DHCP lease, the script now reads your `aftertouch.resolv.conf` first, placing your DNS server at the top of `/etc/resolv.conf` while keeping all other DHCP-provided settings.
2. **Boot Hook**: On every boot, `/mnt/nv/rc.local` checks if the system's DHCP scripts (`/etc/udhcpc.d/50default` or `/opt/Bose/udhcpc.script`) have been patched.
3. **Surgical Patch**: If not patched, it injects a one-line check into the relevant DHCP scripts.
4. **Resolution**: Whenever the device acquires a DHCP lease, the scripts now read your `aftertouch.resolv.conf` first, placing your DNS server at the top of `/etc/resolv.conf` while keeping all other DHCP-provided settings.
**Setup:**
1. Enable SSH via the `remote_services` USB trick.
@@ -272,11 +272,19 @@ The most robust and flexible DNS-based migration method. It utilizes the device'
3. Update `/mnt/nv/rc.local` with the idempotent patch:
```sh
#!/bin/sh
TARGET_FILE="/etc/udhcpc.d/50default"
# Aftertouch DNS hook: prioritizes our custom nameserver if it exists
HOOK_MARKER="/mnt/nv/aftertouch.resolv.conf"
if ! grep -q "$HOOK_MARKER" "$TARGET_FILE"; then
# Inject our config after the search domain line
sed -i '/echo "search \$domain"/a \ [ -f '"$HOOK_MARKER"' ] && cat '"$HOOK_MARKER" "$TARGET_FILE"
if [ -f "$HOOK_MARKER" ]; then
# Patch 50default if it exists
TARGET_FILE="/etc/udhcpc.d/50default"
if [ -f "$TARGET_FILE" ] && ! grep -q "$HOOK_MARKER" "$TARGET_FILE"; then
sed -i '/echo "search \$domain"/a \ [ -f '"$HOOK_MARKER"' ] && cat '"$HOOK_MARKER"' && dns=""' "$TARGET_FILE"
fi
# Patch udhcpc.script if it exists (e.g. SoundTouch 10)
TARGET_SCRIPT="/opt/Bose/udhcpc.script"
if [ -f "$TARGET_SCRIPT" ] && ! grep -q "$HOOK_MARKER" "$TARGET_SCRIPT"; then
sed -i '/echo "search \$search_list # \$interface" >> \$RESOLV_CONF/a \ [ -f '"$HOOK_MARKER"' ] && cat '"$HOOK_MARKER"' >> '"$RESOLV_CONF"' && dns=""' "$TARGET_SCRIPT"
fi
fi
```
4. Make the script executable: `chmod +x /mnt/nv/rc.local`.