chore: better handle ports on Pi and allow albyhub to run on port 80

scripts/pi-arm/README.md

@@ -1,23 +1,15 @@
-### Installation on a Raspberry Pi Zero
+### Installation on a Raspberry Pi Zero (arm)
 
 Have a look at our [installation guide](https://guides.getalby.com/user-guide/v/alby-account-and-browser-extension/alby-hub/alby-hub-flavors/raspberry-pi-zero) for more details.
 
-```shell
- $ ssh [email protected] '/bin/bash -c "$(curl -fsSL https://getalby.com/install/hub/pi-zero-install.sh)"'
- ```
-
-or on the Pi directly:
+SSH into your Pi and run:
 ```shell
 /bin/bash -c "$(curl -fsSL https://getalby.com/install/hub/pi-zero-install.sh)"
 ```
 
 ### Updating a running instance
 
-```shell
- $ ssh [email protected] '/bin/bash -c "$(curl -fsSL https://getalby.com/install/hub/pi-zero-install.sh)"'
- ```
-
-or on the Pi directly:
+SSH into your Pi and run:
 ```shell
 /bin/bash -c "$(curl -fsSL https://getalby.com/install/hub/pi-zero-update.sh)"
 ```

scripts/pi-arm/install.sh

@@ -12,16 +12,29 @@ wget https://getalby.com/install/hub/server-linux-armv6.tar.bz2
 
 # Extract archives
 tar -xvf server-linux-armv6.tar.bz2
-if [[ $? -eq 0 ]]; then
+if [[ $? -ne 0 ]]; then
   echo "Failed to unpack Alby Hub. Potentially bzip2 is missing"
   echo "Install it with sudo apt-get install bzip2"
 fi
 
 # Cleanup
 rm server-linux-armv6.tar.bz2
 
+# allow albyhub to bind on port 80
+sudo setcap CAP_NET_BIND_SERVICE=+eip /opt/albyhub/bin/albyhub
+
+# Use port 80 if available otherwise 8029
+if sudo lsof -Pi :80 -sTCP:LISTEN -t >/dev/null ; then
+  PORT=8029
+  URL="http://$HOSTNAME.local:8029"
+else
+  PORT=80
+  URL="http://$HOSTNAME.local"
+fi
+
 ### Create systemd service
-sudo tee -a /etc/systemd/system/albyhub.service > /dev/null << EOF
+if [[ ! -e /etc/systemd/system/albyhub.service ]]; then
+  sudo tee -a /etc/systemd/system/albyhub.service > /dev/null << EOF
 [Unit]
 Description=Alby Hub
 After=network-online.target
@@ -36,7 +49,7 @@ ExecStart=/opt/albyhub/bin/albyhub
 # Hack to ensure Alby Hub never uses more than 90% CPU
 CPUQuota=90%
 
-Environment="PORT=80"
+Environment="PORT=$PORT"
 Environment="WORK_DIR=/opt/albyhub/data"
 Environment="LDK_ESPLORA_SERVER=https://electrs.getalbypro.com"
 Environment="LOG_EVENTS=true"
@@ -45,11 +58,12 @@ Environment="LDK_GOSSIP_SOURCE="
 [Install]
 WantedBy=multi-user.target
 EOF
+fi
 
 sudo systemctl enable albyhub
 sudo systemctl start albyhub
 
 echo ""
 echo ""
-echo "✅ Installation finished! Please visit http://$HOSTNAME.local to configure your new Alby Hub."
+echo "✅ Installation finished! Please visit $URL to configure your new Alby Hub."
 echo ""