Merge pull request #4 from arnested/install

Add install script

.github/workflows/shellcheck.yml

@@ -0,0 +1,13 @@
+name: Shellcheck
+on:
+- pull_request
+- push
+
+jobs:
+  shellcheck:
+    name: shellcheck
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Run shellcheck
+      uses: ludeeus/[email protected]

README.md

@@ -20,18 +20,6 @@ https://my-fancy.local).
 
 ## Install
 
-Download the binary and installed it as e.g. `/usr/local/bin/ldddns`.
-
-```console
-sudo sh -c "curl --fail -sSL -o /usr/local/bin/ldddns https://github.com/arnested/ldddns/releases/latest/download/ldddns_$(uname -s)_$(uname -m) && chmod +x /usr/local/bin/ldddns"
-```
-
-Create a systemd service unit file:
-```console
-sudo sh -c "/usr/local/bin/ldddns > /etc/systemd/system/ldddns.service"
-```
-
-Enable and start the service unit:
 ```console
-sudo systemctl enable --now ldddns.service
+curl -fsSL https://raw.githubusercontent.com/arnested/ldddns/main/install.sh | bash
 ```

install.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+
+if [ -z "$BASH" ] ;then echo Please run this with bash; exit 1; fi
+
+set -euo pipefail
+
+ldddns_install() {
+    set -euo pipefail
+
+    tmpdir="$(mktemp -d)"
+
+    # Make a cleanup function
+    cleanup() {
+        rm --recursive --force -- "${tmpdir}"
+    }
+    trap cleanup EXIT
+
+    echo Downloading ldddns binary
+    curl --proto =https --fail -sSL -o "${tmpdir}/ldddns" "https://github.com/arnested/ldddns/releases/latest/download/ldddns_$(uname -s)_$(uname -m)"
+
+    chmod +x "${tmpdir}/ldddns"
+
+    install_dir=/usr/local/libexec/ldddns
+
+    echo Making directory \(${install_dir}\) for installing service binary
+    mkdir -p "${install_dir}"
+
+    echo Installing service binary in ${install_dir}
+    mv "${tmpdir}/ldddns" "${install_dir}"
+
+    echo Generating systemd service unit
+    "${install_dir}/ldddns" > "${tmpdir}/ldddns.service"
+
+    echo Installing systemd service unit in /etc/systemd/system/ldddns.service
+    mv "${tmpdir}/ldddns.service" /etc/systemd/system/ldddns.service
+
+    echo Reloading systemd daemon
+    systemctl daemon-reload
+
+    if systemctl is-active --quiet ldddns.service; then
+        echo Found existing, running ldddns.service - restarting it
+        systemctl restart ldddns.service
+    fi
+
+    echo Enabling systemd service
+    systemctl enable --now ldddns.service;
+}
+
+pkexec bash -c "$(declare -f ldddns_install) ; ldddns_install"