Add support for installation on Alpine Linux

Author: Wrong-Code

DnsServerApp/DnsServerApp.csproj

@@ -23,6 +23,9 @@
 	</ItemGroup>
 
 	<ItemGroup>
+		<None Update="openrc.service">
+			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+		</None>
 		<None Update="start.bat">
 			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
 		</None>

DnsServerApp/install.sh

@@ -1,5 +1,14 @@
 #!/bin/sh
 
+cleanup() {
+    # On Alpine Linux get rid of virtual packages
+    if $alpineLinux; then
+        apk del .deps >> $installLog 2>&1
+    fi
+}
+
+trap cleanup INT TERM EXIT
+
 dotnetDir="/opt/dotnet"
 dotnetVersion="8.0"
 dotnetRuntime="Microsoft.AspNetCore.App 8.0."
@@ -27,6 +36,29 @@ echo ""
 mkdir -p $dnsDir
 echo "" > $installLog
 
+if command -v apk >/dev/null 2>&1
+then
+    # On Alpine Linux we need bash & curl to install dotnet
+    alpineLinux=true
+    apk update >> $installLog 2>&1
+    deps=""
+    # Check for bash
+    if ! command -v bash >/dev/null 2>&1; then
+        deps="$deps bash"
+    fi
+    # Check for curl
+    if ! command -v curl >/dev/null 2>&1; then
+        deps="$deps curl"
+    fi
+    # Install missing packages, if any
+    if [ -n "$deps" ]; then
+        echo "Installing packages needed for the installation: $deps"
+        apk add --no-cache --virtual .deps $deps
+    fi
+else
+    alpineLinux=false
+fi
+
 if dotnet --list-runtimes 2> /dev/null | grep -q "$dotnetRuntime"; 
 then
     dotnetFound="yes"
@@ -49,6 +81,12 @@ else
 
     curl -sSL $dotnetUrl | bash /dev/stdin -c $dotnetVersion --runtime aspnetcore --no-path --install-dir $dotnetDir --verbose >> $installLog 2>&1
 
+    # On Alpine Linux dotnet requires libstdc++
+    if $alpineLinux; then
+        echo "Installing ASP.NET Core Runtime dependencies..."
+        apk add --no-cache libstdc++ >> $installLog 2>&1
+    fi
+
     if [ ! -f "/usr/bin/dotnet" ]
     then
         ln -s $dotnetDir/dotnet /usr/bin >> $installLog 2>&1
@@ -166,34 +204,58 @@ fi
 
 echo ""
 
-if ! [ "$(ps --no-headers -o comm 1 | tr -d '\n')" = "systemd" ] 
+installed=false
+if [ "$(ps -o comm 1 | grep -v COMMAND)" = "systemd" ] 
 then
-    echo "Failed to install Technitium DNS Server: systemd was not detected."
-    echo "Please read the 'Installing DNS Server Manually' section in this blog post to understand how to manually install the DNS server on your distro: https://blog.technitium.com/2017/11/running-dns-server-on-ubuntu-linux.html"
-    exit 1
-fi
+    if [ -f "/etc/systemd/system/dns.service" ]
+    then
+        echo "Restarting systemd service..."
+        systemctl restart dns.service >> $installLog 2>&1
+    else
+        echo "Configuring systemd service..."
+        cp $dnsDir/systemd.service /etc/systemd/system/dns.service
+        systemctl enable dns.service >> $installLog 2>&1
+        
+        systemctl stop systemd-resolved >> $installLog 2>&1
+        systemctl disable systemd-resolved >> $installLog 2>&1
+        
+        systemctl start dns.service >> $installLog 2>&1
+        
+        rm /etc/resolv.conf >> $installLog 2>&1
+        echo -e "# Generated by Technitium DNS Server Installer\n\nnameserver 127.0.0.1" > /etc/resolv.conf 2>> $installLog
+        
+        if [ -f "/etc/NetworkManager/NetworkManager.conf" ]
+        then
+            echo -e "[main]\ndns=default" >> /etc/NetworkManager/NetworkManager.conf 2>> $installLog
+        fi
+    fi
+    installed=true
 
-if [ -f "/etc/systemd/system/dns.service" ]
+elif [ -x "/sbin/rc-service" ]
 then
-    echo "Restarting systemd service..."
-    systemctl restart dns.service >> $installLog 2>&1
-else
-    echo "Configuring systemd service..."
-    cp $dnsDir/systemd.service /etc/systemd/system/dns.service
-    systemctl enable dns.service >> $installLog 2>&1
-    
-    systemctl stop systemd-resolved >> $installLog 2>&1
-    systemctl disable systemd-resolved >> $installLog 2>&1
-    
-    systemctl start dns.service >> $installLog 2>&1
-    
-    rm /etc/resolv.conf >> $installLog 2>&1
-    echo -e "# Generated by Technitium DNS Server Installer\n\nnameserver 127.0.0.1" > /etc/resolv.conf 2>> $installLog
-    
-    if [ -f "/etc/NetworkManager/NetworkManager.conf" ]
+    if [ -f "/etc/init.d/dns" ]
     then
-        echo -e "[main]\ndns=default" >> /etc/NetworkManager/NetworkManager.conf 2>> $installLog
+        echo "Restarting OpenRC service..."
+        rc-service dns stop >> $installLog 2>&1
+        rc-service dns start >> $installLog 2>&1
+    else
+        echo "Configuring OpenRC service..."
+        cp $dnsDir/openrc.service /etc/init.d/dns
+        chmod +x /etc/init.d/dns
+        rc-update add dns >> $installLog 2>&1
+        rc-service dns start >> $installLog 2>&1
+
+        rm /etc/resolv.conf >> $installLog 2>&1
+        echo -e "# Generated by Technitium DNS Server Installer\n\nnameserver 127.0.0.1" > /etc/resolv.conf 2>> $installLog
     fi
+    installed=true
+fi
+
+if ! $installed
+then
+    echo "Failed to install Technitium DNS Server: systemd or OpenRC were not detected."
+    echo "Please read the 'Installing DNS Server Manually' section in this blog post to understand how to manually install the DNS server on your distro: https://blog.technitium.com/2017/11/running-dns-server-on-ubuntu-linux.html"
+    exit 1
 fi
 
 echo ""