refactor install.sh

install.sh

@@ -1,12 +1,51 @@
 #!/bin/sh
 
-set -eux
-cd ${LIB_DIR:-/lib}
-sudo git clone https://git.joeac.net/joeac/joeac.net.git
-cd joeac.net
-sudo chmod +x uninstall.sh update_and_restart.sh restart.sh
-sudo echo << EOF >> ${CRONTABS_DIR:-/etc/cron.d}/joeacnet
+install_prerequisite_software ()
+{
+    if [ -n "$(which git)" ]
+    then
+        echo "Git is already installed."
+    elif [ -n "$(which apk)" ]
+    then
+        apk update
+        apk add git
+    elif [ -n "$(which apt-get)" ]
+    then
+        apt-get update
+        apt-get install git
+    elif [ -n "$(which dnf)" ]
+    then
+        dnf install git
+    elif [ -n "$(which yum)" ]
+    then
+        yum install git
+    elif [ -n "$(which pacman)" ]
+    then
+        pacman -S git
+    else
+        echo "Could not install Git: could not identify package manager."
+        exit 1
+    fi
+}
+
+clone_repository ()
+{
+    cd ${LIB_DIR:-/lib}
+    git clone https://git.joeac.net/joeac/joeac.net.git
+    cd joeac.net
+    chmod +x uninstall.sh update_and_restart.sh restart.sh
+}
+
+add_cron_services ()
+{
+    echo <<- EOF > ${CRONTABS_DIR:-/etc/cron.d}/joeacnet
 @reboot ${LIB_DIR:-/lib}/joeac.net/restart.sh
 10 * * * * ${LIB_DIR:-/lib}/joeac.net/update_and_restart.sh
 EOF
+}
+
+set -eux
+install_prerequisite_software
+clone_repository
+add_cron_services
 ./restart.sh