Merge pull request #56 from Heshdude/fix/git-installer-script

Fix/git installer script

Author: agentmilindu

installers/git/installer.sh

@@ -6,19 +6,33 @@ APT_GET_CMD=$(which apt-get) # apt package manager for Ubuntu & other Debian bas
 PACMAN_CMD=$(which pacman) # pacman package manager for ArchLinux
 APK_CMD=$(which apk) # apk package manager for Alpine
 
+USER="$(id -un 2>/dev/null || true)"
+PREFIX=''
+if [ "$USER" != 'root' ]; then
+	if command_exists sudo; then
+		PREFIX='sudo'
+	else
+		cat >&2 <<-'EOF'
+		Error: this installer needs the ability to run commands as root.
+		We are unable to find "sudo". Make sure its available to make this happen
+		EOF
+		exit 1
+	fi
+fi
+
  if [ ! -z $APT_GET_CMD ]; then
-    sudo apt-get update
-    sudo apt-get install git
+    $PREFIX apt-get update
+    $PREFIX apt-get install git
  elif [ ! -z $DNF_CMD ]; then
-    sudo dnf install git
+    $PREFIX dnf install git
  elif [ ! -z $YUM_CMD ]; then
-    sudo yum install git
+    $PREFIX yum install git
  elif [ ! -z $PACMAN_CMD ]; then
     pacman -Sy git
  elif [ ! -z $APK_CMD ]; then
-    sudo apk add git
+    $PREFIX apk add git
  else
-    echo "Couldn't install package"
+    echo "Couldn't find an installer matching to this package"
     exit 1;
  fi