suppress nc errors when checking if host is up

the motivation for this is so we can prompt the user to open the
server console once installed, and run exec ssh mc@<ip> to do so

this commit copies the authorized_keys from root user to the user
'mc', and adds 'screen -r' and then 'exit' to the .bashrc

README.md

@@ -1,15 +1,16 @@
 ## ever wanted to:
-- play minecraft but the server was too expensive to host 
+- play minecraft but the server was too expensive to host for just a 
-for just a little play session?
+little play session?
 - have a minecraft world you wanted to play with your friends as a 
 one off thing?
 
 ## introducing: auto-mc-redux! 
 
-this is a modified version of the [script](https://git.skeh.site/ida/auto-mc) i maintain for automatically 
+this is a modified version of the 
-installing minecraft (on `apt` based distrobutions) and intigrating it 
+[script](https://git.skeh.site/ida/auto-mc) i maintain for 
-with systemd. this aims to create a virtual machine, create the 
+automatically installing minecraft (on `apt` based distrobutions) 
-appropriate firewall rules, and install minecraft with a world that's 
+and intigrating it with systemd. this aims to create a virtual 
-kept in an s3 bucket, until you give it the command to un-deploy it, 
+machine, create the appropriate firewall rules, and install 
-where it'll back up the world to the s3 bucket, and then unprovision the 
+minecraft with a world that's kept in an s3 bucket, until you give 
-server!
+it the command to un-deploy it, where it'll back up the world to the 
+s3 bucket or your local computer, and then unprovision the server!

automate.sh

@@ -42,7 +42,7 @@ cat <<- 'EOF' > /etc/systemd/system/mc-server.service
 EOF
 chown root:root /etc/systemd/system/mc-server.service
 mkdir -p /root/.local/bin/
-echo "PATH=/root/.local/bin/:$PATH" >> /root/.bashrc #FIXME: needs to me made impodent
+echo 'PATH="/root/.local/bin:$PATH"' > /root/.bashrc
 
 cat <<- 'EOF' > /root/.local/bin/mc-backup
 	#!/usr/bin/env bash
@@ -50,16 +50,27 @@ cat <<- 'EOF' > /root/.local/bin/mc-backup
 	tar -c -f - /srv/minecraft/server/ | zstd
 EOF
 
+touch /root/.hushlogin
 chown root:root /root/.local/bin/mc-backup
 chmod 755 /root/.local/bin/mc-backup
 
+if [ -e /server.tar.zstd ]; then
+	echo 'unpacking server backup...'
+	tar -C / --zstd --overwrite -x /server.tar.zstd
+fi
+
 # find the latest release of the requested version and download it
 echo "downloading minecraft $VERSION..."
 RELEASE=`curl -s https://api.papermc.io/v2/projects/paper/versions/$VERSION/ | jq -r .builds[-1]`
 curl https://api.papermc.io/v2/projects/paper/versions/$VERSION/builds/$RELEASE/downloads/paper-$VERSION-$RELEASE.jar -o /srv/minecraft/server/paperclip.jar
 
-chown -R mc:mc /srv/minecraft/
+mkdir /home/mc/.ssh
-su mc -c 'echo "eula=true" > /srv/minecraft/server/eula.txt'
+cp /root/.ssh/authorized_keys /home/mc/.ssh/authorized_keys
+chown -R mc:mc {/srv/minecraft/,/home/mc/.ssh/authorized_keys}
+su mc -c \
+	'echo "screen -r" >> /home/mc/.bashrc
+	echo "exit" >> /home/mc/.bashrc
+	echo "eula=true" > /srv/minecraft/server/eula.txt'
 
 # what they say on the tin
 echo "loading units..."

deploy.sh

@@ -21,12 +21,19 @@ fi
 versionprompt
 echo -n "Waiting for machine to respond"
 # tests if ssh is up, waiting one second between attempts
-until nc $ipv4_address 22 <<<'' | grep -q 'SSH'; do
+until nc $ipv4_address 22 <<<'' 2> /dev/null | grep -q 'SSH'; do
 	echo -n '.'
 	sleep 1
 done
 echo
 
+data_dir get
+
+if [ -f "$data_dir/server.tar.zstd" ]; then
+	echo "Uploading server backup..."
+	scp "$data_dir/server.tar.zstd" root@$ipv4_address:/server.tar.zstd
+fi
+
 echo "Now installing!"
 ssh root@$ipv4_address < <(cat <(echo VERSION=$version) ./automate.sh)
 

functions.sh

@@ -1,6 +1,31 @@
 # required for the complex pipes
 shopt -s lastpipe
 
+data_dir() {
+	local command="$1"; shift
+
+	case $command in
+		get)
+			if [ -d "${XDG_DATA_HOME}/auto-mc-redux" ]; then
+			  data_dir="${XDG_DATA_HOME}/auto-mc-redux"
+			elif [ -d "$HOME/.local/share/auto-mc-redux" ]; then
+			  data_dir="${HOME}/.local/share/auto-mc-redux"
+			else
+				data_dir create
+			fi
+		;;
+		create)
+		  if [ -z ${XDG_DATA_HOME+x} ]; then
+		    mkdir -p "${HOME}/.local/share/auto-mc-redux"
+		    data_dir="${HOME}/.local/share/auto-mc-redux"
+		  else
+		    mkdir -p "${XDG_DATA_HOME}/auto-mc-redux"
+		    data_dir="${XDG_DATA_HOME}/auto-mc-redux"
+		  fi
+		;;
+	esac
+}
+
 config() {
 	local command="$1"; shift
 

undeploy.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+install_dir="$(dirname "$(readlink -f "$0")")" # find the install directory
+source "$install_dir/functions.sh"
+
+data_dir get
+machine show ipv4 | jq -r .ip_address | read ipv4_address
+ssh root@$ipv4_address <<<mc-backup > "$data_dir/server.tar.zstd"
+machine destroy