add establish-annex-link

builds/utils/establish-annex-link

@@ -0,0 +1,116 @@
+#!/bin/bash
+
+printf "This tool is for establishing sshfs links to transfer git-annex repo contents.\n"
+
+printf "server or client?\n"
+printf 'EITHER OF `s` or `c`\n'
+
+read -p "?> "
+
+case "$REPLY" in
+	s)
+		printf "[] ensure that port 22 is unfiltered\n"
+		sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT
+
+		printf "[] starting sshd\n"
+		sudo systemctl start sshd
+
+		WIRELESS_INTERFACE=$(
+			nmcli --get-values GENERAL.DEVICE,GENERAL.TYPE device show |
+			sed '/^wifi/!{h;d;};x' |
+			head -n1)
+
+		IP_OF_INTERFACE=$(
+			ip address show dev $WIRELESS_INTERFACE |
+			grep 'inet ' |
+			awk -F' ' '{print $2}' |
+			awk -F'/' '{print $1}')
+
+		printf "[] instruct client to connect to %s\n" "$IP_OF_INTERFACE"
+
+		printf "[] waiting to stop sshd\n"
+
+		read
+
+		sudo systemctl stop sshd
+
+		printf "[] sshd stopped, but port 22 still open\n"
+		;;
+	c)
+		printf "What IP to connect to?\n"
+		printf "ENSURE THAT the IP is accessable on the current VLAN\n"
+
+		printf 'ONE OF `ipv4 address`'
+
+		read -p "?> " ADDRESS
+
+		INFORMED_GUESS=$(ssh usr@$ADDRESS hostname)
+		if [ -z "$INFORMED_GUESS" ]; then
+			printf "What hostname?\n"
+
+			mkdir -p ~/annex-remotes
+			ls ~/annex-remotes
+
+			read -p "?> " REMOTE_HOST
+		else
+			REMOTE_HOST=$INFORMED_GUESS
+			printf "[] using hostname %s\n" "$INFORMED_GUESS"
+		fi
+
+		printf "[] mounting fs via sshfs\n"
+
+		mkdir -p ~/annex-remotes/$REMOTE_HOST
+		fusermount3 -qu ~/annex-remotes/$REMOTE_HOST
+		sshfs usr@$ADDRESS:/home/usr/annex ~/annex-remotes/$REMOTE_HOST
+
+		printf "[] mounted fs\n"
+
+		# check if the fuse mount worked
+		df_output=$(df -h | grep -c '/home/usr/annex')
+		if [ "$df_output" -eq 0 ]; then
+			printf "It seems the sshfs mount didn't work. Exiting.\n"
+			exit 1
+		fi
+
+		# check if we need to make a copy of the annex on the new device
+		if [ ! -d ~/annex-remotes/$REMOTE_HOST/.git ]; then
+			printf "Should I do that with the current computer's git-annex store?\n\n"
+
+			printf '`y`) initialize with the local store\n'
+			printf '`n`) no, just mount the sshfs\n'
+
+			read -p '?> '
+
+			case $REPLY in
+				y)
+					cd ~/annex-remotes/$REMOTE_HOST
+					printf "[] cloning the local git-annex store\n"
+					git clone -v ~/annex
+
+					shopt -s dotglob # include dotfiles and dotdirs in wildcard
+					mv ./annex/* . # move everything up a dir
+
+					if find "annex" -maxdepth 1 -type f -o -type d -empty; then # if annex is empty...
+						printf "[] removing spurious ./annex directory\n"
+						rm -r ./annex # ...remove it
+					fi
+
+					git annex init "$REMOTE_HOST"
+					cd ~/annex
+					git remote add $REMOTE_HOST ~/annex-remotes/$REMOTE_HOST
+					;;
+			esac # it's okay that the `n` and `*` cases fall-through
+		fi
+
+		printf "[] waiting to stop sshfs\n"
+
+		read
+
+		fusermount3 -u ~/annex-remotes/$REMOTE_HOST
+
+		printf "[] unmounted sshfs\n"
+		;;
+	*)
+		printf "unknown\n"
+		;;
+esac