cceckman · May 20, 2023 16:10 · May 20, 2023
diff --git a/rm2-tailscale.sh b/rm2-tailscale.sh
@@ -0,0 +1,114 @@
+#!/bin/sh
+#
+# Original: https://github.com/cceckman/homelab/blob/main/helpers/rm2-tailscale.sh
+# I am the original author of this document and release it into the public domain.
+# Go wild.
+# 
+# This script enables [Tailscale] on a [reMarkable 2] tablet.
+#
+# Tailscale is run in [userspace networking] mode, so any outbound applications
+# will need to be configured to proxy via tailscaled.
+#
+# The script assumes you've set up SSH to the tablet, as described in
+# https://remarkablewiki.com/tech/ssh, and that it's locally connected
+# (not just via Tailscale) during setup.
+#
+# [Tailscale]: https://tailscale.com
+# [reMarkable 2]: https://remarkable.com/
+# [userspace networking]: https://tailscale.com/kb/1112/userspace-networking/
+#
+set -eu
+
+if ! test "$#" = "1"
+then
+  echo >&2 "Requires a single argument: reMarkable address"
+  echo >&2 "(Typically 10.11.99.1)"
+  exit 1
+fi
+
+TARGET="$1"
+TSINSTALLPATH="~/tailscale"
+
+CONTENT="$(mktemp -d)/"
+build_tailscale() {
+  # Build Tailscale:
+  # https://github.com/fako1024/go-remarkabl://github.com/fako1024/go-remarkable
+  # This is where I usually download things - not necessarily GOMODCACHE.
+  TSPATH="$HOME"/r/github.com/tailscale/tailscale
+  if ! test -d "$TSPATH"
+  then
+    echo >&2 "Downloading tailscale source..."
+    mkdir -p "$(dirname "$TSPATH")"
+    git clone --depth 1 https://github.com/tailscale/tailscale.git "$TSPATH"
+  fi
+
+  # We're building for a small device. We aren't trying to squeeze onto the root
+  # partition, but we still want to leave more space for docs if we can.
+  #
+  # Use https://tailscale.com/kb/1207/small-tailscale,
+  # and tags+flags pulled from build_dist.
+  echo >&2 "Building tailscale..."
+  GOOS=linux GOARCH=arm GOARM=7 \
+    go build \
+    -o "$CONTENT"/tailscale.combined \
+    -C "$TSPATH" \
+    -tags ts_include_cli,ts_omit_aws,ts_omit_tap,ts_omit_kube \
+    -ldflags "-w -s" \
+    ./cmd/tailscaled
+  echo >&2 "Tailscale binary up-to-date in $CONTENT"
+
+  # Capture the service file too.
+  cp "$TSPATH"/cmd/tailscaled/tailscaled.service "$CONTENT"
+}
+
+# Build in a subshell, so cd doesn't move us.
+( build_tailscale )
+
+cat <<EOF >"$CONTENT"/setup.sh
+
+set -eu
+
+# Sometimes Remarkable's OS doesn't update resolv.conf ?
+# https://www.reddit.com/r/RemarkableTablet/comments/miogzb/solution_cloud_service_connection_issue_when
+
+# Install files to their proper locations:
+ls -lah $TSINSTALLPATH
+chown -R root:root $TSINSTALLPATH
+
+echo >&2 "Installing binaries and service definitions..."
+set -x
+# Link from the /usr paths to our install location
+ln -sf $TSINSTALLPATH/tailscale.combined /usr/bin/tailscale
+ln -sf $TSINSTALLPATH/tailscale.combined /usr/sbin/tailscaled
+ln -sf $TSINSTALLPATH/tailscaled.service /etc/systemd/system/tailscaled.service
+set +x
+
+# Tailscale expects some configuration in a drop-in unit or config files;
+# the tailscale.service definition includes PORT and FLAGS variables.
+# We oblige!
+# The reMarkable kernel doesn't appear to have CONFIG_TUN (no /dev/net/tun),
+# so we have to try userspace-networking:
+# https://tailscale.com/kb/1112/userspace-networking/
+cat <<EOS >/etc/default/tailscaled
+PORT=41641
+FLAGS="--tun userspace-networking --socks5-server=localhost:1055 --outbound-http-proxy-listen=localhost:1055"
+EOS
+
+
+echo >&2 "Reloading systemd..."
+systemctl daemon-reload
+
+echo >&2 "Starting tailscale..."
+systemctl enable tailscaled
+systemctl restart tailscaled
+tailscale up
+EOF
+chmod +x "$CONTENT/setup.sh"
+
+echo >&2 "Connecting and uploading..."
+ssh -o ConnectTimeout=5 "$TARGET" \
+  "echo >&2 'Connected to reMarkable!'; rm -rf $TSINSTALLPATH; mkdir -p $TSINSTALLPATH" >&2
+rsync -avz "$CONTENT" "$TARGET:$TSINSTALLPATH"
+
+echo >&2 "Running setup..."
+ssh "$TARGET" "$TSINSTALLPATH/setup.sh"
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