From ff12d6752047becb6c3aa120f20cbb283c9b2780 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Sat, 1 Jan 2022 22:14:35 +0100
Subject: initial commit

---
 save-graph | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100755 save-graph

diff --git a/save-graph b/save-graph
new file mode 100755
index 0000000..005e6be
--- /dev/null
+++ b/save-graph
@@ -0,0 +1,68 @@
+#!/bin/bash
+
+graph=$(
+  tinc --net=$1 dump digraph
+)
+
+pre=$(
+  printf '%s\n' "${graph}" \
+  | sed '
+    / -> /,$ d
+  '
+)
+post=$(
+  printf '%s\n' "${graph}" \
+  | sed '
+    1,/ -> /d
+    / -> /d
+  '
+)
+inter=$(
+  printf '%s\n' "${graph}" \
+  | sed -n '
+    / -> /p
+  ' \
+  | while read -r a b c d; do
+    mapfile -t e < <(
+      printf '%s\n' "$a" "$c" \
+      | sort
+    )
+    b4=$(
+      printf '%s\n' "$d" \
+      | base64 -w0
+    )
+    printf '%s %s %s %s %s\n' \
+      "${a}" "${c}" "${b4}" "${e[0]}" "${e[1]}"
+  done \
+  | sort -k4,4 -k5,5 -k3,3 \
+  | uniq -cf2 \
+  | while read -r c a b b4 _ _; do
+    printf '%s -> %s ' "${a}" "${b}"
+    printf '%s\n' "${b4}" \
+    | base64 -d \
+    | if [ "${c}" = '1' ]; then
+      cat
+    else
+      sed 's@];$@, dir=both\0@'
+    fi
+  done
+)
+
+if printf '%s\n' "${graph}" \
+| grep -qwF backup \
+&& printf '%s\n' "${graph}" \
+| greo -qwF backup_lo; then
+  extra='
+"backup" -> "backup_lo" [style=dashed, constraint=false, dir=none];'
+else
+  extra=''
+fi
+
+{
+  printf '%s\n' "${pre}" "${inter}" "${extra}" "${post}"
+} \
+| if [ $# -eq 0 ]; then
+  /usr/bin/dot -Tpng
+else
+  cat
+fi
-- 
cgit v1.2.3-70-g09d2