From 2910a89d6c59b997a3896f05c6ad7fb65c26f813 Mon Sep 17 00:00:00 2001
From: Eugen Wissner <belka@caraus.de>
Date: Wed, 9 Dec 2020 18:28:42 +0100
Subject: Add autoupdater

---
 private/nix/doinst.sh | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 private/nix/doinst.sh

(limited to 'private/nix/doinst.sh')

diff --git a/private/nix/doinst.sh b/private/nix/doinst.sh
new file mode 100644
index 0000000..032197f
--- /dev/null
+++ b/private/nix/doinst.sh
@@ -0,0 +1,25 @@
+config() {
+  NEW="$1"
+  OLD="$(dirname $NEW)/$(basename $NEW .new)"
+  # If there's no config file by that name, mv it over:
+  if [ ! -r $OLD ]; then
+    mv $NEW $OLD
+  elif [ "$(cat $OLD | md5sum)" = "$(cat $NEW | md5sum)" ]; then
+    # toss the redundant copy
+    rm $NEW
+  fi
+  # Otherwise, we leave the .new copy for the admin to consider...
+}
+
+preserve_perms() {
+  NEW="$1"
+  OLD="$(dirname $NEW)/$(basename $NEW .new)"
+  if [ -e $OLD ]; then
+    cp -a $OLD ${NEW}.incoming
+    cat $NEW > ${NEW}.incoming
+    mv ${NEW}.incoming $NEW
+  fi
+  config $NEW
+}
+
+preserve_perms etc/rc.d/rc.nix.new
-- 
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