From 4bc723dca49dce9e920095b144387bf116a759b0 Mon Sep 17 00:00:00 2001
From: ShaneTheAwesome <shane.880088.supw@gmail.com>
Date: Thu, 19 Dec 2019 13:42:00 +0400
Subject: [PATCH] Add update delta checking

---
 conf/resdl-download.txt | 32 ++++++++++++++++++++++++++++++++
 update.sh               |  5 +++--
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/conf/resdl-download.txt b/conf/resdl-download.txt
index 70180b4..3513c73 100644
--- a/conf/resdl-download.txt
+++ b/conf/resdl-download.txt
@@ -55,6 +55,7 @@ pre_update_actions() {
 post_update_actions() {
 
   unzipmaps;
+  updatedelta;
   return 0;
 
 }
@@ -73,3 +74,34 @@ unzipmaps() {
   rm -rf "$resdldir/$mapsfile.zip";
 
 }
+
+updatedelta() {
+
+  echo " ";
+  echo " - Checking resdl delta between updates...";
+
+  newlog=""
+  oldlogs=""
+  for log in $(ls -t $reldir/update-*.log); do
+    [ "$newlog" ] && oldlogs="$oldlogs $(basename "$log")" || newlog="$(basename "$log")";
+  done;
+  [ "$oldlogs" ] || { echo " -- No old logs to compare"; return 0; }
+  for entry in $(cat "$reldir/$newlog" | grep -Po "FILE: [^,]*" | cut -d" " -f2); do
+    line="$(grep "FILE: $entry," "$reldir/$newlog")";
+    file="$entry";
+    url="$(echo $line | grep -Po "URL: [^,]*" | cut -d" " -f2)";
+    oldurl="";
+    for log in $oldlogs; do
+      oldurl="$(grep "FILE: $file," "$reldir/$log" | grep -Po "URL: [^,]*" | cut -d" " -f2)";
+      [ "$oldurl" ] && break;
+    done;
+    [ "$oldurl" ] || oldurl="None";
+    /usr/bin/[ "$url" == "$oldurl" ] && continue;
+    echo " -- Updated file: $file"
+    echo "   ++ Old URL: $oldurl"
+    echo "   ++ New URL: $url"
+    echo "   ++ Old name: $(basename $oldurl)"
+    echo "   ++ New name: $(basename $url)"
+  done;
+
+}
diff --git a/update.sh b/update.sh
index 119620c..ce9b876 100755
--- a/update.sh
+++ b/update.sh
@@ -5,9 +5,10 @@ workdir="$(pwd)";
 cd "$workdir";
 confdir="$workdir/conf";
 resdldir="$workdir/resdl";
+reldir="$workdir/releases";
 tmpdir="$workdir/tmp";
 updatetime="$(date -u +%Y%m%d%H%M%S)";
-updatelog="$workdir/releases/update-$updatetime.log";
+updatelog="$reldir/update-$updatetime.log";
 
 echo " ";
 echo "--       Minimal MicroG Update Script       --";
@@ -37,7 +38,7 @@ mkdir -p "$tmpdir" "$tmpdir/repos" "$(dirname "$updatelog")";
 [ -f "$confdir/resdl-download.txt" ] || { echo " "; echo "F: No resdl-download.txt found"; return 1; }
 eval "$(cat "$confdir/resdl-download.txt")" || { echo "FATAL: resdl-download.txt cannot be executed"; return 1; };
 
-if [ $@ ]; then
+if [ "$*" ]; then
   echo " ";
   echo " - Building update list...";
   stuff_download_new="";