add scripts/dbdiff.sh to compare sqlite3 databases (defaults to srs.db)

scripts/dbdiff.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+if [ "$1" = "-h" ]; then
+	echo "usage: $0 [-h] [database] [sha1] [sha2]"
+	echo "  -h         show this help"
+	echo "  database   databases to compare (defaults to resources/srs.db"
+	echo "  sha1	   sha of previous state (defaults to HEAD^)"
+	echo "  sha2	   sha of next state (defaults to HEAD)"
+	exit 1
+fi
+
+set -e
+
+db=${1:-resources/srs.db}
+prev=${2:-HEAD^}
+next=${3:-HEAD}
+
+echo "db:$db prev:$prev next:$next"
+
+git cat-file blob $prev:resources/srs.db >/tmp/prev.db
+git cat-file blob $next:resources/srs.db >/tmp/next.db
+
+sqlite3 /tmp/prev.db .dump >/tmp/prev.sql
+sqlite3 /tmp/next.db .dump >/tmp/curr.sql
+
+diff -u /tmp/prev.sql /tmp/curr.sql
+
+rm /tmp/prev.db /tmp/next.db /tmp/prev.sql /tmp/curr.sql