scripts: add commit-script-check.sh from bitcoin core

Author: jonatack

scripts/commit-script-check.sh

@@ -0,0 +1,57 @@
+#!/bin/sh
+# Copyright (c) 2009-present The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+# This simple script checks for commits beginning with: scripted-diff:
+# If found, looks for a script between the lines -BEGIN VERIFY SCRIPT- and
+# -END VERIFY SCRIPT-. If no ending is found, it reads until the end of the
+# commit message.
+
+# The resulting script should exactly transform the previous commit into the
+# current one. Any remaining diff signals an error.
+
+export LC_ALL=C
+if test -z "$1"; then
+    echo "Usage: $0 <commit>..."
+    exit 1
+fi
+
+if ! sed --help 2>&1 | grep -q 'GNU'; then
+    echo "Error: the installed sed package is not compatible. Please make sure you have GNU sed installed in your system.";
+    exit 1;
+fi
+
+if ! grep --help 2>&1 | grep -q 'GNU'; then
+    echo "Error: the installed grep package is not compatible. Please make sure you have GNU grep installed in your system.";
+    exit 1;
+fi
+
+RET=0
+PREV_BRANCH=$(git name-rev --name-only HEAD)
+PREV_HEAD=$(git rev-parse HEAD)
+for commit in $(git rev-list --reverse "$1"); do
+    if git rev-list -n 1 --pretty="%s" "$commit" | grep -q "^scripted-diff:"; then
+        git checkout --quiet "$commit"^ || exit
+        SCRIPT="$(git rev-list --format=%b -n1 "$commit" | sed '/^-BEGIN VERIFY SCRIPT-$/,/^-END VERIFY SCRIPT-$/{//!b};d')"
+        if test -z "$SCRIPT"; then
+            echo "Error: missing script for: $commit" >&2
+            echo "Failed" >&2
+            RET=1
+        else
+            echo "Running script for: $commit" >&2
+            echo "$SCRIPT" >&2
+            (eval "$SCRIPT")
+            git --no-pager diff --exit-code "$commit" && echo "OK" >&2 || (echo "Failed" >&2; false) || RET=1
+        fi
+        git reset --quiet --hard HEAD
+     else
+        if git rev-list "--format=%b" -n1 "$commit" | grep -q '^-\(BEGIN\|END\)[ a-zA-Z]*-$'; then
+            echo "Error: script block marker but no scripted-diff in title of commit $commit" >&2
+            echo "Failed" >&2
+            RET=1
+        fi
+    fi
+done
+git checkout --quiet "$PREV_BRANCH" 2>/dev/null || git checkout --quiet "$PREV_HEAD"
+exit $RET