diff --git a/githooks/pre-push b/githooks/pre-push
new file mode 100644
index 00000000000..179a9b86343
--- /dev/null
+++ b/githooks/pre-push
@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+
+source "$(dirname -- $BASH_SOURCE)/../tools/unix/find-python3.sh"
+PYTHON_PATH=$(get_python3)
+if [[ -z "$PYTHON_PATH" ]]; then
+  echo
+  echo "python3 is required for formatting and was not found"
+  echo
+  echo "ERROR: you must either install python3 and try pushing again or run `git push` with `--no-verify`"
+  exit 1
+fi
+
+while read LOCAL_REF LOCAL_SHA REMOTE_REF REMOTE_SHA
+do
+  git fetch origin master &>/dev/null
+  # Check all local changes, not present in origin/master, for lint.
+  set +e
+  $PYTHON_PATH "$(dirname -- $BASH_SOURCE)/../tools/cross/format.py" --check git --source $LOCAL_SHA --target origin/master
+  EXIT_CODE=$?
+  set -e
+  case $EXIT_CODE in
+    0)
+      # No lint.
+      ;;
+    1)
+      echo
+      echo "ERROR: changes in $LOCAL_REF have lint which may fail CI."
+      echo
+      echo "To fix lint:"
+      echo "  python3 ./tools/cross/format.py"
+      echo
+      exit 1
+      ;;
+    2)
+      echo
+      echo "ERROR: failed to run format.py, Pass '--no-verify' or '-n' to skip."
+      echo
+      exit 1
+      ;;
+  esac
+done
+
diff --git a/tools/unix/apply-big-move.sh b/tools/unix/apply-big-move.sh
new file mode 100644
index 00000000000..810572f34a2
--- /dev/null
+++ b/tools/unix/apply-big-move.sh
@@ -0,0 +1,181 @@
+#! /bin/bash
+#
+# This script applies the most recent "big change".
+#
+# This script is designed so that it can help you rebase an in-flight PR across this change. Once
+# the big move has been merged, you may simply run this script inside your branch, and it will
+# take care of updating your change in order to avoid any merge conflicts.
+#
+# How it does this:
+# 1. Rebases your change to the commit just before the Big Move.
+# 2. Applies the same logical changes that the Big Move did, but now applies this to the changes
+#    on your branch too.
+# 3. Rewrites git history so that your commits are now based on the commit immediately after the
+#    Big Move.
+#
+# To use the script, just run it in your branch. It'll take care of everything, and you'll end up
+# with the changes in your branch all based on the commit after The Big Move.
+
+set -euo pipefail
+
+AFTER_MOVE_TAG=after-big-move-1
+BEFORE_MOVE_TAG=before-big-move-1
+NEXT_BIG_MOVE=before-big-move-2
+ORIG_BRANCH=$(git branch --show-current)
+
+fail() {
+  echo -e '\e[0;1;31mFAILED:\e[0m '"$@" >&2
+  exit 1
+}
+
+check_big_move_dependencies() {
+  source "$(dirname -- $BASH_SOURCE)/find-python3.sh"
+  PYTHON_PATH=$(get_python3)
+  if [[ -z "$PYTHON_PATH" ]]; then
+    fail "Cannot find python3. Run install python3 first."
+  fi
+}
+
+apply_big_move() {
+  echo "Applying format..."
+
+  source "$(dirname -- $BASH_SOURCE)/find-python3.sh"
+  PYTHON_PATH=$(get_python3)
+  $PYTHON_PATH "$(dirname -- $BASH_SOURCE)/../cross/format.py"
+
+  echo "Changes applied successfully."
+}
+
+rebase_and_rerun() {
+  # Rebase on top of tag $1 and then run the script again.
+
+  BASE=$1
+
+  echo -e '\e[0;1;34mRebasing onto tag '"$BASE"'...\e[0m'
+  git rebase $BASE || \
+      fail "Rebase had conflicts. Please resolve them and run the script again."
+  git submodule update
+
+  # Make sure we're using the correct version of the script by starting it over.
+  exec ./apply-big-move.sh
+}
+
+check_for_next_move() {
+  # Check if there's a new "Big Move" in the future and, if so, prompt the user to apply it too.
+
+  if git describe $NEXT_BIG_MOVE >/dev/null 2>&1; then
+    while true; do
+      echo -en '\e[0;1;33mIt looks like there is another big move after this one. Should we apply it now? [y/n]\e[0m '
+      read -n1 CHOICE
+      echo
+      case "$CHOICE" in
+        y | Y )
+          rebase_and_rerun $NEXT_BIG_MOVE
+          ;;
+        n | N )
+          echo "OK. When you are ready, please run the script again to apply the next move."
+          exit 0
+          ;;
+      esac
+      echo "??? Please press either y or n."
+    done
+  fi
+}
+
+main() {
+  if [ "x$(git status --untracked-files=no --porcelain)" != "x" ]; then
+    fail "You have uncommitted changes. Please commit or discard them first."
+  fi
+
+  check_big_move_dependencies
+
+  # Use --apply to just apply the Big Move changes to the current tree without committing or
+  # rewriting any history. This is intended to be used to create the Big Move commit in the first
+  # place.
+  if [ "${1:-}" = "--apply" ]; then
+    apply_big_move
+    exit 0
+  fi
+
+  # Make sure our tags are up-to-date so we can find the relevant Big Move tags.
+  echo "Fetching tags..."
+  git fetch origin --tags --force
+
+  # Check that the Big Move is actually ready. (This script will be committed to the repo before
+  # the Big Move itself is, so this checks if someone is running the script too early.)
+  if ! git describe $BEFORE_MOVE_TAG >/dev/null 2>&1; then
+    fail "The Big Move hasn't happened yet (tags not found)."
+  fi
+
+  # Check if we already applied The Big Move in this branch, as indicated by $AFTER_MOVE_TAG being
+  # in our history.
+  if git merge-base --is-ancestor $AFTER_MOVE_TAG HEAD; then
+    # This branch already includes The Big Move, but maybe there is a future Big Move and the
+    # user was actually intending to apply that?
+    if git describe $NEXT_BIG_MOVE >/dev/null 2>&1; then
+      # Indeed there is, let's skip forward to that.
+      rebase_and_rerun $NEXT_BIG_MOVE
+    fi
+
+    echo "The Big Move has already been applied to this branch."
+    exit 0
+  fi
+
+  # Check if $BEFORE_MOVE_TAG is in this branch's history. If not, we need to rebase first.
+  if ! git merge-base --is-ancestor $BEFORE_MOVE_TAG HEAD; then
+    # Branch is not yet based on $BEFORE_MOVE_TAG, so rebase onto it.
+    rebase_and_rerun $BEFORE_MOVE_TAG
+    fail "(can't get here -- rebase_and_rerun should not return)"
+  fi
+
+  # Get the list of commits that we need to rebase over The Big Move.
+  COMMITS=($(git log --reverse --format='%H' $BEFORE_MOVE_TAG..HEAD))
+
+  # Checkout $AFTER_MOVE_TAG in order to start building on it.
+  git checkout -q $AFTER_MOVE_TAG
+  git submodule update
+
+  # Apply each commit.
+  for COMMIT in ${COMMITS[@]}; do
+    git log -1 --format='%CblueRewriting commit %h:%Creset %s' $COMMIT
+
+    # Update the working tree to match the code from the source commit.
+    git checkout $COMMIT .
+    git submodule update
+
+    # Apply the Big Move on top of that.
+    apply_big_move
+
+    # Commit to edgeworker (including updating the workerd submodule), reusing the old commit
+    # message. It's possible that the diff is now empty, in which case we skip this commit, much
+    # like `git rebase` does by default.
+    if git commit -a --dry-run > /dev/null 2>&1; then
+      git commit -aC $COMMIT
+    fi
+  done
+
+  # Record the final commit.
+  FINAL_COMMIT=$(git log -1 --format=%H)
+
+  # Check out the original branch, and reset it to the final commit.
+  git checkout -q "$ORIG_BRANCH"
+  git reset --hard "$FINAL_COMMIT"
+
+  # Success!
+  echo -e '\e[0;1;32mSUCCESS:\e[0m Applied Big Move.'
+
+  # Check if there's another move upcoming that we should apply next.
+  check_for_next_move
+
+  exit 0
+}
+
+# Ensure that if the file changes while bash is reading it, bash won't go off the rails. Normally,
+# bash reads one line from the file at a time and then executes it before reading the next.
+# Wrapping the whole script body in a function ensures that bash buffers it in memory. Placing
+# `exit 0` on the same line ensures that bash won't attempt to read anything more after the
+# function returns.
+#
+# This ensures that if further changes are made to this file before the Big Move actually happens,
+# then the rebase command that rebases to the commit before the Big Move won't confuse bash.
+main "$@"; exit 0
diff --git a/tools/unix/find-python3.sh b/tools/unix/find-python3.sh
new file mode 100644
index 00000000000..6966fcb81b3
--- /dev/null
+++ b/tools/unix/find-python3.sh
@@ -0,0 +1,21 @@
+
+get_python3() {
+  # Search for python3
+  python=$(which python3 2>/dev/null)
+
+  # If not found, search for python
+  if [ -z "$python" ]; then
+    python=$(which python 2>/dev/null)
+    if [ -n "$python" ]; then
+      local python_version=$($python -V 2>&1 | head -n 1 | cut -d ' ' -f 2- | cut -d '.' -f1)
+      if [ "$python_version" != "3" ]; then
+        unset python
+      fi
+    fi
+  fi
+
+  if [ -z "$python" ]; then
+    return
+  fi
+  echo "$python"
+}