misc/history_rewrite/run.sh

#!/bin/sh
# to be run from a clone of https://chromium.googlesource.com/chromium/tools/build.git

# This first one rewrites the parent information, fixes the author email
# addresses, and prunes out large swaths of the committed repos, to make the
# tree-filter below faster.
#
# This should be processing just over 9000 commits.
if [ ! "$FILTERDIR" ]; then
  echo '$FILTERDIR is not set'
  exit
fi

git --no-replace-objects filter-branch -f --prune-empty --index-filter ". $FILTERDIR/index_filter.sh" --env-filter ". $FILTERDIR/env_filter.sh" --parent-filter ". $FILTERDIR/parent_filter.sh" -- 70d6a3c2d97de862e9f678745d0763b14d385c18~..HEAD

# This saves the previously filtered history to filtered1, in case you want to
# run the tree-filter below multiple times (e.g. in case you're modifying the
# tree filter to get a better result).
git update-ref refs/heads/filtered1 HEAD

# /STAGING is used to mv files during the tree-filter phase. Since this is
# dangerous, it's commented out.
rm -rf $HOME/STAGING
mkdir $HOME/STAGING
chown $USER $HOME/STAGING

# Actually rewrite all the trees. This should be processing ~5000 commits.
git --no-replace-objects filter-branch -f --prune-empty --tree-filter ". $FILTERDIR/tree_filter.sh 2> /dev/null"