verify-jar-cache

#!/bin/bash
#
# Discovers files whose sha sum does not match the
# sha embedded in their directory name from ~/.sbt/cache/scala.
# Pass -f to remove them, otherwise it just prints them.

set -e
cd ~/.sbt/cache/scala
unset failed

unset removal
[[ "$1" == "-f" ]] && removal=true

for file in $(find . -type f); do
  sha=$(echo "${file:2}" | sed 's/\/.*$//')
  sum=$(shasum "$file" | sed 's/ .*$//')
  if [[ $sum != $sha ]]; then
    failed=true
    if [[ -n "$removal" ]]; then
      echo "Removing corrupt file $file, shasum=$sum"
      rm -rf $sha
    else
      echo "Found corrupt file $file, shasum=$sum."
    fi
  fi
done

if [[ -z "$failed" ]]; then
  echo "All cached files match their shas."
elif [[ -z "$removal" ]]; then
  echo ""
  echo "Run again with -f to remove the corrupt files."
fi