A script to validate your local gem cache against the public s3 repositories. If you find mismatches that contain both local and remote values, please post them in comments. For Rbenv

validate_local_cache.sh

#!/usr/bin/env sh

set -e

if ! which md5sum > /dev/null; then
  echo Install md5sum
  exit 1
fi

if ! which curl > /dev/null; then
  echo Install curl
  exit 1
fi

echo This will take a while...

rbenv_versions=$HOME/.rbenv/versions
versions=$(ls $rbenv_versions)

for version in $versions; do
  echo Checking rbenv Ruby version $version
  home=$rbenv_versions/$version
  cache=$home/lib/ruby/gems/*/cache

  echo Now checking gems in $cache
  for gem in $cache/*.gem; do
    gemfile=$(basename $gem)

    local=$(md5sum $gem | awk '{print $1}')
    remote=$(curl -s -D - -X HEAD -H 'Connection:close' http://production.cf.rubygems.org/gems/$gemfile | grep 'ETag' | cut -d '"' -f 2)

    if [[ ! $local = $remote ]]; then
      echo $gemfile mismatch. local: $local, remote: $remote
    fi
  done

done

echo All done.

validate_local_cache_openssl.sh

#!/usr/bin/env sh

set -e

if ! which openssl > /dev/null; then
  echo Install openssl
  exit 1
fi

if ! which curl > /dev/null; then
  echo Install curl
  exit 1
fi

rbenv_versions=$HOME/.rbenv/versions
versions=$(ls $rbenv_versions)

for version in $versions; do
  echo Checking rbenv Ruby version $version
  home=$rbenv_versions/$version
  cache=$home/lib/ruby/gems/*/cache

  echo Now checking gems in $cache
  for gem in $cache/*.gem; do
    gemfile=$(basename $gem)

    local=$(openssl md5 $gem | awk '{print $2}')
    remote=$(curl -s -D - -X HEAD -H 'Connection:close' http://production.cf.rubygems.org/gems/$gemfile | grep 'ETag' | cut -d '"' -f 2)

    if [[ ! $local = $remote ]]; then
      echo $gemfile mismatch. local: $local, remote: $remote
    fi
  done

done

echo All done.

For OSX users, install md5sum via hombrew: brew install md5sha1sum