Git pre-push hook to check that specs have been run.

pre-push

#!/bin/sh

# Pre-push check that specs have been run against HEAD.

# ignore projects that don't have a spec directory and spec_helper
if [[ -e "spec" && -e "spec/spec_helper.rb" ]]; then
  if grep -Fxq "# Write .spec_sha for pre-push hook" spec/spec_helper.rb; then
    local_sha="`git log -n 1 --pretty=format:%H`"

    # if the .spec_sha file doesn't exist or the sha doesn't match run rake
    if ! [[ -e ".spec_sha" &&  "$local_sha" == `cat .spec_sha` ]]; then
      echo "Specs have not been run since the last commit, running specs with 'rake'."
      rake
      exit $?
    fi
  else
    # prepend a line to spec_helper.rb that writes the .spec_sha file
    echo "Adding code to spec_helper to write the .spec_sha file."
    echo "File.write('.spec_sha', %x[git log -n 1 --pretty=format:%H])" | cat - spec/spec_helper.rb > /tmp/out && mv /tmp/out spec/spec_helper.rb
    echo "# Write .spec_sha for pre-push hook" | cat - spec/spec_helper.rb > /tmp/out && mv /tmp/out spec/spec_helper.rb
    exit 1
  fi
fi

exit 0