Set up busybox ash link in 'scripts/release.sh build-and-test'.

This lets us run without _tmp, i.e. from a clean repo.

scripts/release.sh

@@ -91,6 +91,7 @@ build-and-test() {
  # Make sure
  test/spec.sh smoke

  test/spec.sh link-busybox-ash  # in case we deleted _tmp
  test/spec.sh all

  # Build the oil tar

test/spec.sh

@@ -33,11 +33,15 @@ readonly REF_SHELLS=($DASH $BASH $MKSH)
# Setup
#

link-busybox-ash() {
  mkdir -p $(dirname $BUSYBOX_ASH)
  ln -s -f --verbose "$(which busybox)" $BUSYBOX_ASH
}

# dash and bash should be there by default on Ubuntu.
install-shells() {
  sudo apt-get install busybox-static mksh zsh
  mkdir -p _tmp/shells
  ln -s -f --verbose "$(which busybox)" $BUSYBOX_ASH
  link-busybox-ash
}

# TODO: Maybe do this before running all tests.