build_needed.sh

#!/bin/bash

set -e

# We need an absolute path to the dir we're in.
XCTOOL_DIR=$(cd $(dirname $0); pwd)

# Will be a short git hash or just '.' if we're not in a git repo.
REVISION=$((\
  git --git-dir="${XCTOOL_DIR}/.git" log -n 1 --format=%h 2> /dev/null) || \
  echo ".")

# If we're in a git repo, figure out if any changes have been made to xctool.
if [[ "$REVISION" != "." ]]; then
  NUM_CHANGES=$(\
    (cd "$XCTOOL_DIR" && git status --porcelain "$XCTOOL_DIR") | wc -l)
  HAS_GIT_CHANGES=$([[ $NUM_CHANGES -gt 0 ]] && echo YES || echo NO)
else
  HAS_GIT_CHANGES=NO
fi

BUILD_OUTPUT_DIR="$XCTOOL_DIR"/build/$REVISION
XCTOOL_PATH="$BUILD_OUTPUT_DIR"/Products/Release/bin/xctool

if [[ -e "$XCTOOL_PATH" && $REVISION != "." && $HAS_GIT_CHANGES == "NO" && \
      "$1" != "TEST_AFTER_BUILD=YES" ]];
then
  echo 0
else
  echo 1
fi

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