update-build.sh

#!/bin/bash

# configuration
PACKAGE_NAME="slate-cbl-baxter"
PACKAGE_PATH="sencha-workspace/packages/$PACKAGE_NAME"
SOURCE_BRANCH="master"
BUILD_BRANCH="builds/v1"


# environmental requirements
test "$(git symbolic-ref --short -q HEAD)" = "$SOURCE_BRANCH" || { echo >&2 "Current branch must be $SOURCE_BRANCH"; exit 1; }
test -z "$(git status --porcelain)" || { echo >&2 "Working tree must be clean"; exit 1; }
command -v underscore >/dev/null 2>&1 || { echo >&2 "Please run: npm install -g underscore-cli"; exit 1; }


# ensure source branch is up-to-date
git pull --ff-only origin $SOURCE_BRANCH >/dev/null 2>&1 || { echo >&2 "Could not fast-fwd $SOURCE_BRANCH"; exit 1; }


# check next version
JSON_PATH="$PACKAGE_PATH/package.json"
test -f "$JSON_PATH" || { echo >&2 "Could not find $JSON_PATH"; exit 1; }

VERSION_NEXT=`git show $SOURCE_BRANCH:$JSON_PATH | underscore extract sencha.version --outfmt text`
echo "Package version in $SOURCE_BRANCH: $VERSION_NEXT"

git rev-parse -q --verify "refs/tags/v$VERSION_NEXT" >/dev/null && { echo >&2 "Tag v$VERSION_NEXT already exists"; exit 1; }


# check that builds branch doesn't have same version already, or create new builds branch
if git rev-parse -q --verify "$BUILD_BRANCH" ; then
    echo "Switching to existing build branch: $BUILD_BRANCH"
    git checkout $BUILD_BRANCH

    # fast forward build branch
    git pull --ff-only origin $BUILD_BRANCH >/dev/null 2>&1 || { echo >&2 "Could not fast-fwd $BUILD_BRANCH"; exit 1; }

    VERSION_LAST=`git show $BUILD_BRANCH:$JSON_PATH | underscore extract sencha.version --outfmt text`
    echo "Package version in $BUILD_BRANCH: $VERSION_LAST"

    test "$VERSION_LAST" != "$VERSION_NEXT" || { echo >&2 "Package version must be updated in $JSON_PATH"; exit 1; }
else
    echo "Creating build branch: $BUILD_BRANCH"
    git checkout -b $BUILD_BRANCH
fi


# build to branch
BUILD_HEAD=`git rev-parse $BUILD_BRANCH`
echo "Saving origin build branch head: $BUILD_HEAD"

echo "Merging source branch: $SOURCE_BRANCH"
git merge --quiet --no-edit -X theirs $SOURCE_BRANCH

BUILD_PATH="$PACKAGE_PATH/build"
if [ -d "$BUILD_PATH" ]; then
    echo "Clearing $BUILD_PATH"
    rm -R "$BUILD_PATH"
fi

mkdir "$BUILD_PATH"
BUILD_PATH=`cd "$BUILD_PATH"; pwd`

echo "Building package: $PACKAGE_PATH"
cd "$PACKAGE_PATH"

if sencha ant build ; then
    echo "Committing build"

    git add -f --all $BUILD_PATH
    git commit -m "Add build for v$VERSION_NEXT"

    echo "Creating release tag: v$VERSION_NEXT"
    git tag v$VERSION_NEXT

    echo "Returning to source branch"
    git checkout $SOURCE_BRANCH
else
    echo >&2 "Package build failed, restoring $BUILD_BRANCH and returning you to $SOURCE_BRANCH"
    git reset --hard $BUILD_HEAD
    git clean -df
    git checkout $SOURCE_BRANCH
    exit 1
fi