#!/usr/bin/env bash
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set -o errexit #abort if any command fails
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me=$(basename "$0")
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help_message="\
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Usage: $me [-c FILE] [<options>]
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Deploy generated files to a git branch.
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Options:
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-h, --help Show this help information.
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-v, --verbose Increase verbosity. Useful for debugging.
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-e, --allow-empty Allow deployment of an empty directory.
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-m, --message MESSAGE Specify the message used when committing on the
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deploy branch.
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-n, --no-hash Don't append the source commit's hash to the deploy
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commit's message.
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"
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bundle exec middleman build --clean
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parse_args() {
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# Set args from a local environment file.
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if [ -e ".env" ]; then
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source .env
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fi
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# Parse arg flags
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# If something is exposed as an environment variable, set/overwrite it
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# here. Otherwise, set/overwrite the internal variable instead.
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while : ; do
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if [[ $1 = "-h" || $1 = "--help" ]]; then
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echo "$help_message"
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return 0
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elif [[ $1 = "-v" || $1 = "--verbose" ]]; then
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verbose=true
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shift
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elif [[ $1 = "-e" || $1 = "--allow-empty" ]]; then
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allow_empty=true
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shift
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elif [[ ( $1 = "-m" || $1 = "--message" ) && -n $2 ]]; then
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commit_message=$2
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shift 2
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elif [[ $1 = "-n" || $1 = "--no-hash" ]]; then
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GIT_DEPLOY_APPEND_HASH=false
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shift
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else
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break
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fi
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done
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# Set internal option vars from the environment and arg flags. All internal
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# vars should be declared here, with sane defaults if applicable.
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# Source directory & target branch.
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deploy_directory=build
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deploy_branch=gh-pages
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#if no user identity is already set in the current git environment, use this:
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default_username=${GIT_DEPLOY_USERNAME:-deploy.sh}
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default_email=${GIT_DEPLOY_EMAIL:-}
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#repository to deploy to. must be readable and writable.
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repo=origin
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#append commit hash to the end of message by default
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append_hash=${GIT_DEPLOY_APPEND_HASH:-true}
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}
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main() {
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parse_args "$@"
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enable_expanded_output
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if ! git diff --exit-code --quiet --cached; then
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echo Aborting due to uncommitted changes in the index >&2
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return 1
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fi
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commit_title=`git log -n 1 --format="%s" HEAD`
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commit_hash=` git log -n 1 --format="%H" HEAD`
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#default commit message uses last title if a custom one is not supplied
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if [[ -z $commit_message ]]; then
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commit_message="publish: $commit_title"
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fi
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#append hash to commit message unless no hash flag was found
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if [ $append_hash = true ]; then
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commit_message="$commit_message"$'\n\n'"generated from commit $commit_hash"
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fi
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previous_branch=`git rev-parse --abbrev-ref HEAD`
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if [ ! -d "$deploy_directory" ]; then
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echo "Deploy directory '$deploy_directory' does not exist. Aborting." >&2
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return 1
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fi
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# must use short form of flag in ls for compatibility with OS X and BSD
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if [[ -z `ls -A "$deploy_directory" 2> /dev/null` && -z $allow_empty ]]; then
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echo "Deploy directory '$deploy_directory' is empty. Aborting. If you're sure you want to deploy an empty tree, use the --allow-empty / -e flag." >&2
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return 1
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fi
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if git ls-remote --exit-code $repo "refs/heads/$deploy_branch" ; then
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# deploy_branch exists in $repo; make sure we have the latest version
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disable_expanded_output
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git fetch --force $repo $deploy_branch:$deploy_branch
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enable_expanded_output
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fi
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# check if deploy_branch exists locally
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if git show-ref --verify --quiet "refs/heads/$deploy_branch"
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then incremental_deploy
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else initial_deploy
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fi
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restore_head
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}
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initial_deploy() {
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git --work-tree "$deploy_directory" checkout --orphan $deploy_branch
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git --work-tree "$deploy_directory" add --all
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commit+push
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}
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incremental_deploy() {
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#make deploy_branch the current branch
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git symbolic-ref HEAD refs/heads/$deploy_branch
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#put the previously committed contents of deploy_branch into the index
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git --work-tree "$deploy_directory" reset --mixed --quiet
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git --work-tree "$deploy_directory" add --all
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set +o errexit
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diff=$(git --work-tree "$deploy_directory" diff --exit-code --quiet HEAD --)$?
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set -o errexit
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case $diff in
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0) echo No changes to files in $deploy_directory. Skipping commit.;;
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1) commit+push;;
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*)
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echo git diff exited with code $diff. Aborting. Staying on branch $deploy_branch so you can debug. To switch back to master, use: git symbolic-ref HEAD refs/heads/master && git reset --mixed >&2
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return $diff
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;;
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esac
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}
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commit+push() {
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set_user_id
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git --work-tree "$deploy_directory" commit -m "$commit_message"
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disable_expanded_output
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#--quiet is important here to avoid outputting the repo URL, which may contain a secret token
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git push --quiet $repo $deploy_branch
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enable_expanded_output
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}
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#echo expanded commands as they are executed (for debugging)
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enable_expanded_output() {
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if [ $verbose ]; then
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set -o xtrace
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set +o verbose
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fi
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}
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#this is used to avoid outputting the repo URL, which may contain a secret token
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disable_expanded_output() {
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if [ $verbose ]; then
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set +o xtrace
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set -o verbose
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fi
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}
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set_user_id() {
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if [[ -z `git config user.name` ]]; then
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git config user.name "$default_username"
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fi
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if [[ -z `git config user.email` ]]; then
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git config user.email "$default_email"
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fi
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}
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restore_head() {
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if [[ $previous_branch = "HEAD" ]]; then
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#we weren't on any branch before, so just set HEAD back to the commit it was on
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git update-ref --no-deref HEAD $commit_hash $deploy_branch
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else
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git symbolic-ref HEAD refs/heads/$previous_branch
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fi
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git reset --mixed
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}
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filter() {
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sed -e "s|$repo|\$repo|g"
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}
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sanitize() {
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"$@" 2> >(filter 1>&2) | filter
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}
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[[ $1 = --source-only ]] || main "$@"
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