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Copy pathdeploy.sh
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executable file
·226 lines (187 loc) · 6.12 KB
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#!/usr/bin/env bash
set -o errexit #abort if any command fails
me=$(basename "$0")
help_message="\
Usage: $me [-c FILE] [<options>]
Deploy generated files to a git branch.
Options:
-h, --help Show this help information.
-v, --verbose Increase verbosity. Useful for debugging.
-e, --allow-empty Allow deployment of an empty directory.
-m, --message MESSAGE Specify the message used when committing on the
deploy branch.
-n, --no-hash Don't append the source commit's hash to the deploy
commit's message.
--source-only Only build but not push
--push-only Only push but not build
"
run_build() {
bundle exec middleman build --clean
}
parse_args() {
# Set args from a local environment file.
if [ -e ".env" ]; then
source .env
fi
# Parse arg flags
# If something is exposed as an environment variable, set/overwrite it
# here. Otherwise, set/overwrite the internal variable instead.
while : ; do
if [[ $1 = "-h" || $1 = "--help" ]]; then
echo "$help_message"
exit 0
elif [[ $1 = "-v" || $1 = "--verbose" ]]; then
verbose=true
shift
elif [[ $1 = "-e" || $1 = "--allow-empty" ]]; then
allow_empty=true
shift
elif [[ ( $1 = "-m" || $1 = "--message" ) && -n $2 ]]; then
commit_message=$2
shift 2
elif [[ $1 = "-n" || $1 = "--no-hash" ]]; then
GIT_DEPLOY_APPEND_HASH=false
shift
elif [[ $1 = "--source-only" ]]; then
source_only=true
shift
elif [[ $1 = "--push-only" ]]; then
push_only=true
shift
else
break
fi
done
if [ ${source_only} ] && [ ${push_only} ]; then
>&2 echo "You can only specify one of --source-only or --push-only"
exit 1
fi
# Set internal option vars from the environment and arg flags. All internal
# vars should be declared here, with sane defaults if applicable.
# Source directory & target branch.
deploy_directory=build
deploy_branch=gh-pages
#if no user identity is already set in the current git environment, use this:
default_username=${GIT_DEPLOY_USERNAME:-deploy.sh}
default_email=${GIT_DEPLOY_EMAIL:-}
#repository to deploy to. must be readable and writable.
repo=origin
#append commit hash to the end of message by default
append_hash=${GIT_DEPLOY_APPEND_HASH:-true}
}
main() {
enable_expanded_output
if ! git diff --exit-code --quiet --cached; then
echo Aborting due to uncommitted changes in the index >&2
return 1
fi
commit_title=`git log -n 1 --format="%s" HEAD`
commit_hash=` git log -n 1 --format="%H" HEAD`
#default commit message uses last title if a custom one is not supplied
if [[ -z $commit_message ]]; then
commit_message="publish: $commit_title"
fi
#append hash to commit message unless no hash flag was found
if [ $append_hash = true ]; then
commit_message="$commit_message"$'\n\n'"generated from commit $commit_hash"
fi
previous_branch=`git rev-parse --abbrev-ref HEAD`
if [ ! -d "$deploy_directory" ]; then
echo "Deploy directory '$deploy_directory' does not exist. Aborting." >&2
return 1
fi
# must use short form of flag in ls for compatibility with macOS and BSD
if [[ -z `ls -A "$deploy_directory" 2> /dev/null` && -z $allow_empty ]]; then
echo "Deploy directory '$deploy_directory' is empty. Aborting. If you're sure you want to deploy an empty tree, use the --allow-empty / -e flag." >&2
return 1
fi
if git ls-remote --exit-code $repo "refs/heads/$deploy_branch" ; then
# deploy_branch exists in $repo; make sure we have the latest version
disable_expanded_output
git fetch --force $repo $deploy_branch:$deploy_branch
enable_expanded_output
fi
# check if deploy_branch exists locally
if git show-ref --verify --quiet "refs/heads/$deploy_branch"
then incremental_deploy
else initial_deploy
fi
restore_head
}
initial_deploy() {
git --work-tree "$deploy_directory" checkout --orphan $deploy_branch
git --work-tree "$deploy_directory" add --all
commit+push
}
incremental_deploy() {
#make deploy_branch the current branch
git symbolic-ref HEAD refs/heads/$deploy_branch
#put the previously committed contents of deploy_branch into the index
git --work-tree "$deploy_directory" reset --mixed --quiet
git --work-tree "$deploy_directory" add --all
set +o errexit
diff=$(git --work-tree "$deploy_directory" diff --exit-code --quiet HEAD --)$?
set -o errexit
case $diff in
0) echo No changes to files in $deploy_directory. Skipping commit.;;
1) commit+push;;
*)
echo git diff exited with code $diff. Aborting. Staying on branch $deploy_branch so you can debug. To switch back to main, use: git symbolic-ref HEAD refs/heads/main && git reset --mixed >&2
return $diff
;;
esac
}
commit+push() {
set_user_id
git --work-tree "$deploy_directory" commit -m "$commit_message"
disable_expanded_output
#--quiet is important here to avoid outputting the repo URL, which may contain a secret token
git push --quiet $repo $deploy_branch
enable_expanded_output
}
#echo expanded commands as they are executed (for debugging)
enable_expanded_output() {
if [ $verbose ]; then
set -o xtrace
set +o verbose
fi
}
#this is used to avoid outputting the repo URL, which may contain a secret token
disable_expanded_output() {
if [ $verbose ]; then
set +o xtrace
set -o verbose
fi
}
set_user_id() {
if [[ -z `git config user.name` ]]; then
git config user.name "$default_username"
fi
if [[ -z `git config user.email` ]]; then
git config user.email "$default_email"
fi
}
restore_head() {
if [[ $previous_branch = "HEAD" ]]; then
#we weren't on any branch before, so just set HEAD back to the commit it was on
git update-ref --no-deref HEAD $commit_hash $deploy_branch
else
git symbolic-ref HEAD refs/heads/$previous_branch
fi
git reset --mixed
}
filter() {
sed -e "s|$repo|\$repo|g"
}
sanitize() {
"$@" 2> >(filter 1>&2) | filter
}
parse_args "$@"
if [[ ${source_only} ]]; then
run_build
elif [[ ${push_only} ]]; then
main "$@"
else
run_build
main "$@"
fi