trigger-deploy

#!/bin/bash

# Pull changes from a remote repository and deploy them.
#

set -e
set -x

. "$(dirname $(readlink -f $0))/functions.sh"

if [ "$1" = "-v" ]; then
	VERBOSE="y"
	shift
fi

v() {
	if [ "$VERBOSE" = "y" ]; then
		echo "$1" >&2
	fi
}

vercmp() {
	local n1="${1}[@]"
	local n2="${2}[@]"
	local v1=(${!n1})
	local v2=(${!n2})

	if [[ ${#v1[@]} < ${#v2[@]} ]]; then
		local len=${#v2[@]}
	else
		local len=${#v1[@]}
	fi

	for i in $(seq 1 $len); do
		local cmp1="${v1[$i]}"
		local cmp2="${v2[$i]}"

		if [ -z "$cmp1" ]; then
			cmp1="0"
		fi
		if [ -z "$cmp2" ]; then
			cmp2="0"
		fi

		if [[ "$cmp1" < "$cmp2" ]]; then
			echo "${v2[0]}"
			return 0
		elif [[ "${v1[$i]}" > "${v2[$i]}" ]]; then
			echo "${v1[0]}"
			return 0
		fi
	done
}

ROOT="$1"

if ! [[ "$ROOT" =~ ^/ ]]; then
	# Relative path given; lets get some homedir
	HOMEDIR="$(getent passwd $(whoami) | cut -d : -f 6)"
	ROOT="${HOMEDIR}/${ROOT}"
fi

REPO="${ROOT}/repo"

v "Repository is '${REPO}'"

# Git-specific stuff starts here
get_config() {
	local option="$1"

	git config --file "${REPO}/config" --get giddyup.${option} || true
}

if [ "$(get_config debug)" = "true" ]; then
	set -x
fi

if [ "$VERBOSE" = "y" ]; then
	ORIGIN="$(git --git-dir "${REPO}" remote -v |
	            grep ^origin | grep '\(fetch\)' |
	            cut -f 2 | cut -d ' ' -f 1)"

	echo "Origin is '${ORIGIN}'"
fi

git --git-dir "${REPO}" fetch origin

tagregex="$(get_config tagRegex)"

if [ -z "$tagregex" ]; then
	v "No tagRegex set; tracking HEAD"
	REF="FETCH_HEAD"
else
	v "tagRegex is '${tagregex}'"
	REF=""
	while read tag; do
		if ! [[ "$tag" =~ $tagregex ]]; then
			v "$tag doesn't match tagregex"
			continue
		fi

		if [ -z "$REF" ]; then
			REF="$tag"
			v "First matching tag is ${REF}"
			continue
		fi

		this_tag_parts=(${BASH_REMATCH[@]})
		this_tag_parts[0]="$tag"

		[[ "$REF" =~ $tagregex ]] || true
		ref_tag_parts=(${BASH_REMATCH[@]})
		ref_tag_parts[0]="$REF"

		REF="$(vercmp this_tag_parts ref_tag_parts)"
		v "REF is now ${REF}"
	done < <(git --git-dir="$REPO" tag)

	v "Best matching tag is ${REF}"
	if [ -z "$REF" ]; then
		echo "No tag found matching '${tagregex}'; deploy failed"
		exit 1
	fi
fi

if [ "$(basename $0)" = "check-deploy" ]; then
	SHA="$(git --git-dir "${REPO}" rev-parse "$REF")"
	CUR="$(cat "${ROOT}/current/REVISION" || true 2>/dev/null)"

	if [ "$SHA" = "$CUR" ]; then
		v "Deployment is up-to-date"
		exit 0
	else
		v "Deployment is out-of-date"
		exit 1
	fi
fi

init_env

cd "${RELEASE}"

echo "$(git --git-dir "${REPO}" rev-parse "$REF")" >./REVISION
git --git-dir "${REPO}" archive --format=tar "$REF" | tar xf -

cd "${ROOT}"

# End git-specific stuff

cycle_release