#!/usr/bin/bash
#
# This binary is made to be run by root, it expects a request from git server, deploy (install or update)
# the related tpm package and send a response to git server.

# Exit immediately if any command fails.
set -e

# Exit with the last non-zero fail code.
set -o pipefail

log() {
	echo -e "[DEPLOYER] $(date --rfc-3339=s) - $1"
}

fail () {
	if [ $# -eq 1 ]; then
		echo "$1" 1>&2
	fi
	exit 1
}

# Load config file.
[ $# -eq 1 ] || fail "Expecting 1 argument: config file."
source "$1"

# Check variables in config file.
[ -d "$REQUEST_DIR" ] || fail "Directory does not exist REQUEST_DIR=$REQUEST_DIR in config file $1."
[ -d "$RESPONSE_DIR" ] || fail "Directory does not exist RESPONSE_DIR=$RESPONSE_DIR in config file $1."
[ -d "$REPOS_DIR" ] || fail "Directory does not exist REPOS_DIR=$REPOS_DIR in config file $1."
[ -d "$RPMS_DIR" ] || fail "Directory does not exist RPMS_DIR=$RPMS_DIR in config file $1."
[ -z "$RPM_ARCH" ] && fail "Empty value RPM_ARCH in config file $1."
[ -z "$RPM_RELEASE" ] && fail "Empty value RPM_RELEASE in config file $1."
[ -z "$RPM_DIST" ] && fail "Empty value RPM_DIST in config file $1."

# First remove eventual old existing tmp files.
find "$REQUEST_DIR" -type f -delete
find "$RESPONSE_DIR" -type f -delete

# Loop on every created request.
while read _ _ repo_name; do

	log "New request detected for repo $repo_name."

	# Read request file and remove it immediately.
	repo_version=$(cat "$REQUEST_DIR/$repo_name")
	rm "$REQUEST_DIR/$repo_name"

	# Check repo version not empty.
	if [ -z "$repo_version" ]; then
		echo -e "Content of $REQUEST_DIR/$repo_name must contain repo version but is empty\n1" > "$RESPONSE_DIR/$repo_name"
		continue
	fi

	# Check if repo does exist.
	if [ ! -d "$REPOS_DIR/$repo_name.git" ]; then
		echo -e "Repository $REPOS_DIR/$repo_name.git does not exist!\n1" > "$RESPONSE_DIR/$repo_name"
		continue
	fi
		
	# Check if repo package is already exisitng.
	rpm_path="$RPMS_DIR/$RPM_ARCH/$repo_name-$repo_version-$RPM_RELEASE.$RPM_DIST.$RPM_ARCH.rpm"
	log "Using rpm package at $rpm_path."
	if [ ! -f "$rpm_path" ]; then
		echo -e "RPM package $rpm_path does not exist!\n1" > "$RESPONSE_DIR/$repo_name"
		continue
	fi

	# Upgrade package if already installed.
	if rpm -q "$repo_name" 1>/dev/null 2>/dev/null; then
		log "Upgrade package $repo_name to v$repo_version"
		output=$(rpm --upgrade --verbose --hash "$rpm_path" 2>&1) || exit_code=$?
		echo -e "$output\n$exit_code" > "$RESPONSE_DIR/$repo_name"
		continue
	fi

	# Install package if not already installed.
	log "Install package $repo_name v$repo_version."
	output=$(rpm --install --verbose --hash "$rpm_path" 2>&1) || exit_code=$?
       	echo -e "$output\n$exit_code" > "$RESPONSE_DIR/$repo_name"

done < <(inotifywait --monitor --event create "$REQUEST_DIR")