[__single_binary_service] Many improvements + runit support

Amongst other things compressed files can be of a type other than .tar.gz (it
remains the default) and we now properly support runit services, FreeBSD and
Devuan.

gencode-remote

@@ -1,21 +0,0 @@
-#!/bin/sh -e
-
-STATE="$(cat "${__object}/parameter/state")"
-if [ "${STATE}" != "present" ]; then
-	exit
-fi
-
-ETC_DIR="/etc"
-SERVICE_NAME="${__object_id}"
-CONFIG_FILE_DEST="${ETC_DIR}/${SERVICE_NAME}.conf"
-
-BIN_DIR="/usr/local/bin"
-VERSION_FILE="${BIN_DIR}/.${SERVICE_NAME}.cdist.version"
-
-# We only restart here if there was a config change
-# but there was not a version change
-if grep -qE "^__file${CONFIG_FILE_DEST}" "${__messages_in}" && \
-	grep -qvE "^__file${VERSION_FILE}" "${__messages_in}"; then
-	echo "service ${SERVICE_NAME} restart"
-fi
-

man.rst

@@ -23,10 +23,8 @@ binaries in `/usr/local/bin`.
 If a `--config-file-source` is provided, it will be placed under:
 `/etc/${__object_id}.conf`.
 
-TODO (patches welcome!):
-- It currently only supports `.tar.gz` archives.
-- It currently only supports systemd units.
-- Does not handle properly BSD-systems (wheel group, /usr/local/etc, systemd)
+This type supports services managed by `__runit(7)` when `systemd` is not
+the init system being used.
 
 
 REQUIRED PARAMETERS
@@ -72,6 +70,13 @@ user
     If this user is not `root` and `--do-not-manage-user` is not present,
     this user will be created or removed as per the `--state` parameter.
 
+user-home-dir
+    Does not have an effect if `--do-not-manage-user` is used or `--user` is
+    `root`.
+    The home directory of the service user. It will be created.
+    Defaults to `/nonexistent`, in this case the home directory will not be
+    created.
+
 group
     The group under which the service will run. Defaults to `--user`.
 
@@ -95,6 +100,13 @@ service-exec
     Defaults to `/usr/local/bin/BINARY_NAME` where `BINARY_NAME` is the
     resulting value of `--binary`.
 
+service-definition
+    The service definition to be used as an override.
+    Note that this type decides dinammically between runit and systemd, and
+    you can currently only define either a systemd unit or a runit script here.
+    Use this parameter only for testing and get in touch to discuss how your
+    particular use-case can be supported by the type.
+
 service-description
     The service description to be used in, e.g. the systemd unit file.
     Defaults to `cdist-managed '${__object_id}' service`.
@@ -106,6 +118,13 @@ unpack-args
     subdirectories; that can be worked around with
     `--unpack-args '--tar-strip 1'`.
 
+unpack-extension
+    Only has an effect if `--unpack` is used.
+    The file extension of the file to unpack, defaults to `.tar.gz`.
+
+working-directory
+    If set, the working directory with which the service will be started.
+
 
 OPTIONAL MULTIPLE PARAMETERS
 ----------------------------

manifest

@@ -1,22 +1,43 @@
 #!/bin/sh -e
+SERVICE_NAME="${__object_id}"
 
 OS="$(cat "${__global}/explorer/os")"
 
 case "${OS}" in
-  debian)
+	debian|devuan)
 		SUPER_USER_GROUP=root
+		ETC_DIR="/etc"
 	;;
 	*bsd)
 		SUPER_USER_GROUP=wheel
+		ETC_DIR="/usr/local/etc"
 	;;
 	*)
 		echo "Your OS '${OS}' is currently not supported." >&2
 		exit 1
 	;;
 esac
+INIT="$(cat "${__global}/explorer/init")"
+
+case "${INIT}" in
+	systemd)
+		service_definition_require="__systemd_unit/${SERVICE_NAME}.service"
+		service_command="service ${SERVICE_NAME} %s"
+	;;
+	runit|sysvinit)
+		# We will use runit to manage these services
+		__runit
+		export require="__runit"
+		service_definition_require="__runit_service/${SERVICE_NAME}"
+		service_command="sv %s ${SERVICE_NAME}"
+	;;
+	*)
+		echo "Init system ${INIT}' is currently not supported." >&2
+		exit 1
+	;;
+esac
 
 BIN_DIR="/usr/local/bin"
-ETC_DIR="/etc"
 
 # Ensure the target bin dir exists
 #   Care, we never want to remove it :-D
@@ -29,10 +50,13 @@ STATE="$(cat "${__object}/parameter/state")"
 USER="$(cat "${__object}/parameter/user")"
 GROUP="$(cat "${__object}/parameter/group" 2>/dev/null || true)"
 if [ -z "${GROUP}" ]; then
+	if [ "${USER}" != "root" ]; then
 		GROUP="${USER}"
+	else
+		GROUP="${SUPER_USER_GROUP}"
+	fi
 fi
 
-SERVICE_NAME="${__object_id}"
 
 BINARY="$(cat "${__object}/parameter/binary" 2>/dev/null || true)"
 if [ -z "${BINARY}" ]; then
@@ -62,22 +86,34 @@ fi
 
 SERVICE_DEFINITION="$(cat "${__object}/parameter/service-definition" 2>/dev/null || true)"
 
+WORKING_DIRECTORY_PATH="$(cat "${__object}/parameter/working-directory" 2>/dev/null || true)"
+if [ -n "${WORKING_DIRECTORY_PATH}" ]; then
+	WORKING_DIRECTORY_SYSTEMD="WorkingDirectory=${WORKING_DIRECTORY_PATH}"
+	WORKING_DIRECTORY_RUNIT="cd '${WORKING_DIRECTORY_PATH}'"
+fi
+
 DOWNLOAD_URL="$(cat "${__object}/parameter/url")"
 CHECKSUM="$(cat "${__object}/parameter/checksum")"
 SHOULD_VERSION="$(cat "${__object}/parameter/version")"
 
 # Create a user for the service if it is not root
+USER_HOME_DIR="/root"
 if [ "${USER}" != "root" ] && \
 		[ ! -f "${__object}/parameter/do-not-manage-user" ]; then
 	if [ "${STATE}" = "absent" ]; then
 		# When removing, ensure user is not being used
-		user_require="__systemd_unit/${SERVICE_NAME}.service"
+		user_require="${service_definition_require}"
+	fi
+	USER_HOME_DIR="$(cat "${__object}/parameter/user-home-dir")"
+	if [ "${USER_HOME_DIR}" != "/nonexistent" ]; then
+		USER_CREATE_HOME="--create-home"
 	fi
 	require="${require} ${user_require}" __user "${USER}" \
 		--system \
 		--state "${STATE}" \
-		--home /nonexistent \
-		--comment "cdist-managed ${SERVICE_NAME} user"
+		--home "${USER_HOME_DIR}" \
+		--comment "cdist-managed ${SERVICE_NAME} user" \
+		${USER_CREATE_HOME}
 	# Track dependencies
 	service_require="${service_require} __user/${USER}"
 fi
@@ -100,8 +136,8 @@ fi
 
 
 
-INIT="$(cat "${__global}/explorer/init")"
-# TODO: Support non-systemd
+# This should setup the object in $service_definition_require
+# See above.
 case "${INIT}" in
 	systemd)
 		if [ -z "${SERVICE_DEFINITION}" ]; then
@@ -117,6 +153,7 @@ User=${USER}
 Group=${GROUP}
 ExecStart=${SERVICE_EXEC}
 Restart=always
+${WORKING_DIRECTORY_SYSTEMD}
 
 [Install]
 WantedBy=multi-user.target
@@ -129,14 +166,28 @@ EOF
 			--enablement-state "enabled" <<EOF
 ${SERVICE_DEFINITION}
 EOF
-	service_require="${service_require} __systemd_unit/${SERVICE_NAME}.service"
-
 	;;
-  *)
-    echo "Init system ${INIT}' is currently not supported." >&2
-    exit 1
+	runit|sysvinit)
+		if [ -z "${SERVICE_DEFINITION}" ]; then
+			SERVICE_DEFINITION="$(cat <<EOF
+#!/bin/sh -e
+${WORKING_DIRECTORY_RUNIT}
+export HOME="\$(getent passwd '${USER}' | cut -d: -f6)"
+export USER="${USER}"
+export GROUP="${GROUP}"
+exec chpst -u "${USER}:${GROUP}" ${SERVICE_EXEC}
+EOF
+)"
+		fi
+		__runit_service "${SERVICE_NAME}" \
+			--state "${STATE}" \
+			--log \
+			--source - <<EOF
+${SERVICE_DEFINITION}
+EOF
 	;;
 esac
+service_require="${service_require} ${service_definition_require}"
 
 # Proceed after user and service description have been prepared
 export require="${require} ${service_require}"
@@ -144,8 +195,27 @@ export require="${require} ${service_require}"
 VERSION_FILE="${BIN_DIR}/.${SERVICE_NAME}.cdist.version"
 IS_VERSION="$(cat "${__object}/explorer/explorer-version")"
 
-if [ "${SHOULD_VERSION}" != "${IS_VERSION}" ] && \
-		[ "${STATE}" = "present" ]; then
+
+if [ "${STATE}" = "absent" ]; then
+	# Perform cleanup of generated files
+	for bin_file in ${BINARY} ${EXTRA_BINARIES}; do
+		__file "${BIN_DIR}/${bin_file}" --state "absent"
+	done
+	__file "${VERSION_FILE}" --state "absent"
+	__file "${CONFIG_FILE_DEST}" --state "absent"
+fi
+
+if [ "${STATE}" != "present" ]; then
+	exit
+fi
+
+sv_cmd() {
+	# This is intentional
+	# shellcheck disable=SC2059
+	printf "${service_command}" "$1"
+}
+
+if [ "${SHOULD_VERSION}" != "${IS_VERSION}" ]; then
 	# We are installing the service and there has been a version change
 	# (or it is first-time install)
 	TMP_PATH="/tmp/${SERVICE_NAME}-${SHOULD_VERSION}"
@@ -153,34 +223,40 @@ if [ "${SHOULD_VERSION}" != "${IS_VERSION}" ] && \
 	# This is what will stop the service, replace the binaries and
 	# start the service again
 	perform_service_upgrade="$(cat <<EOF
-service ${SERVICE_NAME} stop || true
-for bin_file in ${BINARY} ${EXTRA_BINARIES}; do
+$(sv_cmd stop) || true
+if [ -f '${TMP_PATH}' ]; then
+	chown root:${SUPER_USER_GROUP} '${TMP_PATH}'
+	chmod 0555 '${TMP_PATH}'
+	cp -af '${TMP_PATH}' '${BIN_DIR}/${BINARY}'
+else
+	for bin_file in ${BINARY} ${EXTRA_BINARIES}; do
 		bin_path="${TMP_PATH}/\${bin_file}"
 		chown root:${SUPER_USER_GROUP} "\${bin_path}"
 		chmod 0555 "\${bin_path}"
 		cp -af "\${bin_path}" "${BIN_DIR}/\${bin_file}"
-done
-service ${SERVICE_NAME} start || true
+	done
+fi
+$(sv_cmd start) || true
 EOF
 )"
 
 	if [ -f "${__object}/parameter/unpack" ]; then
-		# TODO: Support files other than .tar.gz
+		UNPACK_EXTENSION="$(cat "${__object}/parameter/unpack-extension")"
 		UNPACK_ARGS="$(cat "${__object}/parameter/unpack-args" \
 			2>/dev/null || true)"
 		# Download packed file
-		__download "${TMP_PATH}.tar.gz" \
+		__download "${TMP_PATH}${UNPACK_EXTENSION}" \
 			--url "${DOWNLOAD_URL}" \
 			--download remote \
 			--sum "${CHECKSUM}"
 
 		# Unpack file and also perform service upgrade
 		# shellcheck disable=SC2086
-		require="__download${TMP_PATH}.tar.gz" \
-			__unpack "${TMP_PATH}.tar.gz" \
+		require="__download${TMP_PATH}${UNPACK_EXTENSION}" \
+			__unpack "${TMP_PATH}${UNPACK_EXTENSION}" \
 			${UNPACK_ARGS} \
 			--destination "${TMP_PATH}"
-		version_bump_require="__unpack${TMP_PATH}.tar.gz"
+		version_bump_require="__unpack${TMP_PATH}${UNPACK_EXTENSION}"
 	else
 		# Create temp directory
 		__directory "${TMP_PATH}"
@@ -196,18 +272,17 @@ EOF
 
 	# Perform update of cdist-managed version file
 	# And also perform service upgrade
+	# This is a bug if service_upgrade fails >,<
 	printf "%s" "${SHOULD_VERSION}" | \
 		require="${version_bump_require}" __file \
 			"${VERSION_FILE}" \
 			--onchange "${perform_service_upgrade}" \
 			--source "-"
-fi
-
-if [ "${STATE}" = "absent" ]; then
-	# Perform cleanup of generated files
-	for bin_file in ${BINARY} ${EXTRA_BINARIES}; do
-		__file "${BIN_DIR}/${bin_file}" --state "absent"
-	done
-	__file "${VERSION_FILE}" --state "absent"
-	__file "${CONFIG_FILE_DEST}" --state "absent"
+else
+	# We only restart here if there was a config change
+	# but there was not a version change
+	require="${service_require}" __check_messages \
+		"single_binary_service_${__object_id}" \
+		--pattern "^__file${CONFIG_FILE_DEST}" \
+		--execute "$(sv_cmd restart)"
 fi

parameter/default/unpack-extension

@@ -0,0 +1 @@
+.tar.gz

parameter/default/user-home-dir

@@ -0,0 +1 @@
+/nonexistent

parameter/optional

@@ -7,4 +7,7 @@ service-args
 service-exec
 service-description
 service-definition
+unpack-extension
 unpack-args
+user-home-dir
+working-directory