Adding new container top command.

Signed-off-by: Daniel Baumann <daniel.baumann@open-infrastructure.net>

1 files changed, 113 insertions, 0 deletions

diff --git a/lib/container/top b/lib/container/top
new file mode 100755
index 0000000..0ff1834
--- /dev/null
+++ b/lib/container/top
@@ -0,0 +1,113 @@
+#!/bin/sh
+
+# container-tools - Manage systemd-nspawn containers
+# Copyright (C) 2014-2017 Daniel Baumann <daniel.baumann@open-infrastructure.net>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set -e
+
+Parameters ()
+{
+	GETOPT_LONGOPTIONS="delay:,"
+	GETOPT_OPTIONS="d:,"
+
+	PARAMETERS="$(getopt --longoptions ${GETOPT_LONGOPTIONS} --name=${COMMAND} --options ${GETOPT_OPTIONS} --shell sh -- ${@})"
+
+	if [ "${?}" != "0" ]
+	then
+		echo "'${COMMAND}': getopt exit" >&2
+		exit 1
+	fi
+
+	eval set -- "${PARAMETERS}"
+
+	while true
+	do
+		case "${1}" in
+			-d|--delay)
+				DELAY="${2}"
+				shift 2
+				;;
+
+			--)
+				shift 1
+				break
+				;;
+
+			*)
+				echo "'${COMMAND}': getopt error" >&2
+				exit 1
+				;;
+		esac
+	done
+}
+
+Usage ()
+{
+	echo "Usage: container ${COMMAND} [-d|--delay DELAY]" >&2
+	exit 1
+}
+
+Parameters "${@}"
+
+DELAY="${DELAY:-1}"
+HOST="$(hostname -f)"
+
+# Pre hooks
+for FILE in "${HOOKS}/pre-${COMMAND}".* "${HOOKS}/${NAME}.pre-${COMMAND}"
+do
+	if [ -x "${FILE}" ]
+	then
+		"${FILE}"
+	fi
+done
+
+# Run
+Top ()
+{
+	HOME="$(tput cup 0 0)"
+	ED="$(tput ed)"
+	EL="$(tput el)"
+
+	printf '%s%s' "${HOME}" "${ED}"
+
+	while true
+	do
+		ROWS="$(tput lines)"
+		COLS="$(tput cols)"
+		CMD="${@}"
+
+		${SHELL:=sh} -c "${CMD}" | head -n ${ROWS} | while IFS= read LINE
+		do
+			printf '%-*.*s%s\n' ${COLS} ${COLS} "${LINE}" "${EL}"
+		done
+
+		printf '%s%s' "${ED}" "${HOME}"
+		sleep ${DELAY}
+	done
+}
+
+trap 'clear' EXIT HUP INT QUIT TERM
+
+Top "container list && printf '%-59s %-19s\n' \"  Host: ${HOST}\" \"\$(date +%Y-%m-%d\ %H:%M:%S)\""
+
+# Post hooks
+for FILE in "${HOOKS}/post-${COMMAND}".* "${HOOKS}/${NAME}.post-${COMMAND}"
+do
+	if [ -x "${FILE}" ]
+	then
+		"${FILE}"
+	fi
+done