Adding container enter command.

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

4 files changed, 178 insertions, 0 deletions

diff --git a/lib/container/enter b/lib/container/enter
new file mode 100755
index 0000000..0de88da
--- /dev/null
+++ b/lib/container/enter
@@ -0,0 +1,97 @@
+#!/bin/sh
+
+# container-tools - Manage systemd-nspawn containers
+# Copyright (C) 2014-2016 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
+
+COMMAND="$(basename ${0})"
+
+MACHINES="/var/lib/machines"
+
+Parameters ()
+{
+	LONG_OPTIONS="name:,"
+
+	OPTIONS="n:"
+
+	PARAMETERS="$(getopt --longoptions ${LONG_OPTIONS} --name=${COMMAND} --options ${OPTIONS} --shell sh -- ${@})"
+
+	if [ "${?}" != "0" ]
+	then
+		echo "'${COMMAND}': getopt exit" >&2
+		exit 1
+	fi
+
+	eval set -- "${PARAMETERS}"
+
+	while true
+	do
+		case "${1}" in
+			-n|--name)
+				NAME="${2}"
+				shift 2
+				;;
+
+			--)
+				shift 1
+				break
+				;;
+
+			*)
+				echo "'${COMMAND}': getopt error" >&2
+				exit 1
+				;;
+		esac
+	done
+}
+
+Usage ()
+{
+	echo "Usage: container ${COMMAND} -n|--name NAME [-- COMMAND|\"COMMANDS\"]" >&2
+	exit 1
+}
+
+Parameters "${@}"
+
+if [ -z "${NAME}" ]
+then
+	Usage
+fi
+
+if [ ! -e "${MACHINES}/${NAME}" ]
+then
+	echo "'${NAME}': no such container" >&2
+	exit 1
+fi
+
+STATE="$(machinectl show ${NAME} 2>&1 | awk -F= '/^State=/ { print $2 }')"
+
+case "${STATE}" in
+	running)
+		;;
+
+	*)
+		echo "'${NAME}': container is not running" >&2
+		exit 1
+		;;
+esac
+
+LEADER="$(machinectl status ${NAME} | awk '/Leader: / { print $2 }')"
+COMMANDS="$(echo ${@} | sed -e 's|.*-- ||')"
+
+# Run
+nsenter --target ${LEADER} --mount --uts --ipc --net --pid --root --wd=/root ${COMMANDS}
diff --git a/share/man/container-enter.1.txt b/share/man/container-enter.1.txt
new file mode 100644
index 0000000..2c93e8d
--- /dev/null
+++ b/share/man/container-enter.1.txt
@@ -0,0 +1,75 @@
+// container-tools - Manage systemd-nspawn containers
+// Copyright (C) 2014-2016 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/>.
+
+CONTAINER-CONSOLE(1)
+====================
+:doctype: manpage
+:man manual: Open Infrastructure
+:man source: container-tools
+:man version: {revnumber}
+
+
+NAME
+----
+container-enter - Enter a container namespace
+
+
+SYNOPSIS
+--------
+*container enter* ['OPTIONS'] [-- COMMAND|"COMMANDS"]
+
+
+DESCRIPTION
+-----------
+The container enter enters a container namespace.
+
+
+OPTIONS
+-------
+The following container options are available:
+
+*-n, --name='NAME'*::
+	Specify container name.
+
+
+EXAMPLES
+--------
+*Enter to example.net container namespace:*::
+	sudo container enter -n example.net
+
+*Execute 'ip a' in example.net container namespace:*::
+	sudo container enter -n example.net -- 'ip a'
+
+
+SEE ALSO
+--------
+container-tools(7),
+container(1).
+
+
+HOMEPAGE
+--------
+More information about container-tools and the Open Infrastructure project can be found on the homepage at https://open-infrastructure.net.
+
+
+BUGS
+----
+Bugs can be reported by opening an issue in the GitHub repository at https://github.com/open-infrastructure/container-tools.
+
+
+AUTHORS
+-------
+container-tools was written by Daniel Baumann <daniel.baumann@open-infrastructure.net>.
diff --git a/share/man/container-tools.7.txt b/share/man/container-tools.7.txt
index 95d09c8..cdadbb4 100644
--- a/share/man/container-tools.7.txt
+++ b/share/man/container-tools.7.txt
@@ -93,6 +93,9 @@ USAGE
 *Attach console to a container:*::
 	sudo container console -n NAME
 
+*Enter a container namespace:*::
+	sudo container enter -n NAME
+
 *limit*::
 	sudo container limit -n NAME --cpu-quota 10%
 
diff --git a/share/man/container.1.txt b/share/man/container.1.txt
index 7ad4f87..6fac812 100644
--- a/share/man/container.1.txt
+++ b/share/man/container.1.txt
@@ -67,6 +67,9 @@ The following container commands are available:
 *console*::
 	Attach console to a container, see container-console(1).
 
+*enter*::
+	Enter a container namespace, see container-enter(1).
+
 *limit*::
 	Limit ressources of a container, see container-limit(1).