Adding container run command to execute programs within containers.

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

3 files changed, 210 insertions, 0 deletions

diff --git a/lib/container/run b/lib/container/run
new file mode 100755
index 0000000..f6323c0
--- /dev/null
+++ b/lib/container/run
@@ -0,0 +1,127 @@
+#!/bin/sh
+
+# Copyright (C) 2014-2019 Daniel Baumann <daniel.baumann@open-infrastructure.net>
+#
+# SPDX-License-Identifier: GPL-3.0+
+#
+# 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
+
+PROJECT="open-infrastructure"
+PROGRAM="container"
+COMMAND="$(basename ${0})"
+
+HOOKS="/etc/${PROJECT}/${PROGRAM}/hooks"
+MACHINES="/var/lib/machines"
+
+Parameters ()
+{
+	GETOPT_LONGOPTIONS="name:,"
+	GETOPT_OPTIONS="n:,"
+
+	PARAMETERS="$(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 "${1}" in
+			-n|--name)
+				NAME="${2}"
+				shift 2
+				;;
+
+			--)
+				shift 1
+				break
+				;;
+
+			*)
+				echo "'${COMMAND}': getopt error" >&2
+				exit 1
+				;;
+		esac
+	done
+}
+
+Usage ()
+{
+	echo "Usage: ${PROGRAM} ${COMMAND} -n|--name NAME -- COMMAND" >&2
+	exit 1
+}
+
+Parameters "${@}"
+
+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 $2 }')"
+
+# Pre hooks
+for FILE in "${HOOKS}/pre-${COMMAND}".* "${HOOKS}/${NAME}.pre-${COMMAND}"
+do
+	if [ -x "${FILE}" ]
+	then
+		"${FILE}"
+	fi
+done
+
+SSH_CLIENT="${SSH_CLIENT:-127.0.0.1 0 0}"
+
+RUN="$(echo ${@} | awk -F-- '{ print $2}')"
+
+# Run
+nsenter --all --target "${LEADER}" --wd="${MACHINES}/${NAME}/root" /usr/bin/script -c "LC_ALL=C.UTF-8 /bin/bash -l -c \"${RUN}\"" -q /dev/null
+
+case "${SSH_CLIENT}" in
+	127.0.0.1*)
+		unset SSH_CLIENT
+		;;
+esac
+
+# Post hooks
+for FILE in "${HOOKS}/post-${COMMAND}".* "${HOOKS}/${NAME}.post-${COMMAND}"
+do
+	if [ -x "${FILE}" ]
+	then
+		"${FILE}"
+	fi
+done
diff --git a/share/man/container-run.1.txt b/share/man/container-run.1.txt
new file mode 100644
index 0000000..8a713a5
--- /dev/null
+++ b/share/man/container-run.1.txt
@@ -0,0 +1,80 @@
+// Copyright (C) 2014-2020 Daniel Baumann <daniel.baumann@open-infrastructure.net>
+//
+// SPDX-License-Identifier: GPL-3.0+
+//
+// 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-RUN(1)
+================
+:doctype: manpage
+:man manual: Open Infrastructure
+:man source: compute-tools
+:man version: {revnumber}
+
+
+NAME
+----
+container-run - Execute commands in a container namespace
+
+
+SYNOPSIS
+--------
+*container run* ['OPTIONS'] -- COMMAND
+*cnt r* ['OPTIONS'] -- COMMAND
+
+
+DESCRIPTION
+-----------
+The container run command executes arbitrary commands as root in a container namespace.
+
+
+OPTIONS
+-------
+The following container options are available:
+
+*-n, --name='NAME'*::
+	Specify container name. Specifying 'ALL' will start all stopped container.
+
+
+EXAMPLES
+--------
+*Run 'hostname' in example.net container:*::
+	sudo container run -n example.net -- hostname
+
+*Create and delete a file in example.net container:*::
+	sudo container run -n example.net -- 'touch /tmp/foo && rm -f /tmp/foo'
+
+
+SEE ALSO
+--------
+compute-tools(7),
+container(1).
+
+
+HOMEPAGE
+--------
+More information about compute-tools and the Open Infrastructure project can be found on the homepage at https://open-infrastructure.net.
+
+
+CONTACT
+-------
+Bug reports, feature requests, help, patches, support and everything else
+are welcome on the Open Infrastructure Software Mailing List <software@lists.open-infrastructure.net>.
+
+Debian specific bugs can also be reported in the Debian Bug Tracking System at https://bugs.debian.org.
+
+
+AUTHORS
+-------
+compute-tools were written by Daniel Baumann <daniel.baumann@open-infrastructure.net> and others.
diff --git a/share/man/container.1.txt b/share/man/container.1.txt
index 02cdc64..c0fd182 100644
--- a/share/man/container.1.txt
+++ b/share/man/container.1.txt
@@ -75,6 +75,9 @@ The following container commands are available:
 *enter*::
 	Enter a container namespace, see container-enter(1).
 
+*run*::
+	Execute commands in a container namespace, see container-run(1).
+
 *key*::
 	Manage GnuPG keyring for container operations, see container-key(1).