docs: Create CentOS/RHEL 7 installation guide

Write a document explaining how to install Clear Containers 3.0 on a
CentOS 7 or RHEL 7 system. Added associated scripts and configuration
files (which are lightly modified versions from
https://github.com/01org/cc-oci-runtime).

Fixes clearcontainers#371.

Signed-off-by: James O. D. Hunt <[email protected]>

docs/centos+rhel-installation-guide.md

@@ -0,0 +1,58 @@
+# Installing Intel® Clear Containers 3.0 Alpha on CentOS version 7 or RHEL version 7.
+
+## Required Setup
+
+The installation requires the current user to run sudo without specifying a password. Verify this with the following commands:
+
+```
+$ su -
+# echo "$some_user ALL=(ALL:ALL) NOPASSWD: ALL" | (EDITOR="tee -a" visudo)
+$ exit
+
+```
+
+## Installation steps
+
+1. Ensure the system packages are up-to-date by running the following:
+
+```
+$ sudo yum -y update
+
+```
+2. Install Git:
+
+```
+$ sudo yum install -y git
+
+```
+3. Create the installation directory and clone the repository with the following commands:
+
+```
+$ mkdir -p $HOME/go/src/github/clearcontainers
+$ cd $HOME/go/src/github/clearcontainers
+$ git clone https://github.com/clearcontainers/runtime
+$ cd runtime
+
+```
+4. Run the installation script:
+
+```
+$ ./installation/centos+rhel-setup.sh
+
+```
+
+## Verify the installation was successful
+
+1. Check the `cc-runtime` version with the following command:
+
+```
+$ cc-runtime --version
+
+```
+
+2. Run an example with the following command:
+
+```
+$ sudo docker run -ti busybox sh
+
+```

installation/centos+rhel-setup.sh

@@ -0,0 +1,158 @@
+#!/bin/bash
+
+#  This file is part of cc-runtime.
+#
+#  Copyright (C) 2017 Intel Corporation
+#
+#  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 2
+#  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, write to the Free Software
+#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+# Description: This script installs a usable version of qemu on a
+#   CentOS 7 or RHEL 7 system.
+
+SCRIPT_PATH=$(dirname "$(readlink -f "$0")")
+source "${SCRIPT_PATH}/installation-setup.sh"
+source "${SCRIPT_PATH}/../versions.txt"
+
+# List of packages to install to satisfy build dependencies
+pkgs=""
+
+mnl_dev_pkg="libmnl-devel"
+
+# general
+pkgs+=" zlib-devel"
+pkgs+=" gettext-devel"
+pkgs+=" libtool-ltdl-devel"
+pkgs+=" libtool-ltdl"
+pkgs+=" glib2-devel"
+pkgs+=" bzip2"
+pkgs+=" m4"
+
+# for yum-config-manager
+pkgs+=" yum-utils"
+
+# runtime dependencies
+pkgs+=" libuuid-devel"
+pkgs+=" libmnl"
+pkgs+=" ${mnl_dev_pkg}"
+pkgs+=" libffi-devel"
+pkgs+=" pcre-devel"
+
+# qemu lite dependencies
+pkgs+=" libattr-devel"
+pkgs+=" libcap-devel"
+pkgs+=" libcap-ng-devel"
+pkgs+=" pixman-devel"
+
+pkgs+=" gcc-c++"
+
+if [ "$os_distribution" = rhel ]
+then
+    # RHEL doesn't provide "*-devel" packages unless the "Optional RPMS"
+    # repository is enabled. However, to make life fun, there isn't a
+    # clean way to determine if that repository is enabled (the output
+    # format of "yum repolist" seems to change frequently and
+    # subscription-manager's output isn't designed for easy script
+    # consumption).
+    #
+    # Therefore, the safest approach seems to be to check if a known
+    # required development package is known to yum(8). If it isn't, the
+    # user will need to enable the extra repository.
+    #
+    # Note that this issue is unique to RHEL: yum on CentOS provides
+    # access to developemnt packages by default.
+
+    yum info "${mnl_dev_pkg}" >/dev/null 2>&1
+    if [ $? -ne 0 ]
+    then
+        echo >&2 "ERROR: You must enable the 'optional' repository for '*-devel' packages"
+        exit 1
+    fi
+fi
+
+source /etc/os-release
+
+major_version=$(echo "${VERSION_ID}"|cut -d\. -f1)
+
+if [ "$os_distribution" = rhel ]
+then
+    distro="RHEL"
+elif [ "$os_distribution" = centos ]
+then
+    distro="CentOS"
+else
+    echo >&2 "ERROR: Unrecognised distribution: $os_distribution"
+    echo >&2 "ERROR: This script is designed to work on CentOS and RHEL systems only."
+    exit 1
+fi
+
+cc_repo_url="http://download.opensuse.org/repositories/home:/clearcontainers:/clear-containers-3/${distro}_${major_version}/home:clearcontainers:clear-containers-3.repo"
+
+sudo yum -y update
+eval sudo yum -y install "$pkgs"
+
+sudo yum groupinstall -y 'Development Tools'
+
+pushd "$deps_dir"
+
+# Install pre-requisites for gcc
+curl -L -O ftp://gcc.gnu.org/pub/gcc/infrastructure/gmp-${gmp_version}.tar.bz2
+compile gmp gmp-${gmp_version}.tar.bz2 gmp-${gmp_version}
+
+curl -L -O ftp://gcc.gnu.org/pub/gcc/infrastructure/mpfr-${mpfr_version}.tar.bz2
+compile mpfr mpfr-${mpfr_version}.tar.bz2 mpfr-${mpfr_version}
+
+curl -L -O ftp://gcc.gnu.org/pub/gcc/infrastructure/mpc-${mpc_version}.tar.gz
+compile mpc mpc-${mpc_version}.tar.gz mpc-${mpc_version}
+
+# Install glib
+glib_setup
+
+# Install json-glib
+json_glib_setup
+
+# Install gcc
+gcc_setup
+
+# Install qemu-lite
+qemu_lite_setup
+
+popd
+
+# Install docker
+sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
+sudo yum -y install docker-ce
+
+# Install Clear Containers components and their dependencies
+sudo yum-config-manager --add-repo "${cc_repo_url}"
+sudo yum -y install cc-runtime cc-proxy cc-shim
+
+# Override runtime configuration to use hypervisor from prefix_dir
+# rather than the OBS default values.
+sudo -E prefix_dir=$prefix_dir sed -i -e \
+    "s,^path = \"/usr/bin/qemu-system-x86_64\",path = \"${prefix_dir}/bin/qemu-system-x86_64\",g" \
+    /etc/clear-containers/configuration.toml
+
+# Configure CC by default
+sudo mkdir -p /etc/systemd/system/docker.service.d/
+cat <<EOF|sudo tee /etc/systemd/system/docker.service.d/clear-containers.conf
+[Service]
+ExecStart=
+ExecStart=/usr/bin/dockerd -D --add-runtime cc-runtime=/usr/bin/cc-runtime --default-runtime=cc-runtime
+EOF
+
+sudo systemctl daemon-reload
+sudo systemctl restart docker
+sudo systemctl enable cc-proxy.socket
+sudo systemctl start cc-proxy.socket