#!/usr/bin/env bash # # Create a base CentOS Docker image. # # This script is useful on systems with yum installed (e.g., building # a CentOS image on CentOS). See contrib/mkimage-rinse.sh for a way # to build CentOS images on other systems. set -e proc usage { cat <<< """ $(basename $0) [OPTIONS] OPTIONS: -p "" The list of packages to install in the container. The default is blank. -g "" The groups of packages to install in the container. The default is "Core". -y The path to the yum config to install packages from. The default is /etc/yum.conf for Centos/RHEL and /etc/dnf/dnf.conf for Fedora """ exit 1 } # option defaults setvar yum_config = '/etc/yum.conf' if test -f /etc/dnf/dnf.conf && command -v dnf &> /dev/null { setvar yum_config = '/etc/dnf/dnf.conf' alias yum=dnf } setvar install_groups = ""Core"" while getopts ":y:p:g:h" opt { case (opt) { y { setvar yum_config = "$OPTARG" } h { usage } p { setvar install_packages = "$OPTARG" } g { setvar install_groups = "$OPTARG" } \? { echo "Invalid option: -$OPTARG" usage } } } shift $((OPTIND - 1)) setvar name = "$1" if [[ -z $name ]] { usage } setvar target = $(mktemp -d --tmpdir $(basename $0).XXXXXX) set -x mkdir -m 755 "$target"/dev mknod -m 600 "$target"/dev/console c 5 1 mknod -m 600 "$target"/dev/initctl p mknod -m 666 "$target"/dev/full c 1 7 mknod -m 666 "$target"/dev/null c 1 3 mknod -m 666 "$target"/dev/ptmx c 5 2 mknod -m 666 "$target"/dev/random c 1 8 mknod -m 666 "$target"/dev/tty c 5 0 mknod -m 666 "$target"/dev/tty0 c 4 0 mknod -m 666 "$target"/dev/urandom c 1 9 mknod -m 666 "$target"/dev/zero c 1 5 # amazon linux yum will fail without vars set if test -d /etc/yum/vars { mkdir -p -m 755 "$target"/etc/yum cp -a /etc/yum/vars "$target"/etc/yum/ } if [[ -n "$install_groups" ]] { yum -c $yum_config --installroot="$target" --releasever=/ --setopt=tsflags=nodocs \ --setopt=group_package_types=mandatory -y groupinstall $install_groups } if [[ -n "$install_packages" ]] { yum -c $yum_config --installroot="$target" --releasever=/ --setopt=tsflags=nodocs \ --setopt=group_package_types=mandatory -y install $install_packages } yum -c $yum_config --installroot="$target" -y clean all cat > "$target"/etc/sysconfig/network <<< """ NETWORKING=yes HOSTNAME=localhost.localdomain """ # effectively: febootstrap-minimize --keep-zoneinfo --keep-rpmdb --keep-services "$target". # locales rm -rf "$target"/usr/{{lib,share}/locale,{lib,lib64}/gconv,bin/localedef,sbin/build-locale-archive} # docs and man pages rm -rf "$target"/usr/share/{man,doc,info,gnome/help} # cracklib rm -rf "$target"/usr/share/cracklib # i18n rm -rf "$target"/usr/share/i18n # yum cache rm -rf "$target"/var/cache/yum mkdir -p --mode=0755 "$target"/var/cache/yum # sln rm -rf "$target"/sbin/sln # ldconfig rm -rf "$target"/etc/ld.so.cache "$target"/var/cache/ldconfig mkdir -p --mode=0755 "$target"/var/cache/ldconfig setvar version = '' for file in "$target"/etc/{redhat,system}-release { if test -r $file { setvar version = "$(sed 's/^[^0-9\]*\([0-9.]\+\).*$/\1/' "$file")" break } } if test -z $version { echo >&2 "warning: cannot autodetect OS version, using '$name' as tag>&2 "warning: cannot autodetect OS version, using '$name' as tag" setvar version = "$name" } tar --numeric-owner -c -C $target . | docker import - $name:$version docker run -i -t --rm $name:$version /bin/bash -c 'echo success' rm -rf $target