templates/lxc-alpine.in

   1 #!/bin/sh
   2
   3 key_sha256sums="9c102bcc376af1498d549b77bdbfa815ae86faa1d2d82f040e616b18ef2df2d4  alpine-devel@lists.alpinelinux.org-4a6a0840.rsa.pub
   4 2adcf7ce224f476330b5360ca5edb92fd0bf91c92d83292ed028d7c4e26333ab  alpine-devel@lists.alpinelinux.org-4d07755e.rsa.pub"
   5
   6 get_static_apk () {
   7     wget="wget -q -O -"
   8     pkglist=alpine-keys:apk-tools-static
   9     auto_repo_dir=
  10
  11     if [ -z "$repository" ]; then
  12         url=http://wiki.alpinelinux.org/cgi-bin/dl.cgi
  13         if [ -z "$release" ]; then
  14             echo -n "Determining the latest release... "
  15             release=$($wget $url/.latest.$apk_arch.txt | \
  16                 cut -d " " -f 3 | cut -d / -f 1 | uniq)
  17             if [ -z "$release" ]; then
  18                 echo failed
  19                 return 1
  20             fi
  21             echo $release
  22         fi
  23         auto_repo_dir=$release/main
  24         repository=$url/$auto_repo_dir
  25         pkglist=$pkglist:alpine-mirrors
  26     fi
  27
  28     rootfs="$1"
  29     echo "Using static apk from $repository/$apk_arch"
  30     wget="$wget $repository/$apk_arch"
  31
  32     # parse APKINDEX to find the current versions
  33     static_pkgs=$($wget/APKINDEX.tar.gz | \
  34         tar -Oxz APKINDEX | \
  35         awk -F: -v pkglist=$pkglist '
  36             BEGIN { split(pkglist,pkg) }
  37             $0 != "" { f[$1] = $2 }
  38             $0 == "" { for (i in pkg)
  39                            if (pkg[i] == f["P"])
  40                                print(f["P"] "-" f["V"] ".apk") }')
  41     [ "$static_pkgs" ] || return 1
  42
  43     mkdir -p "$rootfs" || return 1
  44     for pkg in $static_pkgs; do
  45         echo "Downloading $pkg"
  46         $wget/$pkg | tar -xz -C "$rootfs"
  47     done
  48
  49     # clean up .apk meta files
  50     rm -f "$rootfs"/.[A-Z]*
  51
  52     # verify checksum of the key
  53     keyname=$(echo $rootfs/sbin/apk.static.*.pub | sed 's/.*\.SIGN\.RSA\.//')
  54     checksum=$(echo "$key_sha256sums" |  grep -w "$keyname")
  55     if [ -z "$checksum" ]; then
  56         echo "ERROR: checksum is missing for $keyname"
  57         return 1
  58     fi
  59     (cd $rootfs/etc/apk/keys && echo "$checksum" | sha256sum -c -) || return 1
  60
  61     # verify the static apk binary signature
  62     APK=$rootfs/sbin/apk.static
  63     openssl dgst -verify $rootfs/etc/apk/keys/$keyname \
  64         -signature "$APK.SIGN.RSA.$keyname" "$APK" || return 1
  65
  66     if [ "$auto_repo_dir" ]; then
  67         mirror_list=$rootfs/usr/share/alpine-mirrors/MIRRORS.txt
  68         mirror_count=$(wc -l $mirror_list | cut -d " " -f 1)
  69         repository=$(sed $(expr $RANDOM % $mirror_count + 1)\!d \
  70             $mirror_list)$auto_repo_dir
  71         echo "Selecting mirror $repository"
  72     fi
  73 }
  74
  75 install_alpine() {
  76     rootfs="$1"
  77     shift
  78     mkdir -p "$rootfs"/etc/apk || return 1
  79     : ${keys_dir:=/etc/apk/keys}
  80     if ! [ -d "$rootfs"/etc/apk/keys ] && [ -d "$keys_dir" ]; then
  81         cp -r "$keys_dir" "$rootfs"/etc/apk/keys
  82     fi
  83     if [ -n "$repository" ]; then
  84         echo "$repository" > "$rootfs"/etc/apk/repositories
  85     else
  86         cp /etc/apk/repositories "$rootfs"/etc/apk/repositories || return 1
  87         if [ -n "$release" ]; then
  88             sed -i -e "s:/[^/]\+/\([^/]\+\)$:/$release/\1:" \
  89                 "$rootfs"/etc/apk/repositories
  90         fi
  91     fi
  92     opt_arch=
  93     if [ -n "$apk_arch" ]; then
  94         opt_arch="--arch $apk_arch"
  95     fi
  96     $APK add -U --initdb --root $rootfs $opt_arch "$@" alpine-base
  97 }
  98
  99 configure_alpine() {
 100     rootfs="$1"
 101     echo "Setting up /etc/inittab"
 102     cat >"$rootfs"/etc/inittab<<EOF
 103 ::sysinit:/sbin/rc sysinit
 104 ::wait:/sbin/rc default
 105 tty1:12345:respawn:/sbin/getty 38400 tty1
 106 ::ctrlaltdel:/sbin/reboot
 107 ::shutdown:/sbin/rc shutdown
 108 EOF
 109     # set up nameserver
 110     grep nameserver /etc/resolv.conf > "$rootfs/etc/resolv.conf"
 111
 112     # configure the network using the dhcp
 113     cat <<EOF > $rootfs/etc/network/interfaces
 114 auto lo
 115 iface lo inet loopback
 116
 117 auto eth0
 118 iface eth0 inet dhcp
 119 EOF
 120
 121     # set the hostname
 122     echo $hostname > $rootfs/etc/hostname
 123
 124     # missing device nodes
 125     echo "Setting up device nodes"
 126     mkdir -p -m 755 "$rootfs/dev/pts"
 127     mkdir -p -m 1777 "$rootfs/dev/shm"
 128     mknod -m 666 "$rootfs/dev/zero" c 1 5
 129     mknod -m 666 "$rootfs/dev/full" c 1 7
 130     mknod -m 666 "$rootfs/dev/random" c 1 8
 131     mknod -m 666 "$rootfs/dev/urandom" c 1 9
 132     mknod -m 666 "$rootfs/dev/tty0" c 4 0
 133     mknod -m 666 "$rootfs/dev/tty1" c 4 1
 134     mknod -m 666 "$rootfs/dev/tty2" c 4 2
 135     mknod -m 666 "$rootfs/dev/tty3" c 4 3
 136     mknod -m 666 "$rootfs/dev/tty4" c 4 4
 137 #    mknod -m 600 "$rootfs/dev/initctl" p
 138     mknod -m 666 "$rootfs/dev/tty" c 5 0
 139     mknod -m 666 "$rootfs/dev/console" c 5 1
 140     mknod -m 666 "$rootfs/dev/ptmx" c 5 2
 141
 142     # start services
 143     ln -s /etc/init.d/syslog "$rootfs"/etc/runlevels/default/syslog
 144
 145     return 0
 146 }
 147
 148 copy_configuration() {
 149     path=$1
 150     rootfs=$2
 151     hostname=$3
 152
 153     grep -q "^lxc.rootfs" $path/config 2>/dev/null \
 154         || echo "lxc.rootfs = $rootfs" >> $path/config
 155     if [ -n "$lxc_arch" ]; then
 156         echo "lxc.arch = $lxc_arch" >> $path/config
 157     fi
 158
 159     lxc_network_link_line="# lxc.network.link = br0"
 160     for br in lxcbr0 virbr0 br0; do
 161         if [ -d /sys/class/net/$br/bridge ]; then
 162             lxc_network_link_line="lxc.network.link = $br"
 163             break
 164         fi
 165     done
 166
 167     if ! grep -q "^lxc.network.type" $path/config 2>/dev/null; then
 168         cat <<EOF >> $path/config
 169 lxc.network.type = veth
 170 $lxc_network_link_line
 171 lxc.network.flags = up
 172 EOF
 173     fi
 174
 175     # if there is exactly one veth or macvlan network entry, make sure
 176     # it has an associated mac address.
 177     nics=$(awk -F '[ \t]*=[ \t]*' \
 178         '$1=="lxc.network.type" && ($2=="veth" || $2=="macvlan") {print $2}' \
 179         $path/config | wc -l)
 180     if [ "$nics" -eq 1 ] && ! grep -q "^lxc.network.hwaddr" $path/config; then
 181         # see http://sourceforge.net/tracker/?func=detail&aid=3411497&group_id=163076&atid=826303
 182         hwaddr="fe:$(dd if=/dev/urandom bs=8 count=1 2>/dev/null |od -t x8 | \
 183                       head -1 |awk '{print $2}' | cut -c1-10 |\
 184                       sed 's/\(..\)/\1:/g; s/.$//')"
 185         echo "lxc.network.hwaddr = $hwaddr" >> $path/config
 186     fi
 187
 188     cat <<EOF >> $path/config
 189
 190 lxc.tty = 4
 191 lxc.pts = 1024
 192 lxc.utsname = $hostname
 193 lxc.cap.drop = sys_module mac_admin mac_override sys_time
 194
 195 # When using LXC with apparmor, uncomment the next line to run unconfined:
 196 #lxc.aa_profile = unconfined
 197
 198 # devices
 199 lxc.cgroup.devices.deny = a
 200 # /dev/null, zero and full
 201 lxc.cgroup.devices.allow = c 1:3 rwm
 202 lxc.cgroup.devices.allow = c 1:5 rwm
 203 lxc.cgroup.devices.allow = c 1:7 rwm
 204 # consoles
 205 lxc.cgroup.devices.allow = c 5:1 rwm
 206 lxc.cgroup.devices.allow = c 5:0 rwm
 207 lxc.cgroup.devices.allow = c 4:0 rwm
 208 lxc.cgroup.devices.allow = c 4:1 rwm
 209 # /dev/{,u}random
 210 lxc.cgroup.devices.allow = c 1:9 rwm
 211 lxc.cgroup.devices.allow = c 1:8 rwm
 212 lxc.cgroup.devices.allow = c 136:* rwm
 213 lxc.cgroup.devices.allow = c 5:2 rwm
 214 # rtc
 215 lxc.cgroup.devices.allow = c 254:0 rm
 216
 217 # mounts point
 218 lxc.mount.entry=proc proc proc nodev,noexec,nosuid 0 0
 219 lxc.mount.entry=run run tmpfs nodev,noexec,nosuid,relatime,size=1m,mode=0755 0 0
 220 lxc.mount.entry=none dev/pts devpts gid=5,mode=620 0 0
 221
 222 EOF
 223
 224     return 0
 225 }
 226
 227 die() {
 228     echo "$@" >&2
 229     exit 1
 230 }
 231
 232 usage() {
 233     cat >&2 <<EOF
 234 Usage: $(basename $0) [-h|--help] [-r|--repository <url>]
 235                    [-R|--release <release>] [-a|--arch <arch>]
 236                    [--rootfs <rootfs>] -p|--path <path> -n|--name <name>
 237                    [PKG...]
 238 EOF
 239 }
 240
 241 usage_err() {
 242     usage
 243     exit 1
 244 }
 245
 246 optarg_check() {
 247     if [ -z "$2" ]; then
 248         usage_err "option '$1' requires an argument"
 249     fi
 250 }
 251
 252 default_path=@LXCPATH@
 253 release=
 254 arch=$(uname -m)
 255
 256 # template mknods, requires root
 257 if [ $(id -u) -ne 0 ]; then
 258    echo "$(basename $0): must be run as root" >&2
 259    exit 1
 260 fi
 261
 262 while [ $# -gt 0 ]; do
 263     opt="$1"
 264     shift
 265     case "$opt" in
 266     -h|--help)
 267         usage
 268         exit 0
 269         ;;
 270     -n|--name)
 271         optarg_check $opt "$1"
 272         name=$1
 273         shift
 274         ;;
 275     --rootfs)
 276         optarg_check $opt "$1"
 277         rootfs=$1
 278         shift
 279         ;;
 280     -p|--path)
 281         optarg_check $opt "$1"
 282         path=$1
 283         shift
 284         ;;
 285     -r|--repository)
 286         optarg_check $opt "$1"
 287         repository=$1
 288         shift
 289         ;;
 290     -R|--release)
 291         optarg_check $opt "$1"
 292         release=$1
 293         shift
 294         ;;
 295     -a|--arch)
 296         optarg_check $opt "$1"
 297         arch=$1
 298         shift
 299         ;;
 300     --)
 301         break;;
 302     --*=*)
 303         # split --myopt=foo=bar into --myopt foo=bar
 304         set -- ${opt%=*} ${opt#*=} "$@"
 305         ;;
 306     -?)
 307         usage_err "unknown option '$opt'"
 308         ;;
 309     -*)
 310         # split opts -abc into -a -b -c
 311         set -- $(echo "${opt#-}" | sed 's/\(.\)/ -\1/g') "$@"
 312         ;;
 313     esac
 314 done
 315
 316
 317 [ -z "$name" ] && usage_err
 318
 319 if [ -z "${path}" ]; then
 320     path="${default_path}/${name}"
 321 fi
 322
 323 if [ -z "$rootfs" ]; then
 324     rootfs=`awk -F= '$1 ~ /^lxc.rootfs/ { print $2 }' "$path/config" 2>/dev/null`
 325     if [ -z "$rootfs" ]; then
 326         rootfs="${path}/rootfs"
 327     fi
 328 fi
 329
 330 lxc_arch=$arch
 331 apk_arch=$arch
 332
 333 case "$arch" in
 334         i[3-6]86)
 335                 apk_arch=x86;;
 336         x86)
 337                 lxc_arch=i686;;
 338         x86_64|"") ;;
 339         *)      die "unsupported architecture: $arch";;
 340 esac
 341
 342 : ${APK:=apk}
 343 if ! which $APK >/dev/null; then
 344     get_static_apk "$rootfs" || die "Failed to download a valid static apk"
 345 fi
 346
 347 install_alpine "$rootfs" "$@" || die "Failed to install rootfs for $name"
 348 configure_alpine "$rootfs" "$name" || die "Failed to configure $name"
 349 copy_configuration "$path" "$rootfs" "$name"