templates/lxc-alpine.in

   1 #!/bin/sh
   2
   3 # Detect use under userns (unsupported)
   4 for arg in "$@"; do
   5     [ "$arg" = "--" ] && break
   6     if [ "$arg" = "--mapped-uid" -o "$arg" = "--mapped-gid" ]; then
   7         echo "This template can't be used for unprivileged containers." 1>&2
   8         echo "You may want to try the \"download\" template instead." 1>&2
   9         exit 1
  10     fi
  11 done
  12
  13 # Make sure the usual locations are in PATH
  14 PATH=$PATH:/usr/sbin:/usr/bin:/sbin:/bin
  15 export PATH
  16
  17 key_sha256sums="9c102bcc376af1498d549b77bdbfa815ae86faa1d2d82f040e616b18ef2df2d4  alpine-devel@lists.alpinelinux.org-4a6a0840.rsa.pub
  18 2adcf7ce224f476330b5360ca5edb92fd0bf91c92d83292ed028d7c4e26333ab  alpine-devel@lists.alpinelinux.org-4d07755e.rsa.pub
  19 ebf31683b56410ecc4c00acd9f6e2839e237a3b62b5ae7ef686705c7ba0396a9  alpine-devel@lists.alpinelinux.org-5243ef4b.rsa.pub
  20 1bb2a846c0ea4ca9d0e7862f970863857fc33c32f5506098c636a62a726a847b  alpine-devel@lists.alpinelinux.org-524d27bb.rsa.pub
  21 12f899e55a7691225603d6fb3324940fc51cd7f133e7ead788663c2b7eecb00c  alpine-devel@lists.alpinelinux.org-5261cecb.rsa.pub"
  22
  23
  24 get_static_apk () {
  25     wget="wget -q -O -"
  26     pkglist=alpine-keys:apk-tools-static
  27     auto_repo_dir=
  28
  29     if [ -z "$repository" ]; then
  30         url=http://wiki.alpinelinux.org/cgi-bin/dl.cgi
  31         if [ -z "$release" ]; then
  32             echo -n "Determining the latest release... "
  33             release=$($wget $url/.latest.$apk_arch.txt | \
  34                 cut -d " " -f 3 | cut -d / -f 1 | uniq)
  35             if [ -z "$release" ]; then
  36                 echo failed
  37                 return 1
  38             fi
  39             echo $release
  40         fi
  41         auto_repo_dir=$release/main
  42         repository=$url/$auto_repo_dir
  43         pkglist=$pkglist:alpine-mirrors
  44     fi
  45
  46     rootfs="$1"
  47     echo "Using static apk from $repository/$apk_arch"
  48     wget="$wget $repository/$apk_arch"
  49
  50     # parse APKINDEX to find the current versions
  51     static_pkgs=$($wget/APKINDEX.tar.gz | \
  52         tar -Oxz APKINDEX | \
  53         awk -F: -v pkglist=$pkglist '
  54             BEGIN { split(pkglist,pkg) }
  55             $0 != "" { f[$1] = $2 }
  56             $0 == "" { for (i in pkg)
  57                            if (pkg[i] == f["P"])
  58                                print(f["P"] "-" f["V"] ".apk") }')
  59     [ "$static_pkgs" ] || return 1
  60
  61     mkdir -p "$rootfs" || return 1
  62     for pkg in $static_pkgs; do
  63         echo "Downloading $pkg"
  64         $wget/$pkg | tar -xz -C "$rootfs"
  65     done
  66
  67     # clean up .apk meta files
  68     rm -f "$rootfs"/.[A-Z]*
  69
  70     # verify checksum of the key
  71     keyname=$(echo $rootfs/sbin/apk.static.*.pub | sed 's/.*\.SIGN\.RSA\.//')
  72     checksum=$(echo "$key_sha256sums" |  grep -w "$keyname")
  73     if [ -z "$checksum" ]; then
  74         echo "ERROR: checksum is missing for $keyname"
  75         return 1
  76     fi
  77     (cd $rootfs/etc/apk/keys && echo "$checksum" | sha256sum -c -) || return 1
  78
  79     # verify the static apk binary signature
  80     APK=$rootfs/sbin/apk.static
  81     openssl dgst -verify $rootfs/etc/apk/keys/$keyname \
  82         -signature "$APK.SIGN.RSA.$keyname" "$APK" || return 1
  83
  84     if [ "$auto_repo_dir" ]; then
  85         mirror_list=$rootfs/usr/share/alpine-mirrors/MIRRORS.txt
  86         mirror_count=$(wc -l $mirror_list | cut -d " " -f 1)
  87         random=$(hexdump -n 2 -e '/2 "%u"' /dev/urandom)
  88         repository=$(sed $(expr $random % $mirror_count + 1)\!d \
  89             $mirror_list)$auto_repo_dir
  90         echo "Selecting mirror $repository"
  91     fi
  92 }
  93
  94 install_alpine() {
  95     rootfs="$1"
  96     shift
  97     mkdir -p "$rootfs"/etc/apk || return 1
  98     : ${keys_dir:=/etc/apk/keys}
  99     if ! [ -d "$rootfs"/etc/apk/keys ] && [ -d "$keys_dir" ]; then
 100         cp -r "$keys_dir" "$rootfs"/etc/apk/keys
 101     fi
 102     if [ -n "$repository" ]; then
 103         echo "$repository" > "$rootfs"/etc/apk/repositories
 104     else
 105         cp /etc/apk/repositories "$rootfs"/etc/apk/repositories || return 1
 106         if [ -n "$release" ]; then
 107             sed -i -e "s:/[^/]\+/\([^/]\+\)$:/$release/\1:" \
 108                 "$rootfs"/etc/apk/repositories
 109         fi
 110     fi
 111     opt_arch=
 112     if [ -n "$apk_arch" ]; then
 113         opt_arch="--arch $apk_arch"
 114     fi
 115     $APK add -U --initdb --root $rootfs $opt_arch "$@" alpine-base
 116 }
 117
 118 configure_alpine() {
 119     rootfs="$1"
 120     echo "Setting up /etc/inittab"
 121     cat >"$rootfs"/etc/inittab<<EOF
 122 ::sysinit:/sbin/rc sysinit
 123 ::wait:/sbin/rc default
 124 console:12345:respawn:/sbin/getty 38400 console
 125 tty1:12345:respawn:/sbin/getty 38400 tty1
 126 tty2:12345:respawn:/sbin/getty 38400 tty2
 127 tty3:12345:respawn:/sbin/getty 38400 tty3
 128 tty4:12345:respawn:/sbin/getty 38400 tty4
 129 ::ctrlaltdel:/sbin/reboot
 130 ::shutdown:/sbin/rc shutdown
 131 EOF
 132     # set up timezone
 133     if [ -f /etc/TZ ]; then
 134         cp /etc/TZ "$rootfs/etc/TZ"
 135     fi
 136
 137     # set up nameserver
 138     grep nameserver /etc/resolv.conf > "$rootfs/etc/resolv.conf"
 139
 140     # configure the network using the dhcp
 141     cat <<EOF > $rootfs/etc/network/interfaces
 142 auto lo
 143 iface lo inet loopback
 144
 145 auto eth0
 146 iface eth0 inet dhcp
 147 EOF
 148
 149     # set the hostname
 150     echo $hostname > $rootfs/etc/hostname
 151
 152     # missing device nodes
 153     echo "Setting up device nodes"
 154     mkdir -p -m 755 "$rootfs/dev/pts"
 155     mkdir -p -m 1777 "$rootfs/dev/shm"
 156     mknod -m 666 "$rootfs/dev/zero" c 1 5
 157     mknod -m 666 "$rootfs/dev/full" c 1 7
 158     mknod -m 666 "$rootfs/dev/random" c 1 8
 159     mknod -m 666 "$rootfs/dev/urandom" c 1 9
 160     mknod -m 666 "$rootfs/dev/tty0" c 4 0
 161     mknod -m 666 "$rootfs/dev/tty1" c 4 1
 162     mknod -m 666 "$rootfs/dev/tty2" c 4 2
 163     mknod -m 666 "$rootfs/dev/tty3" c 4 3
 164     mknod -m 666 "$rootfs/dev/tty4" c 4 4
 165 #    mknod -m 600 "$rootfs/dev/initctl" p
 166     mknod -m 666 "$rootfs/dev/tty" c 5 0
 167     mknod -m 666 "$rootfs/dev/console" c 5 1
 168     mknod -m 666 "$rootfs/dev/ptmx" c 5 2
 169
 170     # start services
 171     ln -s /etc/init.d/bootmisc "$rootfs"/etc/runlevels/boot/bootmisc
 172     ln -s /etc/init.d/syslog "$rootfs"/etc/runlevels/boot/syslog
 173
 174     return 0
 175 }
 176
 177 copy_configuration() {
 178     path=$1
 179     rootfs=$2
 180     hostname=$3
 181
 182     grep -q "^lxc.rootfs" $path/config 2>/dev/null \
 183         || echo "lxc.rootfs = $rootfs" >> $path/config
 184     if [ -n "$lxc_arch" ]; then
 185         echo "lxc.arch = $lxc_arch" >> $path/config
 186     fi
 187
 188     lxc_network_link_line="# lxc.network.link = br0"
 189     for br in lxcbr0 virbr0 br0; do
 190         if [ -d /sys/class/net/$br/bridge ]; then
 191             lxc_network_link_line="lxc.network.link = $br"
 192             break
 193         fi
 194     done
 195
 196     if ! grep -q "^lxc.network.type" $path/config 2>/dev/null; then
 197         cat <<EOF >> $path/config
 198 lxc.network.type = veth
 199 $lxc_network_link_line
 200 lxc.network.flags = up
 201 EOF
 202     fi
 203
 204     # if there is exactly one veth or macvlan network entry, make sure
 205     # it has an associated mac address.
 206     nics=$(awk -F '[ \t]*=[ \t]*' \
 207         '$1=="lxc.network.type" && ($2=="veth" || $2=="macvlan") {print $2}' \
 208         $path/config | wc -l)
 209     if [ "$nics" -eq 1 ] && ! grep -q "^lxc.network.hwaddr" $path/config; then
 210         # see http://sourceforge.net/tracker/?func=detail&aid=3411497&group_id=163076&atid=826303
 211         hwaddr="fe:$(dd if=/dev/urandom bs=8 count=1 2>/dev/null |od -t x8 | \
 212                       head -n 1 |awk '{print $2}' | cut -c1-10 |\
 213                       sed 's/\(..\)/\1:/g; s/.$//')"
 214         echo "lxc.network.hwaddr = $hwaddr" >> $path/config
 215     fi
 216
 217     cat <<EOF >> $path/config
 218
 219 lxc.tty = 4
 220 lxc.pts = 1024
 221 lxc.utsname = $hostname
 222 lxc.cap.drop = sys_module mac_admin mac_override sys_time sys_admin
 223
 224 # When using LXC with apparmor, uncomment the next line to run unconfined:
 225 #lxc.aa_profile = unconfined
 226
 227 # devices
 228 lxc.cgroup.devices.deny = a
 229 # /dev/null, zero and full
 230 lxc.cgroup.devices.allow = c 1:3 rwm
 231 lxc.cgroup.devices.allow = c 1:5 rwm
 232 lxc.cgroup.devices.allow = c 1:7 rwm
 233 # consoles
 234 lxc.cgroup.devices.allow = c 5:1 rwm
 235 lxc.cgroup.devices.allow = c 5:0 rwm
 236 lxc.cgroup.devices.allow = c 4:0 rwm
 237 lxc.cgroup.devices.allow = c 4:1 rwm
 238 # /dev/{,u}random
 239 lxc.cgroup.devices.allow = c 1:9 rwm
 240 lxc.cgroup.devices.allow = c 1:8 rwm
 241 lxc.cgroup.devices.allow = c 136:* rwm
 242 lxc.cgroup.devices.allow = c 5:2 rwm
 243 # rtc
 244 lxc.cgroup.devices.allow = c 254:0 rm
 245
 246 # mounts point
 247 lxc.mount.entry=proc proc proc nodev,noexec,nosuid 0 0
 248 lxc.mount.entry=run run tmpfs nodev,noexec,nosuid,relatime,size=1m,mode=0755 0 0
 249 lxc.mount.entry=none dev/pts devpts gid=5,mode=620 0 0
 250 lxc.mount.entry=shm dev/shm tmpfs nodev,nosuid,noexec,mode=1777 0 0
 251
 252 EOF
 253
 254     return 0
 255 }
 256
 257 die() {
 258     echo "$@" >&2
 259     exit 1
 260 }
 261
 262 usage() {
 263     cat >&2 <<EOF
 264 Usage: $(basename $0) [-h|--help] [-r|--repository <url>]
 265                    [-R|--release <release>] [-a|--arch <arch>]
 266                    [--rootfs <rootfs>] -p|--path <path> -n|--name <name>
 267                    [PKG...]
 268 EOF
 269 }
 270
 271 usage_err() {
 272     usage
 273     exit 1
 274 }
 275
 276 optarg_check() {
 277     if [ -z "$2" ]; then
 278         usage_err "option '$1' requires an argument"
 279     fi
 280 }
 281
 282 default_path=@LXCPATH@
 283 release=
 284 arch=$(uname -m)
 285
 286 # template mknods, requires root
 287 if [ $(id -u) -ne 0 ]; then
 288    echo "$(basename $0): must be run as root" >&2
 289    exit 1
 290 fi
 291
 292 while [ $# -gt 0 ]; do
 293     opt="$1"
 294     shift
 295     case "$opt" in
 296     -h|--help)
 297         usage
 298         exit 0
 299         ;;
 300     -n|--name)
 301         optarg_check $opt "$1"
 302         name=$1
 303         shift
 304         ;;
 305     --rootfs)
 306         optarg_check $opt "$1"
 307         rootfs=$1
 308         shift
 309         ;;
 310     -p|--path)
 311         optarg_check $opt "$1"
 312         path=$1
 313         shift
 314         ;;
 315     -r|--repository)
 316         optarg_check $opt "$1"
 317         repository=$1
 318         shift
 319         ;;
 320     -R|--release)
 321         optarg_check $opt "$1"
 322         release=$1
 323         shift
 324         ;;
 325     -a|--arch)
 326         optarg_check $opt "$1"
 327         arch=$1
 328         shift
 329         ;;
 330     --)
 331         break;;
 332     --*=*)
 333         # split --myopt=foo=bar into --myopt foo=bar
 334         set -- ${opt%=*} ${opt#*=} "$@"
 335         ;;
 336     -?)
 337         usage_err "unknown option '$opt'"
 338         ;;
 339     -*)
 340         # split opts -abc into -a -b -c
 341         set -- $(echo "${opt#-}" | sed 's/\(.\)/ -\1/g') "$@"
 342         ;;
 343     esac
 344 done
 345
 346
 347 [ -z "$name" ] && usage_err
 348
 349 if [ -z "${path}" ]; then
 350     path="${default_path}/${name}"
 351 fi
 352
 353 if [ -z "$rootfs" ]; then
 354     rootfs=`awk -F= '$1 ~ /^lxc.rootfs/ { print $2 }' "$path/config" 2>/dev/null`
 355     if [ -z "$rootfs" ]; then
 356         rootfs="${path}/rootfs"
 357     fi
 358 fi
 359
 360 lxc_arch=$arch
 361 apk_arch=$arch
 362
 363 case "$arch" in
 364     i[3-6]86)
 365         apk_arch=x86
 366         lxc_arch=x86
 367         ;;
 368     x86)
 369         lxc_arch=i686
 370         ;;
 371     x86_64|"")
 372         ;;
 373     arm*)
 374         apk_arch=armhf
 375         ;;
 376     *)
 377         die "unsupported architecture: $arch"
 378         ;;
 379 esac
 380
 381 : ${APK:=apk}
 382 if ! which $APK >/dev/null; then
 383     get_static_apk "$rootfs" || die "Failed to download a valid static apk"
 384 fi
 385
 386 install_alpine "$rootfs" "$@" || die "Failed to install rootfs for $name"
 387 configure_alpine "$rootfs" "$name" || die "Failed to configure $name"
 388 copy_configuration "$path" "$rootfs" "$name"