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path: root/main/lxc/alpine-template-backport.patch
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diff --git a/templates/lxc-alpine.in b/templates/lxc-alpine.in
index 962d274..ce7226f 100644
--- a/templates/lxc-alpine.in
+++ b/templates/lxc-alpine.in
@@ -1,20 +1,99 @@
 #!/bin/sh
 
+key_sha256sums="9c102bcc376af1498d549b77bdbfa815ae86faa1d2d82f040e616b18ef2df2d4  alpine-devel@lists.alpinelinux.org-4a6a0840.rsa.pub
+2adcf7ce224f476330b5360ca5edb92fd0bf91c92d83292ed028d7c4e26333ab  alpine-devel@lists.alpinelinux.org-4d07755e.rsa.pub"
+
+get_static_apk () {
+    wget="wget -q -O -"
+    pkglist=alpine-keys:apk-tools-static
+    auto_repo_dir=
+
+    if [ -z "$repository" ]; then
+        url=http://wiki.alpinelinux.org/cgi-bin/dl.cgi
+        if [ -z "$release" ]; then
+            echo -n "Determining the latest release... "
+            release=$($wget $url/.latest.$apk_arch.txt | \
+                cut -d " " -f 3 | cut -d / -f 1 | uniq)
+            if [ -z "$release" ]; then
+                echo failed
+                return 1
+            fi
+            echo $release
+        fi
+        auto_repo_dir=$release/main
+        repository=$url/$auto_repo_dir
+        pkglist=$pkglist:alpine-mirrors
+    fi
+
+    rootfs="$1"
+    echo "Using static apk from $repository/$apk_arch"
+    wget="$wget $repository/$apk_arch"
+
+    # parse APKINDEX to find the current versions
+    static_pkgs=$($wget/APKINDEX.tar.gz | \
+        tar -Oxz APKINDEX | \
+        awk -F: -v pkglist=$pkglist '
+            BEGIN { split(pkglist,pkg) }
+            $0 != "" { f[$1] = $2 }
+            $0 == "" { for (i in pkg)
+                           if (pkg[i] == f["P"])
+                               print(f["P"] "-" f["V"] ".apk") }')
+    [ "$static_pkgs" ] || return 1
+
+    mkdir -p "$rootfs" || return 1
+    for pkg in $static_pkgs; do
+        echo "Downloading $pkg"
+        $wget/$pkg | tar -xz -C "$rootfs"
+    done
+
+    # clean up .apk meta files
+    rm -f "$rootfs"/.[A-Z]*
+
+    # verify checksum of the key
+    keyname=$(echo $rootfs/sbin/apk.static.*.pub | sed 's/.*\.SIGN\.RSA\.//')
+    checksum=$(echo "$key_sha256sums" |  grep -w "$keyname")
+    if [ -z "$checksum" ]; then
+        echo "ERROR: checksum is missing for $keyname"
+        return 1
+    fi
+    (cd $rootfs/etc/apk/keys && echo "$checksum" | sha256sum -c -) || return 1
+
+    # verify the static apk binary signature
+    APK=$rootfs/sbin/apk.static
+    openssl dgst -verify $rootfs/etc/apk/keys/$keyname \
+        -signature "$APK.SIGN.RSA.$keyname" "$APK" || return 1
+
+    if [ "$auto_repo_dir" ]; then
+        mirror_list=$rootfs/usr/share/alpine-mirrors/MIRRORS.txt
+        mirror_count=$(wc -l $mirror_list | cut -d " " -f 1)
+        repository=$(sed $(expr $RANDOM % $mirror_count + 1)\!d \
+            $mirror_list)$auto_repo_dir
+        echo "Selecting mirror $repository"
+    fi
+}
+
 install_alpine() {
     rootfs="$1"
     shift
     mkdir -p "$rootfs"/etc/apk || return 1
-    cp -r ${keys_dir:-/etc/apk/keys} "$rootfs"/etc/apk/
+    : ${keys_dir:=/etc/apk/keys}
+    if ! [ -d "$rootfs"/etc/apk/keys ] && [ -d "$keys_dir" ]; then
+        cp -r "$keys_dir" "$rootfs"/etc/apk/keys
+    fi
     if [ -n "$repository" ]; then
         echo "$repository" > "$rootfs"/etc/apk/repositories
     else
         cp /etc/apk/repositories "$rootfs"/etc/apk/repositories || return 1
+        if [ -n "$release" ]; then
+            sed -i -e "s:/[^/]\+/\([^/]\+\)$:/$release/\1:" \
+                "$rootfs"/etc/apk/repositories
+        fi
     fi
     opt_arch=
     if [ -n "$apk_arch" ]; then
         opt_arch="--arch $apk_arch"
     fi
-    ${APK:-apk} add -U --initdb --root $rootfs $opt_arch "$@" alpine-base
+    $APK add -U --initdb --root $rootfs $opt_arch "$@" alpine-base
 }
 
 configure_alpine() {
@@ -109,6 +188,7 @@ EOF
 lxc.tty = 4
 lxc.pts = 1024
 lxc.utsname = $hostname
+lxc.cap.drop = sys_module mac_admin mac_override sys_time
 
 # When using LXC with apparmor, uncomment the next line to run unconfined:
 #lxc.aa_profile = unconfined
@@ -129,7 +209,7 @@ lxc.cgroup.devices.allow = c 1:8 rwm
 lxc.cgroup.devices.allow = c 136:* rwm
 lxc.cgroup.devices.allow = c 5:2 rwm
 # rtc
-lxc.cgroup.devices.allow = c 254:0 rwm
+lxc.cgroup.devices.allow = c 254:0 rm
 
 # mounts point
 lxc.mount.entry=proc proc proc nodev,noexec,nosuid 0 0
@@ -148,8 +228,10 @@ die() {
 
 usage() {
     cat >&2 <<EOF
-Usage: $(basename $0) [-h|--help] [-r|--repository <url>] [-a|--arch <arch>]
-                   -p|--path <path> -n|--name <name> [PKG...]
+Usage: $(basename $0) [-h|--help] [-r|--repository <url>]
+                   [-R|--release <release>] [-a|--arch <arch>]
+                   [--rootfs <rootfs>] -p|--path <path> -n|--name <name>
+                   [PKG...]
 EOF
 }
 
@@ -165,6 +247,14 @@ optarg_check() {
 }
 
 default_path=@LXCPATH@
+release=
+arch=$(uname -m)
+
+# template mknods, requires root
+if [ $(id -u) -ne 0 ]; then
+   echo "$(basename $0): must be run as root" >&2
+   exit 1
+fi
 
 while [ $# -gt 0 ]; do
     opt="$1"
@@ -179,6 +269,11 @@ while [ $# -gt 0 ]; do
         name=$1
         shift
         ;;
+    --rootfs)
+        optarg_check $opt "$1"
+        rootfs=$1
+        shift
+        ;;
     -p|--path)
         optarg_check $opt "$1"
         path=$1
@@ -189,6 +284,11 @@ while [ $# -gt 0 ]; do
         repository=$1
         shift
 	;;
+    -R|--release)
+        optarg_check $opt "$1"
+        release=$1
+        shift
+        ;;
     -a|--arch)
         optarg_check $opt "$1"
         arch=$1
@@ -217,9 +317,11 @@ if [ -z "${path}" ]; then
     path="${default_path}/${name}"
 fi
 
-rootfs=`awk -F= '$1 ~ /^lxc.rootfs/ { print $2 }' "$path/config" 2>/dev/null`
 if [ -z "$rootfs" ]; then
-    rootfs="${path}/rootfs"
+    rootfs=`awk -F= '$1 ~ /^lxc.rootfs/ { print $2 }' "$path/config" 2>/dev/null`
+    if [ -z "$rootfs" ]; then
+        rootfs="${path}/rootfs"
+    fi
 fi
 
 lxc_arch=$arch
@@ -234,6 +336,11 @@ case "$arch" in
 	*)	die "unsupported architecture: $arch";;
 esac
 
+: ${APK:=apk}
+if ! which $APK >/dev/null; then
+    get_static_apk "$rootfs" || die "Failed to download a valid static apk"
+fi
+
 install_alpine "$rootfs" "$@" || die "Failed to install rootfs for $name"
 configure_alpine "$rootfs" "$name" || die "Failed to configure $name"
 copy_configuration "$path" "$rootfs" "$name"