Alpine updates

- use current dir as working dir
- add network config
- add hostname

alpine-rebuild-initramfs.sh

@@ -9,7 +9,7 @@ IMAGE=alpine-minirootfs-$MAJOR_VERSION.$MINOR_VERSION-x86_64.tar.gz
 SSH_KEYS=$(cat ~/.ssh/id_rsa.pub)
 RESOLVCONF=/etc/resolv.conf
 
-working_directory=$(dirname $0)
+working_directory=$(pwd -P)
 rootfs_tmpdir=$(mktemp -d)
 rootfs_url="http://dl-cdn.alpinelinux.org/alpine/v$MAJOR_VERSION/releases/x86_64/$IMAGE"
 
@@ -40,12 +40,26 @@ cat $RESOLVCONF > $rootfs_tmpdir/etc/resolv.conf
 # Make sure init is found by the kernel.
 run_root ln -s /sbin/init /init
 
+cat > $rootfs_tmpdir/etc/network/interfaces <<EOF
+auto lo
+iface lo inet loopback
+
+auto eth0
+iface eth0 inet6 auto
+    post-up ip addr show dev eth0 | grep inet6 | tee -a /etc/issue
+EOF
+
+cat > $rootfs_tmpdir/etc/hostname <<EOF
+alpine-unconfigured
+EOF
+
 # Layer atop base rootfs.
 run_root apk update
 run_root apk upgrade
 run_root apk add openssh linux-vanilla openrc udev
 run_root rc-update add udev
 run_root rc-update add sshd
+run_root rc-update add networking
 
 # Generate iniramfs image
 (cd $rootfs_tmpdir; find . | cpio -H newc -o | gzip -9 > "$working_directory/alpine-initramfs.gz")