Containerfile

# Install and run a dracut module
FROM quay.io/fedora/fedora-coreos:stable

# Install dracut module requirements
RUN rpm-ostree install busybox rng-tools pcsc-tools bluez && \
    ostree container commit

# Add dracut module files
COPY files/ /usr/lib/dracut/modules.d/10systemd-echo-here/

# Run dracut to build a new initrd
RUN export KERNEL_VERSION="$(rpm -qa kernel --queryformat '%{VERSION}-%{RELEASE}.%{ARCH}')" && \
    stock_arguments=$(lsinitrd "/lib/modules/${KERNEL_VERSION}/initramfs.img"  | grep '^Arguments: ' | sed 's/^Arguments: //') && \
    mkdir -p /tmp/dracut /var/roothome && \
    bash <(/usr/bin/echo "dracut $stock_arguments") && \
    rm -rf /var/* /tmp/*  && \
    ostree container commit

# Move the new initrd into place while keeping the stock initrd in the image for reference.
RUN export KERNEL_VERSION="$(rpm -qa kernel --queryformat '%{VERSION}-%{RELEASE}.%{ARCH}')" && \
    mv -v "/lib/modules/${KERNEL_VERSION}/initramfs.img" "/lib/modules/${KERNEL_VERSION}/initramfs.stock.img" && \
    mv -v /boot/initramfs*.img "/lib/modules/${KERNEL_VERSION}/initramfs.img" && \
    ostree container commit

# Show that the initrd includes the echo-here service:
RUN lsinitrd /lib/modules/*/initramfs.img | grep echo-here