fedup-dracut - initramfs environment for Fedora Upgrades

This is fedup-dracut, the initramfs environment for Fedora Upgrades.

Components

It has the following parts:

90system-upgrade/

This module provides a (distro-neutral) framework for running upgrades.

• Adds three dracut hooks: upgrade-pre, upgrade, and upgrade-post.

• Adds upgrade.target, which runs the above hooks (in order)

• Automatically includes any other modules named system-upgrade-*

• BONUS: adds system-upgrade-shell.service

85system-upgrade-fedora/

This is the Fedora system-upgrade implementation.

• Includes upgrade tool, SELinux policy, plymouth, etc.

• Copies initramfs to $NEWROOT/system-upgrade-root

• Runs system-upgrade-fedora binary in the upgrade hook

• Save log & journal to /var/log/upgrade.{log,journal} before reboot

system-upgrade-fedora.c

The actual upgrade tool.

• Upgrades system using packages from $UPGRADELINK

• Sends progress updates to plymouthd

• Sends status output to console + journal

The actual upgrade setup is handled in the main fedup package, which can be found here: https://github.com/wgwoods/fedup

Building

You’ll want to build the initramfs on the newer distro version.

1. Install build requirements

   • rpm-devel >= 4.10.0

   • plymouth-devel >= 0.8.6

   • systemd >= 195

   • glib2-devel

2. Install dracut modules

   • make install, or

     1. make archive

     2. rpmbuild -ta fedup-dracut*.tar.xz

     3. rpm -ivh [freshly-built RPMs]

3. Build upgrade initramfs

   • OLDTHEME=$(plymouth-set-default-theme)

   • plymouth-set-default-theme fedup

   • dracut --add system-upgrade upgrade.img

   • plymouth-set-default-theme $OLDTHEME