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67 lines
2.1 KiB
67 lines
2.1 KiB
7 years ago
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powerel-upgrade-dracut - initramfs environment for PEL Upgrades
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================================================================
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Toshaan Bharvani <toshaan@vantosh.com>
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This is 'powerel-upgrade-dracut', the initramfs environment for PEL Upgrades.
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This tool is forked from/based upon 'redhat-upgrade-dracut' with original
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author Will Woods <wwoods@redhat.com>
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Components
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----------
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It has the following parts:
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`90system-upgrade/`
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~~~~~~~~~~~~~~~~~~~
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This module provides a (distro-neutral) framework for running upgrades.
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* Adds three dracut hooks: `upgrade-pre`, `upgrade`, and `upgrade-post`.
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* Adds `upgrade.target`, which runs the above hooks (in order)
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* Automatically includes any other modules named `system-upgrade-*`
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* 'BONUS:' adds system-upgrade-shell.service
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`85system-upgrade-powerel/`
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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This is the PEL 'system-upgrade' implementation.
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* Includes upgrade tool, SELinux policy, plymouth, etc.
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* Copies initramfs to `$NEWROOT/system-upgrade-root`
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* Runs 'system-upgrade-powerel' binary in the `upgrade` hook
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* Save log & journal to `/var/log/upgrade.{log,journal}` before reboot
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`system-upgrade-powerel.c`
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~~~~~~~~~~~~~~~~~~~~~~~~~
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The actual upgrade tool.
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* Upgrades system using packages from `$UPGRADELINK`
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* Sends progress updates to `plymouthd`
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* Sends status output to console + journal
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The actual upgrade setup is handled in the main 'powerel-upgrade-tool' package.
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Based upon the 'redhat-upgrade-tool', which can be found here:
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https://github.com/dashea/powerel-upgrade-tool
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Building
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--------
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You'll want to build the initramfs on the _newer_ distro version.
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. Install build requirements
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* 'rpm-devel' >= 4.10.0
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* 'plymouth-devel' >= 0.8.6
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* 'systemd' >= 195
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* 'glib2-devel'
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. Install dracut modules
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* `make install`, or
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.. `make archive`
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.. `rpmbuild -ta redhat-upgrade-dracut*.tar.xz`
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.. +rpm -ivh '[freshly-built RPMs]'+
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. Build upgrade initramfs
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* `OLDTHEME=$(plymouth-set-default-theme)`
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* `plymouth-set-default-theme powerel-upgrade-tool`
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* `dracut --add system-upgrade upgrade.img`
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* `plymouth-set-default-theme $OLDTHEME`
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// vim: set syn=asciidoc tw=78:
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