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mkarchiso: add version information

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To date the iso version was used for iso volume information and iso file name.
In my custom builds I do use it a lot more:

* Inside the root fs: The system knows about its own version. I use this to:
  -> report the version to a server (poor man's inventory)
  -> let the system update itself

* On the iso fs: The files are served via rsync, running systems transfer
  version file first to check for available update.

* A grub environment file on the iso fs: Booting the iso from grub allows
  to create cow directory per version:

    loopback loop archlinux.iso
    load_env -f (loop)/arch/grubenv
    linux (loop)/arch/boot/x86_64/vmlinuz-linux ... \
        cow_directory=archlinux/${VERSION} ...

So let's just create these files.
This commit is contained in:
Christian Hesse 2021-01-06 11:59:53 +01:00
parent d153b48613
commit b30d1cad9b
2 changed files with 23 additions and 1 deletions
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README.rst
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@ -118,6 +118,19 @@ Optionally install archiso's mkinitcpio hooks:
make install-initcpio
Optional Features
=================
The iso image contains a grub environment block holding the iso version. This allows to boot the iso image from grub
with a version specific cow directory to mitigate overlay clashes.
.. code:: grub
loopback loop archlinux.iso
load_env -f (loop)/arch/grubenv
linux (loop)/arch/boot/x86_64/vmlinuz-linux ... \
cow_directory=archlinux/${VERSION} ...
initrd (loop)/arch/boot/x86_64/initramfs-linux-lts.img
Contribute
==========