configs/*/grub/grub.cfg: search for a .uuid file in /.disk/ and use the volume it's on

Search for `/.disk/%UUID_SEARCH_FILENAME%.uuid` and pass the UUID of the
volume it's on as `archisodevice`. mkarchiso will replace
`%UUID_SEARCH_FILENAME%` with a hardcoded value generated using
`SOURCE_DATE_EPOCH` durring ISO build.

This allows to prepare an UEFI bootable installation medium by simply
copying the directory structure without having to touch `grub.cfg`.

Relying on the volume UUID instead of its LABEL also avoids collisions
of multiple ISOs created in the same month.

Fixes #202

1 files changed, 7 insertions, 0 deletions

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 66ffe75..f6a6f25 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -8,9 +8,16 @@ Changelog
 Added
 -----
 
+- Support *file system transposition* to simplify boot medium preparation for UEFI boot via extracting the ISO image
+  contents to a drive. ``grub.cfg`` does not hardcode the ISO volume label anymore, instead GRUB will search for volume
+  with a ``/.disk/%UUID_SEARCH_FILENAME%.uuid`` file on it.
+
 Changed
 -------
 
+- Identify the ISO volume via a UUID instead of a file system label to avoid collisions of multiple ISOs created in the
+  same month.
+
 Removed
 -------