configs/: replace archisodevice boot parameter with archisosearchuuid

`archisosearchuuid=` first searches for a matching UUID. If that fails,
then it mounts and looks for a `/boot/${archisosearchuuid}.uuid` file in
all detected block devices (in whatever order `blkid` lists them).

This implements "file system transposition" without relaying on boot
loader specific features and does not tie us to GRUB anymore.

Related to https://gitlab.archlinux.org/archlinux/mkinitcpio/mkinitcpio-archiso/-/merge_requests/48
Fixes https://gitlab.archlinux.org/archlinux/archiso/-/issues/217

CHANGELOG.rst

@@ -17,6 +17,8 @@ Changed
 - Change releng profile's bootstrap tarball compression from gzip to zstd. zstd provides higher and faster compression.
 - Use mkinitcpio's ``microcode`` hook instead of external microcode images to simplify boot loader configuration.
   Custom PXE setups will need to update their boot loader configuration.
+- Replace ``archisodevice`` boot parameter with ``archisosearchuuid`` in all boot loader configuration. This allows to
+  have "file system transposition" without relaying on GRUB-specific features.
 
 Deprecated
 ----------

configs/baseline/efiboot/loader/entries/01-archiso-x86_64-linux.conf

@@ -1,4 +1,4 @@
 title   Arch Linux (x86_64, UEFI)
 linux   /%INSTALL_DIR%/boot/x86_64/vmlinuz-linux
 initrd  /%INSTALL_DIR%/boot/x86_64/initramfs-linux.img
-options archisobasedir=%INSTALL_DIR% archisodevice=UUID=%ARCHISO_UUID%
+options archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID%

configs/baseline/grub/grub.cfg

@@ -27,15 +27,6 @@ if serial --unit=0 --speed=115200; then
     terminal_output --append serial
 fi
 
-# Search for the ISO volume
-if [ -z "${ARCHISO_UUID}" ]; then
-    if [ -z "${ARCHISO_HINT}" ]; then
-        regexp --set=1:ARCHISO_HINT '^\(([^)]+)\)' "${cmdpath}"
-    fi
-    search --no-floppy --set=root --file '%ARCHISO_SEARCH_FILENAME%' --hint "${ARCHISO_HINT}"
-    probe --set ARCHISO_UUID --fs-uuid "${root}"
-fi
-
 # Get a human readable platform identifier
 if [ "${grub_platform}" == 'efi' ]; then
     archiso_platform='UEFI'
@@ -62,7 +53,7 @@ timeout_style=menu
 
 menuentry "Arch Linux (%ARCH%, ${archiso_platform})" --class arch --class gnu-linux --class gnu --class os --id 'archlinux' {
     set gfxpayload=keep
-    linux /%INSTALL_DIR%/boot/%ARCH%/vmlinuz-linux archisobasedir=%INSTALL_DIR% archisodevice=UUID=${ARCHISO_UUID}
+    linux /%INSTALL_DIR%/boot/%ARCH%/vmlinuz-linux archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID%
     initrd /%INSTALL_DIR%/boot/%ARCH%/initramfs-linux.img
 }
 

configs/baseline/syslinux/syslinux-linux.cfg

@@ -2,4 +2,4 @@ LABEL arch
 MENU LABEL Arch Linux (x86_64, BIOS)
 LINUX /%INSTALL_DIR%/boot/%ARCH%/vmlinuz-linux
 INITRD /%INSTALL_DIR%/boot/%ARCH%/initramfs-linux.img
-APPEND archisobasedir=%INSTALL_DIR% archisodevice=UUID=%ARCHISO_UUID%
+APPEND archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID%

configs/releng/efiboot/loader/entries/01-archiso-x86_64-linux.conf

@@ -2,4 +2,4 @@ title    Arch Linux install medium (x86_64, UEFI)
 sort-key 01
 linux    /%INSTALL_DIR%/boot/x86_64/vmlinuz-linux
 initrd   /%INSTALL_DIR%/boot/x86_64/initramfs-linux.img
-options  archisobasedir=%INSTALL_DIR% archisodevice=UUID=%ARCHISO_UUID%
+options  archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID%

configs/releng/efiboot/loader/entries/02-archiso-x86_64-speech-linux.conf

@@ -2,4 +2,4 @@ title    Arch Linux install medium (x86_64, UEFI) with speech
 sort-key 02
 linux    /%INSTALL_DIR%/boot/x86_64/vmlinuz-linux
 initrd   /%INSTALL_DIR%/boot/x86_64/initramfs-linux.img
-options  archisobasedir=%INSTALL_DIR% archisodevice=UUID=%ARCHISO_UUID% accessibility=on
+options  archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID% accessibility=on

configs/releng/grub/grub.cfg

@@ -27,15 +27,6 @@ if serial --unit=0 --speed=115200; then
     terminal_output --append serial
 fi
 
-# Search for the ISO volume
-if [ -z "${ARCHISO_UUID}" ]; then
-    if [ -z "${ARCHISO_HINT}" ]; then
-        regexp --set=1:ARCHISO_HINT '^\(([^)]+)\)' "${cmdpath}"
-    fi
-    search --no-floppy --set=root --file '%ARCHISO_SEARCH_FILENAME%' --hint "${ARCHISO_HINT}"
-    probe --set ARCHISO_UUID --fs-uuid "${root}"
-fi
-
 # Get a human readable platform identifier
 if [ "${grub_platform}" == 'efi' ]; then
     archiso_platform='UEFI'
@@ -62,13 +53,13 @@ timeout_style=menu
 
 menuentry "Arch Linux install medium (%ARCH%, ${archiso_platform})" --class arch --class gnu-linux --class gnu --class os --id 'archlinux' {
     set gfxpayload=keep
-    linux /%INSTALL_DIR%/boot/%ARCH%/vmlinuz-linux archisobasedir=%INSTALL_DIR% archisodevice=UUID=${ARCHISO_UUID}
+    linux /%INSTALL_DIR%/boot/%ARCH%/vmlinuz-linux archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID%
     initrd /%INSTALL_DIR%/boot/%ARCH%/initramfs-linux.img
 }
 
 menuentry "Arch Linux install medium with speakup screen reader (%ARCH%, ${archiso_platform})" --hotkey s --class arch --class gnu-linux --class gnu --class os --id 'archlinux-accessibility' {
     set gfxpayload=keep
-    linux /%INSTALL_DIR%/boot/%ARCH%/vmlinuz-linux archisobasedir=%INSTALL_DIR% archisodevice=UUID=${ARCHISO_UUID} accessibility=on
+    linux /%INSTALL_DIR%/boot/%ARCH%/vmlinuz-linux archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID% accessibility=on
     initrd /%INSTALL_DIR%/boot/%ARCH%/initramfs-linux.img
 }
 

configs/releng/syslinux/archiso_pxe-linux.cfg

@@ -6,7 +6,7 @@ ENDTEXT
 MENU LABEL Arch Linux install medium (x86_64, NBD)
 LINUX ::/%INSTALL_DIR%/boot/x86_64/vmlinuz-linux
 INITRD ::/%INSTALL_DIR%/boot/x86_64/initramfs-linux.img
-APPEND archisobasedir=%INSTALL_DIR% archisodevice=UUID=%ARCHISO_UUID% archiso_nbd_srv=${pxeserver} cms_verify=y
+APPEND archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID% archiso_nbd_srv=${pxeserver} cms_verify=y
 SYSAPPEND 3
 
 LABEL arch64_nfs

configs/releng/syslinux/archiso_sys-linux.cfg

@@ -6,7 +6,7 @@ ENDTEXT
 MENU LABEL Arch Linux install medium (x86_64, BIOS)
 LINUX /%INSTALL_DIR%/boot/x86_64/vmlinuz-linux
 INITRD /%INSTALL_DIR%/boot/x86_64/initramfs-linux.img
-APPEND archisobasedir=%INSTALL_DIR% archisodevice=UUID=%ARCHISO_UUID%
+APPEND archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID%
 
 # Accessibility boot option
 LABEL arch64speech
@@ -17,4 +17,4 @@ ENDTEXT
 MENU LABEL Arch Linux install medium (x86_64, BIOS) with ^speech
 LINUX /%INSTALL_DIR%/boot/x86_64/vmlinuz-linux
 INITRD /%INSTALL_DIR%/boot/x86_64/initramfs-linux.img
-APPEND archisobasedir=%INSTALL_DIR% archisodevice=UUID=%ARCHISO_UUID% accessibility=on
+APPEND archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID% accessibility=on